Joint effect of transmit power control and antenna diversity on spectrum efficiency of a cellular system

Fumiyuki Adachi, Akihito Katoh, Deepshikha Garg

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This paper addresses a classic question about whether transmit power control (TPC) can increase the spectrum efficiency of a TDMA system and an FDMA cellular system as in the case of a DS-CDMA cellular system. Two types of TPC schemes are considered; one is slow TPC that regulates the distance dependent path loss and shadowing loss, while the other is fast TPC that regulates multipath fading as well as path loss and shadowing loss. In addition to TPC, antenna diversity reception is considered. The allowable interference rise factor χ, which is defined as the interference plus background noise-to-background noise power ratio, is introduced. The simple expressions for the signal-to-interference plus background noise power ratio (SINR) at the diversity combiner output using maximal-ratio combining (MRC) are derived to obtain the reuse distance by computer simulations. The impact of joint use of TPC and antenna diversity reception on the spectrum efficiency is discussed. It is found that the joint use of fast TPC and antenna diversity is advantageous and larger spectrum efficiency can be achieved than with no TPC. On the other hand, the use of slow TPC is found advantageous only for small values of standard deviation of shadowing loss; however, the improvement in the spectrum efficiency is quite small.

Original languageEnglish
Pages (from-to)919-927
Number of pages9
JournalIEICE Transactions on Communications
VolumeE85-B
Issue number5
Publication statusPublished - 2002 May

Keywords

  • Antenna diversity reception
  • Cellular system
  • Spectrum efficiency
  • Transmit power control

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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