Interference Cancellation for MAC Using Quantized Feedback - Interference Cancellation Using Space-Time Processing and Precoding Design - page 71

again, the performance of our scheme outperforms the performance of the scheme in
[ 1 ] and approaches the performance of the scheme in [ 12 ]. Simulation results show
that by using only a few bits of feedback, one can approach the performance of a
system with perfect feedback.
4.8 Conclusions
In this chapter, we investigate how to cancel the interference and achieve full diversity
for two users with two transmit antennas and one receiver with two receive antennas
in a multiple access channel using quantized feedback. Using quantized feedback,
we propose the precoding and decoding method, the feedback scheme and the code-
book design to cancel interference and achieve full diversity. Also we show that the
performance of our proposed scheme is determined by the number of feedback bits.
With the increase of the feedback bits, the performance of our scheme approaches
that of the system with perfect feedback. Finally we extend our scheme to two users
with any number of transmit antennas and one receiver with any number of receive
antennas. Simulation results are provided to confirm our analytical results.
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