A subchip multipath search method for DSSS system based on Fractional Fourier Transform

Author

Tang, Xun ; Sha, Xue-Jun ; Wen, Rong-Hui

Author_Institution

Commun. Res. Center, Harbin Inst. of Technol., Harbin

fYear

2009

fDate

3-6 May 2009

Firstpage

433

Lastpage

436

Abstract

A subchip multipath search method for DSSS system based on fractional Fourier transform(FrFT) is proposed. Chirp signal is used as pilot signal, the multipath chirps are processed by FrFT at receiver, then the relative delays between multipath chirps can be calculated after detecting peak positions in FrFT domain according to the linear relationship between the relative delay in time domain and difference between peak positions of multipath chirps in FrFT domain. The search resolution is equal to reciprocal of the bandwidth of chirp signal, so the chirp signal with bandwidth larger than that of DSSS signal should be used to resolve subchip multipath. Simulation results show that the proposed method can calculate the relative delays of subchip multipath effectively.

Keywords

Fourier transforms; signal processing; spread spectrum communication; DSSS system; chirp signal; fractional Fourier transform; multipath chirps; subchip multipath search; Bandwidth; Chirp; Delay effects; Delay estimation; Filtering algorithms; Fourier transforms; Multiple signal classification; Search methods; Signal processing; Spread spectrum communication; Chirp signal; Fractional Fourier Transform; Subchip Multipath Search;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2009. CCECE '09. Canadian Conference on

Conference_Location

St. John´s, NL

ISSN

0840-7789

Print_ISBN

978-1-4244-3509-8

Electronic_ISBN

0840-7789

Type

conf

DOI

10.1109/CCECE.2009.5090170

Filename

5090170