Title :
Peak-to-average ratio (PAR) reduction by Walsh code selection for IS-95 and CDMA2000 systems
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
fDate :
12/1/2000 12:00:00 AM
Abstract :
Peak-to-average ratio (PAR) of a signal is an important parameter for a linear amplifier because it determines the backoff factor needed to be applied to the amplifier in order to avoid clipping and hence spectral regrowth. The author analyses and compares the PAR of the downlink signal for the IS-95 and the CDMA2000 single carrier systems. It is found that PAR of the signal depends on the Walsh code assignment. PAR control by Walsh code selection is proposed and its effectiveness is discussed
Keywords :
cellular radio; code division multiple access; codes; multiuser channels; radio links; CDMA2000 single carrier system; CDMA2000 systems; DS-CDMA; IS-95; Walsh-code selection; backoff factor; cellular radio; downlink signal; forward link; linear amplifier; peak-to-average ratio reduction; spectral regrowth;
Journal_Title :
Communications, IEE Proceedings-
DOI :
10.1049/ip-com:20000685
