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This paper proposes a modified IMWBF decoding algorithm for low-density parity-check (LDPC) codes. In the proposed modification, the magnitude of the received signal is updated when the number of the unsatisfied parity-check equations participated by this received signal is larger than a predetermined threshold. Through this modification, the outlier, defined as the undesired large-magnitude received...
This letter proposes a flexible construction method of nonbinary protograph-based low-density parity-check codes based on finite field additive group operation from node perspective. First, nonzero element labels of nodes are optimized by minimum distance of corresponding binary image of rows of the parity-check matrix. Then, quasi-girth calculating method is proposed to jointly optimize node permutation...
To verify the performance of communication systems, software and hardware prototypes are widely used. However, with the increasing complexity of communication systems, software prototypes cannot meet the needs of real-time operations while hardware prototypes are expensive and time-consuming to develop. Nowadays, Graphics Processing Unit (GPU) shows great prospect as a coprocessor and has the capability...
Non-full spreading space-time block code(NFS-STBC) means the time period of one block is less than the number of transmit antennas($s<n_t$). NFS-STBC, compared with the conventional full spreading STBC(FS-STBC), have higher transmission rate but usually lower diversity order. In this paper, by considering the combination of STBC with bit- interleaved coded QAM modulations(BICM) systems, we propose...
It is well known that Space-Time Block Codes from orthogonal designs (O-STBC) are linearly Maximum-Likelihood (ML) decodable. However there are not full rate complex O-STBC designs except for two transmit-antennas. Recently, one class of minimum-decoding-complexity STBCs (MDC-STBC) have been studied: (1) they have higher rate than O-STBC; (2) they are single-symbol decodable (SSD) and (3) they can...
This paper presents a 3.3kbps Characteristic Waveform Interpolation (CWI) speech coding algorithm based on biorthogonal Wavelet Transform (WT). The amplitude spectral surface of characteristic waveforms is decomposed into a series of reduced time resolution surfaces with B-spline biorthogonal wavelet filter banks. This multi-scale characteristic leads to more efficient quantization by exploiting each...
This paper presents a multi-input multi-output (MIMO) detector that combines probability data association (PDA) and sphere decoding (SD) algorithms. Because of the PDA's natural soft output, soft interference cancellation (SIC) idea is taken to improve the performance. In the presented combining scheme, two different iterative stopping criterions for PDA's module are discussed. Simulation results...
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