By establishing a single parity check relationship between convolutional codewords, a concatenated code, termed single parity check convolutional code (SPC-CC), is proposed. By jointly en/decoding the SPC and CC, as w...
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ISBN:
(纸本)9780738124766
By establishing a single parity check relationship between convolutional codewords, a concatenated code, termed single parity check convolutional code (SPC-CC), is proposed. By jointly en/decoding the SPC and CC, as well as carefully allocating redundant information between the pair, we can improve BER more promptly during iterative decoding. Each codeword in SPC-CC consists of only one SISO decoder, which generates one extrinsic information. The key is to simulate another using extrinsic information from other decoders. Then iteratively feed back extrinsic information to each other in a manner similar to a Turbo engine. We design en/decoding scheme of the SPC-CC, and then analyze its performance and complexity. Simulation results show that SPC-CC can effectively improve communication reliability with a moderate complexity. In addition, thanks to SPC code, SPC-CC can correct packet erasures due to fading or interference.
Highly Reliable Communication (HRC) is an emerging paradigm for meeting the quality of service requirements of new applications such as intelligent vehicle networking and industrial Internet. HRC brings challenges to ...
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Highly Reliable Communication (HRC) is an emerging paradigm for meeting the quality of service requirements of new applications such as intelligent vehicle networking and industrial Internet. HRC brings challenges to channel coding and multiple access. Various channel coding techniques have been proposed to improve reliability, but often suffer from limited reliability and high decoding complexity. This work presents a double serial concatenated code using CRC-aided error correction, abbreviated as (DSCEC)-E-3, to improve reliability and reduce complexity. The encoding scheme is a double serial concatenated code, with the cascade of a set of CRC encoders, a linear block encoder, a series of interleavers, and a set of convolutional encoders. The decoding scheme consists of two modules: (i) decoding of serial concatenated codes, which includes the decoding of single parity check convolutional code (SPC-CC) and the decoding of Reed-Solomon convolutional code (RSCC) for intra-block error correction at the physical layer to control BER;(H) decoding of CRC-aided linear error correction, which can effectively identify, locate and correct error bits at the inter-block level to solve the problem of block loss caused by residual errors at the physical layer. Simulation results show that the joint scheme can effectively improve communication reliability while reducing complexity.
Our paper introduces a typical concatenated code, analyzes its performance about the error correcting capability and possible vulnerability. Moreover, an error pattern is proposed based on its coding structure. We als...
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ISBN:
(纸本)9781538635735
Our paper introduces a typical concatenated code, analyzes its performance about the error correcting capability and possible vulnerability. Moreover, an error pattern is proposed based on its coding structure. We also made a simulation to compare the influence to the decoding performance of concatenated code between the proposed error pattern and the traditional random error patterns. The simulation results show that the effect degree of erroneous pattern proposed on the concatenated code is higher than that of the random error pattern.
Frequency hopping (FH) is a widely employed communication technique for countering jamming. However, the robustness can significantly degrade when jamming signals align with the hopping frequencies. To address this is...
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This letter presents an RS-SPC concatenated code blindrecognition algorithm based on the single-error correction. The algorithm corrects the least reliable bit of the single parity check (SPC) codewords based on the p...
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This letter presents an RS-SPC concatenated code blindrecognition algorithm based on the single-error correction. The algorithm corrects the least reliable bit of the single parity check (SPC) codewords based on the parity check characteristics, thereby increasing correct Reed-Solomon (RS) codewords and laying the foundation for improving the recognition probability. In addition, this algorithm combines threshold judgement with the matrix recording method, thereby eliminating unnecessary iterative operations under the condition that accurate recognition is possible. At the same time, it employs probability theory as a theoretical basis to quantify the degree of dispersion of the data through sample variance. The experimental results demonstrate that the recognition probability of this algorithm is superior to that of all other algorithms. When the codeword error rate (CER) is 0.5, RS(15,9)-SPC(4,3) still has a recognition probability of 20%. For RS(255,239)-SPC(8,7), the gain of the proposed algorithm exceeds 1.3dB compared to the upper bound of the recognition probability.
In most practical quantum mechanical systems,quantum noise due to decoherence is highly biased towards *** quantum state suffers from phase flip noise much more seriously than from the bit flip *** this work,we constr...
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In most practical quantum mechanical systems,quantum noise due to decoherence is highly biased towards *** quantum state suffers from phase flip noise much more seriously than from the bit flip *** this work,we construct new families of asymmetric quantum concatenated codes(AQCCs)to deal with such biased quantum *** construction is based on a novel concatenation scheme for constructing AQCCs with large asymmetries,in which classical tensor product codes and concatenated codes are utilized to correct phase flip noise and bit flip noise,*** generalize the original concatenation scheme to a more general case for better correcting degenerate ***,we focus on constructing nonbinary AQCCs that are highly *** to previous literatures,AQCCs constructed in this paper show much better parameter performance than existed ***,we design the specific encoding circuit of the *** is shown that our codes can be encoded more efficiently than standard quantum codes.
In this paper, a concatenated low-density-parity-check (LDPC) coding scheme that is suitable for iterative soft decoding is introduced for magnetic recording systems. The concatenated code is constructed as the produc...
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ISBN:
(纸本)9781479973231
In this paper, a concatenated low-density-parity-check (LDPC) coding scheme that is suitable for iterative soft decoding is introduced for magnetic recording systems. The concatenated code is constructed as the product of two linear codes, in which a conventional 4 kB LDPC code is used as the inner code and a single-parity check code serves as the outer code. The outer code in this concatenated construction spans many sectors, possibly an entire track, and the code rate and the block size can be flexibly configured. While individual sectors can be read and decoded independently, the full decoding power of the concatenated code can only be achieved by reading all the data sectors that are involved in the outer code. The concatenated code produces significant signal-to-noise gain over the baseline 4 kB LDPC. The soft decoding for the single-parity check code is very simple compared with the 4 kB LDPC code, and the concatenated code has a similar decoding complexity as the baseline 4 kB LDPC code. When the individual sectors within the outer code are updated in place, a read-modify-write procedure must be employed.
This letter introduces a novel concatenation decoding of Reed-Solomon (RS) codes with single parity-check product codes (SPC-PCs), including the concatenation scheme and the decoding algorithm. The proposed scheme seq...
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This letter introduces a novel concatenation decoding of Reed-Solomon (RS) codes with single parity-check product codes (SPC-PCs), including the concatenation scheme and the decoding algorithm. The proposed scheme sequentially arranges SPC-PCs to form $K$ information symbols, then encodes them into $N$ symbols using systematic RS code. A high-performance and low-complexity bit-iterative-update decoding (BIUD) algorithm is also proposed based on this scheme. We use the results of the parity-check to evaluate the reliability in each dimension and then iteratively update the reliability of each bit based on the structure of SPC-PCs. This way dramatically reduces the complexity of traditional reliability computation. Furthermore, the bit iterative update and the Berlekamp-Massey algorithm of RS codes can be well combined, resulting in more accurate results. The simulation and analysis results show that the proposed concatenation algorithm has significant performance improvement compared to the current RS-SPC concatenation decoding while having extremely low complexity.
Multi Carrier Direct Sequence code Division Multiple Access(MC DS CDMA) technique is the future generation mobile communication system and to access technology in future advances. Serial and Parallel concatenated code...
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ISBN:
(纸本)9781479933587
Multi Carrier Direct Sequence code Division Multiple Access(MC DS CDMA) technique is the future generation mobile communication system and to access technology in future advances. Serial and Parallel concatenated codes are used for correcting the errors in data transmission. We proposed hybrid concatenated code for MC DS CDMA structure and estimate parameters like memory and design time. Use of interleavers are reduce the burst errors between outer and inner code of encoding and decoding operation in the MC DS CDMA model. Modelsim synthesis technology used for simulate the entire model and Verilog Hardware Description Languages (HDL) are used for design the codes of MC DS CDMA systems.
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