Multiuser Diversity - Multiplexing Tradeoff in MIMO Broadcast Channels with Limited Feedback

Marios Kountouris, Ruben de Francisco, David Gesbert, Dirk T. M. Slock, Thomas Salzer
2006 2006 Fortieth Asilomar Conference on Signals, Systems and Computers  
We consider joint scheduling and beamforming in a broadcast channel with multiple antennas at the transmitter and a single antenna at the mobile receiver. Perfect channel knowledge is assumed to be available at the receiver while the transmitter is provided with partial channel state information (CSIT) through a limited rate feedback channel. Each user feeds back quantized information regarding the channel vector direction (from a codebook) and a quantized (scalar) channel quality indicator. We
more » ... identify the tradeoff between multiuser diversity and spatial multiplexing gain given a limited amount of feedback bits. Scaling laws of the above parameters are derived in order to achieve a target rate performance. Our results reveal useful design guidelines for the split of feedback bits for channel quantization and channel quality.
doi:10.1109/acssc.2006.354769 fatcat:7ucyavrlajahvhyhp4n6knl2cy