Title :
Serially concatenated convolutional coding for frequency-hopped PSK in partial-band jamming
Author_Institution :
Lincoln Lab., Massachusetts Inst. of Technol., Lexington, MA, USA
Abstract :
This paper presents results on the performance of the serial concatenation of a convolutional code and differentially encoded phase-shift keying (PSK) in the presence of partial-band white-noise jamming. Frequency hopping is used to combat the effects of the jamming. We assume that the carrier phase is constant over a hop, but varies randomly from hop to hop. An expanded trellis-based demodulator, which assumes a quantized phase offset, is used to provide nearly coherent performance. Iterative demodulation and decoding provides excellent performance at relatively low Eb/N0. A fixed block length is considered to limit the delay and processing requirements. We show that, consequently, there is a trade-off between nearly coherent reception and antijam (AJ) protection. That is, more symbols per hop provide better performance when the phase offset is unknown, but having more hops per code block enables better protection from jamming.
Keywords :
AWGN; concatenated codes; convolutional codes; demodulation; demodulators; differential phase shift keying; frequency hop communication; iterative decoding; jamming; modulation coding; AWGN; antijam protection; coherent performance; delay; differentially encoded phase-shift keying; expanded trellis-based demodulator; fixed block length; frequency-hopped PSK; iterative decoding; iterative demodulation; jamming protection; partial-band jamming; partial-band white-noise jamming; phase offset; processing requirements; quantized phase offset; serially concatenated convolutional coding; Concatenated codes; Convolutional codes; Demodulation; Frequency; Iterative decoding; Jamming; Laboratories; Phase estimation; Phase shift keying; Power system protection;
Conference_Titel :
MILCOM 2002. Proceedings
Print_ISBN :
0-7803-7625-0
DOI :
10.1109/MILCOM.2002.1179569