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With some recent developments in the field of wireless communication at rapid pace, users are getting a number of applications which require the precious bandwidth to work on. As the bandwidth is limited, the available spectrum is being congested day by day. Cognitive Radio System (CRS) plays an important role in such scenario. It dynamically adapts its parameters and protocols to provide unused spaces...
Cognitive Radio (CR) seems to be a tempting solution in order to resolve the problem regarding spectrum underutilization and spectrum scarcity. Among the various fundamental functions of CR system, spectrum sensing is the key function where it senses the electromagnetic environment to detect spectrum holes (vacant frequency bands), that can be utilized by Secondary Users (SU) to achieve spectral efficiency...
Phase noise causes degradation in the performance of orthogonal frequency division multiplexing (OFDM) based wireless communication systems. The phase noise presence can reduce effective signal to noise ratio (SNR) at the receiver, reduces the bit error rate (BER) and data rate. Phase noise introduces two effects: common phase error (CPE) and inter-carrier interference (ICI) and therefore degrade...
Numerous algorithms have been invented for optimizations which are nature inspired and based on real life behaviour of species. In this paper, intelligent chasing and hunting methods adopted by the dogs to chase and hunt their prey in groups are used to develop the novel methodology named as “Dog Group Wild Chase and Hunt Drive (DGWCHD) Algorithm”. The proposed algorithm has been implemented on some...
Numerous methodologies, system models and modulation techniques are present in literatures for indoor Visible Light Communication (VLC). This paper proposed a VLC system model, for Line of Sight (LOS) and partially Non Line of Sight (NLOS) in indoor applications. The novice modulation technique based on polarization phase shift key and Brewster's angle based polarization diversity technique (BABPDT)...
The Frequency Assignment Problem is assignment of frequencies or channels to establish link between base station and mobile transmitter in cellular system. To avoid interference, minimum separation between assigned frequencies is required. This problem is NP-hard. Due to limited availability of spectrum and reuse of same frequencies at different geographical locations, an excellent assignment is to...
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