Spectrum Sensing and Throughput Analysis for Cognitive Radio An Overview

Spectrum Sensing and Throughput Analysis for Cognitive Radio An Overview

M. A. Matin (Institut Teknologi Brunei, Brunei Darussalam), M Ahmed (North South University, Bangladesh) and N. Ferdous (North South University, Bangladesh)
DOI: 10.4018/978-1-4666-1797-1.ch010
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Cognitive radio (CR) is a new technology introduced to deal with the issues of spectrum scarcity and underutilization. Since the spectrum is limited, the unlicensed secondary users (CR users) opportunistically access the underutilized spectrum allocated to the licensed primary users (PUs) of the network. This chapter first gives a brief overview on spectrum sensing and its impact on the system throughput in a cognitive radio network. Later, cooperative relays are introduced in the network to improve spectrum efficiency and mitigate interference to PU. A detailed analysis of power allocation is demonstrated where the transmit power of CR is kept within such limit so that it can maintain low interference to PU. This optimal power allocation can achieve high throughput, which is also presented in this chapter.
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One of the main reasons for the birth of Cognitive Radio in the wireless world is to fight against the problems of spectrum scarcity (Haykin, 2005) and spectrum underutilization (Neel, 2006). On one hand the radio spectrum is scarce and on the other hand the licensed users do not use their spectrum fully which results in underutilization of the band (FCC, 2003a). To mitigate the problem of underutilization, unlicensed users better known as secondary users (SU) are introduced in the wireless network to utilize the unused band by the PU. The secondary users are also referred to as Cognitive Radios (CR) which was first introduced by Mitola and Maguire (1999).

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