Title :
Synchronization in FH-MFSK spread spectrum systems
Author :
Defly, Koffi ; Wang, Xiande ; Wu, Geng ; Lecours, Michel
Author_Institution :
Dept. of Electr. Eng., Laval Univ., Quebec City, Que., Canada
Abstract :
The authors consider the synchronization at the frame level as well as at the chip level, in frequency hopping spread spectrum (FH-SS) receivers in order to maximize performance and minimize mutual interference in FH-SS systems. A sliding correlator is implemented for frame synchronization, which is also known as coarse synchronization or acquisition. A method is proposed to ensure fine synchronization (tracking) in the system. The principles of this method are presented and the resulting circuit is implemented and evaluated. The advantages compared to previous methods are the resulting circuits simplicity and performance. Although this circuit is implemented for MFSK (M-ary frequency shift keying), it can be used for an M-ary PSK (phase shift keying) signal since it is based principally on an energy detector
Keywords :
frequency agility; frequency shift keying; phase shift keying; radio receivers; spread spectrum communication; synchronisation; FH-MFSK spread spectrum systems; M-ary PSK; M-ary frequency shift keying; acquisition; chip level; coarse synchronization; energy detector; fine synchronization; frame level; frame synchronization; frequency hopping spread spectrum receivers; mutual interference; phase shift keying; sliding correlator; tracking; Circuits; Demodulation; Detectors; Frequency shift keying; Frequency synchronization; Frequency synthesizers; Matched filters; Mixers; Phase shift keying; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 1988, IEEE 38th
Conference_Location :
Philadelphia, PA
DOI :
10.1109/VETEC.1988.195389
