Joint transmission (JT), an alternative rationale for the downlink of time division CDMA using multi-element transmit antennas

Author

Baier, P.W. ; Meurer, M. ; Weber, T. ; Troger, H.

Author_Institution

Res. Group for RF Commun., Kaiserslautern Univ., Germany

Volume

1

fYear

2000

fDate

36770

Firstpage

1

Abstract

In the 3^rd Generation Partnership Project (3GPP) time division CDMA (TD-CDMA) has been selected as the air interface for the TDD (time division duplexing) bands of 3^rd generation (3G) mobile radio systems. In the case of TDD the same channel impulse responses are valid for both the uplink and the downlink. In state-of-the-art TD-CDMA characterized by joint data detection (JD) this equality cannot be exploited for enhancing the system performance and reducing system complexity. A novel TD-CDMA downlink transmission scheme is proposed. This scheme is termed joint transmission (JT). It utilizes the knowledge of the channel impulse responses gained by channel estimation at the base station in such a way that channel estimators are no longer required at the mobile stations and the computational expense of data detection is dramatically reduced. The scheme easily lends itself to the utilization of multi-element transmit antennas. Further, its application is not restricted to systems of the type TD-CDMA

Keywords

antenna arrays; cellular radio; code division multiple access; computational complexity; data communication; frequency division multiple access; multi-access systems; multiuser channels; parameter estimation; radio links; signal detection; time division multiple access; transient response; transmitting antennas; 3^rd Generation Partnership Project; 3G mobile radio systems; 3GPP; FDMA; ISI; Joint transmission; TD-CDMA; TDMA; air interface; antenna array; base station; channel estimation; channel impulse response; computational expense reduction; data detection; downlink; intracell multiple access interference; joint data detection; mobile stations; multi-element transmit antennas; system complexity; system performance; time division CDMA; time division duplexing bands; time slotted CDMA; uplink; Base stations; Downlink; Intersymbol interference; Land mobile radio; Multiaccess communication; Multiple access interference; Radio transmitters; Signal generators; Time division multiple access; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on

Conference_Location

Parsippany, NJ

Print_ISBN

0-7803-6560-7

Type

conf

DOI

10.1109/ISSSTA.2000.878069

Filename

878069