Pulse or digital communications – Repeaters – Testing
Patent
1993-11-30
1995-06-06
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
375235, 375236, H04L 2730, H03H 730
Patent
active
054229090
ABSTRACT:
The present invention provides a downconverter method and apparatus for downconverting a multiphase modulated signal. The downconverter can be implemented in a multi-phase receiver such as a quadrature receiver. An analog-to-digital converter (103) converts an intermediate frequency signal to a digital signal at a sampling rate. A Hilbert transformation filter (104) and a delay element (105) connected in parallel provide respective passband quadrature and in-phase components of the digital signal. A digital translator (107) alters the passband quadrature and in-phase components based on a predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal. The digital translator (107) can be a pseudorandom sequence demodulator for demodulating a code division multiple access (CDMA) signal. Various types of DC estimation can also be provided in addition to automatic gain control.
REFERENCES:
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4582074 (1986-05-01), Whikehart
patent: 5001724 (1991-03-01), Birgenheier et al.
patent: 5001727 (1991-03-01), McDavid
patent: 5040240 (1991-08-01), Keegan
patent: 5204683 (1993-04-01), Auvray
patent: 5313493 (1994-05-01), Dutta
HSP43216 Halfband Filter Data Sheets, Harris Semiconductor, Jun. 1993, pp. 1-19.
HSP50016 Digital Downconverter Data Sheets, Harris Semiconductor, Nov. 1992, pp. 1-24.
"A Double Nyquist Digital Product Detector for Quadrature Sampling", IEEE Transactions on Signal Processing, vol. 49, No. 7, Jul. 1992, pp. 1670-1681.
"Quadrature Sampling with High Dynamic Range", IEEE Transactions on Aerospace and Electronic Systems, vol. AES 18, No. 4, Nov. 1982 pp. 736-739.
Love Robert T.
Rapala Bryan
Stewart Kenneth A.
Cangialosi Salvatore
Juffernbruch Daniel W.
Motorola Inc.
LandOfFree
Method and apparatus for multi-phase component downconversion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for multi-phase component downconversion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for multi-phase component downconversion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-992981