A blind adaptive beamforming for OFDM system

Author

Liu, Hongwu ; Feng, Quanyuan

Author_Institution

Southwest Jiaotong Univ., Sichuan

fYear

2005

fDate

1-4 May 2005

Firstpage

1208

Lastpage

1211

Abstract

This paper presents a blind adaptive beamformer in an OFDM system for burst interference suppression. The proposed algorithm is based on the least square-constant modulus algorithm (LS-CMA), which exploits the constant modulus property of the OFDM data carriers. The algorithm is consisted of: (1) compensating channel characters by pilot-symbol-assisted estimation. (2) updating the filter coefficients of adaptive beamformer with LS-CMA. Computer simulations show that: (1) the proposed algorithm is capable of rejecting co-channel interference that affects OFDM system, and (2) the BER performance is better than that of OFDM with common constant modulus (CM) beamformer

Keywords

OFDM modulation; array signal processing; channel estimation; cochannel interference; error statistics; interference suppression; least squares approximations; wireless channels; BER; OFDM system; blind adaptive beamforming; burst interference suppression; cochannel interference; compensating channel characters; constant modulus beamformer; filter coefficients; least square-constant modulus algorithm; pilot-symbol-assisted estimation; Array signal processing; Bit error rate; Interchannel interference; Interpolation; Intersymbol interference; OFDM; Radiofrequency interference; Time domain analysis; Wireless LAN; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2005. Canadian Conference on

Conference_Location

Saskatoon, Sask.

ISSN

0840-7789

Print_ISBN

0-7803-8885-2

Type

conf

DOI

10.1109/CCECE.2005.1557194

Filename

1557194