We address the problem of performing optimum spatio-temporal processing when using adaptive antenna arrays at base stations for multiuser downlink transmission in CDMA systems, using periodic spreading sequences and assuming the knowledge of the channel of all the users. This assumption typically holds in TDD based mobile communication systems. We consider the SDMA strategy for using antenna arrays to gain system capacity. In that case the number of interfering users located in the same cell, namely d, can be higher than the spreading factor. The goal is to design FIR transmission filters at the base station in order to maximize the minimum matched filter bound among the d users. Several approaches, namely the zero-forcing, linear minimum mean square error, minimum output energy and the pre-rake are considered to solve the problem.
Spatio-temporal array processing for CDMA/SDMA downlink transmission
ASILOMAR 1998, 32nd IEEE Annual Asilomar Conference on Signals, Systems & Computers, November 2-5, 1998, Pacific Grove, USA
Systèmes de Communication
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