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System and method for reducing multipath distortion in wireless distance measurement systems

  • US 6,898,415 B2
  • Filed: 01/16/2001
  • Issued: 05/24/2005
  • Est. Priority Date: 01/16/2001
  • Status: Expired due to Fees
First Claim
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1. A wireless transmission system comprising:

  • a first wireless device including;

    a first receiver that receives a plurality of forward path radio frequency (RF) signals comprising a plurality of different carrier frequencies modulated with a modulation signal, the different carrier frequencies having approximately the same multipath transmission characteristics between the first and second wireless devices, a demodulator for detecting the modulation signal in said plurality of forward path RF signals, a synthesizer for generating a plurality of reverse path RF signals from the modulation signal, and a first transmitter for transmitting said plurality of reverse path RF signals, wherein the reverse path RF signals are phase coherent with the at least one forward path RF signal; and

    a second wireless device including;

    a second transmitter that transmits the plurality of forward path RF signals received by said first phase comparing the plurality of third RF signals and the plurality of reverse path RF signals.

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