Performance of systematic distance-4 codes in free-space optical communication system
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Tarih
2017
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Int Journal Computer Science & Network Security-Ijcsns
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this paper, we reconfigured the SD-4 code with both: long and very long code lengths. Firstly, we generated SD-4 code with 15 codeword length that implies SD-4 code 3,900 lengths, secondly, we extended SD-4 code to 32,768 which is very long code length. Our model is based on SD-4 code as an encoding/decoding block cascaded by multiple pulse-position modulations (Q-PPM) in FSO communication environment. Such model performance is evaluated by lognormal atmospheric turbulent fading channels. Furthermore, coding gains are compared with different code lengths and Q-PPM modulations to demonstrate such codes ability of coding with pulse position modulation (Q-PPM). The optimal obtained raw code gain is equal to 0.56 dB for SD-4 at code length (4096) which analyzed with BPPM regarding the other related codewords (channel throughput is not considered). Meanwhile; the real code gain results have been obtained and equal to 3.87 dB at code length (32768) for such channel(channel throughput is considered). Tto demonstrate the SD-4 code ability to be coded with Q-PPM, we analyzed such code utilizing 4PPM and 8PPM. Also, we compared our results with existing results for other techniques namely : Hamming, Reed-Solomon, and Bose-Chaudhuri-Hocquenghem.
Açıklama
mazher, wamidh jalil/0000-0003-2092-3745
Anahtar Kelimeler
LDPC, Hamming Distance, Systematic Coding, FSO, PPM. Channel Throughput
Kaynak
International Journal of Computer Science and Network Security
WoS Q Değeri
N/A
Scopus Q Değeri
Cilt
17
Sayı
12
