New space-time code constructions for two-user multiple access channels

Francis Lu*, Roope Vehkalahti, Camilla Hollanti, Jyrki Lahtonen, Yi Hong, Emanuele Viterbo


研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)


This paper addresses the problem of constructing multiuser multiple-input multiple-output (MU-MIMO) codes for two users. The users are assumed to be equipped with nt transmit antennas, and there are nr antennas available at the receiving end. A general scheme is proposed and shown to achieve the optimal diversity-multiplexing gain tradeoff (DMT). Moreover, an explicit construction for the special case of nr=2 and n r=2 is given, based on the optimization of the code shape and density. All the proposed constructions are based on cyclic division algebras and their orders and take advantage of the multi-block structure. Computer simulations show that both the proposed schemes yield codes with excellent performance improving upon the best previously known codes. Finally, it is shown that the previously proposed design criteria for DMT optimal MU-MIMO codes are sufficient but in general too strict and impossible to fulfill. Relaxed alternative design criteria are then proposed and shown to be still sufficient for achieving the multiple-access channel diversity-multiplexing tradeoff.

頁(從 - 到)939-957
期刊IEEE Journal on Selected Topics in Signal Processing
出版狀態Published - 12月 2009


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