Bu makalede, turbo çarpım kodlarının(TPC) serbest uzay optik(FSO) sistemlerinin performansa olan etkisi incelenmiştir. Atmosfer modeli olarak log-normal dağılım seçilmiştir. MATLAB benzetim çalışmaları zayıf ve orta türbülansta gerçeklenmiştir. Turbo çarpım kodlarını oluşturan kod bileşenleri, genişletilmiş hamming ve genişletilmiş Bose–Chaudhuri–Hocquenghem(BCH) kodları olark kullanılmıştır. Benzetim sonuçlarına göre, özellikle orta türbülans altında TPC kullanımı ile hedeflenen bit hata oranına(bit error rate(BER))ulaşırken 15dB’ye kadar kod kazancı sağlanabilmektedir. Bu kod kazancı BCH tabanlı TPC kullanılırsa daha fazla iken hamming tabanlı TPC kullanılırsa daha az olmaktadır. Düşük kod oranlı ve BCH kod bileşeni ile oluşturulan TPC ile 0dB sinyal-gürültü oranı(signal to noise ratio(SNR)) değerinde bile sistemin BER’i 10^-5 ’e düşebilmektedir.
This article examines the impact of turbo fraction codes (TPCs) on the performance of free space optical systems (FSOs). The log-normal distribution is selected as the atmosphere model. MATLAB comparison studies have been carried out in weak and medium turbulence. The coding components that make up turbo fraction codes, expanded hamming and expanded Bose-Chaudhuri-Hocquenghem(BCH) codes were used. According to the comparison results, the code gain can be achieved up to 15dB while passing the target bit error rate (BER) by using TPC, especially under medium turbulence. This code gain is less if BCH-based TPC is used more while hamming-based TPC is used. With the low-cod ratio and BCH code component created TPC, even the signal to noise ratio (SNR) can lower the system's BER to 10^-5.
Inthisarticle, theeffect of turbo productcodes(TPC) overtheperformance of freespaceopticssystems is analyzed. Log-normal distribution is selected as theturbulence model. MATLAB simulationsarecarriedout in weak and moderate turbulence. Component codes which construct turbo product codes are used as extended hamming and extended Bose–Chaudhuri–Hocquenghem(BCH) codes. According to simulation results, it can be provided that up to15dB code gain to reach the target bit error rate(BER) with the use of TPC especially under moderate turbulence. While this code gain is more if BCH based TPC is used, it becomes less if hamming based TPC is used. With low code rate and TPC which is constructed with BCH codecomponent, BER of system can decreaseto even in 0dB signal to noise ratio(SNR).
Alan : Mühendislik
Dergi Türü : Ulusal
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