Abstract
Joint sub-optimization of cooperative relays in Multiple-Input and Multiple-Output (MIMO) multiple relays aided communication system is discussed in this paper. Because the instantaneous channel state information of all source-relay channels and all relay-user channels is difficult to get at each relay node, an unjoined solution is designed according to the channel state information of that relay only. Then a multi-user loading algorithm is proposed to utilize the space diversity through multi-relay transmission. The simulation results show that with the newly proposed multi-user loading algorithm, the unjoined solution can achieve better system performance comparing with joint one in low SNR. However, the complexity of the former is much lower, for only partial CSI is needed.
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Supported by National Basic Research Program of China (2007CB310603), National Natural Science Foundation of China (No.60672093), and National High Technology Project of China (2007AA01Z262).
Communication author: Yu Fei, born in 1980, male, Ph.D.
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Yu, F., Yang, L. Partial channel state information based sub-optimal SDMA strategies in multiple relay channels. J. Electron.(China) 26, 473–478 (2009). https://doi.org/10.1007/s11767-007-0178-x
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DOI: https://doi.org/10.1007/s11767-007-0178-x