Mismatched filtering of periodic quadriphase and 8-phase sequences

Author

Lüke, Hans Dieter

Author_Institution

Inst. of Commun. Eng., Aachen Univ. of Technol., Germany

Volume

51

Issue

7

fYear

2003

fDate

7/1/2003 12:00:00 AM

Firstpage

1061

Lastpage

1063

Abstract

Quadriphase and 8-phase sequences with good autocorrelation properties are required in higher order digital modulation schemes, e.g., for channel estimation or synchronization. Since such sequences with perfect periodic autocorrelation function exist only for a few lengths, mismatched filtering is discussed. Mismatched filtering entirely suppresses all sidelobes of the correlation function at the expense of a slightly reduced signal-to-noise ratio (SNR). We present new construction methods for quadriphase and 8-phase sequences which exist for many lengths and exhibit significantly lower SNR losses than any other known sequences.

Keywords

binary sequences; channel estimation; correlation methods; digital filters; quadrature phase shift keying; synchronisation; 8-PSK; 8-phase sequences; QPSK; SNR losses; channel estimation; higher order digital modulation; mismatched filtering; periodic autocorrelation function; periodic quadriphase sequences; quadrature phase shift keying; sidelobe suppression; synchronization; Autocorrelation; Channel estimation; Digital filters; Digital modulation; Discrete Fourier transforms; Equations; Filtering; Matched filters; Mobile communication; Signal to noise ratio;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2003.814207

Filename

1214826