MMSE-prewhitened-MLD equalizer for MIMO DFT-precoded-OFDMA

Kuchi, Kiran (2012) MMSE-prewhitened-MLD equalizer for MIMO DFT-precoded-OFDMA. IEEE Wireless Communications Letters, 1 (4). pp. 328-331. ISSN 2162-2337

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A low-complexity equalizer which uses a combination of space-frequency minimum-mean-square-error-estimation (MMSE) filter and a pre-whitened maximum likelihood detector (MLD) is proposed for discrete Fourier transform precoded orthogonal frequency division multiple accesses (DFT-precoded-OFDMA) systems employing multi-stream spatial multiplexing (SM). We show that this receiver behaves like an optimum MLD in channels with low frequency selectivity (flat fading) and the performance converges to that of MMSE in channels with high frequency selectivity. Further, we analytically characterize the performance of the zero-forcing (ZF) linear equalizer (LE) in an i.i.d. channel with infinite amount of frequency selectivity for the case when the number of receiver antennas N r is greater than the number of transmitter antennas/streams N t. The ZF-LE is shown to provide a per-stream post-processing signal-to-noise-ratio (SNR) of N r-N t/N tN 0 for N r > N t. Additionally, simulation is used to compare the bit error rate (BER) performance of ZF and MMSE based receivers

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IITH Creators:
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Item Type: Article
Uncontrolled Keywords: DFT-precoded-OFDMA; equalization; MLD; MMSE; OFDM; SC-FDMA
Subjects: Physics > Electricity and electronics
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 11 Nov 2014 04:13
Last Modified: 26 Sep 2017 05:26
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