Title :
RF and system requirements for cable modem applications
Author_Institution :
Broadcom Corp., Irvine, CA, USA
Abstract :
Examines the critical RF and system requirements for high speed digital modem applications in a hybrid fiber coax (HFC) environment. An overview of the basic elements and modulation formats of the system including the RF tuner, IF amplifiers and frequency allocations for two-way transmission on a single cable are presented. Requirements for intermodulation distortion (IMD) and noise figure (NF) in a digital quadrature amplitude modulation (QAM) system are contrasted with the traditional analog NTSC format, which the cable systems were initially designed to support. Important RF system requirements for downstream and upstream data paths are presented.
Keywords :
coaxial cables; intermediate-frequency amplifiers; intermodulation distortion; modems; optical fibre communication; quadrature amplitude modulation; IF amplifiers; cable modem applications; digital quadrature amplitude modulation; downstream data paths; frequency allocations; high speed digital modem; hybrid fiber coax environment; intermodulation distortion; modulation formats; noise figure; system requirements; upstream data paths; Coaxial components; Hybrid fiber coaxial cables; Intermodulation distortion; Modems; Optical fiber cables; Quadrature amplitude modulation; Radio frequency; Radio spectrum management; Radiofrequency amplifiers; Tuners;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2000. Digest of Papers. 2000 IEEE
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-6280-2
DOI :
10.1109/RFIC.2000.854405
