Adaptive Rate-Compatible Non-Binary LDPC Coding Scheme for the B5G Mobile System

This paper studies an adaptive coding scheme for B5G (beyond 5th generation) mobile system-enhanced transmission technology. Different from the existing works, the authors develop a class of rate-compatible, non-binary, low-density parity check (RC-NB-LDPC) codes, which expresses the strong connection between the algebra-based and graph-theoretic-based constructions. The constructed codes can not only express rate-compatible (RC) features, but also possess a quasi-cyclic (QC) structure that facilitates the encoding implementation. Further, in order to achieve the code rate-adaptive allocation scheme, the authors propose using the K-means++ clustering algorithm to cluster different channel environments, considering various factors that affect channel characteristics. Finally, in order to present the advantages of the adaptive coding scheme, the authors construct a coding scheme for image transmission. The numerical results demonstrate that the developed code can obtain better waterfall performance in a larger code rate range, which is more suitable for data transmission; the adaptive coding transmission scheme can obtain higher reconstructed image quality compared to the fixed code rate-coding scheme. Moreover, when considering unequal error protection (UEP), the proposed scheme can further improve the reconstructed image quality.

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AN EFFICIENT PROGRESSIVE IMAGE TRANSMISSION SCHEME FOR CHINESE CALLIGRAPHY

International Journal of Pattern Recognition and Artificial Intelligence ◽

10.1142/s0218001406005083 ◽

2006 ◽

Vol 20 (07) ◽

pp. 1077-1092 ◽

Cited By ~ 1

Author(s):

CHING-YUN CHANG ◽

IUON-CHANG LIN

Keyword(s):

Image Quality ◽

Response Time ◽

Image Data ◽

Image Transmission ◽

The Other ◽

Transmission Time ◽

Transmission Scheme ◽

Chinese Calligraphy ◽

High Image Quality ◽

Progressive Image Transmission

We invented a progressive image transmission scheme that is used for transmitting Chinese calligraphy. The scheme employs the property of simple colors of calligraphy images to design a method of transmitting images phase by phase. Overall, our scheme can achieve the following two goals. One is compressing the image data to reduce the transmission time while the other is gaining less response time by using progressive image transmission. Furthermore, the recovered image still maintains the colors of the seals with high image quality.

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A Simple Prediction Method for Progressive Image Transmission

Distributed Multimedia Databases ◽

10.4018/978-1-930708-29-7.ch016 ◽

2002 ◽

pp. 262-272 ◽

Cited By ~ 1

Author(s):

Chin-Chen Chang ◽

Guang-Xue Xiao ◽

Tung-Shou Chen

Keyword(s):

Image Quality ◽

Linear Prediction ◽

Prediction Method ◽

Image Transmission ◽

Input Image ◽

Reconstructed Image ◽

Progressive Image Transmission ◽

Intuitive Method

BPM is a simple and intuitive method to implement the progressive image transmission. However, its reconstructed image quality at each of the beginning stages is not good. In this paper, we propose a simple prediction method to improve the quality of the reconstructed image for BPM at each of the beginning stages. By partitioning the input image into smaller blocks, our method transmits an important part of the pixel information of each block to the receiver in each stage. To reconstruct the whole image, the receiver recovers the missing pixel information in each block by linear prediction based on the transmitted pixel information. The experiment results show that our method can significantly improve the reconstructed image quality at each of the beginning stages compared to the BPM and IBPM proposed previously.

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Study on an Adaptive Distributed Linear Dispersion Code

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.416-417.1633 ◽

2013 ◽

Vol 416-417 ◽

pp. 1633-1638 ◽

Cited By ~ 1

Author(s):

Yu Li ◽

Wei Liu

Keyword(s):

Channel Capacity ◽

Information Rate ◽

Transmission Scheme ◽

Channel State ◽

Linear Dispersion ◽

Adaptive Coding ◽

Coding Scheme ◽

Modulation Type ◽

System Information ◽

Simulation Results

An adaptive distributed linear dispersion code is proposed in this article. In the first place, each relay code selects modulation type adaptively according to channel capacity. Then the candidate dispersion matrixes are selected based on the channel state weight. Finally the best transmission scheme is selected according to the system information rate and reliability. Simulation results show that the proposed adaptive coding scheme gives a more good performance.

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