A Novel Low Complexity Lattice Reduction-Aided Iterative Receiver for Overloaded MIMO

Satoshi DENNO  Yuta KAWAGUCHI  Tsubasa INOUE  Yafei HOU  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.5   pp.1045-1054
Publication Date: 2019/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3215
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
noise cancelling,  hard-input soft-output,  iterative detection,  serial interference cancellation,  low complexity,  

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This paper proposes a novel low complexity lattice reduction-aided iterative receiver for overloaded MIMO. Novel noise cancellation is proposed that increases an equivalent channel gain with a scalar gain introduced in this paper, which results in the improvement of the signal to noise power ratio (SNR). We theoretically analyze the performance of the proposed receiver that the lattice reduction raises the SNR of the detector output signals as the scalar gain increases, when the Lenstra-Lenstra-Lova's (LLL) algorithm is applied to implement the lattice reduction. Because the SNR improvement causes the scalar gain to increase, the performance is improved by iterating the reception process. Computer simulations confirm the performance. The proposed receiver attains a gain of about 5dB at the BER of 10-4 in a 6×2 overloaded MIMO channel. Computational complexity of the proposed receiver is about 1/50 as much as that of the maximum likelihood detection (MLD).