An interweave cognitive radio system based on the hierarchical 2D-spread MC-DS-CDMA with transmission power control

Chih Wen Chang, Chien Cheng Kuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper, we explore the potential of developing an interweave cognitive radio (CR) system based on a hierarchical wide-band two-dimensional spread multi-carrier directedsequenced code division multiple access (MC-DS-CDMA). First, a small CR cell is embedded in a large primary cell such that the spatial separation gives a chance to share the spreading code resources with the primary system. Second, the white, gray and black spreading codes are defined to facilitate the management of the spreading code resources. Also, a new multiple access interference (MAI) coefficient is derived to quantize the amount of intra- and inter-system interference. Third, based on the MAI coefficient, a dynamic spectrum access (DSA) algorithm, including the code assignment/reassignment, transmission power control and call admission control mechanisms, is proposed to efficiently utilize the white and gray spreading codes without damaging the primary system. The simulation results show that compared with the the case of using only the white spreading codes, some extra 53% increase in call admissions and 13% decrease in call droppings can be attained by using the gray spreading codes properly.

Original languageEnglish
Title of host publication2010 IEEE 71st Vehicular Technology
DOIs
Publication statusPublished - 2010 Jul 30
Event2010 IEEE 71st Vehicular Technology Conference, VTC 2010-Spring - Taipei, Taiwan
Duration: 2010 May 162010 May 19

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Other

Other2010 IEEE 71st Vehicular Technology Conference, VTC 2010-Spring
CountryTaiwan
CityTaipei
Period10-05-1610-05-19

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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