25-08-2013, 06:19 PM
Abstract—In this paper, spectrum sensing of an orthogonal frequency
division multiplexing (OFDM) based cognitive radio (CR)
is addressed. The goal is to identify the portions of the spectrum
that are unused by primary user systems and other CR systems,
called existing user (EU) systems altogether, with the emphasis on
conquering the challenge imposed by multipath fading channel.
The sensing of EU systems consists of two steps. In the first step,
the maximum likelihood (ML) estimates of the frequency bands
of EU systems are calculated; in the second step, detection is performed
at each suspected band to decide whether an EU system is
truly in operation. The idea is that an EU system appears at a segment
of continuous subcarriers. This fact can be exploited by employing
measurements at a continual subcarriers and executing the
sensing along the frequency domain. An autoregressive (AR) model
is adopted to track the variation of the received EU signal strength
along frequencies. It is shown by simulations that the proposed
spectrum sensing algorithm is robust in a severe frequency-selective
fading channel.
hello my self Parekh Pratik Rajendrakumar. I have passed out BE from Hasmukh Goswami college of engineering with 70.30% in EC.
right now i m doing masters(M.E) in communication from G.H.patel college of engineering and technology.my project title is spectrum sensing in cognitive radio by using ofdm.i want MATLAB code for this topic.