Title :
A simple coherent receiver for frequency-hopped pulse-driven GMSK
Author :
Abbey, David D. ; Rhodes, Russell R.
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
Bandwidth efficient modulations are being considered to increase the throughput over existing MILSATCOM channels. Pulse-driven GMSK (PDGMSK), is a variation of Gaussian minimum shift keying (GMSK) that uses GMSK at the highest data rate and gradually devolves to symmetric differential phase shift keying (SDPSK) at slower data rates for simplified detection. By using a pulse amplitude modulation (PAM) representation of the PDGMSK signal, a near optimal receiver can be implemented using a single matched filter. For pure GMSK demodulation, we develop a simplified Viterbi receiver that approximates the response of the successive PAM components using scaled delayed samples from a single matched filter. Carrier phase recovery is accomplished each frequency hop with an initial reference sequence and a decision feedback phase tracking algorithm
Keywords :
Viterbi detection; delays; demodulation; differential phase shift keying; filtering theory; frequency hop communication; matched filters; military communication; minimum shift keying; pulse amplitude modulation; radio receivers; satellite communication; GMSK; GMSK demodulation; Gaussian minimum shift keying; MILSATCOM channels; PAM; PAM representation; SDPSK; Viterbi receiver; bandwidth efficient modulation; carrier phase recovery; coherent receiver; data rate; decision feedback phase tracking algorithm; detection; frequency-hopped pulse-driven GMSK; matched filter; near optimal receiver; pulse amplitude modulation; reference sequence; scaled delayed samples; symmetric differential phase shift keying; Amplitude modulation; Bandwidth; Demodulation; Differential phase shift keying; Frequency; Matched filters; Phase detection; Pulse modulation; Throughput; Viterbi algorithm;
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
DOI :
10.1109/MILCOM.1999.822689
