Publication

Performance Comparison of LDPC Codes using SRK Equalisation and OFDM Techniques for Broadband Fixed Wireless Access Systems (2008)

Author(s): Khan MK; Carrasco RA; Wassell IJ; Neasham JA

    Abstract: 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.

      • Date: 25-03-2008
      • Journal: IET Communications
      • Volume: 2
      • Issue: 2
      • Pages: 272 - 283
      • Publisher: The Institution of Engineering and Technology
      • Publication type: Article
      • Bibliographic status: Published
      Staff

      Emeritus Professor Rolando Carrasco
      Emeritus Professor