Back to Search Start Over

Dirty-Paper Coding Versus TDMA for MIMO Broadcast Channels

Authors :
Nihar Jindal
Andrea Goldsmith
Source :
IEEE Transactions on Information Theory. 51:1783-1794
Publication Year :
2005
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2005.

Abstract

We compare the capacity of dirty-paper coding (DPC) to that of time-division multiple access (TDMA) for a multiple-antenna (multiple-input multiple-output (MIMO)) Gaussian broadcast channel (BC). We find that the sum-rate capacity (achievable using DPC) of the multiple-antenna BC is at most min(M,K) times the largest single-user capacity (i.e., the TDMA sum-rate) in the system, where M is the number of transmit antennas and K is the number of receivers. This result is independent of the number of receive antennas and the channel gain matrix, and is valid at all signal-to-noise ratios (SNRs). We investigate the tightness of this bound in a time-varying channel (assuming perfect channel knowledge at receivers and transmitters) where the channel experiences uncorrelated Rayleigh fading and in some situations we find that the dirty paper gain is upper-bounded by the ratio of transmit-to-receive antennas. We also show that min(M,K) upper-bounds the sum-rate gain of successive decoding over TDMA for the uplink channel, where M is the number of receive antennas at the base station and K is the number of transmitters.

Details

ISSN :
00189448
Volume :
51
Database :
OpenAIRE
Journal :
IEEE Transactions on Information Theory
Accession number :
edsair.doi...........c723824b2dc6f67aeae071f7669cff0d