Title :
Compensating frequency drift in DPSK systems via baseband signal processing
Author :
Choi, Zae Yong ; Lee, Yong Hoon
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
Abstract :
A new baseband signal processing method for compensating frequency shift in DPSK systems is introduced. This method consists of a signal processor for initial acquisition of the frequency shift and a simple adaptive equalizer for tracking. The former is based on the observation that the effect of the frequency shift can be eliminated by using boundary values of the received baseband signal between symbol periods. The latter is a single tap equalizer employing the least mean square (LMS) adaptation algorithm. Computer simulation results demonstrate that the proposed frequency shift compensation technique outperforms existing methods and works well for a wide range of frequency shifts
Keywords :
adaptive equalisers; demodulation; differential phase shift keying; least squares approximations; signal detection; signal processing; tracking; DPSK demodulation; DPSK detector; DPSK systems; LMS; adaptive equalizer; baseband signal processing; boundary values; computer simulation results; frequency drift compensation; frequency shift acquisition; frequency shift compensation; least mean square adaptation algorithm; received baseband signal; signal processor; single tap equalizer; symbol periods; tracking; Adaptive equalizers; Automatic frequency control; Baseband; Computer simulation; Degradation; Differential quadrature phase shift keying; Least squares approximation; Signal processing; Signal processing algorithms; Time division multiple access;
Conference_Titel :
Military Communications Conference, 1996. MILCOM '96, Conference Proceedings, IEEE
Conference_Location :
McLean, VA
Print_ISBN :
0-7803-3682-8
DOI :
10.1109/MILCOM.1996.571444
