An Efficient Relay Selection and Clustering Technique for Spectrum Sharing Network

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Abstract
When we consider a spectrum sharing networks
it have primary user and secondary user. Spectrum share by the
first user is called primary user. Primary user used the allocated
spectrum without affected any interference. But in the case of
secondary user used the primary user spectrum it has much
interference occur, also need more emitted power. xG networks
are envisioned to provide opportunistic access to the licensed
spectrum using unlicensed users. This setting enables multiple
systems being deployed in overlapping locations and
spectrum.so primary user and secondary user speed also
decreases. In our project above problem should be overcome
by using proper relay selection and clustering technique. Here
used distributed relay selection and clustering to improve the
secondary rate and also reduced the secondary emitted power.
Keywords:spectrum sharing, relay, clustering
I.INTRODUCTION
Traditionally, use of radio spectrum has been highly
regulated in order to prevent interference among users of
adjacent frequencies or from neighboring geographic areas. In
the past decade there have been significant innovations in the
theory of spectrum management along with gradual changes in
practice of spectrum management and regulation. This gradual
change follows a growing consensus that past and current
regulatory practices originally intended to promote the public
interest have in fact delayed, [1] in some cases, the introduction
and growth of a variety of beneficial technologies and services,
or increased the cost of the same through an artificial
scarcity[5]. In addition to these delays, the demand for
spectrum has grown significantly Those reasons are making
policy-makers and regulators worldwide focus on new methods
of spectrum regulation with an increasing emphasis on striking
the best possible balance between the certainty required to
ensure stable roll-out of services and flexibility (or light-handed regulation) leading to improvements in cost, services and the
use of innovative technologies[3]. In developing countries in
particular, where mobile communications users now greatly
outnumber those using fixed line telecommunication services, it
is widely recognized that the spectrum is a highly valuable
resource for future economic development. Access to the radio
spectrum is based on the Table of Frequency Allocations of the
International Telecommunications Union (ITU) Radio
Regulations, where defined categories of radio service are
allocated frequency bands in different parts of the
spectrum[2][4]. The spectrum allocations can be on exclusive,
shared, primary or secondary basis. Due to scarcity of the
frequency spectrum, many bands are allocated for more than
one radio service and are, therefore, shared. Spectrum sharing
studies aim to identify technical or operational compatibilities
that will enable radio services to operate in the same (or
adjacent) frequency bands without causing unacceptable
interference to each other[2][3]. Often, sharing becomes
possible when limits are placed on certain system parameters
— for example, antenna radiation patterns, transmission power
etc. Decisions are made at the national levels on the purpose or
purposes to which particular frequencies will be used. These
decisions are reflected in the International and National Tables
of Frequency Allocations.
CONCLUSION
Tour project investigated how increase the secondary rate and
also decrease the interference level in primary user. Our project
result shows the maximum secondary rate with minimum relay.
Here there is no cross channel interference occur in primary
and secondary user. The trade-off between the secondary rate
and the interference on the primary was characterized. We have
also developed a low-complexity Spectrum sharing and
allocation suboptimal approach for relay selection.
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