Blind beamforming in frequency division duplex MISO systems based on time reversal mirrors

Author

Dahl, Tobias ; Kirkebø, Jan Egil

Author_Institution

Dept. of Informatics, Oslo Univ., Norway

fYear

2005

fDate

5-8 June 2005

Firstpage

640

Lastpage

644

Abstract

We propose a novel method for both downlink (DL) and uplink (UL) blind channel estimation and beamforming in frequency division duplex (FDD) MISO (multiple-input single-output) antenna systems. The method is related to the concept of time reversal mirrors (TRMs). The TRM is applied so that the subscriber unit (SU) uses the UL channel "doubly", and thus there is no transmission overhead. The method\´s performance is close to that of optimal beamforming. With four antennas at the base station (BS) there is a gain in the range of 2-3 dB relative to a typical space-time block coder without feedback.

Keywords

MIMO systems; antenna arrays; array signal processing; blind equalisers; block codes; channel estimation; frequency division multiplexing; radio links; space-time codes; subscriber loops; FDD MISO antenna system; TRM; blind beamforming; downlink blind channel estimation; frequency division duplex; multiple-input single-output; space-time block coder; subscriber unit; time reversal mirror; uplink channel; AWGN; Additive white noise; Array signal processing; Blind equalizers; Downlink; Frequency conversion; Gaussian noise; Mirrors; Mobile antennas; Training data;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications, 2005 IEEE 6th Workshop on

Print_ISBN

0-7803-8867-4

Type

conf

DOI

10.1109/SPAWC.2005.1506218

Filename

1506218