×

Method and apparatus for radio system cochannel interference suppression

  • US 4,025,853 A
  • Filed: 02/12/1976
  • Issued: 05/24/1977
  • Est. Priority Date: 02/12/1976
  • Status: Expired due to Term
First Claim
Patent Images

1. In a radio communication system in which significant signal reception and demodulation is possible at one station from plural signal sources having the same nominal frequency, but only one of such sources is assigned for communication with such station and each source signal has modulated thereon a unique tone for that source as well as other frequencies, the system being characterized in that there are provided,a filter in the station for separating a band of frequencies, including the tones, from substantially all other frequencies in a received and demodulated source signal,a circuit for producing at least one reference frequency tone,a circuit for producing a digital signal to indicate the relative frequency spectrum positions of the separated tone signal from the filter and of the reference tone, anda circuit, responsive to the digital signal, for indicating whether or not the separated tone signal is the correct tone.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×