Title :
A unified approach to time diversity combining for fast frequency hopped NCMFSK
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
Abstract :
Frequency hopping (FH) spread spectrum is used in communications systems to provide protection against interference such as 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. 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 :
diversity reception; frequency hop communication; frequency shift keying; interference suppression; jamming; pseudonoise codes; spread spectrum communication; bit error rates; communications systems; demodulator; fast frequency hopped NCMFSK; frequency hopping spread spectrum; interference protection; jamming; multitone jamming; noise; simulation performance results; time diversity combining; Bit error rate; Demodulation; Diversity methods; Diversity reception; Frequency diversity; Interference; Jamming; Noise robustness; Power system protection; Spread spectrum communication;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1994. IEEE ISSSTA '94., IEEE Third International Symposium on
Conference_Location :
Oulu
Print_ISBN :
0-7803-1750-5
DOI :
10.1109/ISSSTA.1994.379573
