| Paper: | SPCOM-P5.4 | ||
| Session: | MIMO Capacity Maximization/Space-Time Coding | ||
| Time: | Wednesday, May 19, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Compression, Coding, and Modulation | ||
| Title: | VARIABLE-RATE ADAPTIVE MODULATION IN MIMO SYSTEMS EXPLOITING MULTIUSER DIVERSITY | ||
| Authors: | Lan Tang; Jilin University | ||
| Shu-Xun Wang; Jilin University | |||
| Ying-Chang Liang; Institute for Infocomm Research | |||
| Abstract: | An adaptive modulation technique for multiuser MIMO systems with multiuser diversity is proposed. This technique maximizes the sum of the instantaneous bit rate under a target BER constraint by feeding back sub-channel SNRs only. By generating a random transmit beamforming matrix with water-filling configuration, each user estimates and feeds back the effective SNRs for its sub-channels. With each user’s sub-channel SNRs, the transmitter then schedules the transmission to one particular selected with proportional fair scheduling algorithm. Finally, adaptive modulation is applied to each sub-channel of the selected user based on the BER constraint. The simulation results show that the throughput of proposed method converges to that of eigen-beamforming when the number of users in a cell is large. | ||
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