DocumentCode :
1483415
Title :
New phase and frequency detectors for carrier recovery in PSK and QAM systems
Author :
Sari, Hikmet ; Moridi, Saïd
Author_Institution :
Lab. d´´Electron. et de Phys. Appl., Limeil Brevannes, France
Volume :
36
Issue :
9
fYear :
1988
fDate :
9/1/1988 12:00:00 AM
Firstpage :
1035
Lastpage :
1043
Abstract :
Phase and frequency detectors (PFDs) are presented that considerably extend the acquisition range of carrier-recovery loops in digital communication systems. Based on a simple modification of conventional phase detectors (PDs), the proposed detectors are applicable to a large variety of modulation schemes, including the popular PSK and QAM signal formats. Their application to QPSK and 16- and 64-QAM is extensively discussed, and simulated frequency-detector (FD) characteristics, as well as acquisition behavior of several PFDs, are reported for QPSK and 16 QAM. The results of an experimental evaluation using a 16-QAM laboratory modem are also reported which show that the detectors increase the acquisition range achievable by conventional PDs by more than one order of magnitude. In PSK, the improved acquisition performance is obtained with no penalty in steady-state phase jitter. In combined amplitude- and phase-shift keying, it generally leads to increased jitter, but this is easily avoided by incorporating a lock indicator and switching back to the original PD after lock is acquired
Keywords :
amplitude modulation; digital communication systems; phase shift keying; signal detection; 16-QAM; 64-QAM; PSK systems; QAM systems; acquisition range; carrier recovery; digital communication systems; frequency detectors; lock indicator; modem; phase detectors; simulated; steady-state phase jitter; switching back; Digital communication; Jitter; Laboratories; Modems; Phase detection; Phase frequency detector; Phase modulation; Phase shift keying; Quadrature amplitude modulation; Quadrature phase shift keying;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/26.7515
Filename :
7515
Link To Document :
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