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Improved Throughput of WCDMA Downlink using Power Ramping under Retransmissions for Type I Hybrid ARQ with in Rayleigh Fading Channel  

Kim, Bong-Hoe (LG전자 이동통신기술연구소)
Hwang, Seung-Hoon (동국대학교 전자공학과)
Hong, Yu-Pyo (동국대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.1A, 2007 , pp. 9-12 More about this Journal
Abstract
In this paper, we propose and analyze a scheme for wireless channels, which is a combination of a type I hybrid-automatic repeat request (H-ARQ) scheme and a power ramping. The power ramping is considered for more reliable downlink data transmission, in which the transmission power is gradually changed from a small level to a large level when the number of retransmissions increases. The simulation results demonstrate that, when the power ramping step size is 0.5dB, the average throughput gain may be as high as 2% to 5% with properly selected parameters.
Keywords
Type I hybrid ARQ; power ramping; WCDMA downlink; Rayleigh fading channel;
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