شماره ركورد كنفرانس :
3926
عنوان مقاله :
Performance Investigation of the Modified Costas Carrier Recovery Loop for a QPSK Modulated Signal in the Presence of Co-Channel Interference
پديدآورندگان :
Heidarpour Ali Reza reza.heidarpour@ozu.edu.tr Department of Electrical and Electronics Engineering, Ozyegin University, Istanbul, Turkey , Montazerolghaem Mohammad Ali m.ali.m1368@aut.ac.ir Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran , Saberali S. Mohammad sm.saberali@eng.ui.ac.ir Department of Electrical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran
كليدواژه :
Carrier recovery , Co , channel interference , AFC loops , Costas loop , QPSK modulation
عنوان كنفرانس :
بيست و چهارمين كنفرانس مهندسي برق ايران
چكيده فارسي :
One of the important challenges in communication systems is drift in the carrier frequency of received signal due to the clock skew and Doppler effect. Every communication receiver requires an automatic frequency control (AFC) loop to estimate the carrier drift in the received signal. One of the well-known AFC loops in communication systems is the Costas loop. In this paper a modified version of Costas loop for binary phase-shift keying (BPSK) modulation is presented which is capable to estimate the carrier frequency of the quadratic phase-shift keying (QPSK) modulation and therefore significantly simplifies practical implementation. The performance of the modified Costas loop is investigated for the carrier recovery of a QPSK signal in the presence of a co-channel interference. Both simulations and analytical results illustrate that the modified Costas loop may estimate the carrier frequency drift of received signal when the desired signal is stronger than interference.
