TY - JOUR
T1 - Effects of subcarrier power allocation on an interference avoidance code assignment strategy for multirate MC-DS-CDMA systems
AU - Chang, Chih Wen
AU - Wang, Li Chun
N1 - Funding Information:
Manuscript received June 7, 2007; revised March 16, 2007 and July 25, 2007. This work was supported by the National Science Council, Taiwan, under Contract 94-2213-E-009-060, Contract 95-2218-E-006-041, and Contract 96-2221-E-006-020. The review of this paper was coordinated by Dr. K. Molnar.
PY - 2008/5
Y1 - 2008/5
N2 - 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.
AB - 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.
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U2 - 10.1109/TVT.2007.909300
DO - 10.1109/TVT.2007.909300
M3 - Article
AN - SCOPUS:44849136514
SN - 0018-9545
VL - 57
SP - 1513
EP - 1526
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 3
ER -