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In this paper, we study an iterative beamforming scheme for downlink multiuser channels. The sum-rate of the system can be maximized by weighted sum-rate maximization method. However, the interference of leakage signal is not considered in this method. We propose a new metric named leakage sum-rate (LSR) to treat leakage interference. Then, the leakage sum-rate maximization is modeled by the power...
This paper address the problem of designing jointly the linear transmitters and receiver in a non-regenerative MIMO relay system, where linear processing is applied at the source, relay and destination node, using minimum mean square error (MMSE) criterion. Under the average power constraints at both the source and relay node, the iterative optimization method is presented and a low-complexity block...
Interleave-division multiple access (IDMA) has recently been introduced in relay systems in order to exploit diversity gain. Combining with delay-diversity (DD), the relay scheme based on IDMA can support multiple users. In this paper, we extend the DD-IDMA relay scheme to MIMO relay networks employing spatial multiplexing. We also develop a symbol-by-symbol iterative detection method at the destination...
Based on factor graph and sum-product algorithm, an iterative acquisition algorithm for multiple PN codes is proposed. This algorithm combines the BP decoding algorithm and the chip level MUD as an iterative loop to fulfil the task of parallel acquisition for multiple PN codes. Simulation and analysis results show that the performance of this algorithm is slightly poorer than the full parallel search...
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