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We propose a new low-density parity-check (LDPC) coded binary physical-layer network coding (PNC) scheme for Gaussian two-way relay channels. In this scheme, we introduce a bit mapper between the LDPC encoder and the modulator, which considers the unequal error protections brought by the high order PSK modulations. We add a new bipartite sub-channel graph consisting of sub-channels and variable nodes...
To improve the performance further for the bit- interleaved coded modulation with iterative decoding (BICM-ID) system, a modified extrinsic information transfer (EXIT) model is presented, in which the decoding and the demodulation are modeled as two iterative processing units. By using the binary erasure channel (BEC) approximation for the a priori AWGN channel, the analytical formulation of mutual...
Double binary convolutional turbo code has been adopted by 802.16m as the channel coding scheme. To decrease the decoding complexity while maintain better decoding performance, this paper proposes a decoding scheme in which a pre-processing module is inserted before the decoder. In addition, exponential computation in this module is replaced by linear approximation, and detailed steps of the processing...
This paper proposes a new and modified MAP algorithm for double binary convolutional turbo code (DB CTC) based on a new definition of branch metrics. The exponential and logarithmic operations in the convolutional algorithm are not needed in the iterative process after a date pre-processing of the received sequence. Furthermore, computational complexity analysis of branch metrics and performance simulation...
With iterative decoding, most LDPC codes have a weakness known as error floor. In this work, we propose a fixed bits LDPC decoding scheme to improve the ability of LDPC transmission. The method is universal as it can be applied to any code/channel model/decoding algorithm and it improves performance greatly, without losing the code regularity, without changing the decoding algorithm. Simulation results...
In this paper, an iterative joint decoding algorithm for low density parity check codes with BCH codes based on Chase algorithm is proposed. After a certain number of iterations, the soft output values delivered by belief propagation algorithm of LDPC codes are used as reliability values to perform Chase decoding of BCH codes. And BCH decoder also will return soft information to LDPC decoder as input...
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