Abstract
Spectrum is a natural resource of communication path and it is main entity of wireless communication. At present maintain the spectrum secrecy is a big problem because of exponential growth of users and devices of wireless communication. Spectrum have two types of user first one is primary i.e. licenced and other one is secondary i.e. unlicensed user. Secondary user doesn’t need any license to operate but primary user needs to license to operate in a fix geographical area with a fixes time duration. The entire time spectrum is underutilized. Spectrum has limited frequencies so we can’t increase spectrum frequencies but we try to improve spectrum efficiency by the help of different technologies and methodologies. Cognitive radio, Software defined Radio and Spectrum sharing technique play an important role to improve spectrum efficiency but interference, false alarm and low detection is a problem that can reduce by MIMO technology. In this paper we discuss about cognitive radio network and Software Defined Radio technology to improve the performance of wireless communication and MIMO technology to reduce interference and false alarm and improve probability of detection to build future generation of wireless communication.
Highlights
Wireless communication system works on frequencies provided by spectrum
As we see in current scenario number of user of wireless communication system increases dramatically because it is easy to access any time anywhere and beneficial in many aspects than wired communication
Faces difficulty by advancement of old technology, normally spectrum is underutilized is main drawbacks of static spectrum allocation technique so to overcome these drawbacks dynamic spectrum access tech is introduced by radio engineers dynamic spectrum access is most efficient way of spectrum sharing [3]
Summary
Wireless communication system works on frequencies provided by spectrum. Spectrum has limited frequencies because it is a natural resource. Cognitive radio network is a technology that sense unused frequencies by licensed user and provide unused frequency to unlicensed user. Cognitive radio uses dynamic spectrum access technique to find white space [5,6,7] i.e. unused frequencies (Table 1).
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