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.

This is the latest version of this item.


[img] PDF
Download (611Kb)


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 > Southampton Wireless Group
ePrint ID: 257020
Accepted Date and Publication Date:
June 1991Published
Date Deposited: 10 Dec 2002
Last Modified: 31 Mar 2016 13:57
Further Information:Google Scholar

Available Versions of this Item

  • Bandwidth Efficient QAM Schemes for Rayleigh Fading Channels. (deposited 10 Dec 2002) [Currently Displayed]

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics