Multicell uplink spectral efficiency of coded DS-CDMA with random signatures

Benjamin M. Zaidel, Shlomo Shamai, Sergio Verdú

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

A simple multicell uplink communication model is suggested and analyzed for optimally coded randomly spread direct sequence code-division multiple access (DS-CDMA). The model adheres to Wyner's (1994) infinite linear cell-array model, according to which only adjacent-cell interference is present, and characterized by a single parameter 0 ≤ α ≤ 1. The discussion is confined to asymptotic analysis where both the number of users and the processing gain go to infinity, while their ratio goes to some finite constant. Single cell-site processing is assumed and four multiuser detection strategies are considered: the matched-filter detector, "optimum" detection with adjacent-cell interference treated as Gaussian noise, the linear minimum mean square error (MMSE) detector, and a detector that performs MMSE-based successive interference cancellation for intracell users with linear MMSE processing of adjacent-cell interference. Spectral efficiency is evaluated under three power allocation poli cies: equal received powers (for all users), equal rates, and a maximal spectral efficiency policy. Comparative results demonstrate how performance is affected by the introduction of intercell interference, and what is the penalty associated with the randomly spread coded DS-CDMA strategy. Finally, the effect of intercell time-sharing protocols as suggested by Shamai and Wyner (1997) is also examined, and a significant system performance enhancement is observed.

Original languageEnglish (US)
Pages (from-to)1556-1569
Number of pages14
JournalIEEE Journal on Selected Areas in Communications
Volume19
Issue number8
DOIs
StatePublished - Aug 1 2001

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Keywords

  • Capacity
  • Cellular communication
  • Code-division multiple access
  • Multiuser detection
  • Random signatures
  • Spectral efficiency

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