Multi-carrier spread spectrum and its relationship to single-carrier transmission

Author

Brüninghaus, Karsten ; Rohling, Hermann

Author_Institution

Inst. of Telecommun., Tech. Univ. Braunschweig, Germany

Volume

3

fYear

1998

fDate

18-21 May 1998

Firstpage

2329

Abstract

The combination of orthogonal frequency division multiplexing (OFDM) and code division multiplexing (CDM) has found great interest. In contrast to a conventional OFDM system the information is spread over several subcarriers using orthogonal codes which leads to a diversity gain in frequency-selective channels. In this paper it is shown that such a system is technically equivalent to a single-carrier system with a guard interval if the columns of a Fourier matrix are used as spreading codes. The pros and cons of such a system compared to an OFDM-CDM system with arbitrary spreading matrix are described and discussed

Keywords

OFDM modulation; diversity reception; matrix algebra; spread spectrum communication; subcarrier multiplexing; Fourier matrix; OFDM system; code division multiplexing; diversity gain; frequency-selective channels; multi-carrier spread spectrum; orthogonal codes; orthogonal frequency division multiplexing; single-carrier transmission; spreading codes; subcarriers; Code division multiplexing; Data communication; Dispersion; Diversity methods; Frequency diversity; OFDM; Radio transmitters; Receivers; Signal processing; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

Conference_Location

Ottawa, Ont.

ISSN

1090-3038

Print_ISBN

0-7803-4320-4

Type

conf

DOI

10.1109/VETEC.1998.686174

Filename

686174