Original document(23 pages) Authorized document(22 pages) 中文版
    A cable modem (20) including a demodulator (25) having an improved carrier recovery circuit (35) is disclosed. The cable modem (20) demodulates phase-modulated signals, including phase and amplitude modulated signals such as quadrature amplitude modulation (QAM) information. The carrier recovery circuit (35) includes a phase detection function (40), preferably realized by way of programs executed by a digital signal processor, that generates a derivative signal (g(x'')) based upon a summation of a complex function of a corrected input signal (x'') over some or all of the possible points in the modulation constellation.
Application Number
申请号
99120729 Application Date
申请日
1999.09.24
Title 名称 Improved phase estimation for use in reinsertion of phase-modulated signal carrier such as quadrature-amplitude modulated signal carrier
Publication Number
公开号
1265547 Publication Date
公开日
2000.09.06
Approval Pub. Date 2004.03.31 Granted Pub. Date 2004.03.31
International Classification 分类号 H04L27/34
Applicant(s) Name
申请人
Texas Instruments Inc.
Address 地址
Inventor(s) Name 发明人 A. Gatheler
Attorney & Agent 代理人 sun jingguo

  
Procedure for access control of radio resource for use on up-link group transmssion
Network communication system
Method and system for compensating channel dustortion using lagrange's polynomial interopolation method
Demodulator, modulator circuit and demodulating, modulating method
Orthogonal frequency division multiplex ransmitting/receiving system
Navigation warning signal receiver
Automatic control method of power supply for a complete set of electric appliance or instruments
Power supply control equipment and method
Method for manufacture of surface acoustic wave device
Photoelectrically coupled phase inverter circuit
Note:All patent data come from State Intellectual Property Office of the People's Republic of China. If there were discrepancies between here and the State Intellectual Property office, the later is more accurate. The patent data is only for public exchange and learning purposes. We are not responsible for the adverse consequences with unverified use of the data.