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Adaptive WHT Aided QAM for Fading Channels Subjected to Impulsive Noise

Adaptive WHT Aided QAM for Fading Channels Subjected to Impulsive Noise
Adaptive WHT Aided QAM for Fading Channels Subjected to Impulsive Noise
The Bit Error Rate (BER) expressions of Walsh-Hadamard Transform (WHT) aided Quadrature Amplitude Modulation (QAM) transmitted in impulsive noise environments are derived. It is found that there is a crossover point between conventional and WHT-aided schemes’ BER curves, above which WHT is beneficial in terms of the corresponding BER performance. The exact crossover SNR is analysed and its approximate closed-form expression is derived for a QPSK scheme based on the Chernoff bound. An adaptive WHT scheme is proposed for QAM systems, where the transmitter activates the WHT only when the instantaneous SNR at the receiver is higher than the crossover SNR. The theoretical BER of our adaptive WHT scheme is derived for QAM systems operating over Nakagami-m fading channels. It is found that our adaptive WHT scheme is effective in terms of mitigating the detrimental effects of impulsive noise over the entire SNR range.
Choi, Byoungjo
1a202020-ee20-4739-8889-2c74d008832e
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Choi, Byoungjo
1a202020-ee20-4739-8889-2c74d008832e
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Choi, Byoungjo and Hanzo, Lajos (2013) Adaptive WHT Aided QAM for Fading Channels Subjected to Impulsive Noise. IEEE Communications Letters. (In Press)

Record type: Article

Abstract

The Bit Error Rate (BER) expressions of Walsh-Hadamard Transform (WHT) aided Quadrature Amplitude Modulation (QAM) transmitted in impulsive noise environments are derived. It is found that there is a crossover point between conventional and WHT-aided schemes’ BER curves, above which WHT is beneficial in terms of the corresponding BER performance. The exact crossover SNR is analysed and its approximate closed-form expression is derived for a QPSK scheme based on the Chernoff bound. An adaptive WHT scheme is proposed for QAM systems, where the transmitter activates the WHT only when the instantaneous SNR at the receiver is higher than the crossover SNR. The theoretical BER of our adaptive WHT scheme is derived for QAM systems operating over Nakagami-m fading channels. It is found that our adaptive WHT scheme is effective in terms of mitigating the detrimental effects of impulsive noise over the entire SNR range.

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Accepted/In Press date: 2013
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 352208
URI: https://eprints.soton.ac.uk/id/eprint/352208
PURE UUID: ae8cc998-abb1-4f32-a9bd-d749a60f82ec
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 06 May 2013 10:54
Last modified: 13 Jun 2018 00:36

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