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1 2Performance Evaluation of Transmit Diversity Techniques in the CDMA2000 Standard (2004)
BibTeX
@MISC{Vajapeyam0412performance,
author = {Murali S. Vajapeyam and Levent Aydin and Lizhong Zheng and Arthur C. Smith and Murali S. Vajapeyam},
title = {1 2Performance Evaluation of Transmit Diversity Techniques in the CDMA2000 Standard},
year = {2004}
}
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Abstract
This thesis evaluates the performance of two forward-link transmit diversity techniques in the CDMA2000 standard: Space-Time Spreading (STS) and Phase-Sweep Transmit Diversity (PSTD). For each technique, the evaluation consists of conducting 9.6 kbps Markov calls in the field and measuring the mean forward-link fundamental-channel (F-FCH) transmit power required to achieve a 1 % frame error-rate (FER) at the mobile receiver. The required transmit power is used to compute an estimate of cell capacity as measured by the number of supported users, assuming a fixed total transmit power at the base station. It is observed that enabling STS increases capacity by up to 80 % if all mobiles support STS, but capacity is reduced by up to 20 % when fewer than 35 % of the mobiles support the technique. The capacity loss results from interference of the diversity-antenna signal on mobiles that do not support STS; such interference causes an F-FCH transmit power increase of up to 1.5 dB in multipath Rayleigh-faded channels, as observed in lab experiments. PSTD, which does not require mobile-specific support, was
Keyphrases
cdma2000 standard transmit diversity technique mobile receiver required transmit power mobile-specific support mean forward-link fundamental-channel phase-sweep transmit diversity f-fch transmit power increase base station space-time spreading sts increase capacity supported user cell capacity kbps markov lab experiment fixed total transmit power forward-link transmit diversity technique diversity-antenna signal capacity loss result mobile support sts transmit power multipath rayleigh-faded channel
