Study of the Concatenation of Irregular LDPC Code with Equalizer of Low Complexity for 4G Mobile Wireless Network (Study of the Concatenation of Irregular LDPC Code with Equalizer of Low Complexity for 4G Mobile Wireless Network)

Washington Fernández Ravanales (wfernand@ubiobio.cl)


Universidad del Bio Bio
This paper appears in: Revista IEEE América Latina

Publication Date: Dec. 2011
Volume: 9,   Issue: 7 
ISSN: 1548-0992


Abstract:
A communication system for wireless networks mobile using irregular LDPC code and equalizer of low complexity is proposed. The transmitter uses irregular LDPC code with a low error threshold. The receiver uses the sum-product decoding algorithm and low complexity equalization with a maximum likelihood sequence estimation algorithm to achieve a big decrease of the error probability. The communication system is simulated on an AWGN channel and fast fading with Rayleigh distribution for different word sizes. A speed of 150 Km/H to the mobile is considered. The results shows with the system proposed a big gain is achieved. For example, using irregular LDPC only in the receptor, to achieve a BER of 10-6 a SNR of 16 dB is necessary while using LDPC code with equalizer, to achieve a BER of 10-6 a SNR of 7.3 dB is necessary only, achieving a gain of SNR of 8.7dB.

Index Terms:
Irregular Low Density Parity Check Code, Equalizer, fast fading   


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