DocumentCode :
3402929
Title :
Performance of an OFDM spread spectrum communications system using lapped transforms
Author :
Saulnier, Gary J. ; Mettke, Mike ; Medley, Michael J.
Author_Institution :
Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA
Volume :
2
fYear :
1997
fDate :
2-5 Nov 1997
Firstpage :
608
Abstract :
Two systems that use orthogonal frequency division multiplexing (OFDM) as a spread spectrum technique are described and their performance is evaluated in the presence of tone and pulsed Gaussian interference. One system obtains frequency diversity by sending the same data bat simultaneously on all the carriers while a second system obtains both time and frequency diversity by sequentially sending a given data bit on different carriers until it is sent on all possible carriers. Interference excision, in which some of the transform bins are removed in the detection process, are used in the receivers. Simulated BER performance in AWGN and interference is presented for systems that use a number of different block transforms and the modulated lapped transform (MLT) and it is shown that the MLT provides much better performance due to its ability to confine the interference energy to a few transform bins
Keywords :
Gaussian noise; coding errors; diversity reception; error statistics; frequency division multiplexing; interference suppression; jamming; modulation; spread spectrum communication; transforms; white noise; AWGN; OFDM spread spectrum communications system; block transforms; carriers; data bit; detection process; frequency diversity; interference excision; jamming; modulated lapped transform; orthogonal frequency division multiplexing; performance; pulsed Gaussian interference; receivers; simulated BER performance; tone interference; transform bins; Discrete Fourier transforms; Discrete cosine transforms; Discrete transforms; Fast Fourier transforms; Frequency diversity; Interference; Jamming; Laboratories; OFDM modulation; Spread spectrum communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
MILCOM 97 Proceedings
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4249-6
Type :
conf
DOI :
10.1109/MILCOM.1997.646693
Filename :
646693
Link To Document :
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