Achieving near-capacity at low SNR on a multiple-antenna multiple-user channel
IEEE Transactions on Communications
Policy-based multiple access for decentralized low power systems
IEEE Transactions on Wireless Communications
Minimum energy per bit for Gaussian broadcast channels with common message and cooperating receivers
Allerton'09 Proceedings of the 47th annual Allerton conference on Communication, control, and computing
Bandwidth and power allocation for cooperative strategies in Gaussian relay networks
IEEE Transactions on Information Theory
Energy efficient communications over the AWGN relay channel
IEEE Transactions on Wireless Communications
Cooperation in the low power regime for the MAC using multiplexed rateless codes
IEEE Transactions on Signal Processing
Superiority of superposition multiaccess with single-user decoding over TDMA in the low SNR regime
IEEE Transactions on Information Theory
Multi-cell MIMO cooperative networks: a new look at interference
IEEE Journal on Selected Areas in Communications - Special issue on cooperative communications in MIMO cellular networks
On Multiple Access Using H-ARQ with SIC Techniques for Wireless Ad Hoc Networks
Wireless Personal Communications: An International Journal
| Hi-index | 754.96 |
We consider multiaccess, broadcast, and interference channels with additive Gaussian noise. Although the set of rate pairs achievable by time-division multiple access (TDMA) is not equal to the capacity region, the TDMA achievable region converges to the capacity region as the power decreases. Furthermore, TDMA achieves the optimum minimum energy per bit. Despite those features, this paper shows that the growth of TDMA-achievable rates with the energy per bit is suboptimal in the low-power regime except in special cases: multiaccess channels where the users' energy per bit are identical and broadcast channels where the receivers have identical signal-to-noise ratios. For the additive Gaussian noise interference channel, we identify a small region of interference parameters outside of which TDMA is also shown to be suboptimal. The effect of fading (known to the receiver) on the suboptimality of TDMA is also explored.