Signal processing of WiMAX physical layer based on low-density parity-check codes

WiMAX technology supports very high data rate, high capacity and high quality in mobile broadband wireless access system. The performance of the WiMAX system can be enhanced by incorporating a better channel coding technique. This paper presents the excellent performance channel coding known as low-density parity check (LDPC) codes which is a part of WiMAX system. A modified array code parity check matrix for LDPC encoder is used and the message passing (MP) algorithm for LDPC decoder is used, respectively. Both systems are modulated by the basic standard modulation scheme. The computer simulation results confirm that the bit error rate (BER) performance of the WiMAX system that incorporate with the powerful LDPC coding technique has been improved over the conventional standard WiMAX system. However, the computational complexity of the proposed WiMAX system is higher than the previous one.

[1]  Khaled Fazel,et al.  Multi-Carrier and Spread Spectrum Systems , 2003 .

[2]  A. G. R. G. Hanna,et al.  Development of Wimax Physical Layer Building Blocks , 2012, 2012 Third International Conference on Intelligent Systems Modelling and Simulation.

[3]  Jeffrey G. Andrews,et al.  Fundamentals of WiMAX: Understanding Broadband Wireless Networking , 2007 .

[4]  Jun Wang,et al.  A Parallel Layered Decoding Algorithm for LDPC Codes in WiMax System , 2009, 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing.

[5]  Mustafa Ergen,et al.  Mobile Broadband: Including WiMAX and LTE , 2010 .

[6]  Loutfi Nuaymi,et al.  Wimax Technology for Broadband Wireless Access , 2007 .

[7]  Sau-Gee Chen,et al.  A 1.45Gb/s (576,288) LDPC Decoder for 802.16e standard , 2007, 2007 IEEE International Symposium on Signal Processing and Information Technology.

[8]  Robert G. Gallager,et al.  Low-density parity-check codes , 1962, IRE Trans. Inf. Theory.