A space-time coding scheme utilizing phase shifting antennas at RF frequencies

Author

Messier, Geoffrey G. ; Sutinjo, Adrian ; Hum, Sean V. ; Okoniewski, Michal

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada

Volume

4

fYear

2005

fDate

6/27/1905 12:00:00 AM

Firstpage

369

Lastpage

372

Abstract

We introduce a new technique for performing space-time coding by using a phase shifting antenna feed network to manipulate the transmitted signal at RF frequencies. The advantage of this scheme is that it allows space-time coding to be implemented with only one transmit chain and amplifier. A code-division multiple-access (CDMA) system that can use this method of space-time coding is described. The antenna feed network is presented along with a modified version of the Alamouti code that is suitable for this application. Imperfections in the antenna phase shifting are quantified using an error vector magnitude (EVM) measure. System level CDMA simulations are also used to evaluate the overall performance of this "RF space-time coding" technique. The results indicate a performance improvement equivalent to conventional space-time codes.

Keywords

antenna feeds; code division multiple access; space-time codes; Alamouti code; CDMA; RF frequency; code division multiple-access; error vector magnitude; phase shifting antenna feed network; space-time coding scheme; Antenna feeds; Base stations; Block codes; Dipole antennas; Diversity reception; Multiaccess communication; Radio frequency; Radiofrequency amplifiers; Receiving antennas; Transmitting antennas; Code division multiple access (CDMA); dipole antennas; error vector magnitude (EVM); phase shifting antenna feed network; space–time coding;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2005.857299

Filename

1518885