How much feedback overhead is required for base station cooperative transmission to outperform non-cooperative transmission?

13 years 2 months ago

Download mirlab.org

Coherent base station (BS) cooperative transmission provides high spectrum efﬁciency for cellular systems when channel state information (CSI) is perfectly known at the BSs. For frequency division duplexing systems, the CSI is fed back with limited number of bits, which linearly increases with the number of cooperating BSs. In this paper, we study the impact of the quantized CSI on cooperative transmission when zero-forcing beamforming is used. By deriving an optimal bit allocation among local and cross channels according to the locations of users, we show the minimal feedback bits required by cooperative transmission for providing performance gain over non-cooperative transmission.

Xueying Hou, Chenyang Yang

Real-time Traffic