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Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels

Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels
Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels
Techniques to improve the BER performance of 16-level QAM transmission over Rayleigh fading channels for PCM systems are presented, simulations were carried out with a carrier frequency of 1.9GHz, data rate of 64 kbit/s and mobile speed of 30mph. The residual BER was reduced by over an order of magnitude, by introducing circular constellation coupled differential amplitude and phase encoding, compared with a square QAM constellation. When an oversampling and interpolation technique was combined with circular constellation with differential encoding another order of magnitude reduction in residual BER was obtained. By expanding the number of QAM levels to 64, and on using the two extra bits gained for block coding, the BER was reduced 10-6 for channel SNRs in excess of 35 dB. Decreasing the data throughput to 48 kbit/s using 3/4 rate RS(60, 44, 12) code, 16 level QAM, interleaved over 40ms, transmitted over a Rayleigh fading channel yielded a BER of 10-6 for channel SNRs above 25 dB.
169-175
Webb, W T
c2a88b7b-d36a-4e48-a396-58c788ffd177
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3
Webb, W T
c2a88b7b-d36a-4e48-a396-58c788ffd177
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Steele, R
7035a3e5-8a4c-434b-a105-46fe2d63d5c3

Webb, W T, Hanzo, L and Steele, R (1991) Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels. IEE Proceedings, Part I, 138 (3), 169-175.

Record type: Article

Abstract

Techniques to improve the BER performance of 16-level QAM transmission over Rayleigh fading channels for PCM systems are presented, simulations were carried out with a carrier frequency of 1.9GHz, data rate of 64 kbit/s and mobile speed of 30mph. The residual BER was reduced by over an order of magnitude, by introducing circular constellation coupled differential amplitude and phase encoding, compared with a square QAM constellation. When an oversampling and interpolation technique was combined with circular constellation with differential encoding another order of magnitude reduction in residual BER was obtained. By expanding the number of QAM levels to 64, and on using the two extra bits gained for block coding, the BER was reduced 10-6 for channel SNRs in excess of 35 dB. Decreasing the data throughput to 48 kbit/s using 3/4 rate RS(60, 44, 12) code, 16 level QAM, interleaved over 40ms, transmitted over a Rayleigh fading channel yielded a BER of 10-6 for channel SNRs above 25 dB.

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Published date: June 1991
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 257020
URI: http://eprints.soton.ac.uk/id/eprint/257020
PURE UUID: 09f9d402-899b-4e4e-a741-8897c11eb4a3
ORCID for L Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 10 Dec 2002
Last modified: 18 Mar 2024 02:33

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Contributors

Author: W T Webb
Author: L Hanzo ORCID iD
Author: R Steele

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