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The article represents the most common frequency detection algorithms and shows the results of comparing Goertzel algorithms operation speed and fast Fourier transform on the 1967VN044 processor. The paper substantiates implementation of Fourier speed transform algorithms for the locomotive radio station codegram decoding.
In this paper, we investigate the combinatorial design of a new class of One-Step Majority-Logic Decodable (OSMLD) codes, based on Balanced Incomplete Block Designs of type Oval, which are derived from finite geometry. We show that the constructed OSMLD codes provides high rates in addition to good correction capacities. Simulation results shows that the proposed codes converge well under iterative...
Steganography is a form of secret communication in which a secret message (text, image) is hidden inside a carrier message (text, image). While in cryptography, the goal is to make everything unreadable to the ones who do not know the password, in steganography, on the other hand, the goal is to camouflage a message inside an apparently innocent carrier. In other words, while cryptography conceals...
The Bit-Flipping (BF) algorithm is considered as a hard decoding method for LDPC codes. It is much simpler than the probabilistic methods like Sum Product Algorithm (SPA), and can be efficiently implemented by electronic circuits. In this paper, we propose a new Bit Flipping algorithm for Low-Density Parity-Check codes (LDPC) called Single Bit-Flipping (SBF). Compared to the Gallager Bit-Flipping...
The present paper has considered multithreshold decoders for self-orthogonal codes providing a near-optimal efficiency of the error correction under linear computational complexity. New divergence principle used within construction and decoding convolutional codes has been discussed. The paper has shown that usage of such principle allows significantly approximating an area of the decoder effective...
Sparse code multiple access (SCMA) is a promising non-orthogonal multiple access scheme to support massive connectivity. In this paper, we propose a novel scheme to analyze the performance of Low-density Parity-check (LDPC) codes in SCMA systems based on density evolution (DE) theory. In particular, we develop the combination method including channel adapter and log-likelihood ratio (LLR) convertor...
In this letter, protograph based quasi-cyclic (QC) low-density parity-check (LDPC) codes are designed for multi-level cell (MLC) NAND flash memories, where the exact voltage signal values are unavailable but rather the quantized voltage signals are measured for soft decoding. Existing LDPC codes optimized for symmetric, additive white Gaussian noise (AWGN)-like channels are not optimal for flash memory...
A few years after standardization of the High Efficiency Video Coding (HEVC), now the Joint Video Exploration Team (JVET) group is exploring post-HEVC video compression technologies. In the intra prediction domain, this effort has resulted in an algorithm with 67 internal modes, new filters and tools which significantly improve HEVC. However, the improved algorithm still suffers from the long distance...
This work presents a self-adaptation algorithm to automatically adjust the peaking settings of a continuous-time linear equalizer (CTLE) in a high-speed PAM4 receiver. A statistical approach is adopted to improve the robustness and flexibility of the adaptation algorithm. The PAM4 top level distribution around the peak value of several consecutive top levels guides the CTLE to attain the optimal digital...
A parameter optimization scheme of block interleaver for polar coding with bit-interleaved coded modulation (BICM) is proposed in this paper. We analyze the characteristics of a random interleaver applied to polar codes with high-order modulation, which is ideal but infeasible to implement. Then we derive the parameter optimization algorithm of block interleaver for polar coding with BICM. The block...
In a binary input additive white Gaussian noise (BIAWGN) channel, belief propagation (BP) decoding for luby transform (LT) codes requires the knowledge of the signal-to-noise ratio (SNR) at the receiver to achieve its optimal performance. An erroneous estimation of the SNR at the decoder is referred to as “SNR mismatch”. SNR mismatch can significantly degrade the BP decoding performance of LT codes...
In this paper, we propose an algebraic approach to design extremely low rate low-density parity-check (LDPC) codes by employing the primitive polynomials. We first investigate the requirements for the polynomials to construct 4-cycle free LDPC codes and then propose an algebraic approach to design the parity check matrix. To achieve a better decoding performance in the extremely low rate region, we...
The conventional infinite-length extrinsic information transfer (EXIT) charts would not be accurate for short-length coded systems, because short-length coded sequences do not possess ergodicity as infinite-or very-long length coded sequences. In this paper, we concern with the finite-length EXIT analysis, which is developed for protograph low-density parity-check (PG-LDPC) codes over underwater acoustic...
The mobile underwater acoustic channel has brought a great challenge on the encoding and decoding process. The recent development of underwater acoustic processing method aims to get a lower bit error rate(BER). However, the controdiction between lower BER and real-time transmission are not well solved. In this paper, we reach a compromise between them, we combine the turbo code with the adaptive...
In this paper we study the initialization step of decoding algorithms for efficient error-control coding techniques, and its dependence of the channel characteristics over which transmission is performed. LDPC and Polar codes are selected as efficient error-control codes operating over different channels. Channels under study are the classic Additive White Gaussian noise channel, the Rayleigh fading...
This paper proposes a modified bit flipping algorithm and its weighted variants based on reliability derived from intrinsic information. Compared to other existing algorithms where extrinsic information based reliability was used in the flipping function, here intrinsic information based reliability is also equally considered. This algorithm only uses additions and subtractions to modify reliability...
In contemporary digital communications design, two major challenges should be addressed: adaptability and flexibility. The system should be capable of flexible and efficient use of all available spectrums and should be adaptable to provide efficient support for the diverse set of service characteristics. These needs imply the necessity of limit-achieving and flexible channel coding techniques, to...
In this paper, two novel hardware architectures based on tabled asymmetric numeral systems decoding algorithm are proposed. In the proposed architectures the decoding throughput is highly dependent on the how much the data is compressed at encoding time. The synthesis results presented here show that the throughput of the parallel architecture can reach up 200 MB/s. The benchmarks show that the parallel...
Recently, both polar codes and low-density parity-check (LDPC) codes have been adopted by 3GPP eMBB scenario. Since both codes exist in one system, it is natural to consider the concatenation scheme of them. In this paper, a merged belief propagation (BP) decoding algorithm for the concatenated codes of polar and LDPC codes is proposed. By jointing factor graphs, this merged algorithm is designed...
In this paper, minimum MSE based interference alignment (IA) algorithm is developed for the interfering broadcast channel (IBC), which models the multi-cell downlink system, underlying cognitive radio, device-to-device and other scenarios. The IA precoders and decoders are computed to minimize the MSE. Cascade design is used for IA precoder design, where the first component precoder is obtained by...
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