Performance limits of conventional and widely linear DFT-precoded-OFDM receivers in wideband frequency-selective channels

Kuchi, K (2014) Performance limits of conventional and widely linear DFT-precoded-OFDM receivers in wideband frequency-selective channels. EURASIP Journal on Wireless Communications and Networking, 2014. pp. 1-18. ISSN 1687-1472

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Abstract

This paper describes the limiting behavior of linear and decision feedback equalizers (DFEs) in single/multiple antenna systems employing real/complex-valued modulation alphabets. The wideband frequency-selective channel is modeled using a Rayleigh fading channel model with infinite number of time domain channel taps. Using this model, we show that the considered equalizers offer a fixed post detection signal-to-noise ratio (post-SNR) at the equalizer output that is close to the matched filter bound (MFB). General expressions for the post-SNR are obtained for zero-forcing (ZF)-based conventional receivers as well as for the case of receivers employing widely linear (WL) processing. Simulation is used to study the bit error rate (BER) performance of both minimum-mean-square-error (MMSE) and ZF-based receivers. Results show that the considered receivers advantageously exploit the rich frequency-selective channel to mitigate both fading and inter-symbol interference (ISI) while offering a performance comparable to the MFB.

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IITH Creators:
IITH CreatorsORCiD
Kuchi, KUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Bit error rate; Decision feedback equalizers; Fading channels; Frequency selective fading; Matched filters; Mean square error; Orthogonal frequency division multiplexing; Rayleigh fading; Signal receivers
Subjects: Others > Electricity
Divisions: Department of Electrical Engineering
Depositing User: Library Staff
Date Deposited: 24 Mar 2015 11:40
Last Modified: 24 Mar 2015 11:40
URI: http://raiith.iith.ac.in/id/eprint/1378
Publisher URL: http://dx.doi.org/10.1186/1687-1499-2014-159
OA policy: http://www.sherpa.ac.uk/romeo/issn/1687-1472/
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