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The document proposes reducing the computational complexity of message passing algorithms like belief propagation (BP) and concave-convex procedure (CCCP) for multiuser detection in CDMA systems. It does this by changing the factor graph structure used to represent the detection problem from a fully connected graph (Factor Graph I) to a sparsely connected graph (Factor Graph II). Simulation results show the proposed CCCP detector for the new factor graph achieves near optimal performance with lower complexity than existing approaches.
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EE402B Radio Systems and Personal Communication Networks notes
EE402B Radio Systems and Personal Communication Networks notes
DESIGN OF DELAY COMPUTATION METHOD FOR CYCLOTOMIC FAST FOURIER TRANSFORM
DESIGN OF DELAY COMPUTATION METHOD FOR CYCLOTOMIC FAST FOURIER TRANSFORM
An Offline Hybrid IGP/MPLS Traffic Engineering Approach under LSP Constraints
An Offline Hybrid IGP/MPLS Traffic Engineering Approach under LSP Constraints
Enhanced Payload Data Reduction Approach for Cluster Head (CH) Nodes
Enhanced Payload Data Reduction Approach for Cluster Head (CH) Nodes
Graph based transistor network generation method for supergate design
Graph based transistor network generation method for supergate design
Energy efficient resources allocations for wireless communication systems
Energy efficient resources allocations for wireless communication systems
A novel area efficient vlsi architecture for recursion computation in lte tur...
A novel area efficient vlsi architecture for recursion computation in lte tur...
A downlink scheduler supporting real time services in LTE cellular networks
A downlink scheduler supporting real time services in LTE cellular networks
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ma112008id371
The document proposes a new multiuser detection algorithm for CDMA based on the belief propagation algorithm. It develops a factor graph that represents the posterior distribution of information bits in a way that reduces the number of cycles compared to previous factor graphs. Numerical simulations show the proposed belief propagation algorithm outperforms the parallel interference canceller detector, especially for signature sequences that produce factor graphs with fewer cycles and weaker cross-correlations between users. The approach shows promise for application to other communication systems.
Fpga based efficient multiplier for image processing applications using recur...
The Digital Image processing applications like medical imaging, satellite imaging, Biometric trait images
etc., rely on multipliers to improve the quality of image. However, existing multiplication techniques
introduce errors in the output with consumption of more time, hence error free high speed multipliers has
to be designed. In this paper we propose FPGA based Recursive Error Free Mitchell Log Multiplier
(REFMLM) for image Filters. The 2x2 error free Mitchell log multiplier is designed with zero error by
introducing error correction term is used in higher order Karastuba-Ofman Multiplier (KOM)
Architectures. The higher order KOM multipliers is decomposed into number of lower order multipliers
using radix 2 till basic multiplier block of order 2x2 which is designed by error free Mitchell log multiplier.
The 8x8 REFMLM is tested for Gaussian filter to remove noise in fingerprint image. The Multiplier is
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compared to existing architectures.
Application of a merit function based interior point method to linear model p...
This paper presents robust linear model predictive control (MPC) technique for small scale linear MPC
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interior point method. We present a merit function based on a path following strategy to calculate the step
length α, which forces the convergence of feasible iterates. The algorithm globally converges to the optimal
solution of the QP problem while strictly following the inequality constraints. The linear system in the QP
problem is solved using LDLT
factorization based linear solver which reduces the computational cost of
linear system to a certain extent. We implement this method for a linear MPC problem of undamped
oscillator. With the help of a Kalman filter observer, we show that the MPC design is robust to the external
disturbances and integrated white noise.
Generalized Parallel CRC Computation
This document presents a method for parallel CRC computation that improves on previous approaches. It derives a recursive formula from the polynomial generator degree that allows generation of parallel CRC circuits independently of the technology used. The approach generates an F-matrix from the polynomial that is used to design circuits for processing multiple bits in parallel. Simulation results show the parallel CRC circuits can process data faster than serial LFSR approaches, with 64-bit parallel processing achieving the fastest speed. The method provides a customizable solution for building parallel CRC hardware across different polynomial generators and data widths.
Xevgenis_Michael_CI7110_ Data_Communications.DOC
This document appears to be a student paper submission for a networking course. It discusses using a microwave backhaul link to connect two company branch offices located on different Greek islands. The paper will analyze how the bit error rate of the microwave link at different signal-to-noise ratios can impact the TCP throughput between the two branches. It will include simulations of the microwave link and the network implementation to examine this relationship and draw conclusions. The paper is divided into sections covering the theoretical background of the communication channel, analysis of error correction coding and modulation, and the planned simulations.
Iaetsd implementation of power efficient iterative logarithmic multiplier usi...
This document describes the design and implementation of a power efficient iterative logarithmic multiplier using Mitchell's algorithm and reversible logic. It involves converting multiplication to addition using logarithmic numbers. The proposed design implements a basic block consisting of leading one detectors, encoders, barrel shifters and a decoder to calculate an approximate product. Error correction circuits are then cascaded with the basic blocks to improve accuracy. The 4x4 reversible logarithmic multiplier is designed and simulated using Xilinx tools, demonstrating lower power consumption through the use of reversible logic.
Design, implementation and evaluation of icmp based available network bandwid...
We propose a method to measure available network ba
ndwidth using the Internet Control Message
Protocol (ICMP). The recently proposed ImTCP techni
que uses Transmission Control Protocol (TCP) data
packets and the corresponding acknowledgement respo
nses to measure the available bandwidth between
sender and receiver. Since ImTCP needs to change th
e sender’s TCP implementation, it needs
modifications to sender’s operating system kernel.
Moreover, ImTCP cannot measure available bandwidth
accurately if the receiver sends delayed acknowledg
ments. These problems stem from the use of TCP. In
this paper, we discuss an ICMP-based method that ov
ercomes these limitations. We evaluate the
performance of the proposed method in an experiment
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even if the bandwidth changes during
measurement
Fpga implementation of 4 bit parallel cyclic redundancy code
Abstract This paper presents a different approach to solve the parallel CRC circuit. The previous works have been studied. Certain drawbacks were observed in the previous works. Some authors had used Linear feedback shift registers to do serial implementation. This approach resulted in a circuit that was inefficient in terms of time utilization. Though some authors had used the concept of parallel CRC but there was scope for improvement. We have worked on the related issues and have proposed an efficient mechanism. We have developed the VHDL code using VHDL structural modelling. The work was also compared with existing models of parallel implementation of four bit CRC circuit. The code is written for four bit parallel CRC and FPGA implementation of the code was done. Comparing with existing work, the proposed model is more efficient in terms of hardware utilization. As the hardware utilization has been been done in an efficient way, the overall efficiency of the parallel CRC is found to improve. Keywords: CRC,PARALLEL CRC, STRUCTURAL MODELLING
IRJET- The RTL Model of a Reconfigurable Pipelined MCM
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Application of a merit function based interior point method to linear model p...
This paper present
s
robust linear model predictive control (MPC) technique for small scale linear MPC
problems. The quadratic programming (QP) problem arising in linear MPC is solved using primal dual
interior point method
.
We present
a me
rit function based on a path following strategy
to calculate the step
length
α
, which
forces the convergence of feasible iterates
. The algorithm globally converges to the optimal
solution
of the QP p
roblem while strictly following
the
inequality
constraint
s.
The linear system in the QP
problem is solved using LDL
T
factorizatio
n based linear solver which reduces the computational cost of
linear system to a certain extent
.
We implement this method for
a
linear MPC problem of undamped
oscillator. With the help
of a Kalman filter observer, we show that the MPC design is robust to the external
disturbances and integrated white noise.
vorlage
This document summarizes a bachelor thesis that implemented and simulated various low-density parity-check (LDPC) codes in fast fading environments. The thesis first provides background on channel coding, LDPC codes, channel models, and performance metrics. It then describes generating a simulation model in MATLAB to test LDPC codes over Rayleigh fading channels and additive white Gaussian noise channels. Results are presented on bit error rate performance and extrinsic information transfer charts. The goal was to evaluate LDPC code performance and design an effective system concept validated through computer simulation.
StateKeeper Report
UCLA CS219 Course Project Report (Prof. George Varghese)
StateKeeper: Generalizing Reachability
Today there are many tools that are built using formal methods to
verify networks. The majority of these tools check network specifi-
cations and configurations to identify only a limited class of failures
such as Reachability, Forwarding Loops and Slicing. They don’t take
into account the rate-limiting rules that affect the throughput of the
system and also link delays. Both of these quantities are responsible
for the Quality of Service (QoS). We believe that without a decent
throughput and affordable delay, a network is pretty much in a
dead state even if it passes the tests for reachability, forwarding
detection, and other such failure classes. We developed StateKeeper,
a tool based on ideas from Atomic Predicates Verifier. StateKeeper
keeps track of both network performance and network reachability.
In our experiments, we factor in link delay and throughput as our
performance metrics. StateKeeper will allow network operators
to verify Quality of Service at each port along a route by showing
information about the state of each step.
Masters Thesis
This document discusses Kinect fusion-based simultaneous localization and mapping (SLAM) systems for mobile robotics. It presents an example Kinect-based SLAM system that uses Kinect fusion to provide dense, real-time 3D mapping of a volume. The system aims to map larger volumes while also tracking human targets. It compares several variants of the iterative closest point (ICP) algorithm used for point cloud alignment, including ones using constant velocity and non-linear least squares estimation models. It also explores using RGB and depth data with features to initialize ICP transformations. Results show the frame-wise errors of different ICP variants on benchmark datasets.
Implementation of a bit error rate tester of a wireless communication system ...
Implementation of a bit error rate tester of a wireless communication system ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and TechnologyImplementation of Area & Power Optimized VLSI Circuits Using Logic Techniques
To achieve the reduction of power consumption, optimizations are required at various levels of the design steps such as algorithm, architecture, logic and circuit & process techniques. This paper considers the two logic level approaches for low power digital design. Optimization techniques are carried to reduce switching activity power of individual logic-gates. we can reduce the power by using either circuit level optimization or logical level optimization. In this paper, the circuit level optimization process is followed to reduce the area and power. In the first approach, Modified gate diffusion input (GDI) logic is used in the proposed parallel asynchronous self time adder (PASTA) technique. Similarly, the structure of XOR gate and half adder is reduced to achieve the low area and low power. In second approach, Multi value logic based digital circuit is designed by increasing the representation domain from the two level (N=2) switching algebra to N > 2 levels. The main advantage of this approach is to compensate the inefficiency of existing integrated circuits that are used to implement the universal set of MVL gates. From the results, the proposed GDL logic based Adder offers less number of transistors (area) and low power consumption than the existing technique. And proposed MVL technique allows designing MVL digital circuit that is set to obtain the values from the binary circuits. Also this technique offers low power and small wiring delay, when compared to binary and three value logic. The simulation process is carried out by tanner toolv14.11 to check the functionality of the PASTA & MVL circuits.
High Speed and Area Efficient Booth Multiplier Using SQRT CSLA with Zero Find...
Addition is one of the common and widely used fundamental arithmetic operation in many VLSI systems. The critical elements in general purpose and digital-signal processing processors are High performance VLSI integer adders as they are employed in the design of Arithmetic-Logic Units, in floating-point arithmetic data paths and in address generation units. The performance parameters for any adder are area, speed and delay. By using Square Root Carry Select Adder (SQRT CSLA), speed can be achieved. In designing new architecture, the Tradeoff between those parameters plays the major role. We can reduce area by using Zero Finding Logic (ZFC) technique, from the structure of SQRT CSLA. By using the Modified architecture we can reduce area. We can implement Booth multiplier by using the CSLA and SQRT CSLA with Zero finding logic. Implementation of Booth multiplier by using CSLA and SQRT CSLA with Zero finding logic is proposed for better speed applications and efficient area applications.
IJCER (www.ijceronline.com) International Journal of computational Engineerin...
1) The document proposes a mathematical model and optimization service to predict the optimal number of parallel TCP streams needed to maximize data throughput in a distributed computing environment.
2) It develops a novel model that can predict the optimal number using only three data points, and implements this service in the Stork Data Scheduler.
3) Experimental results show the optimized transfer time using this prediction and optimization service is much less than without optimization in most cases.
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The Mobile WiMAX simulation model is
implemented by using MATLAB code. The simulation model
consists of different phases which will help us to model the
transmitter and receiver section. In the next phase, the data is
being modulated by using the modulation methods QPSK and
QAM followed by OFDM transmitter. These phases can be
used to show the performance of these modulation methods
under varying condition. The Multipath Rician fading model is
implemented to introduce the fading in the transmitter data.
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into the OFDM demodulation. In the next phase, Fast Fourier
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Iaetsd gmsk modulation implementation for gsm in dsp
This document describes the implementation of a GMSK modulator on a TMS320C6713 digital signal processor. GMSK modulation is used in GSM cellular systems due to its bandwidth efficiency. The author designed a simple algorithm to accurately generate GMSK signals in DSP. Key components included a numerically controlled oscillator and Gaussian low-pass filter implemented as a finite impulse response filter. Simulation results were obtained using Elanix software to verify the GMSK modulator design.
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Implementation of Area & Power Optimized VLSI Circuits Using Logic Techniques
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What is an RPA CoE? Session 1 – CoE Vision
In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
• The role of a steering committee
• How do the organization’s priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
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ma112006id337
- 1. Multiuser Detection Algorithms for CDMA based on the Message Passing Algorithms Waseda University, Japan Shunsuke Horii Tota Suko Toshiyasu Matsushima
- 6. 2 ． Synchronous DS CDMA Channel Model with K users Channel receiver Gaussian noise The signals of all users are multiplexed. Gaussian noise is added.
- 20. 6 ． Simulations Simulation Conditions Ⅰ ． Comparison of the detectors with the bit error rate ※ assumption to approximate
- 21. 6 ． Simulations The performance of the BP for the Factor Graph Ⅱis not good. The performance of the CCCP for the Factor Graph Ⅱis near to the MPM detector’s performance
- 22. The performance of the BP for the Factor graph Ⅱ is improved. The performance of the approx. CCCP for the FG Ⅰ is not good. 6 ． Simulations ※Absolute values of the cross correlations tends to take small values when the length of the signature sequence is large.
- 23. 6 ． Simulations Simulation Conditions Ⅱ ． Comparison of the approx. CCCP for the FGⅠ and the CCCP for the FGⅡ
- 24. 6 ． Simulations The bit error rate of the approx. CCCP for the Factor Graph Ⅰ doesn’t decrease for the increase in the number of updates in the outer loop.
- 25. 6 ． Simulations The bit error rate of the approx. CCCP for the Factor Graph Ⅰdecreases for the increase in the number of updates in the outer loop. imply The approx. CCCP for the Factor Graph Ⅰ needs more number of updates in the Inner loop.
- 29. Appendix A
- 30. Appendix B