A novel interference-avoidance code reassignment for downlink two-dimensional-spread MC-DS-CDMA systems with power control

Chih Wen Chang, Chien Cheng Kuo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In the 2-D time- and frequency-domain spread multicarrier direct-sequenced code-division multiple-access (MC-DS-CDMA) system, maintaining a good code tree structure is the key to controlling the interference level. However, as users come and go, the code tree structure will be fragmented and steeped in a high level of interference. In this situation, an active call may be dropped for not being able to reach a predefined signal quality. To solve this call-dropping problem, we propose a novel code-reassignment strategy to reallocate a low-interferenced code to the could-be-dropped call. This way, not only can this possible call-dropping event be evaded, but also, a low-interferenced 2-D code tree structure can be maintained. The simulation results show that the proposed code-reassignment method can efficiently alleviate the call-dropping problem and boost the call-survival rate simultaneously. It is believed that the proposed scheme fills up an important missing link of the dynamic call-resource management for the 2-D-spread MC-DS-CDMA system.

Original languageEnglish
Article number5443643
Pages (from-to)3104-3108
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Volume59
Issue number6
DOIs
Publication statusPublished - 2010 Jul

All Science Journal Classification (ASJC) codes

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

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