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There have been various receiver-based techniques for performance improvement of wireless communications systems. However, receiver-based techniques have a restricted application in the down-link because they increase computational complexity of the mobile station (MS). In this paper, a transmitter-based processing scheme for the down-link direct-sequence code division multiple access (DS/CDMA) systems with multiple transmit antennas is proposed. The proposed scheme uses a pre-RAKE method to exploit diversity gain and pre-decorrelating method to suppress multiple access interference (MAI) and multiple path interference (MPI). To make the total transmit power the same as that without pre-decorrelating processing, we present three power normalization methods and compare the performance of those with one another.
Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on (Volume:1 )
Date of Conference: 15-18 Sept. 2002