High rate LDPC codes using OFDM and equalisation techniques for WiMAX systems

Authors:
M. K. Khan;R. A. Carrasco;I. J. Wassell
Affiliations:
School of Electrical, Electronics and Computer Engineering, University of Newcastle-upon-Tyne, Newcastle-upon-Tyne, UK;School of Electrical, Electronics and Computer Engineering, University of Newcastle-upon-Tyne, Newcastle-upon-Tyne, UK;Digital Technology Group, Computer Laboratory, University of Cambridge, Cambridge, UK
Venue:
ELECTRO'06 Proceedings of the 4th WSEAS International Conference on Electromagnetics, Wireless and Optical Communications
Year:
2006

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Abstract

In areas lacking pre-existing physical cable or telephone networks, WiMAX could allow broadband access that has previously been unavailable. However, the physical limitations of wireless medium still present a fundamental technical challenge to reliable communication and throughput. Thus, the future wireless broadband network requires greater capacity, more data throughput, low latency, improvements in coverage etc. This can be achieved by using advance modulation, coding and equalisation techniques to effectively reduce the adverse effects introduced by wireless medium. To help overcome the undesirable effects of the channel, equalisation techniques can be used in conjunction with high rate LDPC codes using QPSK modulation scheme. The equaliser single carrier approach is then replaced with an orthogonal frequency division multiplexing (OFDM) and the performance of these two approaches is evaluated in terms of bit-error rates. The simulation result shows that equalisation with LDPC decoding has a measurable performance gain over LDPC coding with OFDM, but at the cost of increased computational complexity.