Design and Implementation of LDPC Encoder / Decoder in the Atmospheric Laser Communication

2014 ◽  
Vol 672-674 ◽  
pp. 883-887
Author(s):  
Li Min Chang ◽  
Qing Wei Dong ◽  
Ye Zhan
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Belief Propagation ◽  
Ldpc Codes ◽  
Bp Algorithm ◽  
Laser Communication ◽  
Coding Gain ◽  
Paper Briefly ◽  
Design And Implementation ◽  
And Performance

The paper briefly introduces the structure principle and excellent characteristics of protograph LDPC codes and designs the serial encoding circuit based on FPGA. On the basis of the further study of Belief Propagation (BP) algorithm, λ-min algorithm and A - min algorithm, decoder is designed adopting the complexity and performance eclectic mixed decoding algorithm. Meanwhile, it is verified by the simulation. The result shows that coding gain can be up to about 6 to 8 db, if it meets the requirements of 10-5bit error rate.

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

Design and Implementation of Wireless Channel Test System of UAV

2013 ◽  
Vol 380-384 ◽  
pp. 757-760
Author(s):  
Luo Jun ◽  
Lu Wen Jun ◽  
Ye Fei ◽  
Sun Shuang Xi ◽  
Pe Dong Hui
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Radio Channel ◽  
Test System ◽  
Wireless Channel ◽  
Technical Indicators ◽  
Receiver Sensitivity ◽  
Design And Implementation ◽  
The Core ◽  
Communications Systems

UAV wireless channel is the core of their communications systems, this paper designed a stepper adjustable independently programmable power attenuation device and contains three functional subsystems to achieve a radio channel test equipment for testing wireless channel launch power attenuation, receiver sensitivity and receiver bit error rate and other key technical indicators.

A Novel Construction Method of QC-LDPC Codes Based on Generalized ACE Constrained

2013 ◽  
Vol 760-762 ◽  
pp. 1684-1689
Author(s):  
Hong Hao Zhao ◽  
Fan Bo Meng ◽  
Qing Qi Zhao ◽  
Jie Wang
Keyword(s):  
Computational Complexity ◽  
Bit Error Rate ◽  
Error Rate ◽  
Ldpc Codes ◽  
Excellent Performance ◽  
Frame Error Rate ◽  
Signal Noise ◽  
Extrinsic Message Degree ◽  
Lower Complexity ◽  
Simulation Results

Recently, structured LDPC codes have been focused on due to excellent performance and lower complexity. An improved construction of QC-LDPC based on a modified PEG algorithm is proposed in this paper. The modified Progressive Edge-Growth algorithm is a PEG algorithm with Approximated Cycle Extrinsic Message Degree (ACE) metric, which is used to describe the connectivity of cycles. The approach can maximize the girth of the cycles, improve the connectivity of cycles and have the advantages of QC algorithms. The simulation results demonstrate that the PEG algorithm based on ACE has lower Bit Error Rate (BER) and Frame Error Rate (FER) than the original PEG algorithm at the low Signal Noise Ratio (SNR) values, and has a relatively lower computational complexity.

Research of Bit Error Rate for Satellite-to-Ground Laser Communication Using Circle Polarization Shift Keying Modulation

2011 ◽  
Vol 38 (11) ◽  
pp. 1105007 ◽  
Author(s):  
林日钊 Lin Rizhao ◽  
傅忠谦 Fu Zhongqian ◽  
李永亮 Li Yongliang ◽  
张虎 Zhang Hu ◽  
王剑亭 Wang Jianting
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Laser Communication ◽  
Shift Keying

scholarly journals Duty-cycle-division-multiplexing: Bit error rate estimation and performance evaluation

2009 ◽  
Vol 16 (4) ◽  
pp. 422-425 ◽  
Author(s):  
Ghafour Amouzad Mahdiraji ◽  
Mohamad Khazani Abdullah ◽  
Makhfudzah Mokhtar ◽  
Amin Malekmohammadi ◽  
Ahmad Fauzi Abas
Keyword(s):  
Performance Evaluation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Duty Cycle ◽  
Rate Estimation ◽  
And Performance
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