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The cognitive radio technology is the new paradigm to fulfill ever increasing need of bandwidth ultimately the radio spectrum by accommodating the radio spectrum dynamically to secondary users/unlicensed users without causing the interference. In cognitive radio, the spectrum opportunities have been checked for Space, Time and frequency dimensions but ‘Angle’ dimension has not been explored till now...
Since the spectrum is a scarce natural resource, sensing a spectrum is an important part of Green Engineering. The cognitive radio has been proposed to meet the ever increasing demand of the radio spectrum by allocating the spectrum dynamically to allow unlicensed access on non-interfering basis. But, the conventional spectrum sensing methods are seeking for spectrum opportunities in either of three...
The complexity of wireless system requires a careful design, especially related to bandwidth and energy efficiency. The energy efficiency is getting more and more on importance, due to increasing penetration of various wireless systems in different battery-oriented applications, as well as due to the more conscious global view on the need for “greening the Earth”. Bandwidth efficiency is very important...
Bandwidth efficiency is very important parameter, because it relates to frequency spectrum, which is naturally, limited resource. The cognitive radio has been proposed as the future technology to meet the ever increasing demand of the radio spectrum by allocating the spectrum dynamically to allow unlicensed access on non-interfering basis. Conventional sensing methods usually relate to sensing the...
In cognitive radio networks, the first cognitive task preceding any form of dynamic spectrum management is the spectrum sensing and identification of spectrum holes in wireless environment. In cognitive radio, spectrum sensing is fundamental crucial task. Energy detection method is a basic method, which requires knowledge of noise power but suffers from noise uncertainty problem. Covariance based...
Since the spectrum is the scarce resource, spectrum sensing is an important part of Green Engineering. The cognitive radio has been proposed as the future technology to meet the ever increasing demand of the radio spectrum by allocating the spectrum dynamically to allow unlicensed access on non-interfering basis. In cognitive radio, spectrum sensing is the fundamental problem. Energy detection method...
700MHz band attracted many researchers and stakeholders for mobile communications by providing a rare opportunity to have cost effective wireless solutions due to its excellent propagation characteristics compared to GSM 1800 MHz, 2.1 GHz or 2.5 GHz bands for 3G/BWA. In India, 698–806 MHz more specific 700MHz band mainly used by TV broadcast services. We discuss the scope and nature of opportunities...
There is a global coordinated move for Digital Switchover (DSO) by discontinuing analogue TV transmission. In India the frequency band 470–806 MHz has been allotted to Fixed, mobile broadcasting services on primary basis and 698–806 MHz more specific 700MHz band mainly used by TV broadcast services. This Digital Dividend offers real opportunities for wireless innovation. We discuss the scope and nature...
The basic idea of cognitive radio is to reuse the spectrum whenever it finds the spectrum holes in wireless environment. In cognitive radio spectrum sensing is the fundamental problem. Energy detection method is the simplest method but suffers from noise uncertainty problem. Covariance absolute value exploits space-time signal correlation. In this paper we describe the hybrid detection method which...
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