Name
Abstract | ||
|---|---|---|
Multiple transmitting antennas can considerably increase downlink spectral efficiency by beamforming to multiple users at the same time. However, multiuser beamforming requires channel state information (CSI) at the transmitter, which essentially leads to training overhead. In this paper, we propose and analyze a sequential beamforming strategy that utilizes full-duplex base station to implement downlink data transmission concurrently with CSI acquisition via in-band closed and open loop training. Our results demonstrate that full-duplex capability at a base station can be used to increase spectral efficiency significantly for multiuser downlink transmission. In moderate SNR regimes, we analytically derive tight approximations for the optimal training duration for closed and open loop training, and characterize the associated respective spectral efficiency. We further characterize the enhanced multiplexing gain performance in high SNR regime. In both regimes, the performance of our proposed full-duplex strategy is compared to half-duplex counterpart to quantify spectral efficiency improvement. With experimental data, in a typical 1.4 MHz LTE band, where the block length is around 500 symbols, the proposed sequential beamforming strategy attains a spectral efficiency improvement of 130% and 12% for 8 x 8 systems with closed and open loop training, respectively. |
Year | Venue | DocType |
|---|---|---|
2015 | CoRR | Journal |
Volume | Citations | PageRank |
abs/1511.02285 | 0 | 0.34 |
References | Authors | |
0 | 3 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Xu Du | 1 | 37 | 15.92 |
| John Tadrous | 2 | 177 | 20.50 |
| Ashutosh Sabharwal | 3 | 5731 | 427.69 |