Capacity Enhancement in the Downlink Using Space-Division Opportunistic Beamforming
With many users waiting to be served in a queue, opportunistic beamforming (OBF) permits true beamforming to be performed without the need of channel state information (CSI) being known at the transmitter so that multiuser diversity can still be exploited in a little scattering environment. In this regard, it is commonly felt that OBF will not provide any gain in independent Rayleigh fading channels because the channel fluctuation among the users is already at maximum. In this paper, however, OBF is proposed for support of multiple users in the spatial domain, dubbed space-division OBF and therefore the sum-throughput of the system can be enhanced even in fast independent Rayleigh fading channels. The interpretation is that asymptotically, there will be some users whose channels are near-orthogonal and match with the antenna weights randomly generated at the transmitter to produce true beamforming. This paper also presents an efficient scheduling scheme to mediate access the channel using space-division OBF.
Kai-Kit Wong
Centre for Communications Systems and Technology The University of Hull Kingston Upon Hull, HU6 7RX United Kingdom
国际会议
武汉
英文
557-560
2005-09-23（万方平台首次上网日期，不代表论文的发表时间）