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We consider relay broadcast channels (RBCs) with multiple antennas at all nodes. A practical linear precoding, relaying and combining scheme is proposed. Under an overall power constraint, we derive the optimal power allocation solution in a closed form. A low complexity beamforming vector optimization algorithm is proposed to maximize the effective channel gains and improve the system performance...
We consider a multi-user (MU) multiple-input multiple-output (MIMO) channel where each node is equipped with multiple antennas. An orthogonal projection optimization (OPO) algorithm is proposed based on linear transmit beamforming and receive combining. The performance of the OPO algorithm is analyzed which discloses its convergence characteristics. The complexity of the OPO algorithm is also addressed...
We consider two-way relay channels (TWRCs) with multiple antennas at the relay node. Two stage communications are considered, where both sources transmit during the multiple access (MA) stage, and the relay transmits during the broadcast (BC) stage. An optimized network coding scheme is proposed. For the MA stage, a maximum likelihood algorithm is proposed to decode the XOR of the signals received...
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