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Method for optimizing spectral re-use

  • US 6,085,094 A
  • Filed: 08/27/1998
  • Issued: 07/04/2000
  • Est. Priority Date: 08/29/1997
  • Status: Expired due to Term
First Claim
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1. A method for optimizing spectral re-use between an interferer digital phase modulated cellular system utilizing a first transmitter/receiver configurable to operate substantially at a first frequency, and a desirable analog phase modulated cellular system utilizing a second transmitter/receiver configurable to operate substantially at a second frequency, the first and second transmitter/receivers being separated by a re-use distance, the method comprising the steps of:

  • determining a carrier-to-interference ratio (CIR) with reference to the re-use distance;

    setting an acceptable baseband signal-to-interference ratio (SIR);

    determining an interference reduction factor (IRF) as the ratio of the SIR to the CIR;

    determining an optimum frequency separation fd with reference to the power spectral density of the random phase angle, an interference-to-signal-carrier power ratio, and autocorrelation functions of the baseband phase modulated processes;

    configuring the first transmitter to operate substantially at the first frequency; and

    configuring the second transmitter to operate substantially at the second frequency, wherein the second frequency is substantially separated in bandwidth from the first frequency by at least the determined frequency separation fd.

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