Bilişsel Radyo Uygulamaları için Uzun Süreli Spektrum Doluluk Ölçümleri: Samsun Şehir Merkezi Örneği

Abstract

Bu çalışmada Samsun şehir merkezinde 470 MHz - 790 MHz frekans aralığında, spektrumun en yoğun olduğu bölgede, 7 farklı günde ve 14 farklı zamanda spektrum doluluk ölçümleri yapılmıştır. Ölçümlerde RTL2832U-R820T spektrum analizörü kullanılmıştır. Spektrum doluluk değerlendirmelerinde referans olarak -40 dB ve -45 dB sinyal gücü seçilmiştir. Ölçüm sonuçlarından spektrum doluluk oranlarının zamana bağlı olarak değişkenlik gösterdiği bazı kanalların gün içerisinde kullanılmadığı veya sinyal kalitesinin kullanılmayacak kadar düştüğü görülmüştür. -40 dB referans sinyal seviyesi için 320 MHz’lik spektrumun en fazla % 60’ı kullanılırken, -45 dB için bu oran %55’dir. Dolayısıyla seçilen ölçüm noktası için gün içinde 144 MHz’e yakın bir spektrum kullanılmamaktadır. Bu değer analog TV frekans bandında (470 MHz - 790 MHz) bilişsel radyo uygulamalarından olan IEEE 802.11af ve IEEE 802.22 kablosuz sistemlerinin rahatlıkla kullanılabilir olduğunu göstermektedir.

Keywords

• Spektrum doluluk ölçümleri
• TV beyaz boşluk
• Bilişsel radyo

Long Term Spectrum Occupancy Measurements for Cognitive Radio Applications: Samsun City Center Example

Abstract

In this study, spectrum occupancy measurements were performed in seven different days and 14 different times between 470 MHz and 790 MHz frequency band in the most dense spectrum part of Samsun city center. RTL2832U-R820T spectrum analyzer was used for measurements. In the spectrum occupancy evaluations, -40 dB and -45 dB signal strength levels was selected as reference. It was seen from the measurement results that some channels where spectrum occupancy rates vary according to time are not used during the day or signal quality is reduced to not use. Up to 60 % of the 320 MHz spectrum is used for the -40 dB reference signal level, while for -45 dB this rate is 55 %. Therefore, a spectrum close to 144 MHz per day is not used for the selected measurement location. This value shows that the cognitive radio applications such as IEEE 802.11af and IEEE 802.22 wireless systems in analog TV frequency band (470 MHz-790 MHz) can be used easily.

Keywords

• Spectrum occupancy measurement
• TV white space
• Cognitive radio

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