This paper considers the problem of power allocation between the two senders in the multiple access
channel. Two power allocation criteria are developed. In particular, in the first criterion, the total
available power is allocated between the two users such that the two users have the same achievable rate.
In addition, the second criterion allocates the total available power such that the sum rate is maximized. In
addition, many numerical examples are shown to show the value of power allocation and also to compare
between the proposed criteria.
OPTIMAL POWER ALLOCATION FOR MULTIPLE ACCESS CHANNELijwmn
This paper considers the problem of power allocation between the two senders in the multiple access channel. Two power allocation criteria are developed. In particular, in the first criterion, the total available power is allocated between the two users such that the two users have the same achievable rate.
In addition, the second criterion allocates the total available power such that the sum rate is maximized. In addition, many numerical examples are shown to show the value of power allocation and also to compare between the proposed criteria
Performance of cluster-based cognitive multihop networks under joint impact o...TELKOMNIKA JOURNAL
In this paper, we evaluate outage probability (OP) of a cluster-based multi-hop protocol operating
on an underlay cognitive radio (CR) mode. The primary network consists of multiple independent
transmit/receive pairs, and the primary transmitters seriously cause co-channel interference (CCI) to the
secondary receivers. To improve the outage performance for the secondary network under the joint impact
of the CCI and hardware imperfection, we employ the best relay selection at each hop. Moreover, the
destination is equipped with multiple antennas and uses the selection combining (SC) technique to
enhance the reliability of the data transmission at the last hop. For performance evaluation, we first derive
an exact formula of OP for the primary network which is used to calculate the transmit power of the
secondary transmitters. Next, an exact closed-form expression of the end-to-end OP for the secondary
network is derived over Rayleigh fading channels. We then perform Monte-Carlo simulations to validate
the derivations. The results present that the CCI caused by the primary operations significantly impacts on
the outage performance of the secondary network.
Joint impacts of relaying scheme and wireless power transfer in multiple acce...journalBEEI
This paper considers ergodic capacity of energy harvesting (EH) based cellular networks. Such a network employs non-orthogonal multiple access (NOMA) together with relaying scheme to serve two far users. In this system model, relay is facilitated power splitting (PS) protocol to implement energy harvesting (EH). To examine capacity, expressions of signal to noise ratio (SNR) need be computed to achieve capacity. Power allocation factors are different for two users in such system and hence performance gap happens to distinguish requirements for separated users. It can be confirmed that the proposed paradigm exhibits maximal achievable capacity in some scenarios of setting parameters. To confirm exactness of the analytical expressions and show advantages of the proposed EH-NOMA, simulation results are performed in terms of ergodic capacity.
Exact Outage Performance Analysis of Amplify-and-forward-aware Cooperative NOMATELKOMNIKA JOURNAL
In this paper, new radio access scheme that combines Amplify-and-Forward (AF) relaying protocol and non-orthogonal multiple access (NOMA) system is introduced. In particular, different scenarios for fixed power allocation scheme is investigated. In addition, the outage probability of both weak and strong user is derived and provided in closed-form expressions. Such outage is investigated in high SNR scenario and comparison performance between these NOMA scenarios is introduced. Numerical simulations are offered to clarify the outage performance of the considered scheme if varying several parameters in the existing schemes to verify the derived formulas.
Hybrid Time-power Switching Protocol of Energy Harvesting Bidirectional Relay...TELKOMNIKA JOURNAL
In this paper, we investigate system performance in term of throughput and ergodic capacity of the hybrid time-power switching protocol of energy harvesting bidirectional relaying network. In the first stage, the analytical expression of the system throughput and ergodic capacity of the model system is proposed and derived. In this analysis, both delay-limited and delay-tolerant transmission modes are presented and considered. After that, the effect of various system parameters on the proposed system is investigated and demonstrated by Monte-Carlo simulation. Finally, the results show that the analytical mathematical and simulated results match for all possible parameter values for both schemes.
Distributed Spatial Modulation based Cooperative Diversity Schemeijwmn
: In this paper, a distributed spatial modulation based cooperative diversity scheme for relay
wireless networks is proposed. Where, the space-time block code is exploited to integrate with distributed
spatial modulation. Therefore, the interested transmission scheme achieves high diversity gain. By using
Monte-Carlo simulation based on computer, we showed that our proposed transmission scheme outperforms
state-of-the-art cooperative relaying schemes in terms bit error rate (BER) performance.
Outage and throughput performance of cognitive radio based power domain based...TELKOMNIKA JOURNAL
This paper considers power domain based multiple access (PDMA) in cognitive radio network to serve numerous users who intend to multiple access to core network. In particular, we investigate the effect of signal combination scheme equipped at PDMA end-users as existence of direct link and relay link. This system model using relay scheme provides performance improvement on the outage probability of two PDMA end-users. We first propose a simple scheme of fixed power allocation to PDMA users who exhibit performance gap and fairness. Inspired by PDMA strategy, we then find signal to noise ratio (SNR) to detect separated signal for each user. In addition, the exact expressions of outage probability are derived in assumption that receiver can cancel out the interference completely with successive interference cancellation (SIC). By exploiting theoretical and simulation results, both considered combination schemes (Maximal Ratio Combining (MRC) and Selection Combining (SC) can achieve improved performance of two PDMA users significantly.
COOPERATIVE COMMUNICATIONS COMBINATION DIVERSITY TECHNIQUES AND OPTIMAL POWER...ijaceeejournal
The main task of this article is to focus on the performance of cooperative MIMO relaying in terms of data rate and Power. Furthermore, compare these performances when using Maximum Ratio Combining (MRC) and equal gain combining (EGC).The average SNR improvement of MRC is typically about 5 dB better than with EGC and direct link.The preciseness of the derived closed form expression of optimum power allocation of the DF-based relaying system is demonstrated by simulation results.
OPTIMAL POWER ALLOCATION FOR MULTIPLE ACCESS CHANNELijwmn
This paper considers the problem of power allocation between the two senders in the multiple access channel. Two power allocation criteria are developed. In particular, in the first criterion, the total available power is allocated between the two users such that the two users have the same achievable rate.
In addition, the second criterion allocates the total available power such that the sum rate is maximized. In addition, many numerical examples are shown to show the value of power allocation and also to compare between the proposed criteria
Performance of cluster-based cognitive multihop networks under joint impact o...TELKOMNIKA JOURNAL
In this paper, we evaluate outage probability (OP) of a cluster-based multi-hop protocol operating
on an underlay cognitive radio (CR) mode. The primary network consists of multiple independent
transmit/receive pairs, and the primary transmitters seriously cause co-channel interference (CCI) to the
secondary receivers. To improve the outage performance for the secondary network under the joint impact
of the CCI and hardware imperfection, we employ the best relay selection at each hop. Moreover, the
destination is equipped with multiple antennas and uses the selection combining (SC) technique to
enhance the reliability of the data transmission at the last hop. For performance evaluation, we first derive
an exact formula of OP for the primary network which is used to calculate the transmit power of the
secondary transmitters. Next, an exact closed-form expression of the end-to-end OP for the secondary
network is derived over Rayleigh fading channels. We then perform Monte-Carlo simulations to validate
the derivations. The results present that the CCI caused by the primary operations significantly impacts on
the outage performance of the secondary network.
Joint impacts of relaying scheme and wireless power transfer in multiple acce...journalBEEI
This paper considers ergodic capacity of energy harvesting (EH) based cellular networks. Such a network employs non-orthogonal multiple access (NOMA) together with relaying scheme to serve two far users. In this system model, relay is facilitated power splitting (PS) protocol to implement energy harvesting (EH). To examine capacity, expressions of signal to noise ratio (SNR) need be computed to achieve capacity. Power allocation factors are different for two users in such system and hence performance gap happens to distinguish requirements for separated users. It can be confirmed that the proposed paradigm exhibits maximal achievable capacity in some scenarios of setting parameters. To confirm exactness of the analytical expressions and show advantages of the proposed EH-NOMA, simulation results are performed in terms of ergodic capacity.
Exact Outage Performance Analysis of Amplify-and-forward-aware Cooperative NOMATELKOMNIKA JOURNAL
In this paper, new radio access scheme that combines Amplify-and-Forward (AF) relaying protocol and non-orthogonal multiple access (NOMA) system is introduced. In particular, different scenarios for fixed power allocation scheme is investigated. In addition, the outage probability of both weak and strong user is derived and provided in closed-form expressions. Such outage is investigated in high SNR scenario and comparison performance between these NOMA scenarios is introduced. Numerical simulations are offered to clarify the outage performance of the considered scheme if varying several parameters in the existing schemes to verify the derived formulas.
Hybrid Time-power Switching Protocol of Energy Harvesting Bidirectional Relay...TELKOMNIKA JOURNAL
In this paper, we investigate system performance in term of throughput and ergodic capacity of the hybrid time-power switching protocol of energy harvesting bidirectional relaying network. In the first stage, the analytical expression of the system throughput and ergodic capacity of the model system is proposed and derived. In this analysis, both delay-limited and delay-tolerant transmission modes are presented and considered. After that, the effect of various system parameters on the proposed system is investigated and demonstrated by Monte-Carlo simulation. Finally, the results show that the analytical mathematical and simulated results match for all possible parameter values for both schemes.
Distributed Spatial Modulation based Cooperative Diversity Schemeijwmn
: In this paper, a distributed spatial modulation based cooperative diversity scheme for relay
wireless networks is proposed. Where, the space-time block code is exploited to integrate with distributed
spatial modulation. Therefore, the interested transmission scheme achieves high diversity gain. By using
Monte-Carlo simulation based on computer, we showed that our proposed transmission scheme outperforms
state-of-the-art cooperative relaying schemes in terms bit error rate (BER) performance.
Outage and throughput performance of cognitive radio based power domain based...TELKOMNIKA JOURNAL
This paper considers power domain based multiple access (PDMA) in cognitive radio network to serve numerous users who intend to multiple access to core network. In particular, we investigate the effect of signal combination scheme equipped at PDMA end-users as existence of direct link and relay link. This system model using relay scheme provides performance improvement on the outage probability of two PDMA end-users. We first propose a simple scheme of fixed power allocation to PDMA users who exhibit performance gap and fairness. Inspired by PDMA strategy, we then find signal to noise ratio (SNR) to detect separated signal for each user. In addition, the exact expressions of outage probability are derived in assumption that receiver can cancel out the interference completely with successive interference cancellation (SIC). By exploiting theoretical and simulation results, both considered combination schemes (Maximal Ratio Combining (MRC) and Selection Combining (SC) can achieve improved performance of two PDMA users significantly.
COOPERATIVE COMMUNICATIONS COMBINATION DIVERSITY TECHNIQUES AND OPTIMAL POWER...ijaceeejournal
The main task of this article is to focus on the performance of cooperative MIMO relaying in terms of data rate and Power. Furthermore, compare these performances when using Maximum Ratio Combining (MRC) and equal gain combining (EGC).The average SNR improvement of MRC is typically about 5 dB better than with EGC and direct link.The preciseness of the derived closed form expression of optimum power allocation of the DF-based relaying system is demonstrated by simulation results.
Performance analysis for power-splitting energy harvesting based two-way full...TELKOMNIKA JOURNAL
Energy harvesting relay network is considered as the promising solution for a wireless
communication network in our time. In this research, we present and demonstrate the system performance
of the energy harvesting based two-way full-duplex relaying network over Nakagami-m fading
environment. Firstly, we propose the analytical expressions of the achievable throughput and outage
probability of the proposed system. In the second step, the effect of various system parameters on
the system performance is presented and investigated. In the final step, the analytical results are also
demonstrated by Monte-Carlo simulation. The numerical results demonstrated and convinced
the analytical and the simulation results are agreed with each other.
Multiuser MIMO Gaussian Channels: Capacity Region and DualityShristi Pradhan
In this paper, I present the MIMO channel for single user case, discuss the decomposition of MIMO into parallel independent channels, and estimate the MIMO channel capacity. Then, I discuss on computation of capacity region for multiuser MIMO broadcast and multiple access channel and plot capacity regions for two users case. I conclude by showing the duality relationship between the multiple access and broadcast channel and show its significance for numerical standpoint.
Digital Beamforming for Simultaneous Power and Information Transmission in Wi...idescitation
This paper proposes a beamforming algorithm to simultaneously transmit power and information in a wireless system with a multi-antenna transmitter. The system considers a transmitter, an information receiver, and an energy harvesting receiver. The algorithm aims to maximize the energy harvested by the receiver while maintaining the information rate above a threshold. It develops a hybrid algorithm that combines signal steering with power maximization. Simulation results show the hybrid algorithm improves the received signal level and sidelobe level compared to existing approaches. It provides up to a 4.8 times increase in total system energy and a 15% higher mainlobe to sidelobe ratio.
Optimizing location and size of capacitors for power loss reduction in radial...TELKOMNIKA JOURNAL
Power radial distribution systems are increasingly more and more important in transmitting the electric energy from power plants to customers. However, total loss in lines are very high. This issue can be solved by allocating capacitor banks. Determining the suitable allocation and optimal sizing of capacitor banks needs an efficient approach. In this study, the diffusion and update techniques-based algorithm (DUTA) is proposed for such reason. The efficiency of DUTA is inspected on two distribution systems consisting of 15-bus and 33-bus systems with different study cases. The solutions attained by DUTA are competed with recently published methods. As a consequence, the method is more effective than the other methods in terms of the quality of solution.
Tractable computation in outage performance analysis of relay selection NOMATELKOMNIKA JOURNAL
In recent years, using full-duplex (FD) transmission model provides enhanced bandwidth efficiency and improved performance for non-orthogonal multiple access (NOMA) system. However, lack of papers have investigated FD relay together with relay selection issue to improve performance of NOMA system. The problems in power allocation for two NOMA users satisfying fairness as well as relay selection strategy are studied in this paper. By considering the outage performance of proposed scheme with its vital result, general NOMA wireless networks can be developed for future networks due to its improved performance. Simulation results show that the relaying selection scheme can achieve a significant performance improvement by increasing required quantity of relay.
BER Performance of MU-MIMO System using Dirty Paper CodingIJEEE
In this paper Dirty Paper Coding for communication system is implemented. MIMO application that involves devices such as cell phones, pocket PCs require closely spaced antenna, which suffers from mutual coupling among antennas and high spatial correlation for signals. DPC is used for compensating the degradation due to correlation and mutual coupling.
A Threshold Enhancement Technique for Chaotic On-Off Keying SchemeCSCJournals
In this paper, an improvement for Chaotic ON-OFF (COOK) Keying scheme is proposed. The scheme enhances Bit Error Rate (BER) performance of standard COOK by keeping the signal elements at fixed distance from the threshold irrespective of noise power. Each transmitted chaotic segment is added to its flipped version before transmission. This reduces the effect of noise contribution at correlator of the receiver. The proposed system is tested in Additive White Gaussian Noise (AWGN) channel and compared with the standard COOK under different Eb/No levels. A theoretical estimate of BER is derived and compared with the simulation results. Effect of spreading factor increment in the proposed system is studied. Results show that the proposed scheme has a considerable advantage over the standard COOK at similar average bit energy and with higher values of spreading factors.
An analtical analysis of w cdma smart antennamarwaeng
The document analyzes the signal-to-interference-noise ratio (SINR) performance of two beamforming methods, complex conjugate (CC) and direction-of-arrival (DOA), used in Wideband Code Division Multiple Access (W-CDMA) smart antenna systems. It derives analytic SINR evaluation equations for both methods under different channel conditions. The results show that the CC and DOA methods provide the same mean SINR performance but the CC method is more robust to channel estimation errors. Simulation results are presented to verify the analytic performance and robustness analyses.
Enabling relay selection in non-orthogonal multiple access networks: direct a...TELKOMNIKA JOURNAL
In this paper, we consider downlink non-orthogonal multiple access (NOMA) in which the relay selection (RS) scheme is enabled for cooperative networks. In particular, we investigate impact of the number of relays on system performance in term of outage probability. The main factors affecting on cooperative NOMA performance are fixed power allocations coefficients and the number of relay. This paper also indicate performance gap of the outage probabilities among two users the context of NOMA. To exhibit the exactness of derived formula, we match related results between simulation and analytical methods. Numerical results confirms that cooperative NOMA networks benefit from increasing the number of relay.
Performance Analysis of Improved Autonomous Power Control Mac Protocol (IAPCM...pijans
Power Control in Mobile Ad Hoc networks is a critical issue, since nodes are powered by batteries.The
main idea of power control schemes is to use different power levels for RTS/CTS and DATA/ACK. These
schemes may degrade network throughput and reduce energy efficiency of the network. In this paper we
have evaluated the performance of Improved Autonomous Power Control MAC Protocol (IAPCMP),that
allows nodes to dynamically adjust power levels for transmission of DATA/ACK according to the distance
between the transmitter and its neighbors.In IAPCMP power level for transmission of RTS/CTS is also
adjustable. This also used maximum power level for transmitting DATA/ACK periodically to make
neighboring nodes aware about ongoing transmission. The performance of IAPCMP is evaluated through
the metrics namely, packet delivery ratio and rate of energy efficiency.The simulation results show
significant improvement in protocol.
This document describes a method for maximizing the total throughput of a two-way relay network using orthogonal frequency-division multiplexing (OFDM). The method jointly optimizes subcarrier pairing and relay selection by formulating the problem as a maximum weighted bipartite matching problem, which can be solved in polynomial time. Simulation results show that the proposed method increases total throughput compared to benchmark methods, especially as the number of relays increases. The throughput is evaluated for different numbers of subcarriers and relays to analyze the system's performance under various conditions.
Joint Fixed Power Allocation and Partial Relay Selection Schemes for Cooperat...TELKOMNIKA JOURNAL
In the future wireless systems, non-orthogonal multiple-access (NOMA) with partial relay selection scheme is considered as developing research topic. In this paper, dual-hop relaying systems is deployed for NOMA, in which the signals are communicated with the assistance of decode-and-forward (DF) scheme. This paper presents exact expressions for outage probability over independent Rayleigh fading channels, and two partial relay selection schemes are provided. Using analytical result and Monte-Carlo method, we introduce forwarding strategy selection for fixed user allocation and exactness of derived formula is checked. The presented simulations confirm the the advantage of such proposed NOMA, and the effectiveness of the proposed forwarding strategy.
Channel assignment for throughput maximization in cognitive radio networks Polytechnique Montreal
In this paper, we consider the channel allocation problem for throughput maximization in cognitive radio networks with hardware-constrained secondary users. Specifically, we assume that secondary users exploit spectrum holes on a set of channels where each secondary user can use at most one available channel for communication. We develop two channel assignment algorithms that can efficiently utilize spectrum opportunities on these channels. In the first algorithm, secondary users are assigned distinct sets of channels. We show that this algorithm achieves the maximum throughput limit if the number of channels is sufficiently large. In addition, we propose an overlapping channel assignment algorithm, that can improve the throughput performance compared to the non-overlapping channel assignment algorithm. In addition, we design a distributed MAC protocol for access contention resolution and integrate the derived MAC protocol overhead into the second channel assignment algorithm. Finally, numerical results are presented to validate the theoretical results and illustrate the performance gain due to the overlapping channel assignment algorithm.
This document proposes using a Markov chain model and bipartite graphing to efficiently schedule spectrum in cognitive radio networks. It models the cognitive radio network as a k-connected bipartite graph and uses a Markov chain to represent the state transitions of channels between idle and busy. It then applies the Banker's algorithm to the modeled cognitive radio network to allocate spectrum to users while avoiding deadlock. The proposed approach indicates it could improve spectrum scheduling and allocation performance in cognitive radio networks.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses optimizing bit loading in broadband power line communication networks. It describes using a greedy bit loading technique to maximize the raw bit rate given available transmission power constraints. The performance of bit loading is analyzed under different system parameters like load conditions, available power, and target error probability. Results show that raw bit rates increase with higher available power and decrease with higher load conditions and lower target error probabilities. Maximum raw bit rates of around 180 Mbps were achieved for the analyzed network model.
This paper proposes and evaluates three algorithms for determining the channel quality of multicast sessions in cellular networks:
1) Algorithm I takes the best channel condition among users as the session's quality. This favors multicast but reduces overall throughput.
2) Algorithm II takes the worst condition, disfavoring multicast.
3) The proposed algorithm takes the average effective throughput per user, balancing multicast and unicast fairness.
The paper simulates these algorithms under varying conditions to evaluate their throughput and fairness between multicast and unicast sessions. The proposed algorithm achieves significantly higher throughput while ensuring fair resource allocation.
Ergodic capacity analysis for underlay cognitive radio systemijmnct
This document summarizes research on the ergodic capacity of an underlay cognitive radio system operating under maximum and average received power constraints at the licensed primary user's receiver. It presents theoretical analysis and numerical simulations. The key findings are:
1) Ergodic capacity decreases as the maximum received power constraint increases or average received power decreases.
2) The optimal transmission cutoff threshold increases as the maximum received power constraint or primary receiver's average received power decreases.
3) For small average received powers, the impact of the maximum received power constraint is negligible. Ergodic capacity increases with average received power up to the maximum received power level, then decreases.
BER Analysis for Downlink MIMO-NOMA Systems over Rayleigh Fading ChannelsIJCNCJournal
The Multiple-input multiple-output (MIMO) technique combined with non-orthogonal multiple access (NOMA) has been considered to enhance total system performance. This paper studies the bit error rate of two-user power-domain NOMA systems using successive interference cancellation receivers, with zeroforcing equalization over quasi-static Rayleigh fading channels. Successive interference cancellation technique at NOMA receivers has been the popular research topic due to its simple implementation, despite its vulnerability to error propagation. Closed-form expressions are derived for downlink NOMA in single-input single-output and uncorrelated quasi-static MIMO Rayleigh fading channel. Analytical results are consolidated with Monte Carlo simulation.
BER ANALYSIS FOR DOWNLINK MIMO-NOMA SYSTEMS OVER RAYLEIGH FADING CHANNELSIJCNCJournal
This document analyzes the bit error rate (BER) of two-user power-domain non-orthogonal multiple access (NOMA) systems using successive interference cancellation receivers over Rayleigh fading channels. It derives closed-form expressions for the BER in single-input single-output and multiple-input multiple-output NOMA systems. The analysis considers two categories of multiuser superposition transmission and verifies the analytical results through Monte Carlo simulation.
Performance analysis for power-splitting energy harvesting based two-way full...TELKOMNIKA JOURNAL
Energy harvesting relay network is considered as the promising solution for a wireless
communication network in our time. In this research, we present and demonstrate the system performance
of the energy harvesting based two-way full-duplex relaying network over Nakagami-m fading
environment. Firstly, we propose the analytical expressions of the achievable throughput and outage
probability of the proposed system. In the second step, the effect of various system parameters on
the system performance is presented and investigated. In the final step, the analytical results are also
demonstrated by Monte-Carlo simulation. The numerical results demonstrated and convinced
the analytical and the simulation results are agreed with each other.
Multiuser MIMO Gaussian Channels: Capacity Region and DualityShristi Pradhan
In this paper, I present the MIMO channel for single user case, discuss the decomposition of MIMO into parallel independent channels, and estimate the MIMO channel capacity. Then, I discuss on computation of capacity region for multiuser MIMO broadcast and multiple access channel and plot capacity regions for two users case. I conclude by showing the duality relationship between the multiple access and broadcast channel and show its significance for numerical standpoint.
Digital Beamforming for Simultaneous Power and Information Transmission in Wi...idescitation
This paper proposes a beamforming algorithm to simultaneously transmit power and information in a wireless system with a multi-antenna transmitter. The system considers a transmitter, an information receiver, and an energy harvesting receiver. The algorithm aims to maximize the energy harvested by the receiver while maintaining the information rate above a threshold. It develops a hybrid algorithm that combines signal steering with power maximization. Simulation results show the hybrid algorithm improves the received signal level and sidelobe level compared to existing approaches. It provides up to a 4.8 times increase in total system energy and a 15% higher mainlobe to sidelobe ratio.
Optimizing location and size of capacitors for power loss reduction in radial...TELKOMNIKA JOURNAL
Power radial distribution systems are increasingly more and more important in transmitting the electric energy from power plants to customers. However, total loss in lines are very high. This issue can be solved by allocating capacitor banks. Determining the suitable allocation and optimal sizing of capacitor banks needs an efficient approach. In this study, the diffusion and update techniques-based algorithm (DUTA) is proposed for such reason. The efficiency of DUTA is inspected on two distribution systems consisting of 15-bus and 33-bus systems with different study cases. The solutions attained by DUTA are competed with recently published methods. As a consequence, the method is more effective than the other methods in terms of the quality of solution.
Tractable computation in outage performance analysis of relay selection NOMATELKOMNIKA JOURNAL
In recent years, using full-duplex (FD) transmission model provides enhanced bandwidth efficiency and improved performance for non-orthogonal multiple access (NOMA) system. However, lack of papers have investigated FD relay together with relay selection issue to improve performance of NOMA system. The problems in power allocation for two NOMA users satisfying fairness as well as relay selection strategy are studied in this paper. By considering the outage performance of proposed scheme with its vital result, general NOMA wireless networks can be developed for future networks due to its improved performance. Simulation results show that the relaying selection scheme can achieve a significant performance improvement by increasing required quantity of relay.
BER Performance of MU-MIMO System using Dirty Paper CodingIJEEE
In this paper Dirty Paper Coding for communication system is implemented. MIMO application that involves devices such as cell phones, pocket PCs require closely spaced antenna, which suffers from mutual coupling among antennas and high spatial correlation for signals. DPC is used for compensating the degradation due to correlation and mutual coupling.
A Threshold Enhancement Technique for Chaotic On-Off Keying SchemeCSCJournals
In this paper, an improvement for Chaotic ON-OFF (COOK) Keying scheme is proposed. The scheme enhances Bit Error Rate (BER) performance of standard COOK by keeping the signal elements at fixed distance from the threshold irrespective of noise power. Each transmitted chaotic segment is added to its flipped version before transmission. This reduces the effect of noise contribution at correlator of the receiver. The proposed system is tested in Additive White Gaussian Noise (AWGN) channel and compared with the standard COOK under different Eb/No levels. A theoretical estimate of BER is derived and compared with the simulation results. Effect of spreading factor increment in the proposed system is studied. Results show that the proposed scheme has a considerable advantage over the standard COOK at similar average bit energy and with higher values of spreading factors.
An analtical analysis of w cdma smart antennamarwaeng
The document analyzes the signal-to-interference-noise ratio (SINR) performance of two beamforming methods, complex conjugate (CC) and direction-of-arrival (DOA), used in Wideband Code Division Multiple Access (W-CDMA) smart antenna systems. It derives analytic SINR evaluation equations for both methods under different channel conditions. The results show that the CC and DOA methods provide the same mean SINR performance but the CC method is more robust to channel estimation errors. Simulation results are presented to verify the analytic performance and robustness analyses.
Enabling relay selection in non-orthogonal multiple access networks: direct a...TELKOMNIKA JOURNAL
In this paper, we consider downlink non-orthogonal multiple access (NOMA) in which the relay selection (RS) scheme is enabled for cooperative networks. In particular, we investigate impact of the number of relays on system performance in term of outage probability. The main factors affecting on cooperative NOMA performance are fixed power allocations coefficients and the number of relay. This paper also indicate performance gap of the outage probabilities among two users the context of NOMA. To exhibit the exactness of derived formula, we match related results between simulation and analytical methods. Numerical results confirms that cooperative NOMA networks benefit from increasing the number of relay.
Performance Analysis of Improved Autonomous Power Control Mac Protocol (IAPCM...pijans
Power Control in Mobile Ad Hoc networks is a critical issue, since nodes are powered by batteries.The
main idea of power control schemes is to use different power levels for RTS/CTS and DATA/ACK. These
schemes may degrade network throughput and reduce energy efficiency of the network. In this paper we
have evaluated the performance of Improved Autonomous Power Control MAC Protocol (IAPCMP),that
allows nodes to dynamically adjust power levels for transmission of DATA/ACK according to the distance
between the transmitter and its neighbors.In IAPCMP power level for transmission of RTS/CTS is also
adjustable. This also used maximum power level for transmitting DATA/ACK periodically to make
neighboring nodes aware about ongoing transmission. The performance of IAPCMP is evaluated through
the metrics namely, packet delivery ratio and rate of energy efficiency.The simulation results show
significant improvement in protocol.
This document describes a method for maximizing the total throughput of a two-way relay network using orthogonal frequency-division multiplexing (OFDM). The method jointly optimizes subcarrier pairing and relay selection by formulating the problem as a maximum weighted bipartite matching problem, which can be solved in polynomial time. Simulation results show that the proposed method increases total throughput compared to benchmark methods, especially as the number of relays increases. The throughput is evaluated for different numbers of subcarriers and relays to analyze the system's performance under various conditions.
Joint Fixed Power Allocation and Partial Relay Selection Schemes for Cooperat...TELKOMNIKA JOURNAL
In the future wireless systems, non-orthogonal multiple-access (NOMA) with partial relay selection scheme is considered as developing research topic. In this paper, dual-hop relaying systems is deployed for NOMA, in which the signals are communicated with the assistance of decode-and-forward (DF) scheme. This paper presents exact expressions for outage probability over independent Rayleigh fading channels, and two partial relay selection schemes are provided. Using analytical result and Monte-Carlo method, we introduce forwarding strategy selection for fixed user allocation and exactness of derived formula is checked. The presented simulations confirm the the advantage of such proposed NOMA, and the effectiveness of the proposed forwarding strategy.
Channel assignment for throughput maximization in cognitive radio networks Polytechnique Montreal
In this paper, we consider the channel allocation problem for throughput maximization in cognitive radio networks with hardware-constrained secondary users. Specifically, we assume that secondary users exploit spectrum holes on a set of channels where each secondary user can use at most one available channel for communication. We develop two channel assignment algorithms that can efficiently utilize spectrum opportunities on these channels. In the first algorithm, secondary users are assigned distinct sets of channels. We show that this algorithm achieves the maximum throughput limit if the number of channels is sufficiently large. In addition, we propose an overlapping channel assignment algorithm, that can improve the throughput performance compared to the non-overlapping channel assignment algorithm. In addition, we design a distributed MAC protocol for access contention resolution and integrate the derived MAC protocol overhead into the second channel assignment algorithm. Finally, numerical results are presented to validate the theoretical results and illustrate the performance gain due to the overlapping channel assignment algorithm.
This document proposes using a Markov chain model and bipartite graphing to efficiently schedule spectrum in cognitive radio networks. It models the cognitive radio network as a k-connected bipartite graph and uses a Markov chain to represent the state transitions of channels between idle and busy. It then applies the Banker's algorithm to the modeled cognitive radio network to allocate spectrum to users while avoiding deadlock. The proposed approach indicates it could improve spectrum scheduling and allocation performance in cognitive radio networks.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses optimizing bit loading in broadband power line communication networks. It describes using a greedy bit loading technique to maximize the raw bit rate given available transmission power constraints. The performance of bit loading is analyzed under different system parameters like load conditions, available power, and target error probability. Results show that raw bit rates increase with higher available power and decrease with higher load conditions and lower target error probabilities. Maximum raw bit rates of around 180 Mbps were achieved for the analyzed network model.
This paper proposes and evaluates three algorithms for determining the channel quality of multicast sessions in cellular networks:
1) Algorithm I takes the best channel condition among users as the session's quality. This favors multicast but reduces overall throughput.
2) Algorithm II takes the worst condition, disfavoring multicast.
3) The proposed algorithm takes the average effective throughput per user, balancing multicast and unicast fairness.
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OPTIMAL POWER ALLOCATION FOR MULTIPLE ACCESS CHANNEL
1. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
DOI: 10.5121/ijwmn.2016.8603 27
OPTIMAL POWER ALLOCATION FOR MULTIPLE
ACCESS CHANNEL
Zouhair Al-qudah
Communication Engineering Department, AL-Hussein bin Talal University,
Ma’an, Jordan
ABSTRACT
This paper considers the problem of power allocation between the two senders in the multiple access
channel. Two power allocation criteria are developed. In particular, in the first criterion, the total
available power is allocated between the two users such that the two users have the same achievable rate.
In addition, the second criterion allocates the total available power such that the sum rate is maximized. In
addition, many numerical examples are shown to show the value of power allocation and also to compare
between the proposed criteria.
KEYWORDS
Multiple Access Channel, Channel Capacity, Optimal Power Allocation.
1. INTRODUCTION
Multiple access channel (MAC) models a communication scenario in which many users want to
communication with a common receiver. For instance, consider many devices want to
communicate with a base station. This communication model were investigated in many different
scenarios. For example, the authors in [1,2] studied the case in which the two senders transmit
independent message signals to the destination. In another scenario, the case in which the two
senders cooperate to transmit a common message was studied in [3,4]. Furthermore, the authors
in [6,7] considered the case in which the destination is affected by a third source, the interferer.
The power allocation problem is an important issue to allocate the total available power among
the users based on the target criterion. For example, some authors like [10]considered the
problem of power allocation problem such that all users have the same data rate. In another
scenario, the authors in [8,9] considered the problem of maximizing the sum rate capacity.
In this paper, the problem of allocating the total available power to the two senders in the basic
Gaussian MAC channel is considered. In particular, two optimization criteria are developed. In
the first optimization problem, the total available power is allocated such that the two senders can
transmit to their destination using the same data rate. In addition, in the second optimization
problem, the total available power is allocated such that the sum rate is maximized. Further,
many numerical examples are shown to support our theoretical results.
The rest of this paper is organized as follows. The system model is introduced in Section 2. Then,
two optimization problems are investigated in Section 3. Finally, the paper is concluded in
Section 3.
2. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
28
2. GAUSSIAN MULTIPLE CHANNEL MODEL AND CAPACITY REGION
The MAC channel models a communication scenario in the case that at least two senders transmit
to a destination, as depicted in Figure 1. Specifically, the first sender wants to transmit a signal
1
X . Simultaneously, the second sender wants to transmit a signal 2
X . These senders transmit
their signal with power constraints 1
P and 2
P , respectively. In addition, The received signal, Y ,
at the destination is given by [1]
Z
bX
aX
Y +
+
= 2
1 (1)
where a and b are the channel gains from the first sender and the second sender to the
destination, respectively. In addition, Z is the additive white Gaussian noise (AWGN)
signal with zero mean and variance normalized to 1. Further, the capacity region for this
channel model is given as[1]
)
(
)
;
,
(
)
(
)
|
;
(
)
(
)
|
;
(
2
2
2
2
1
2
1
2
2
1
2
2
1
2
2
1
1
P
b
P
a
C
Y
X
X
I
R
R
P
b
C
X
Y
X
I
R
P
a
C
X
Y
X
I
R
+
=
≤
+
=
≤
=
≤
(2)
where )
1
(
log
5
.
0
)
( 2 x
x
C +
= bit per second (bps). Moreover, 1
R is the achievable capacity
of the first sender, 2
R is the achievable capacity of the second user. In this capacity region,
for example, the rate )
(
)
|
;
( 1
2
2
1 P
a
C
X
Y
X
I = can be achieved by decoding 2
X at first with
probability goes to zero . Then, the receiver can decode the signal 1
X . In addition,
)
(
)
;
,
( 2
2
2
2
1 P
b
P
a
C
Y
X
X
I +
= represents the sum rate of decoding both 1
X and 2
X at the
destination.
Figure 1. Gaussian Multiple Access Channel.
3. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
29
3. OPTIMAL TRANSMIT POWER ALLOCATION
In this section, two optimal allocation criteria are investigated. In the first criterion, the total
available power is allocated such that the two users have the same rate. In addition, in the second
criterion, the total available power is allocated such that the sum rate is maximized.
3.1. General Optimal Power Allocation with Data Rate Fairness
In this subsection, the available total power is allocated to the two users such that the two users
have the same data rate.
T
P
P
P
R
R
to
Subject
R
=
+
=
2
1
2
1
1
max
(3)
where T
P represents the total available power. Mathematically, we need to
maintain )
(
)
( 2
2
1
2
P
b
C
P
a
C = . This condition yields that
2
2
2
1 P
a
b
P
= (4)
Further, by substituting the value of 1
P from (4) in T
P
P
P =
+ 2
1 , we may get
T
P
b
a
a
P
+
= 2
2
2
2 (5)
and
T
P
b
a
b
P
+
= 2
2
2
1 (6)
Numerically, as shown in Figure 2, more power is allocated to the user which has the weaker
channel gain with the destination. For instance, at given point like 15
=
T
P , more power is
allocated to the second transmitter as the channel gain b decreases. In addition, we note that while
we keep 2
1 R
R = , the sum rate )
(
)
;
,
( 2
2
2
1
2
1 P
b
P
a
C
Y
X
X
I
R
R +
=
≤
+ should be kept.
4. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
30
Figure 2. Power Allocated to the second user Vs. Total available power for different values of the channel
gain, b.
In addition, Figure 3 shows the capacity of the second user as a function of the total available
power for different values of the channel gain, b. We remind that, in this case, both users have the
same capacity. This figure shows that as the total available power increases so does the capacity
of each user. In addition, as the channel gain b increases so does the capacity of the second
user. Remember that as the channel gain b increases, more power will allocated to the other
sender, the first sender.
Figure 3. Capacity of the second user as a function of the total available power for different values of the
channel gain, b.
5. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
31
3.2. Optimal Power Allocation with Sum Rate Maximization.
In this subsection, the total available power is divided between the two senders such that the sum
rate ( 2
1 R
R + ) is maximized. This optimization problem can be modelled as
T
P
P
P
to
Subject
R
R
=
+
+
2
1
2
1
max
(7)
In maximizing )
( 2
2
2
2
1 P
b
P
a
C
R
R +
≤
+ , it is enough to maximize 2
2
1
2
P
b
P
a
J +
= . By
substituting the value of 2
P from T
P
P
P =
+ 2
1 . Thus, we may get T
P
b
P
b
a
J 2
1
2
2
)
( +
−
= .
Further, we derive J with respect to 1
P . Therefore, J gets its maximum for values like
b
a = . In this case, we may have }
{ T
P
b
a
J 2
2
,
max
= . This means that the total power is
allocated to the user which has the stronger channel gain with the destination.
Figure 4. shows the achievable capacity of the second user as a function of T
P for different
values of the channel gains a and b. It clearly shows that the total available power is
allocated to the second sender once the channel gain from the second sender to the
destination is greater than the channel gain between the first user and the destination, and
vice-versa.
Figure 5. compares the achievable capacity when different power allocation criteria are
used. This figure clearly shows larger achievable capacity can be obtained in the case that
the criterion is to maximize the sum rate. However, this option is not optimal since only
one user can use the total available power.
Figure 4. Capacity of the second user as a function of the total available power for different values of the
channel gain, b.
6. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
32
Figure 5. Comparison between the achievable capacity of the second user when different power allocation
criteria are used.
3. CONCLUSIONS
In this paper, the problem of allocating the total available power between the two senders forming
the MAC is investigated. In particular, two criteria are investigated. In the first criterion, the total
power is allocated such that the two users have the same data rate. In the second criterion, the
available power is allocated to maximize the sum rate. In this case, the total power has been
proved to be allocated to the user with stronger channel gain with the destination. Finally, many
numerical examples have been the illustrate the importance of power allocation.
REFERENCES
[1] T. Cover & J. Thomas, (2006), Elements of Information Theory, 2nd Edition, Wiley.
[2] S. Shamai & A. Wyner, (1997),“Information-theoretic considerations for symmetric, cellular,
multiple-access fading channels. I, ” IEEE Trans. Inf. Theory, vol. 43, no. 6, pp. 1877-1894.
[3] H. Asnani, & H. Permuter,(2013) “Multiple-Access Channel With Partial and Controlled Cribbing
Encoders”, IEEE Trans. Inf. Theory ,Vol. 59, No. 4.
[4] D. Chatterjee & T. Wong,“Active user Cooperation in Fading Multiple-Access Channels”, IEEE-
MILCOM, 2008.
[5] O. Kaya & S. Ulukus (2007) , “Power Control for Fading Multiple Access Channels with User
Cooperation”, IEEE Trans. Wireless Communications, Vol 6 , No 8.
[6] O. Kaya & M. İşleyen, (2012),“Power control in the cognitive cooperative multiple access channel,
” 46th Annual Conference on Information Sciences and Systems (CISS), Princeton, NJ.
7. International Journal of Wireless & Mobile Networks (IJWMN) Vol. 8, No. 6, December 2016
33
[7] N. Devroye, P. Mitran & V. Tarokh,(2005), “Cognitive multiple access networks, ”
Proceedings of International Symposium on Information Theory (ISIT). Adelaide, SA.
[8] T. Park, J. Jang, O. Shin & K. Lee,(2005), “Transmit power allocation for a downlink two-user
interference channel, ” IEEE Communications Lett., vol. 9, no. 1. pp 13-16.
[9] H. Joudeh & B. Clerckx,(2016),“Sum-Rate Maximization for Linearly Precoded Downlink
Multiuser MISO Systems With Partial CSIT: A Rate-Splitting Approach, ” IEEE Trans.
Communications, Vol. 64, No. 11, pp. 4847-4861.
[10] M. Pischella & D. Le Ruyet,(2011), “Optimal Power Allocation for the Two-Way Relay Channel
with Data Rate Fairness, ” in IEEE Communications Lett., vol. 15, no. 9, pp. 959-961.