Title :
Approaching MIMO-OFDM Capacity with Per Antenna Power and Rate Feedback
Author :
Zhang, Rui ; Cioffi, John M. ; Liang, Ying-Chang
Author_Institution :
Department of Electrical Engineering, Stanford University. Email: ee.ruizhang@stanford.edu
fDate :
6/1/2006 12:00:00 AM
Abstract :
For block fading channls, the delay-limited capacity measures the maximum constant-rate achievable over all fading blocks under the availability of complete channel knowledge at both the transmitter and the receiver. In this paper, we consider constant-rate transmissions over MIMO-OFDM block fading channels, under the condition that the channel is known at the receiver but unknown at the transmitter. We consider the well-known V-BLAST architecture that employs independently encoded data for each transmit antenna and present a closedloop extension of V-BLAST whereby the receiver jointly optimizes the rate and power assignments for each transmit antenna and then informs them to the transmitter via a low-rate feedback channel. Simulation results have confirmed that the closed-loop V-BLAST architecture can approach closely the channel delaylimited capacity if a capacity-achieving scalar code is used at each transmit antenna.
Keywords :
Antenna feeds; Broadband antennas; Channel capacity; Delay; Fading; Feedback; MIMO; Receiving antennas; Transmitters; Transmitting antennas;
Conference_Titel :
Communications, 2006. ICC '06. IEEE International Conference on
Print_ISBN :
1-4244-0355-3
Electronic_ISBN :
8164-9547
DOI :
10.1109/ICC.2006.255511