NDLI: Large MIMO Systems: A Low-Complexity Detector at High Spectral Efficiencies

Content Provider	IEEE Xplore Digital Library
Author	Mohammed, S.K. Vardhan, K.V. Chockalingam, A. Rajan, B.S.
Copyright Year	2008
Description	Author affiliation: Dept. of ECE, Indian Inst. of Sci., Bangalore (Mohammed, S.K.; Vardhan, K.V.; Chockalingam, A.; Rajan, B.S.)
Abstract	We consider large MIMO systems, where by 'large' we mean number of transmit and receive antennas of the order of tens to hundreds. Such large MIMO systems will be of immense interest because of the very high spectral efficiencies possible in such systems. We present a low-complexity detector which achieves uncoded near-exponential diversity performance for hundreds of antennas in V-BLAST (i.e., achieves near SISO AWGN performance in a large MIMO fading environment) with an average per-bit complexity of just $0(N_{t}N_{r}),$ where $N_{t}$ and $N_{r}$ denote the number of transmit and receive antennas, respectively. With an outer turbo code, the proposed detector achieves good coded bit error performance as well. For example, in a 600 transmit and 600 receive antennas V-BLAST system with a high spectral efficiency of 200 bps/Hz (using BPSK and rate-1/3 turbo code), our simulation results show that the proposed detector performs close to within about 4.6 dB of the theoretical capacity. We also adopt the proposed detector for the low-complexity decoding of high-rate non-orthogonal space- time block codes (STBC) from division algebras (DA). We have decoded the 16x16 full-rate STBC from DA using the proposed detector and show that it performs close to within about 5.5 dB of the capacity using 4-QAM and rate-3/4 turbo code at a spectral efficiency of 24 bps/Hz. The practical feasibility of the proposed high-performance low-complexity detector could trigger wide interest in the implementation of large MIMO systems.
Starting Page	3839
Ending Page	3845
File Size	211604
Page Count	7
File Format	PDF
ISBN	9781424420759
DOI	10.1109/ICC.2008.721
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Detectors Receiving antennas Turbo codes Decoding Transmitting antennas AWGN Fading Binary phase shift keying Block codes
Content Type	Text
Resource Type	Article

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