Doğrudan dizili kod bölmeli çoklu erişim iletişim sistemlerinin Weibull sönümlü kanallardaki resim iletim başarımları

Yer ve zamandan bağımsız iletişim kurma talebi günümüzün vazgeçilmez ihtiyaçlardan birisi haline gelmiştir. Kullanılan mevcut iletişim sistemleri değerlendirildiğinde, sağladığı avantajlar nedeniyle çok büyük ölçüde kablosuz sistemlerin tercih edildiği görülmektedir. Doğrudan dizili kod bölmeli çoklu erişim (DD-KBÇE) iletişim sistemlerinin Weibull sönümlü kanallar üzerinden resim iletim başarımları literatürde ilk kez bu çalışmada araştırılmıştır. Weibull sönümlü kanal modeli bina içi ve bina dışı ortamlarda çok yollu yayılıma sahip sönümlemeli kanalların tanımlanabilmesi için önerilmiş uygun bir kanal modelidir. İletişim sisteminin analizinin sağlanabilmesi için Walsh-Hadamard yayma kodlarını kullanan bir DD-KBÇE sistemi tasarımı gerçekleştirilmiştir. Başarım analizleri hem farklı kullanıcı sayıları için hem de farklı kanal parametreleri için gerçekleştirilerek kapsamlı analizler sunulmuştur.

Image transmission performance of direct sequence code division multiple access communication systems in Weibull fading channels

Requirement of place and time independent communication has become one of the indispensable necessities of today. When the utilized communication systems are considered, it is shown that wireless communication systems are greatly preferred owing to presented advantages. Image transmission performances of the direct-sequence code division multiple access (DS-CDMA) systems over Weibull fading channels are examined for the first time in this study. The Weibull fading channel model is an appropriate channel model to characterize multipath fading channels for both indoor and outdoor environments. In order to analyze the communication system, design of a DS-CDMA communication system that utilizes the Walsh-Hadamard spreading codes are conducted. Detailed performance analyses are presented for both different user numbers and various channel parameters.

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