The problem of multiuser scheduling and beamforming with partial channel state information at the transmitter (CSIT) is considered here in the particular context of op- portunistic beamforming. We consider a random multi-user beamforming scheme and show how long-term statistical information of users' channels can be efficiently combined with short-term SINR feedback to increase system performance substantially over a conventional opportunistic beamforming scheme. We propose a channel estimation method to be used by the transmitter which exploits the second-order channel statistics, the fading statistics and the information contained in the instantaneous SINR feedback of random opportunistic beamforming. This coarse (low feedback-based) channel estimate is shown to be particularly valuable for the purpose of user selection, as well as for the precoding matrix design.
Transmit correlation-aided opportunistic beamforming and scheduling
EUSIPCO 2006, 14th European Signal Processing Conference, September 4-8, 2006, Florence, Italy
Systèmes de Communication
© EURASIP. Personal use of this material is permitted. The definitive version of this paper was published in EUSIPCO 2006, 14th European Signal Processing Conference, September 4-8, 2006, Florence, Italy and is available at :
PERMALINK : https://www.eurecom.fr/publication/2018