Abstract
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 language | English (US) |
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Article number | 588505 |
Pages (from-to) | 165-170 |
Number of pages | 6 |
Journal | Proceedings of the International Symposium on Wireless Communication Systems |
DOIs | |
State | Published - 1995 |
Event | 1995 IEEE Wireless Communication System Symposium, WCSS 1995 - Long Island, United States Duration: Nov 27 1995 → Nov 28 1995 |
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering
- Communication