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

Yer vezamandan bağımsız iletişim kurma talebi günümüzün vazgeçilmez ihtiyaçlardanbirisi haline gelmiştir. Kullanılan mevcut iletişim sistemlerideğerlendirildiğinde, sağladığı avantajlar nedeniyle çok büyük ölçüde kablosuzsistemlerin tercih edildiği görülmektedir. Doğrudan dizili kod bölmeli çokluerişim (DD-KBÇE) iletişim sistemlerinin Weibull sönümlü kanallar üzerindenresim iletim başarımları literatürde ilk kez bu çalışmada araştırılmıştır.Weibull sönümlü kanal modeli bina içi ve bina dışı ortamlarda çok yolluyayılıma sahip sönümlemeli kanalların tanımlanabilmesi için önerilmiş uygun birkanal modelidir. İletişim sisteminin analizinin sağlanabilmesi içinWalsh-Hadamard yayma kodlarını kullanan bir DD-KBÇE sistemi tasarımıgerçekleştirilmiştir. Başarım analizleri hem farklı kullanıcı sayıları için hemde farklı kanal parametreleri için gerçekleştirilerek kapsamlı analizlersunulmuştur.

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

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

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