Kaskat bir sistemin FTR sönümlemeli kanallarda HQAM performans analizi

Bu çalışmada kaskat yapıya sahip bir sistemin dalgalanmalı iki ışınlı (fluctuating two-ray, FTR) sönümlenmeli kanallarda altıgen karesel genlik modülasyonu (hexagonal quadrature amplitude modulation, HQAM) analizi gerçekleştirilmiştir. Yapılan analizlerde ele alınan sistemin olasılık yoğunluk fonksiyonu (probability density function, PDF) kullanılmıştır. Sunulan hata analizlerinde hem yaklaşık hata ifadesi hem de matematiksel olarak daha sade bir analiz için asimptotik hata ifadesi türetilmiştir. Ele alınan sistemin performans değerlendirmeleri farklı kaskat bağlantı sayısı, sönümlenme parametre değerleri, yansıtıcı parametre değerleri ve modülasyon seviyeleri için gerçekleştirilmiştir. Yapılan analizler sonucunda elde edilen analitik ve asimptotik ifadelerin doğruluğu tam nümerik sonuçlarla gösterilmiştir.

Anahtar Kelimeler:

Kaskat FTR sönümlenmesi, hata olasılığı analizi, HQAM tekniği

Performance analysis of HQAM for a cascaded system over FTR fading channels

In this study, performance analysis of a cascaded system with hexagonal quadrature amplitude modulation (HQAM) is performed over fluctuating two-ray (FTR) fading channels. The probability density function of the considered system is employed in the analysis. In the presented error analysis, both the approximate error expression and the asymptotic error expression for a simpler mathematical analysis are derived. Performance evaluations of the considered system are carried out for different number of cascade connections, fading parameter values, reflective parameter values and modulation levels. Finally, the accuracy of the analytical and asymptotic expressions obtained as a result of the analyses is shown with exact numerical results.

Keywords:

Cascaded FTR fading, Error probability analysis, HQAM technique,

PDF

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