Effects of subcarrier power allocation on an interference avoidance code assignment strategy for multirate MC-DS-CDMA systems

Chih Wen Chang, Li Chun Wang

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In this paper, we propose a joint subcarrier power allocation (SPA) and code assignment scheme for the synchronous multirate multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA) system with time- and frequency-domain spreadings. Based on the newly defined metric multiple-access interference (MAI) coefficient, the proposed code assignment strategy can quantitatively predict the incurred MAI before assigning a spreading code. The SPA mechanism aims to maximize the received signal power. In addition to lowering the MAI, the proposed code assignment strategy further considers the compactness of the assigned codes in the entire 2-D tree structure. The simulation results show that the proposed joint SPA and code assignment strategy not only can reach a better received signal quality but can also achieve a high call admission rate.

Original languageEnglish
Pages (from-to)1513-1526
Number of pages14
JournalIEEE Transactions on Vehicular Technology
Volume57
Issue number3
DOIs
Publication statusPublished - 2008 May

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

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