Title :
New AFC algorithm for a fully-digital MDPSK DS/CDMA receiver
Author :
Lei, Jing ; Ng, Tung-Sang
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
A new AFC algorithm is presented in this paper for correcting the sizable carrier frequency offset of a fully-digital MDPSK DS/CDMA receiver, which explores the power degradation at the correlator output and has an acquisition range of twice the symbol rate. To achieve fast frequency acquisition, the momentum steepest descent method and modified S-curve are employed in the algorithm. The simplicity of the algorithm makes it desirable for VLSI implementation. The performance of the proposed algorithm is also evaluated, and is compared with the Cramer-Rao bound and the results of other algorithms available in the literature
Keywords :
automatic frequency control; code division multiple access; correlators; differential phase shift keying; digital communication; spread spectrum communication; AFC algorithm; Cramer-Rao bound; VLSI implementation; acquisition range; carrier frequency offset; correlator output; fully-digital MDPSK DS/CDMA receiver; modified S-curve; momentum steepest descent method; power degradation; symbol rate; Automatic frequency control; Correlators; Degradation; Differential phase shift keying; Filters; Frequency estimation; Gaussian noise; Multiaccess communication; Power engineering and energy; Very large scale integration;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.922230
