標題: Selection and Rate-Adaptation Schemes for MIMO Multiple-Access Channels With Low-Rate Channel Feedback
作者: Tang, Ti-Wen
Tien, Hsiao-Ting
Lu, Hsiao-feng (Francis)
電機資訊學士班
Undergraduate Honors Program of Electrical Engineering and Computer Science
關鍵字: MIMO multiple-access channel;feedback channel;diversity-multiplexing tradeoff;selection algorithm;rate adaptation
公開日期: 1-Nov-2015
摘要: In this paper, two selection schemes are proposed for coded transmission over multiple-input multiple-output (MIMO) multiple-access channels (MAC) to yield a much higher diversity-multiplexing gain tradeoff (DMT) performance. These schemes require a channel feedback, but at an extremely low rate. The first scheme is based on user selection and can be easily implemented in the existing MIMO-MAC systems. Upper bounds on the minimal computational complexity required by sphere decoders to decode DMT-optimal codes for this scheme as well as for MIMO MAC without feedback are given. It is shown that this scheme can offer both a much larger DMT and an exponential reduction on decoding complexity, compared with the latter. The second scheme selects jointly the users and their transmit antennas. It requires an additional design of rate assignments for performance optimization. A very general framework on the design of optimal rate assignments is thus provided. It is shown that this scheme can yield DMT performances far superior to the optimal MIMO-MAC DMT without channel feedback. The simulation results confirm that in some cases, this scheme can provide an astonishing SNR gain of 14.64 dB at outage probability 10(-6) compared with the optimal MIMO-MAC coding schemes without feedback.
URI: http://dx.doi.org/10.1109/TIT.2015.2478472
http://hdl.handle.net/11536/128394
ISSN: 0018-9448
DOI: 10.1109/TIT.2015.2478472
期刊: IEEE TRANSACTIONS ON INFORMATION THEORY
Volume: 61
Issue: 11
起始頁: 5948
結束頁: 5975
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