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Lookup NU author(s): Emeritus Professor Rolando Carrasco, Professor Jeffrey Neasham
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Broadband fixed wireless access (BFWA) systems enable services such as high-speed data communication, high quality voice/video conferencing and high-speed internet access in areas where a wired link is not possible. However, the BFWA channel is a slow-fading channel having deep frequency-selective fading caused by clusters of scatterers in the environment that introduce inter-symbol interference (ISI) at the receiver. Low density parity check (LDPC) codes, optimised for the single-input single-output BFWA channel, are designed using the structured balance incomplete block design method. The use of both quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) are investigated theoretically. To help overcome the ISI effects of the channel, equalisation techniques are employed separately with LDPC decoding for a system employing QPSK and 16-QAM modulation schemes. The equaliser single carrier approach is then replaced with orthogonal frequency division multiplexing (OFDM) and the performance of these two approaches is evaluated in terms of bit-error rate. The simulation results show that equalisation with LDPC coding has a measurable performance gain over LDPC coding with OFDM.
Author(s): Khan MK, Carrasco RA, Wassell IJ, Neasham JA
Publication type: Article
Publication status: Published
Journal: IET Communications
Year: 2008
Volume: 2
Issue: 2
Pages: 272 - 283
ISSN (print): 1751-8628
ISSN (electronic): 1751-8636
Publisher: The Institution of Engineering and Technology
URL: http://dx.doi.org/10.1049/iet-com:20050587
DOI: 10.1049/iet-com:20050587
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