As one of the potential key technologies of 6G, semantic communication is still in its infancy and there are many open problems, such as semantic entropy definition and semantic channel coding theory. To address these...
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It is a known problem that deep-learning-based end-to-end (E2E) channel coding systems depend on a known and differentiable channel model, due to the learning process and based on the gradient-descent optimization met...
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Alpha channel is being applied in an increasing number of mobile web applications on mobile devices that require ultra-low power consumption in all cases including compute-intensive video encoding and decoding. Thus, ...
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Alpha channel is being applied in an increasing number of mobile web applications on mobile devices that require ultra-low power consumption in all cases including compute-intensive video encoding and decoding. Thus, we propose an ultra-low coding complexity and high efficiency alpha channel lossless coding approach. A novel coding framework and four new coding schemes are proposed for alpha channel coding. The framework fuses a string matching technique and a proposed prediction coding scheme named bit-depth preserving prediction (BDPP) together to reduce the correlations within and between repeated identical patterns and neighboring pixels. To achieve a good tradeoff between complexity and efficiency, either the unmatchable bytes are coded directly or the BDPP residuals of unmatchable bytes are coded by a proposed bytewise entropy coding scheme named 0.5-1-2byte-size-code. The other string matching parameters are coded by another proposed bytewise entropy coding scheme named byte-size multi-variable-length-code. To speed up the string-matching search, we apply a fast string search scheme that combines special position search and hash-based search. For the selected typical 236 alpha test images, compared with x265 in the fastest configuration and lossless mode, the proposed lossless approach achieves 14.33% less total compressed bytes with only 2.75% encoding and 1.83% decoding runtime. The proposed approach also outperforms the conventional lossless coding techniques such as LZ4HC, ZLIB, and PNG.
The channel coding structure classification based on the traditional method usually requires the coding type and prior knowledge to be known, which is completely invalid for the unknown signals that are usually interc...
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Synthetic biology has utilised engineering concepts for the rational design of biocompatible systems. Here we utilise two bacterial populations to create a modulated molecular channel coding scheme for molecular commu...
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The article studies the efficiency of channel codes coding. The study covered issues related to determining the energy gain of coding. For this purpose, turbo codes, LDPC codes, polar codes were compared. The work con...
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In today's fast paced world, the demand for Mobile Internet is increasing day by day. The fourth generation (4G) systems are now in use world-wide. The present day's 4G LTE has some challenges left such as hig...
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This paper focuses on the forward error correction(FEC),the basic parameters determination of the RS convolution code,Turbo code and the LDPC code,and the corresponding encoding and decoding algorithm in power line co...
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This paper focuses on the forward error correction(FEC),the basic parameters determination of the RS convolution code,Turbo code and the LDPC code,and the corresponding encoding and decoding algorithm in power line communication(PLC)*** experiment which is designed for narrow-band power line communication system based on OFDM is *** coding using RS convolution code,Turbo code and LDPC code are compared,and further it is determined that which encoding method is more suitable for power line communication in China.
Recently, the joint design of the GNSS message structure and the associated channel-coding scheme have been investigated as a means to reduce the Time-To-First-Fix (TTFF) and particularly the time to retrieve the Cloc...
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Recently, the joint design of the GNSS message structure and the associated channel-coding scheme have been investigated as a means to reduce the Time-To-First-Fix (TTFF) and particularly the time to retrieve the Clock and Ephemerides Data (CED). In this context, a new method to co-design the navigation message and the channel-coding scheme structure is proposed in this paper. This new co-design enables us to reduce the time to retrieve the CED while enhancing error-correction capabilities under degraded channel conditions. In order to fulfill such requirements, some structured coding schemes are designed, which provide both maximum distance separable (MDS) and full diversity properties under a non-ergodic channel assumption.
Although 4G (fourth generation) i.e. LTE (long term evolution) systems are now in use world-wide. But today's 4G systems have some challenges left such as spectrum scarcity and energy efficiency. The prime objecti...
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Although 4G (fourth generation) i.e. LTE (long term evolution) systems are now in use world-wide. But today's 4G systems have some challenges left such as spectrum scarcity and energy efficiency. The prime objectives of near-by-future 5G (fifth generation) wireless communications are reliability, higher data rate, higher bandwidth, high spectrum efficiency, higher energy efficient and that too at lower latency. channel coding tend to increase the reliability of the wireless communications system by adding extra bits in a controlled fashion and is considered to be most persuasive element of communication system. 4G LTE Turbo Codes have already been replaced by LDPC (low density parity check) Codes in many of the standards including mMTC (massive machine type communication), D2D (device to device communication) and URLLC (ultra-reliable low latency reliable communications). LDPC Codes and Polar Codes are securing much more observation because of their inherent advantages of excellent bit-error-rate performance, fast encoding and decoding procedures;which make them the strong contenders for 5G channel Codes too. This paper provides the broad survey and comparison of the LDPC and Polar Codes along with their advantages and drawbacks which will aid in further improvement of the next generation wireless networks. In order to enlighten future research possibilities in this direction, issues addressed by distinct researchers have been explored too.
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