×

Compensation for multi-path interference using pilot symbols

  • US 5,414,734 A
  • Filed: 01/06/1993
  • Issued: 05/09/1995
  • Est. Priority Date: 01/06/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. Circuitry for compensating a receiver for fading of signals propagating as frames of data from at least one transmitter that includes pilot symbol generation circuitry that provides a predefined plurality of pilot symbols in each frame of data transmitted to the receiver, said circuitry comprising:

  • (a) separating means, coupled to the receiver for input of a received signal, for separating the plurality of pilot symbols from a plurality of data symbols in each frame of data, producing a pilot symbol signal comprising said plurality of pilot symbols and a data signal comprising said plurality of data symbols, said pilot signal and said data signal being separate from each other;

    (b) delay means, coupled to receive the data signal, for delaying the data signal from a current frame until after the pilot symbol signal from at least one subsequent frame is received, said delay means thereby producing a delayed data signal;

    (c) pilot signal processing means, coupled to receive the pilot symbol signal, for determining an estimated channel impulse response for the plurality of pilot symbols in each frame of received signals;

    (d) interpolation filter means, coupled to receive the estimated channel impulse response for each frame of data and including storage means for storing an estimated channel impulse response from at least one prior frame, said interpolation filter means interpolating values of the estimated channel impulse response between the current and prior frames to determine, as a function of channel characteristics, an interpolated channel impulse response for each data symbol in a frame; and

    (e) decoder means, coupled to receive the interpolated channel impulse response and the delayed data signal, for recovering the data transmitted to the receiver as a function of the interpolated channel impulse response and the delayed data signal, thereby substantially compensating for fading and interference in the received signals.

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