Rake Combining Effect on Link Capacity and Peak Transmit Power of Power-Controlled Reverse Link of DS-CDMA Cellular Mobile Radio

Fumiyuki ADACHI  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.10   pp.1547-1555
Publication Date: 1997/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
cellular mobile radio,  DS-CDMA,  reverse link,  power control,  Rake combining,  

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For the power controlled DS-CDMA reverse link, two important issues must be addressed when using a Rake combiner with a limited path diversity order (defined as the number of resolved paths used for combining): the decrease in link capacity and the increase in peak transmit power. The peak transmit power is an important design parameter of transmit power amplifiers. In this paper, expressions for the achievable capacity and required peak transmit power under an multi-cell environment are developed. Based on the developed expressions, the relative capacity and required peak transmit power are evaluated theoretically and by Monte Carlo simulations under multipath Rayleigh fading environments with uniform and exponential power delay profiles. The effects of Rake based on maximal ratio combining (MRC) and selection combining (SC) are compared. The influence of the power delay profile shapes is also discussed.