The research on channel coding of shortwave Automatic Link Establishment communication system

2011 ◽  
Author(s):  
Jian Luo ◽  
Hongwei Zhou ◽  
Yingjie Wu ◽  
Yun Wang
Keyword(s):  
Communication System ◽  
Channel Coding

Research on LDPC channel coding technology in satellite communication system

2021 ◽  
Author(s):  
Shikang Nie ◽  
Guangting Li ◽  
Xin Liu ◽  
Xin Zhang ◽  
Chenchen Lin ◽  
...  
Keyword(s):  
Communication System ◽  
Channel Coding ◽  
Satellite Communication ◽  
Satellite Communication System

Rate Compatible LDPC Codes Design for Shallow Water Acoustic Communications

2012 ◽  
Vol 198-199 ◽  
pp. 1609-1614
Author(s):  
You Gan Chen ◽  
Xiao Mei Xu ◽  
Lan Zhang
Keyword(s):  
Shallow Water ◽  
Communication System ◽  
Channel Coding ◽  
Error Control ◽  
Signal To Noise Ratio ◽  
Estimation Error ◽  
Ldpc Codes ◽  
Temporal Variations ◽  
Channel Characteristics ◽  
Wide Range

The fast temporal variations shallow water acoustic (SWA) channels need the temporal variations channel coding scheme at the acceptable cost. Hence, flexible channel coding rate, adjusted according to different ocean channel characteristics, should be desired in the design of practical error control SWA communication system. In this paper, we propose rate-compatible LDPC (RC-LDPC) codes to improve the communication system reliability for SWA communications. The proposed SWA system adopting RC-LDPC codes consists of three important preprocessing: channel state information (CSI) estimator, signal-to-noise ratio (SNR) estimator and RC-LDPC pattern. For the estimation error, we define and derive the sensitivity to imperfect CSI and imperfect SNR. Then the design of RC-LDPC codes and SWA channel profile are described. Furthermore, the RC-LDPC performance pattern is given and sensitivity to estimation error of CSI and SNR are analyzed via simulation. It is shown that RC-LDPC codes have good performances with wide range of rates in SWA channels. Finally, coding rate distributions of RC-LDPC codes in different SNR at BER below 10-4 for SWA channel are investigated.

Diver Communication System Based on Underwater Optical Communication

2014 ◽  
Vol 621 ◽  
pp. 259-263 ◽  
Author(s):  
Shuo Chen ◽  
Jun Lei Song ◽  
Zi Min Yuan ◽  
Yang Liu ◽  
Pei Pei Guo
Keyword(s):  
Optical Communication ◽  
Communication System ◽  
Channel Coding ◽  
High Performance ◽  
Visible Light Communication ◽  
Signal Acquisition ◽  
Optical Signals ◽  
Light Reduction ◽  
Communication Device ◽  
And Storage

The underwater diver visible light communication system integrating information collection, transmission and processing achieves the optical communication device established for the diver’s underwater wireless transmission and underwater sensor network. The front-end signal acquisition module capable of carrying out voice and image acquisition utilizes a MEMS digital microphone and a high performance CMOS camera to change optical signals in to digital ones. The signal source applies wavelet conversion and the channel coding and decoding apply Turbo algorithms, channel modulation and demodulation adopt PPM modulation, so compression, coding and modulation are mounted on TI's high-performance DSP TMS320DM642 platform to ensure the stability and reliability of data transmission. Back-end data acquisition module utilizes a photomultiplier tube and its peripheral circuits for receiving and converting optical signals. Display and storage modules are TFT and SD cards to achieve data reception and sound and light reduction and storage functions.

Sign in / Sign up

Export Citation Format

Share Document