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International Conference on IEEE ICT Convergence 2013

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Cooperative Water Filling (CoopWF) Algorithm for Small Cell Networks

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International Conference on IEEE ICT Convergence 2013

  1. 1. Cooperative Water Filling (CoopWF) Algorithm for Small Cell Networks International Conference on ICT Convergence 2013 Toha Ardi Nugraha, Soo Young Shin Department of IT Convergence, Kumoh National Institute of Technology
  2. 2. This paper proposes a new power allocation algorithm with pre-coding in cooperative small cell networks (SCNs). A power allocation algorithm based on cooperative water- filling (CoopWF) is proposed and block diagonalization (BD) precoding is adopted to cancel the inter-user interferences. The proposed scheme is easily implementable to SCNs such as femto-cell, metro-cell, and pico-cell. Simulation results show that the proposed CoopWF algorithm provides better mean capacity compared to the existing power allocation algorithm. Abstract
  3. 3. • Small cell network (SCN) such as femto-cell, metro-cell or pico-cell is an effective solution for increasing the capacity of wireless communication systems especially in the indoor public areas. • SCN is generally implemented via a optical fiber backbone and allows a reliable fast exchange of information among SCNs • In SCN, a cooperative communication can be easily implemented. • Cooperative communication is an effective strategy to mitigate inter- cell interference and also it can dramatically improve the system performance Problem Statement
  4. 4. • A power allocation algorithm based on cooperative water- filling (CoopWF) is proposed and block diagonalization (BD) precoding is adopted • This paper propose cooperative power allocation algorithm with BD precoding for small cell networks. • The proposed algorithm is implemented and simulated in the multi-user MIMO (MU-MIMO) SCN to measure the mean system capacity. Objectives
  5. 5. • Cooperative communication can be represented by Multi-cell MIMO system model as shown in Fig.1 • Several small cells having Nt transmit antennas and uj user equipment's (UEs) having Nr receive antennas. • The two users are randomly located within the overlapping of the cell edge zone (see Fig.1) with the radius of each small cell (R) is 20 meter. • The indoor path-loss, for a small cell is modeled as a modified COST-231 indoor propagation model. • The received signal at the uj UE is given by • The received signal for the user uj after BD is Cooperative Water Filling
  6. 6. The paper evaluate the performance of the cooperative small cells with the number of C = 2 and 3 as shown in Fig.1 The number of antennas at each small cell as transmitter Nt = 2 and each user device as receiver is equipped with Nr = 2 antennas. Small Cell Network Architectures
  7. 7. When SNR is 0 dB, the mean capacity of our propose algorithm with C=3 cells improved about 0.3 Mbps compare to the previous algorithm with the same number of cooperative small cell networks. Simulation Result
  8. 8. This paper proposes a power allocation algorithm with block diagonalization (BD) precoding in cooperative small cell networks. The proposed scheme is easily implementable to small cell networks such as femtocell, metro-cell, and pico-cell. In our simulation result, we have shown that the proposed algorithm could improve mean capacity. The simulation result is in line with the concept of water filling that improved spectral efficiency on the low SNR. From the simulation result, when SNR is -10 dB until 0 dB, the mean capacity of our propose algorithm with C=3 cells increased about 0.4 Mbps compare to the previous algorithm with C=3 cells. Conclusion

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