Combined effect of site diversity and fast transmit power control in W-CDMA mobile radio

S. Fukumoto, K. Higuchi, A. Morimoto, M. Sawahashi, F. Adachi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


This paper presents the combined effect of inter-cell site diversity and fast transmit power control (TPC) in the wideband direct sequence code division multiple access (W-CDMA) forward and reverse links based on laboratory and field experiments. In forward link inter-cell site diversity, we propose a two-step scheme that compensates for the transmit power of base stations (BSs) when forward link fast TPC is used to prevent a transmit power difference between the BSs that is caused by TPC bit errors from becoming larger. We also present a reverse link inter-cell site diversity scheme based on the two-step selection combining at a radio network controller (RNC) using the following reliability information: cyclic redundancy check (CRC) results calculated per selection period and signal-to-interference plus background noise power ratio (SIR) averaged over the interleaving length. Field experimental results at the average vehicular speed of approximately 30 km/h showed that the required transmit power of a mobile station (total transmit power of BSs) at the average bit error rate of 10-3 in the reverse (forward) link, when the inter-cell site diversity associated with two-cell sites was performed, was decreased by approximately 2.0 (0.3) dB compared to the case without site diversity.

Original languageEnglish
Pages (from-to)138-142
Number of pages5
JournalIEEE Vehicular Technology Conference
Publication statusPublished - 2000 Jan 1
Externally publishedYes
EventVTC2000: 51st Vehicular Technology Conference 'Shaping History Through Mobile Technologies' - Tokyo, Jpn
Duration: 2000 May 152000 May 18

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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