A unified approach to time diversity combining for fast frequency hopped NCMFSK-anti-jam processing

Author

Gulliver, T.A. ; Felstead, E.B. ; Ezers, R.E. ; Wight, J.S.

Author_Institution

Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, Ont., Canada

fYear

1994

fDate

2-5 Oct 1994

Firstpage

415

Abstract

Frequency hopping (FH) spread spectrum is used in communications systems to provide protection against jamming. With fast FH, there are L⩾1 hops per data symbol transmitted. In the presence of severe interference, additional protection can be obtained by processing the LM values obtained from the demodulator. This processing is termed diversity combining. Many powerful and robust types of diversity combining have been developed to reduce the effects of a large jamming signal on some of the L hops. In this paper, a survey of combining methods is presented. Simulation performance results are given for severe noise and multitone jamming (SJR=0.0 dB). It is found that bit error rates as high as 0.4 can be reduced to <0.1 for L<10 using any of several diversity combining methods

Keywords

coding errors; demodulation; demodulators; diversity reception; error statistics; frequency hop communication; frequency shift keying; interference suppression; jamming; military communication; pseudonoise codes; signal processing; spread spectrum communication; anti-jam processing; bit error rates; data symbol; demodulator; diversity combining; fast frequency hopped NCMFSK; jamming protection; military radio systems; multitone jamming; noise; simulation performance results; spread spectrum communications systems; time diversity combining; Bit error rate; Demodulation; Diversity methods; Diversity reception; Frequency diversity; Interference; Jamming; Noise robustness; Power system protection; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1994. MILCOM '94. Conference Record, 1994 IEEE

Conference_Location

Fort Monmouth, NJ

Print_ISBN

0-7803-1828-5

Type

conf

DOI

10.1109/MILCOM.1994.474006

Filename

474006