| |
| A single-antenna multi-relay system base on vector quantization which includes direct links is proposed in this paper. First, relay system model that is equivalent to a virtual Multiple-Input Multiple-Output (MIMO) system, and the source node imports time-domain precoding matrix. Second, mutual information is taken as system optimization objective, and vector quantization (VQ) method is used to build a codebook and power allocation matrix. Practically, as the receiver can't acquire a perfect channel state information (CSI), so the limited feedback idea is used, receiver sends the part of CSI information to source node, the source node according to this, uses the VQ method to build a codebook, then the relay system precoding design is completed. simulation results show that the proposed VQ-based precoding has improved system capacity and reduced bit error rate . |
|
| Keywords:CIS; multi-relay system; vector quantization; codebook; limited feedback |
|
