Abstract:

A multiplecell coordinated multiple point (CoMP) scheme based on limited feedback was proposed, then specific operations at the transmitter and the receiver were described. A feedback scheme for general unitary matrices was presented where the QR decomposition precoding was used at the transmitter. Moreover, an enhanced feedback scheme with minor quantization error and less feedback overhead was presented because of channel quality information sharing with the cooperatingcells, which improved the system performance dramatically at the expense of a few feedback bits, since the multiple subchannels were combined coherently at the receiver. The equivalent channel matrix was not a triangle matrix due to the quantization error. Hence, a modified successive interference cancellation (SIC) receiver was presented. Simulation results demonstrate that the proposed scheme outperforms traditional ones on the system throughput.

Key words: communication, CoMP, limited feedback, precoding, SIC receiver