Dynamic Digital Channelizer Based on Spectrum Sensing

Junpeng Hu, Zhen Zuo, Zhiping Huang and Zhi Dong

PLOS ONE, 2015, vol. 10, issue 8, 1-11

Abstract: The ability to efficiently channelize a received signal with dynamic sub-channel bandwidths is a key requirement of software defined radio (SDR) systems. The digital channelizer, which is used to split the received signal into a number of sub-channels, plays an important role in SDR systems. In this paper, a design of dynamic digital channelizer is presented. The proposed method is novel in that it employs a cosine modulated filter bank (CMFB) to divide the received signal into multiple frequency sub-bands and a spectrum sensing technique, which is mostly used in cognitive radio, is introduced to detect the presence of signal of each sub-band. The method of spectrum sensing is carried out based on the eigenvalues of covariance matrix of received signal. The ratio of maximum-minimum eigenvalue of each sub-band is vulnerable to noise fluctuation. This paper suggests an optimized method to calculate the ratio of maximum-minimum eigenvalue. The simulation results imply that the design of digital channelizer can effectively separate the received signal with dynamically changeable sub-channel signals.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0136349

DOI: 10.1371/journal.pone.0136349

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