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Energy detection in cognitive radio
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Energy detection is an attractive spectrum sensing method for cognitive radio. The design of energy detection relies on two critical assumptions: 1) noise power is perfectly and {it a prior} known; and 2) the test statistics in energy detection can be accurately modeled as independent and identically distributed (i.i.d.) Gaussian random variables. In practice, noise power varies from time to time. This renders difficulty in estimating noise power and incurs an inaccuracy in modeling the test statistics. This paper studies how to realize energy detection using software-defined radio in a real environment. The noise power variation in a real environment is investigated. A histogram based method is proposed to determine the threshold of energy detection.
naaveeen01 2 0
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Cognitive radio spectrum sensing
4.0
Spectrum sensing needs cognitive radio in order to find the flexible use of opportunistic spectrum. In addition, it is the interference management that causes the level of key to the primary user (PUs) spectrum. Remote sensing provides
naaveeen01 3 0
1
MATLAb code for basic OFDM model
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In digital communications, information is expressed in the form of bits. The
term symbol refers to a collection, in various sizes, of bits [6]. OFDM data are
generated by taking symbols in the spectral space using M-PSK, QAM, etc, and
convert the spectra to time domain by taking the Inverse Discrete Fourier Transform
(IDFT). Since Inverse Fast Fourier Transform (IFFT) is more cost effective to
implement, it is usually used instead [3]. Once the OFDM data are modulated to time
signal, all carriers transmit in parallel to fully occupy the available frequency
bandwidth [7]. During modulation, OFDM symbols are typically divide
naaveeen01 1 0
1
MATLAB simulation of basic cognitive radio
4.0
We investigate the idea of reusing local unused spectrum to increase the total capacity of the simulated cognitive radio system. In the research phase of the project, we tried to dig out all the available simulation methods, but unfortunately no one mentioned the exact method or program and most of the simulation is on some specific hardware platform. So we can find all kinds of parameters of cognitive radio system on various hardware platforms. Previous simulation methods can be used to simulate only some specific aspects of cognitive radio technology, such as system handover test bed, spectral efficiency, spectral scanning, MIMO technology and CR system. We simulate the basic knowledge of a simple cognitive radio system in MATLAB r2008b. Is there any previous technology available, or can't we find a person to simulate cognitive radio systems. But we have tried our best to make our code as simple as possible as the survey results, so that they are easy to understand for anyone, even a little bit know what the basic communication system is.
naaveeen01 2 0
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