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We investigate the construction method of structured extended irregular repeated-accumulate quasi-cyclic low-density parity-check (SeIRA QC-LDPC) codes with short to moderate length. A new metric is proposed that jointly considers both circle length and circle connectivity, which aims to improve the error correcting performance in the error floor region. Meanwhile, iterative searching method is proposed...
A statistical-based density evolution algorithm is proposed for nonbinary low-density parity-check (LDPC) codes. It is applicable to both regular and irregular codes under study. The algorithm proposed serves as a tool to analyze the performance limit for iterative decoding of nonbinary LDPC codes, which in turn guides code design. Specifically, it provides approximated evaluations of convergence...
In traditional receivers, frequency locked loop (FLL) or phase locked loop (PLL) is used for carrier tracking. In addition, fast Fourier transform (FFT) is an alternative implementation of carrier tracking when receivers are stationary. This paper presents why those methods are unsuitable for weak signal tracking in practice and proposes an improved algorithm based on dynamic compensation and FFT...
Space-time block codes (STBC) are widely used to obtain diversity gain in multiple-input multiple-output (MIMO) channel and Turbo codes are used to provide coding gain. So here a turbo-coded STBC concatenated system, which fully exploits the diversity gain and coding gain are studied. Specially we propose an iterative decoding scheme with a soft information processor created in the system to adjust...
In order to meet the demands of complicated calculation and high real-time performance, a new implementation of multi-mode GNSS signal simulator controlled by computer is proposed. Navigation control parameters are calculated by computers. Then, they are sent to satellite signal generator via network interface to control signal generation. This combination displays strong advantages of parallel processing...
In this paper, we investigate the performance of iterative decoding for concatenated Turbo coded and Space-time block coded (STBC) system. In our proposed system the soft parity bit needs to be estimated, which differs from traditional Turbo decoding, as the receiver adopts iterative decoding not only to Turbo codes but the entire system. In this case a simplified and effective method of parity bit...
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