Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels


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.

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Description/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 magnitutde, 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.

Item Type: Article
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 257020
Date Deposited: 10 Dec 2002
Last Modified: 27 Mar 2014 19:59
Further Information:Google Scholar
ISI Citation Count:84
URI: http://eprints.soton.ac.uk/id/eprint/257020

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