PAPR and out-of-band power reduction in OFDM-based cognitive radios

One of the interesting features of cognitive radio (CR) systems is their ability to provide dynamic spectrum access even in the licensed spectral bands; wherein they should be strictly causing no interference to the licensed users or among themselves. Orthogonal frequency-division multiplexing (OFDM...

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Bibliographic Details
Published in2015 International Conference on Signal Processing and Communication Engineering Systems pp. 473 - 476
Main Authors Lasya, P. Raghava, Kumar, M. Sathish
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.01.2015
Subjects
Cognitive radio
Educational institutions
Filtering
iterative clipping and filtering
OFDM modulation
orthogonal frequency-division multiplexing
out-of-band radiation
Peak to average power ratio
selected mapping
spectral precoding
Vectors
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Summary:One of the interesting features of cognitive radio (CR) systems is their ability to provide dynamic spectrum access even in the licensed spectral bands; wherein they should be strictly causing no interference to the licensed users or among themselves. Orthogonal frequency-division multiplexing (OFDM) is considered for CR user transmission because of its flexible operation in frequency band switching; but suffers from high peak-to-average power ratio (PAPR). Hence, a transmission method where it can cause minimum interference with lower PAPR is obtained. In this paper, a better method to reduce out-of-band (OOB) power as well as PAPR is modeled by combining spectral precoding which aims at OOB radiation suppression; and PAPR reduction techniques such as selected mapping (SLM) technique and iterative clipping and filtering (ICF). The performance of these methods are discussed in terms of power spectral densities (PSD) and complementary cumulative distribution function (CCDF) of PAPR.
DOI:10.1109/SPACES.2015.7058309