The Effect of Multirate Data Transmission on Spectral Efficiency in DS/CDMA Cellular Systems

Dong Hee KIM  Woong SUN  Keum Chan WHANG  

IEICE TRANSACTIONS on Communications   Vol.E83-B   No.5   pp.1144-1147
Publication Date: 2000/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
DS/CDMA,  multirate data transmission,  intercell interference,  

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In the third generation cellular radio system, a variable spreading factor (VSF) and a multi-code (MC) schemes are adopted to support multirate data transmission. Although these schemes affect the statistics of intercell interference and therefore the spectral efficiency, their precise impact is not completely understood. In this letter, a closed-form solution for the moments of the reverse link intercell interference is derived and the spectral efficiency is calculated from the solution. It is shown that the intercell interference gives a bad effect to the spectral efficiency as the portion of high rate user in a cell is increased.