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

Chih-Wen Chang, Chien Cheng Kuo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Maintaining the quality-of-service (QoS) requirement by transmission power adjustment while eliminating interference is an important but difficult task in the downlink multicarrier direct-sequence code division multiple access (MC-DSCDMA) systems with two-dimensional (2D) spreading. To achieve this goal, we integrate the power control (PC) mechanism and the interference avoidance code assignment strategy. This joint policy is to firstly eliminate interference via an interference avoidance (IA) code assignment strategy and then maintain the QoS via a power control mechanism. To facilitate the code assignment strategy, a new PC-based multiple access interference (MAI) coefficient is defined through performance analysis. Thanks to the help of the PC-based MAI coefficient, we can evaluate each candidate code by quantitatively predicting the amount of interference produced by a possible code assignment event. With this interference pre-evaluation, the PC mechanism can not only maintain the QoS with less transmission power but also eliminate extra MAI in the system. The simulation results show that the proposed joint scheme can maintain a predefined signal quality and significantly improve the call admission rate while largely reducing the power consumption. The contribution of this paper fills up the missing link between the power control and code assignment in the 2D-spread MC-DS-CDMA systems.

Original languageEnglish
Article number5336785
Pages (from-to)5582-5591
Number of pages10
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number11
DOIs
Publication statusPublished - 2009 Nov 1

Fingerprint

DS-CDMA
Power Control
Power control
Code division multiple access
Assignment
Interference
Multiple Access Interference
Multiple access interference
Quality of Service
Quality of service
Power transmission
Eliminate
Multicarrier
Code Division multiple Access
Coefficient
Power Consumption
Performance Analysis
Strategy
Adjustment
Electric power utilization

All Science Journal Classification (ASJC) codes

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

Cite this

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A joint power control and interference avoidance code assignment strategy for downlink MC-DS-CDMA with 2D spreading. / Chang, Chih-Wen; Kuo, Chien Cheng.

In: IEEE Transactions on Wireless Communications, Vol. 8, No. 11, 5336785, 01.11.2009, p. 5582-5591.

Research output: Contribution to journalArticle

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