BER EVALUATION OF LDPC CODES WITH GMSK IN NAKAGAMI FADING CHANNELJournal: ICTACT Journal on Communication Technology (IJCT) (Vol.1, No. 2)
Publication Date: 2010-06-01
Authors : Surbhi Sharma; Rajesh Khanna;
Page : 113-117
Keywords : Channel Codes; LDPC; Density Evaluation; GMSK; Nakagami Fading;
LDPC codes (Low Density Parity Check Codes) have already proved its efficacy while showing its performance near to the Shannon limit. Channel coding schemes are spectrally inefficient as using an unfiltered binary data stream to modulate an RF carrier that will produce an RF spectrum of considerable bandwidth. Techniques have been developed to improve this bandwidth inefficiency or spectral efficiency, and ease detection. GMSK or Gaussian-filtered Minimum Shift Keying uses a Gaussian Filter of an appropriate bandwidth so as to make system spectrally efficient. A Nakagami model provides a better explanation to less and more severe conditions than the Rayleigh and Rician model and provide a better fit to the mobile communication channel data. In this paper we have demonstrated the performance of Low Density Parity Check codes with GMSK modulation (BT product=0.25) technique in Nakagami fading channel. In results it is shown that average bit error rate decreases as the ‘m’ parameter increases (Less fading).
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