A Novel Precoder Design for OFDM Receivers in Unknown Fading Channels

Author

Hasegawa, Fumihiro ; Plataniotis, Konstantiotis N. ; Pasupathy, Subbarayan

Author_Institution

Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Toronto Univ., Toronto, ON

fYear

2008

fDate

1-8 March 2008

Firstpage

1

Lastpage

17

Abstract

This paper presents a novel precoder design for an orthogonal frequency division multiplexing (OFDM) system using a channel estimator. First, an asymptotically tight approximation of the pairwise error probability (PEP) error with channel estimation error is presented and is shown to improve the existing upper bound of the PEP. Using the proposed approximation, a near-optimal power allocation scheme is derived and investigated and a new precoding scheme is introduced to improve the bit error rate (BER) performance of the receiver assisted by a minimum mean square error (MMSE) channel estimator. Both experimental and theoretical results included in this paper show improvement in the BER performance of a receiver with channel estimators utilizing the introduced precoder and power allocation scheme.

Keywords

OFDM modulation; channel estimation; error statistics; fading channels; least mean squares methods; precoding; radio receivers; BER; MMSE; OFDM; OFDM receivers; bit error rate; channel estimator; minimum mean square error; near-optimal power allocation scheme; orthogonal frequency division multiplexing; pairwise error probability; precoder design; unknown fading channels; Bit error rate; Channel estimation; Diversity methods; Fading; Frequency estimation; OFDM modulation; Phase shift keying; Quality of service; Strontium; Upper bound;

fLanguage

English

Publisher

ieee

Conference_Titel

Aerospace Conference, 2008 IEEE

Conference_Location

Big Sky, MT

ISSN

1095-323X

Print_ISBN

978-1-4244-1487-1

Electronic_ISBN

1095-323X

Type

conf

DOI

10.1109/AERO.2008.4526425

Filename

4526425