Title :
An Improved Lock Detection Algorithm for Costas Loop
Author :
Nan, Zhu ; Wenquan, Feng ; Shilong, Zhang ; Suxiao, Liu
Author_Institution :
Sch. of Electron. & Inf. Eng., Beijing Univ. of Aeronaut. & Astronaut., Beijing, China
Abstract :
The Costas loop is the most common carrier synchronization structure in receiver using BPSK modulation. Reliable detection of carrier lock condition is important to the BPSK receiver. In this paper, an improved lock detection algorithm for Costas loop is proposed. First, the mathematical model and the hardware structure of the algorithm are proposed, and then theoretical derivation is given. Through the analysis of performance, the criterion of choosing lock threshold is presented. Simulation results show that using the signal power in normalization can eliminate the impact of input signal power changes. The algorithm work reliably when Es/N0>; 1dB, at this time, the estimation error of Es/N0 is less than 1dB. And it´s verified through a number of model experiments with good results.
Keywords :
demodulators; phase locked loops; phase shift keying; synchronisation; BPSK modulation; BPSK receiver; Costas loop; binary phase shift keying; carrier synchronization structure; estimation error; hardware structure; lock detection algorithm; lock threshold; mathematical model; normalization; reliable detection; signal power; Binary phase shift keying; Detection algorithms; Hardware; Noise; Receivers; Reliability; Tracking loops; Binary Phase Shift Keying; Costas loop; Demodulators; Lock Detection; Phase Lock Loops;
Conference_Titel :
High Performance Computing and Communication & 2012 IEEE 9th International Conference on Embedded Software and Systems (HPCC-ICESS), 2012 IEEE 14th International Conference on
Conference_Location :
Liverpool
Print_ISBN :
978-1-4673-2164-8
DOI :
10.1109/HPCC.2012.162
