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