Optimal constellations for the low-SNR noncoherent MIMO block Rayleigh-fading channel
IEEE Transactions on Information Theory
Spectral efficiency of CDMA with random spreading
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Communication over fading channels with delay constraints
IEEE Transactions on Information Theory
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
Multiple-antenna capacity in the low-power regime
IEEE Transactions on Information Theory
Iterative water-filling for Gaussian vector multiple-access channels
IEEE Transactions on Information Theory
Suboptimality of TDMA in the low-power regime
IEEE Transactions on Information Theory
Diversity-multiplexing tradeoff in multiple-access channels
IEEE Transactions on Information Theory
Spectral efficiency of multicarrier CDMA
IEEE Transactions on Information Theory
Dirty-paper coding versus TDMA for MIMO Broadcast channels
IEEE Transactions on Information Theory
The Capacity Region of the Gaussian Multiple-Input Multiple-Output Broadcast Channel
IEEE Transactions on Information Theory
On Noncoherent MIMO Channels in the Wideband Regime: Capacity and Reliability
IEEE Transactions on Information Theory
Interference Alignment and Degrees of Freedom of the -User Interference Channel
IEEE Transactions on Information Theory
Cross-layer design for wireless networks
IEEE Communications Magazine
Hi-index | 754.84 |
This paper studies the Gaussian multiaccess channel with multiantenna basestation in the low signal to noise ratio (SNR) regime. We compare the spectral efficiencies of the optimal superposition channel sharing scheme and two simple alternatives: the time division multiaccess (TDMA) scheme and superposition multiaccess with single-user decoding (SSD). Due to the fact that SSD, but not TDMA, exploits the multiuser multiplexing gain, the relative spectral efficiency of SSD over TDMA grows drastically as the number of antennas at the basestation increases. The results suggest that, in the low SNR regime with multiple antenna basestation, TDMA's suboptimality can no longer be offset by its simplicity since SSD can achieve much higher spectral efficiency while the simplicities of the two channel sharing schemes are similar.