Complexity-reduced MLD based on QR decomposition in OFDM MIMO multiplexing with frequency domain spreading and code multiplexing

Authors:
Kouji Nagatomi;Hiroyuki Kawai;Kenichi Higuchi
Affiliations:
Department of Electrical Engineering, Tokyo University of Science, Noda, Chiba, Japan;Radio Access Network Development Department, NTT DOCOMO, INC., Yokosuka, Kanagawa, Japan;Department of Electrical Engineering, Tokyo University of Science, Noda, Chiba, Japan
Venue:
EURASIP Journal on Advances in Signal Processing - Special issue on advances in single carrier block modulation with frequency domain processing
Year:
2011

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Abstract

This paper presents a new maximum likelihood detection- (MLD-) based signal detection method for orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) multiplexing with frequency domain spreading and code multiplexing. The proposed MLD reduces the computational complexity by utilizing signal orthogonalization based on QR decomposition of the product of the channel and spreading code matrices in the frequency domain. Simulation results show that when the spreading factor and number of code multiplexed symbols are 16, the proposed MLD reduces the average received signal energy per bit-to-noise spectrum density ratio (Eb/N0) for the average packet error rate (PER) of 10-2 by approximately 12 dB compared to the conventional minimum mean-squared error- (MMSE-) based filtering for 4-by-4 MIMO multiplexing (16QAM with the rate-3/4 Turbo code is assumed).