Spectrum monitoring for cognitive radios in Rayleigh fading channel

Soltanmohammadi, Erfan; Orooji, Mahdi; Naraghi-Pour, Mort

doi:10.1109/milcom.2012.6415725

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Introduction and System Model1

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2013

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“…Others have proposed methods to mitigate the effects of CCI [12][13][14][15] or to exploit its effects on the SU receiver statistics in order to detect the emergence of the primary user [16,17].…”

Section: Introduction and System Modelmentioning

confidence: 99%

Evaluating the effects of co-channel interference inwireless networks

Orooji

Soltanmohammadi

Naraghi-Pour

2013

2013 IEEE International Conference on Acoustics, Speech and Signal Processing

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The growing demand for wireless services has led to the introduction of new paradigms in spectrum sharing such as the unlicensed ISM and U-NII bands and dynamic or opportunistic spectrum access through cognitive radios. Coexistence of users in these technologies leads to increases in co-channel interference (CCI) which needs to be appropriately mitigated. CCI is often modeled as a white Gaussian noise process and assumed to simply reduce the signal-to-noise (plus interference) ratio. In this paper we consider the effect of CCI by a careful examination of the samples at the output of the matched filter receiver. We show that the timing offset between the interference and the desired signals may result in the correlation of errors in adjacent symbols. We evaluate the bit error rate (BER) resulting from CCI as well as the distribution of the total number of errors in a packet.Index Terms-Interchannel interference, Bit error rate, Wireless communication.

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