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Methods of data channel characterization and uses thereof

  • US 10,681,568 B1
  • Filed: 07/21/2018
  • Issued: 06/09/2020
  • Est. Priority Date: 05/28/2010
  • Status: Active Grant
First Claim
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1. A system comprising:

  • at least one software configured transmitter and at least one software configured receiver;

    said at least one transmitter and at least one receiver connected by an impaired data channel, said impaired data channel characterized by a 2D channel state;

    said impaired data channel comprising at least one reflector, each said at least one reflector comprising a reflector location, reflector frequency shift, and at least one reflector coefficients of reflection;

    each said at least one transmitter comprising a transmitter location and transmitter frequency shift;

    each said at least one receiver comprising a receiver location and receiver frequency shift;

    wherein said 2D channel state comprises information pertaining to relative locations, frequency shifts, and reflector coefficients of reflection of said at least one transmitters, receivers, and reflectors;

    said at least one transmitter configured to;

    use said at least one transmitter and at least one transmitter processor to transmit direct pilot bursts, said direct pilot bursts comprising a plurality of pilot symbols Ppt,pf transmitted as pilot symbol waveform bursts Ppt,pf·

    Wp(pt, pf), over a plurality of combinations of times pt and frequencies pf, where each said pt and pf are unique pilot time-frequency coordinates chosen from a two dimensional pilot time-frequency grid, and all said pilot symbol waveform bursts Ppt,pf·

    Wp(pt, pf) are mutually orthogonal waveform bursts derived from time and frequency shifted versions of a same pilot basis waveform Wp;

    said at least one receiver configured to receive at least said pilot bursts according to at least a two dimensional pilot time-frequency bin structure with bin sizes and bin-coordinate positions proportional to said time-frequency grid;

    wherein upon propagation through said impaired data channel, said direct pilot bursts then travel over at least one path, said at least one path comprising at least one of;

    a;

    direct pilot bursts traveling directly from said at least one transmitter to said at least one receiver; and

    b;

    replica pilot bursts comprising direct pilot bursts that have reflected off of said at least one reflector before reaching said at least one receiver, thereby producing direct waveform bursts that are further reflector time-delayed and reflector frequency-shifted at said at least one receiver;

    wherein at said at least one receiver, a resulting combination of any said transmitter frequency shifted and receiver frequency shifted direct pilot bursts and any said replica pilot bursts produces channel-convoluted pilot bursts;

    said at least one software configured receiver configured to use said bin structure to receive said channel-convoluted pilot bursts and use at least one receiver processor to determine said 2D channel state of said impaired data channel connecting said at least one transmitter and said at least one receiver.

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