Reduced rank beamforming methods for SDMA/OFDM communications

Author

Kecicioglu, Balkan ; Torlak, Murat

Author_Institution

Dept. of Electr. Eng., Texas Univ., Richardson, TX, USA

Volume

2

fYear

2004

fDate

7-10 Nov. 2004

Firstpage

1973

Abstract

Spatial division multiple access (SDMA) allows reuse of frequency by multiple users to increase capacity. When combined with OFDM modulation, SDMA can operate on per-carrier basis. For instance, in an OFDM/SDMA system, MMSE receiver can be applied to each carrier to suppress cochannel interference (CCI). An alternative implementation of MMSE receiver includes reduced-rank processing which is shown to be effective to reduce complexity (AM, Haimovich, et al., 2000). In this paper, we study the reduced rank OFDM/SDMA receiver based on Krylov subspace approach. Simulations are used to show the effectiveness of the proposed reduced rank receiver in cellular OFDM/SDMA communications while reducing the implementation complexity.

Keywords

OFDM modulation; cellular radio; cochannel interference; computational complexity; interference suppression; least mean squares methods; radio receivers; space division multiple access; Krylov subspace approach; MMSE receiver; OFDM communications; SDMA communications; cellular communications; cochannel interference suppression; complexity reduction; reduced rank beamforming methods; spatial division multiple access; Additive white noise; Array signal processing; Bandwidth; Baseband; Covariance matrix; Gaussian noise; Interference; Multiaccess communication; OFDM modulation; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on

Print_ISBN

0-7803-8622-1

Type

conf

DOI

10.1109/ACSSC.2004.1399509

Filename

1399509