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Dirty-Paper Coding Versus TDMA for MIMO Broadcast Channels
- 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.
- Subjects :
- business.industry
ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS
MIMO
Time division multiple access
Data_CODINGANDINFORMATIONTHEORY
Library and Information Sciences
Topology
Precoding
Computer Science Applications
Channel capacity
Base station
Dirty paper coding
Telecommunications
business
Decoding methods
Computer Science::Information Theory
Information Systems
Mathematics
Rayleigh fading
Subjects
Details
- ISSN :
- 00189448
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Information Theory
- Accession number :
- edsair.doi...........c723824b2dc6f67aeae071f7669cff0d