Implementation of a peak windowing algorithm for crest factor reduction in WCDMA
Hiten N. Mistry · Summit (Simon Fraser University) · 2006
Wideband Code Division Multiple Access (WCDMA) composite downlink signals from the base station have high Peak-to-Average Ratio (PAR) as the number of users increase.The PAR is also known as Crest Factor (CF), the ratio of the peak power to the mean power of the signal, or how high the signal peaks are.A base station power amplifier is performance limited by high CF.This project involves implementing and improving a published Crest Factor Reduction (CFR) technique to limit PAR and avoid amplifier saturation.Matlab simulations are performed before implementing the algorithm in an Altera Field-Programmable Gate Array (FPGA).Each algorithm is simulated and then compared using signal quality parameters Error Vector Magnitude (EVM) and Adjacent Channel Leakage power Ratio (ACLR).The improvement to the algorithm is shown to decrease EVM and CF while maintaining similar ACLR values as the windowing length is varied.