Closed-loop transmit diversity for FDD WCDMA systems

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

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 at the moment schemes exploiting a larger number of transmit antennas are being developed.

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 an FDD system this means that the receiver has to provide the information through some feedback mechanism.

In this paper we give a general algorithm by which it is possible to design a large variety of different closed-loop schemes depending on the feedback capacity of the system. The quantization of the transmit weights can be reduced to an eigenvalue problem by using linear functions of order statistics of the underlying probability distribution. This provides a simple analytical tool for the design of feedback algorithms. Furthermore, we provide analytical results for the transmit weights in the case of single-path Rayleigh fading channels.

AlkuperäiskieliEnglanti
OtsikkoCONFERENCE RECORD OF THE THIRTY-FOURTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS
ToimittajatMB Matthews
KustantajaIEEE
Sivut111-115
Sivumäärä3
ISBN (painettu)0-7803-6514-3
DOI - pysyväislinkit
TilaJulkaistu - 2000
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaAsilomar Conference on Signals, Systems & Computers - Pacific Grove, Yhdysvallat
Kesto: 29 lokakuuta 20001 marraskuuta 2000
Konferenssinumero: 34

Julkaisusarja

NimiCONFERENCE RECORD OF THE ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS
KustantajaIEEE
ISSN (painettu)1058-6393

Conference

ConferenceAsilomar Conference on Signals, Systems & Computers
LyhennettäASILOMAR
MaaYhdysvallat
KaupunkiPacific Grove
Ajanjakso29/10/200001/11/2000

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