Compensation for second order intermodulation in a homodyne rece

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

455317, H04B 126

Patent

active

057490511

ABSTRACT:
A homodyne radio receiving apparatus is provided for mitigating fixed or variable DC offsets produced by residual second order intermodulation terms due to unwanted signals. The homodyne radio receiving apparatus includes an antenna, an antenna by-pass filter, an RF amplifier and a quadrature downconverter. The quadrature downconverter for the complex base band is centered around a desired reception frequency so that the complex baseband signals lie around zero frequency. A supplementary total power detector is provided to measure the total received power through the antenna by-pass filter so that the unwanted terms caused by second order intermodulation are compensated. The compensation is achieved by feeding instantaneous power measurements to a signal processing unit along with the complex baseband signals. The signal processing unit then determines a complex compensation coefficient by correlating the power signal with the complex baseband signals. The complex compensation coefficient is then employed to subtract a weighted amount of the power signal from the complex baseband signals in order to cancel the unwanted second order intermodulation distortion terms.

REFERENCES:
patent: 5241702 (1993-08-01), Dent
patent: 5530929 (1996-06-01), Lindqvist et al.
patent: 5614904 (1997-03-01), Dent

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Compensation for second order intermodulation in a homodyne rece does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Compensation for second order intermodulation in a homodyne rece, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compensation for second order intermodulation in a homodyne rece will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-71397

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.