Provided by: Institute of Electrical & Electronic Engineers
Date Added: May 2012
Under a given modulation scheme and a target BER (Bit Error Rate) requirement, it is difficult to increase the number of bits transmitted in each symbol (i.e., the rate), since this generally requires a significant increase of transmit power. In this paper, the authors study how to increase the rate in MultiUser Multiple-Input Multiple-Output (MU-MIMO) broadcast channels using only bit and power loading, without requiring additional transmit power. To solve this challenging problem, their approach is to carry out a joint design of bit loading and power allocation over all streams, and meanwhile take user and stream selection into account.