Title :
A blind 1024-QAM demodulator for cable television
Author :
Kurakake, Takuya ; Nakamura, Naoyoshi ; Oyamada, Kimiyuki
Author_Institution :
Sci. & Tech. Res. Labs., NHK, Tokyo, Japan
Abstract :
A blind demodulator for 1024 quadrature amplitude modulation (QAM) is described. It uses a method that combines carrier recovery without decision-directed operation and decision feedback equalization by using a modified constant modulus algorithm (MCMA) to improve equalization. A prototype shows good 1024-QAM demodulation under multipath and frequency offset conditions. The demodulator also operates well in commercial hybrid-fiber-and-coaxial cable systems.
Keywords :
adaptive equalisers; cable television; coaxial cables; demodulators; hybrid fibre coax networks; quadrature amplitude modulation; blind 1024-QAM demodulator; cable television; carrier recovery; coaxial cable system; commercial hybrid-fiber system; equalization improvement; frequency offset condition; modified constant modulus algorithm; multipath offset condition; quadrature amplitude modulation; Blind equalizers; Cable TV; Circuits; Convergence; Decision feedback equalizers; Demodulation; Field-flow fractionation; Hybrid fiber coaxial cables; Quadrature amplitude modulation; TV broadcasting;
Conference_Titel :
Communications, 2004 International Zurich Seminar on
Print_ISBN :
0-7803-8329-X
DOI :
10.1109/IZS.2004.1287407
