Robust SIR Measurement Algorithm with Closed Loop Power Control in High Speed Mobile Channel Environment

Jung-Su HAN  Joo-Hyun DO  Kyung-Sup KWAK  Hyung-Jin CHOI  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.10   pp.2819-2827
Publication Date: 2006/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.10.2819
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
WCDMA,  SIR measurement,  closed-loop power control,  CPICH,  

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In this paper, we propose an enhanced signal to interference ratio (SIR) measurement algorithm and evaluate the performance of the proposed algorithm in a WCDMA forward link receiver with closed-loop fast transmit power control. The proposed algorithm reduces measured SIR offset by using a pilot channel (CPICH) to compensate for the attenuated signal power in fading channel environment. The proposed SIR measurement algorithm outperforms conventional SIR measurement algorithm with regard to mean SIR values and jitter, especially in high speed mobile channel environment. Also, performance results with closed loop power control show that the proposed algorithm has better performance than the conventional algorithm.