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A Weighted Delay Transmit Diversity System Combined with Antenna Diversity Reception for DS-CDMA Mobile Radio
Akihito KATO Eisuke KUDOH Fumiyuki ADACHI
IEICE TRANSACTIONS on Communications
Publication Date: 2003/07/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
transmit diversity (TD), transmit power control, fading, DS-CDMA, Rake combining,
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In this paper, we study a delay transmit diversity system combined with antenna diversity reception that transmits the time-delayed and weighted versions of the same signal from multiple antennas. At a receiver, multiple receive antennas are used and all delayed signals received on multiple antennas are coherently combined by a Rake receiver. The set of optimum antenna weights for maximizing the received signal-to-noise power ratio (SNR) after Rake combining is theoretically analyzed to show that the optimum solution is to transmit only from the best antenna that has the maximum equivalent channel gain seen after Rake combining. The bit error rate (BER) performance is theoretically analyzed and evaluated by computer simulation. The combined effect of transmit diversity and transmit power control (TPC) is also investigated.