Block-Markov encoding with network coding for cooperative communications
Computer Communications
Cooperative and constrained MIMO communications in wireless ad hoc/sensor networks
IEEE Transactions on Wireless Communications
Opportunistic cooperation for multi-antenna multi-relay networks
IEEE Transactions on Wireless Communications
Future Generation Computer Systems
Optimizations of a MIMO Relay Network
IEEE Transactions on Signal Processing - Part II
Power-Bandwidth Tradeoff in Dense Multi-Antenna Relay Networks
IEEE Transactions on Wireless Communications
Cooperative Filter-and-Forward Beamforming for Frequency-Selective Channels with Equalization
IEEE Transactions on Wireless Communications
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
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This paper deals with distributed spatial precoding techniques in broadcast scheme based on QR decomposition (QRD). Given the total transmit power of all relay nodes, the distributed spatial precoder assigns different transmitting power to each relay node. Each distributed precoder is equivalent to a spot in multi-dimensional space. Based on system capacity maximization, an improved particle swarm optimization (PSO) algorithm is proposed, which is used to search for a global optimal solution in d-dimension space. The simulation shows that the distributed spatial precoding algorithm based on the PSO algorithm can enhance system capacity performance effectively. Compared with the traditional QRD broadcast scheme, this paper's new distributed precoding can enhance about 20% system capacity gain.