A Novel Approach of Spreading Spectrum in OFDM Systems

Author

Tu, Pingzhou ; Huang, Xiaojing ; Dutkiewicz, Eryk

Author_Institution

Sch. of Electr. Comput. & Telecommun. Eng., Wollongong Univ., NSW

fYear

2006

fDate

Oct. 18 2006-Sept. 20 2006

Firstpage

487

Lastpage

491

Abstract

A method for spectrum spreading in an orthogonal frequency division multiplexing (OFDM) system is proposed in this paper, resulting in a spread spectrum OFDM (SS-OFDM) system suitable for ultra-wideband (UWB) applications. By modifying the IFFT module in a conventional OFDM transmitter and interleaving the modulated signal samples within an OFDM symbol, the transmitted signal spectrum is spread greatly to realize spread spectrum communications. This method of spectrum spreading is also compared with that of the multiband OFDM (MB-OFDM) system. The SS-OFDM signal has the characteristics of a white noise, and its power spectrum density is constant within the desired bandwidth. One of the main advantages of the proposed system is that it can be used for UWB communication without the need for frequency hopping. In addition, the transmitted signal bandwidth can be selected flexibly to meet different system requirements

Keywords

OFDM modulation; matrix algebra; spread spectrum communication; ultra wideband communication; white noise; OFDM systems; UWB; modulated signal samples; multiband OFDM; orthogonal frequency division multiplexing; power spectrum density; spread spectrum OFDM; transmitted signal bandwidth; transmitted signal spectrum; ultra-wideband applications; white noise; Bandwidth; Channel capacity; Interleaved codes; OFDM modulation; Peak to average power ratio; Power system reliability; Spread spectrum communication; Transceivers; Ultra wideband technology; White noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Information Technologies, 2006. ISCIT '06. International Symposium on

Conference_Location

Bangkok

Print_ISBN

0-7803-9741-X

Electronic_ISBN

0-7803-9741-X

Type

conf

DOI

10.1109/ISCIT.2006.339994

Filename

4141433