STANAG 4444: improved soft-decision detector for the spread spectrum mode

2009 ◽  
Author(s):  
B. Bejar-Haro ◽  
S. Zazo-Bello ◽  
I. Perez-Alvarez ◽  
A. Quintana ◽  
J.M. Camas
Keyword(s):  
Spread Spectrum ◽  
Soft Decision

scholarly journals FPGA implementation of LDPC soft-decision decoders based DCSK for spread spectrum applications

2021 ◽  
Vol 11 (6) ◽  
pp. 4794
Author(s):  
Fadhil S. Hasan ◽  
Mahmood F. Mosleh ◽  
Aya H. Abdulhameed
Keyword(s):  
Spread Spectrum ◽  
Simple Structure ◽  
Soft Decision ◽  
Soft Data ◽  
Resource Requirement ◽  
Decoding Algorithms ◽  
Ldpc Decoding ◽  
Shift Keying ◽  
Chaos Shift Keying ◽  
Log Domain

<span lang="EN-US">Spread spectrum (SS) communications have attracted interest because of their channel attenuation immunity and low intercept potential. Apart from some extra features such as basic transceiver structures, chaotic communication would be the analog alternative to digital SS systems. Differential chaos shift keying (DCSK) systems, non-periodic and random characteristics among chaos carriers as well as their interaction with soft data are designed based on low-density parity-check (LDPC) codes in this brief. Because of simple structure, and glorious ability to <span>correct errors. Using the Xilinx kintex7 FPGA development kit, we investigate the hardware performance and resource requirement tendencies of the DCSK</span> communication system based on LDPC decoding algorithms (Prob. Domain, Log Domain and Min-Sum) over AWGN channel. The results indicate that the proposed system model has substantial improvements in the performance of the bit error rate (BER) and the real-time process. The Min-Sum decoder has relatively fewer FPGA resources than the other decoders. The implemented system will achieve 10-4 BER efficiency with 5 dB associate E<sub>b</sub>/N<sub>o</sub> as a coding gain.</span>

scholarly journals Immunity of the Data Transmission Channel with FHSS when Soft Decoding by Means of Spectral Density Estimation of Interference Power

2020 ◽  
pp. 843-854
Author(s):  
Valery P. Berdychev ◽  
Alexander A. Bliznyuk ◽  
Sergey B. Zhironkin ◽  
Andrey A. Pshenitsyn ◽  
Alexander A. Kuchin
Keyword(s):  
Spectral Density ◽  
Density Estimation ◽  
Data Transmission ◽  
Spread Spectrum ◽  
Noise Immunity ◽  
Transmission Channel ◽  
Interference Power ◽  
Soft Decision ◽  
Spectral Density Estimation ◽  
Soft Decoding

The characteristics of noise immunity of a coherent data transmission channel with Frequency Hopping Spread Spectrum (FHSS), orthogonal signals and Reed-Solomon code with its soft decoding have been obtained using spectral density estimation of interference power, which is a combination of two Gaussian noise interference, they are barrage jamming and one concentrated in the FHSS band part. It is found that when the volume of an orthogonal signals ensemble increases, noise immunity rises due to the accuracy growth of the spectral density estimation of the interference power, which in turn provides an accuracy growth of posterior probability estimation used for soft-decision decoding

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