Filter Bank Spectrum Sensing for Cognitive Radios

Abstract

The primary task in any cognitive radio (CR) network is to dynamically explore the radio spectrum and reliably determine portion(s) of the frequency band that may be used for the communication link(s). Accordingly, each CR node in the network has to be equipped with a spectrum analyzer. In this paper, we propose filter banks as a tool for spectrum sensing in CR systems. Various choices of filter banks are suggested and their performance are evaluated theoretically and through numerical examples. Moreover, the proposed spectrum analyzer is contrasted with the Thomson's multitaper (MT) method-a method that in the recent literature has been recognized as the best choice for spectrum sensing in CR systems. A novel derivation of the MT method that facilitates our comparisons as well as reveals an important aspect of the MT method that has been less emphasized in the recent literature is also presented.Index Terms-Radio spectrum management, spectral analysis.

Medium Access Control Signaling for Reliable Spectrum Agile Radios

“…1. During the sensing period, the broadband channel is divided into a number of subchannels and each SU senses these subchannels using a Filterbank [12], [13]. The signaling period is used to implement the collaborative sensing.…”

Spectrum Sensing for Cognitive Radio : State-of-the-Art and Recent Advances

“…If the spectral properties of the signal to be detected are known, but the signal has otherwise no usable features that can be efficiently exploited, then spectrum estimation techniques like filterbankbased detectors may be preferable [3], [36]- [38]. In addition, if the cognitive radio system exploits a filter bank multicarrier technique, the same filter bank can be used for both transmission and spectrum sensing [36].…”

“…In addition, if the cognitive radio system exploits a filter bank multicarrier technique, the same filter bank can be used for both transmission and spectrum sensing [36]. Hence, the sensing can be done without any additional cost.…”

“…For more details on spectrum sensing using filterbanks and multitaper methods, we refer the reader to [36] and [38].…”

Spectrum-Efficient Cognitive Radio Transceiver Using Multiwavelet Filters

“…This is not common in any conventional system and hence its successful implementation is a crucial task [27]. Considerable research has been done in this area and numerous algorithms and architectures are available in literature [26][27][28][29][30][31][32][33][34][35][36][37]. The existing research results prove that spectrum sensing can be implemented in two stages-preliminary or coarse sensing at the physical layer and fine sensing at the MAC layer [28].…”