Space-time processing for increased capacity of wireless CDMA

Research output: Contribution to journalConference articlepeer-review


Spatial and temporal processing are combined to increase the capacity of CDMA-based wireless communications systems. Degrees of freedom provided by space-time processing are exploited to combat both fading and co-channel interference (the near-far effect). The following methods are formulated and studied: (1) space-time diversity, (2) cascade optimum spatial-diversity (RAKE) temporal, (3) cascade optimum spatial-optimum temporal, and (4) joint domain optimum processing. It is shown that, due to its interference cancellation capability, optimum combining provides significantly better performance than diversity processing. In particular, in a typical CDMA scenario with two antennas, the joint domain optimum combining system provides at least a 30% increase in capacity over diversity processing. Optimum combining may also be applied to compensate for imperfect power control of the signals received at the base station.

Original languageEnglish (US)
Article number588505
Pages (from-to)165-170
Number of pages6
JournalProceedings of the International Symposium on Wireless Communication Systems
StatePublished - 1995
Event1995 IEEE Wireless Communication System Symposium, WCSS 1995 - Long Island, United States
Duration: Nov 27 1995Nov 28 1995

All Science Journal Classification (ASJC) codes

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


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