Title :
A high-precision AFC circuit applied to 64QAM point-to-multipoint burst communications
Author :
Akimoto, Yosuke ; Shirato, Yushi ; Wantanabe, Kazuji
Author_Institution :
NTT Access Network Service Syst. Labs., NTT Corp., Kanagawa, Japan
Abstract :
We propose a novel automatic frequency control (AFC) circuit suitable for 64QAM point-to-multipoint (P-MP) burst communications. The proposed AFC circuit calculates the phase rotation during a sufficiently long time and adopts the variable-gain least mean squares (VLMS) algorithm to estimate the carrier frequency offset. The proposed AFC circuit is implemented with approximately 50 kgates. Its complexity level is much lower than that of the conventional one. Computer simulation and experimental results confirm achieving the frequency error of 5.3×10-6, and that it is sufficient for developing a 64QAM-40-Mbaud system.
Keywords :
automatic frequency control; circuit complexity; field programmable gate arrays; frequency estimation; least mean squares methods; network analysis; network synthesis; quadrature amplitude modulation; telecommunication control; 64QAM point-to-multipoint burst communications; FPGA; automatic frequency control circuit; carrier frequency offset estimation; circuit complexity; high-precision AFC circuit; phase rotation; variable-gain LMS algorithm; variable-gain least mean squares algorithm; Automatic frequency control; Broadband communication; Circuits; Control systems; DSL; Degradation; Frequency estimation; Least squares approximation; Optical fiber networks; Optical fiber subscriber loops;
Conference_Titel :
Wireless Communications and Networking Conference, 2005 IEEE
Print_ISBN :
0-7803-8966-2
DOI :
10.1109/WCNC.2005.1424562
