×

ANTENNA DIVERSITY SYSTEM FOR RELATIVELY BROADBAND BROADCAST RECEPTION IN VEHICLES

  • US 20090042529A1
  • Filed: 07/10/2008
  • Published: 02/12/2009
  • Est. Priority Date: 07/10/2007
  • Status: Active Grant
First Claim
Patent Images

1. An antenna diversity system for receiving broadcast reception in vehicles, which comprises:

  • a receiver having an input and an output;

    a multi-antenna system having a plurality of antennas and an output comprising a reception signal for each of said plurality of antennas;

    a signal selection switch having an input for receiving at least two reception signals from said plurality of antennas, said signal selection switch for selection of a different reception signal, in terms of diversity, and wherein said signal selection switch has an output in a form of a selected reception signal which is passed to said receiver; and

    a diversity processor, which assesses a signal quality of the selected reception signal arriving at said receiver, and which is configured to activate said signal selection switch to pass a different reception signal, in terms of diversity, to said receiver, if interference occurs, by switching over, wherein said diversity processor is configured to receive said selected reception signal that is present in said receiver, having the relatively great frequency bandwidth B;

    and wherein said diversity processor is configured to determine a signal quality of said selected reception signal, by dividing its frequency bandwidth B into frequency intervals (Δ

    f), within which the frequency components of said selected reception signal (17) are essentially constant, in each instance, when multi-path propagation is present;

    wherein said processor comprises a frequency-interval-selective level detection component wherein said detection component separately detects a set of components of said selected reception signal that occur in said frequency intervals as frequency-interval-specific level values,wherein said processor comprises;

    an evaluation circuit wherein said set of components of said selected reception signal are separately compared with a signal level threshold that is required for interference-free reception, in said evaluation circuit that is a frequency-interval-specific level evaluation, and the interference rate of said selected reception signal is determined by means of evaluation of these measurements over all the frequency intervals (Δ

    f),wherein if interference is detected, said processor passes a different reception signal, in terms of diversity, in a form of a different selected reception signal having a lowest interference rate, to said receiver.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×