Beam division multiple access transmission for massive MIMO communications

Chen Sun, Xiqi Gao, Shi Jin, Michail Matthaiou, Zhi Ding, Chengshan Xiao

Research output: Contribution to journalArticlepeer-review

210 Citations (Scopus)

Abstract

We study multicarrier multiuser multiple-input multiple-output (MU-MIMO) systems, in which the base station employs an asymptotically large number of antennas. We analyze a fully correlated channel matrix and provide a beam domain channel model, where the channel gains are independent of sub-carriers. For this model, we first derive a closed-form upper bound on the achievable ergodic sum-rate, based on which, we develop asymptotically necessary and sufficient conditions for optimal downlink transmission that require only statistical channel state information at the transmitter. Furthermore, we propose a beam division multiple access (BDMA) transmission scheme that simultaneously serves multiple users via different beams. By selecting users within non-overlapping beams, the MU-MIMO channels can be equivalently decomposed into multiple single-user MIMO channels; this scheme significantly reduces the overhead of channel estimation, as well as, the processing complexity at transceivers. For BDMA transmission, we work out an optimal pilot design criterion to minimize the mean square error (MSE) and provide optimal pilot sequences by utilizing the Zadoff-Chu sequences. Simulations demonstrate the near-optimal performance of BDMA transmission and the advantages of the proposed pilot sequences.
Original languageEnglish
Pages (from-to)2170-2184
Number of pages15
JournalIEEE Transactions on Communications
Volume63
Issue number6
Early online date23 Apr 2015
DOIs
Publication statusPublished - Jun 2015

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