Transmit diversity techniques provide attractive solutions for increasing downlink capacity in 3G systems within low-mobility environments. Open-loop and closed-loop transmit diversity modes with two transmit antennas have already been included into 3GPP WCDMA Release 4, and schemes exploiting a larger number of transmit antennas are being studied. System capacity can be increased from that of open-loop modes if the transmitter is equipped with additional side information of the downlink channel. In a frequency division duplex (FDD) system this requires a separate feedback channel.
In this paper we give two feedback signal designs and an algorithm to design corresponding transmit weights utilizing linear functions of order statistics of the underlying random process. Furthermore, we provide analytical results for the resulting SNR gains of WCDMA closed-loop transmit diversity modes in the case of single-path Nakagami-m and Ricean fading channels.
|Title of host publication||2002 IEEE SEVENTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS, VOLS 1-3, PROCEEDINGS|
|Number of pages||5|
|Publication status||Published - 2002|
|MoE publication type||A4 Article in a conference publication|
|Event||IEEE Symposium on Spread Spectrum Techniques and Applications - Prague, Czech Republic|
Duration: 2 Sep 2002 → 5 Sep 2002
Conference number: 7
|Conference||IEEE Symposium on Spread Spectrum Techniques and Applications|
|Period||02/09/2002 → 05/09/2002|