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A compact construction for nonbinary low-density parity-check (LDPC) codes over GF(q) (q>2) using permutation polynomials (PPs) is proposed in this paper. Following the previous compact construction for binary LDPC codes using quadratic permutation polynomials (QPPs) over integer rings, a QPP whose coefficients are chosen for maximizing the girth is used for determining all the positions of nonzero...
It is known that the signal to noise ratio (SNR) mismatch may cause degradation in error correction performance of turbo decoding. In order to obtain desired coding gain, a turbo decoder can perform online SNR estimation from the received data in each code block. This paper presents a novel SNR estimation method for turbo decoding over Rayleigh fading channels by utilizing the estimate ratio of the...
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