NDLI: Improved coded massive MIMO OFDM detection using LLRs derived from complex ratio distributions

Content Provider	IEEE Xplore Digital Library
Author	Al-Askery, A. Tsimenidis, C.C. Boussakta, S. Chambers, J.A.
Copyright Year	2015
Description	Author affiliation: Sch. of Electr. & Electron. Eng., Newcastle Univ., Newcastle upon Tyne, UK (Al-Askery, A.; Tsimenidis, C.C.; Boussakta, S.; Chambers, J.A.)
Abstract	In this paper, a novel receiver is proposed for coded massive Multiple-Input-Multiple-Output systems using Orthogonal Frequency Division Multiplexing (MIMO-OFDM). The receiver utilizes log-likelihood ratios (LLR) derived from complex ratio distributions to model the noise probability density function (PDF) at the output of a zero-forcing detector. These LLRs are subsequently used to improve the performance of the decoding of Low Density Parity Check (LDPC) codes. The Neumann large matrix approximation is employed to simplify the matrix inversion in deriving the PDF. To verify the new findings, Monte Carlo simulations are used to demonstrate the optimality of the fitting between the derived PDF the experimentally obtained histogram of the noise. Further simulations results over time-flat frequency selective multi-path fading channels demonstrated improved performance over equivalent systems using the Gaussian approximation for the PDF of the noise. A significant gain of 1 dB was observed at bit error rate of 10-4 which corresponds to a reduction of approximately 30 receive antenna elements.
Starting Page	64
Ending Page	68
File Size	189086
Page Count	5
File Format	PDF
e-ISBN	9781467381864
DOI	10.1109/CAMAD.2015.7390482
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-07
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Analytical models Soft bit Massive Multiple-input Multiple-output (MIMO) system Noise distribution OFDM Linear detectors Detectors Receivers Parity check codes MIMO Low density parity-check (LDPC) coded massive MIMO Complexity theory
Content Type	Text
Resource Type	Article

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