標題: | Achievable Throughput for Dual-Mode Limited-Feedback Transmit Beamforming over Temporally Correlated Wireless Channels |
作者: | Chang, Yi-Chieh Wu, Jwo-Yuh Lee, Ta-Sung 電機工程學系 Department of Electrical and Computer Engineering |
關鍵字: | Beamforming;Limited-Feedback Communications;Time-Varying Channels;Throughput;Mode Selection |
公開日期: | 2010 |
摘要: | Achieving high system throughput for limited-feedback communications against the time-varying channel effect is rather crucial in modern mobile system designs. Within the beamforming setup, this paper derives analytic throughput results for both the "more feedback less often" and "less feedback more often" scenarios. More specifically, under the assumptions that (i) the channels over two consecutive time slots follow the first-order Markov model and (ii) in each time slot, reliable feedback of a fixed amount of bits is allowed, the achievable system throughput over two consecutive time slots in both scenarios are characterized. In particular, while the exact throughput is in an integral form, we derive the associated closed-form approximate formulae which facilitate throughput evaluation without resorting to numerical integration. The analytic results also lead to a very low-complexity throughput-based mode selection scheme. Simulation study shows that: (1) the derived closed-form approximation is quite accurate; (2) with the aid of the proposed mode selection method, the throughput performance is robust against the channel temporal variation. |
URI: | http://hdl.handle.net/11536/25765 |
ISBN: | 978-1-4244-2519-8 |
ISSN: | 1550-2252 |
期刊: | 2010 IEEE 71ST VEHICULAR TECHNOLOGY CONFERENCE |
顯示於類別: | 會議論文 |