A joint power control and interference avoidance code assignment strategy for downlink MC-DS-CDMA with 2D spreading

Chih Wen Chang, Chian Cheng Kuo

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

1 Citation (Scopus)

Abstract

Maintaining the quality-of-service (QoS) requirement while eliminating interference is an important but difficult task in the downlink MC-DS-CDMA with two-dimensional (2D) spreading. To achieve this goal, we integrate the power control (FC) mechanism and the interference avoidance code assignment strategy. This joint policy is to firstly eliminate interference via the interference avoidance (IA) code assignment strategy and then maintain the QoS via power control. To facilitate the code assignment strategy, by performance analysis, we define a new PC-based multiple access interference (MAI) coefficient. Thanks to the help of the MAI coefficient, we can evaluate each candidate code by quantitatively predicting the possible interference it may produce. With this interference pre-evaluation, the extra MAI m the system can be avoided. Subsequently, the power control mechanism can maintain the QoS using less power to further eliminate MAI. The simulation results show that the proposed joint scheme can maintain a predefined signal quality and achieve a high code admission rate while reducing the power consumption to 68% in the considered case.

Original languageEnglish
Title of host publication2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2316-2320
Number of pages5
ISBN (Print)9781424416455
DOIs
Publication statusPublished - 2008 Jan 1
Event2008 IEEE 67th Vehicular Technology Conference-Spring, VTC - Marina Bay, Singapore
Duration: 2008 May 112008 May 14

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Other

Other2008 IEEE 67th Vehicular Technology Conference-Spring, VTC
CountrySingapore
CityMarina Bay
Period08-05-1108-05-14

All Science Journal Classification (ASJC) codes

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

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