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Using antenna arrays in multipath environment

  • US 7,184,492 B2
  • Filed: 02/10/2003
  • Issued: 02/27/2007
  • Est. Priority Date: 02/10/2003
  • Status: Active Grant
First Claim
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1. A method of transmitting an information signal to a first mobile terminal comprising:

  • forming a plurality of directional beams, each directional beam oriented in a different direction and having a propagation delay;

    selecting two or more directional beams to use for transmitting the information signal to the first mobile terminal;

    for each selected directional beam, generating a transmit signal derived from the information signal for transmission to the first mobile terminal;

    transmitting the transmit signals to the first mobile terminal over respective ones of the selected directional beams; and

    compensating for differences in propagation delay between the selected directional beams such that the transmit signals arrive time aligned at the first mobile terminal;

    wherein compensating for differences in propagation delay between the selected directional beams comprises delaying transmit signals transmitted on at least one of the selected directional beams; and

    ,wherein forming a transmit signal for a selected directional beam comprises;

    determining a channel coefficient polynomial describing the estimated amplitude and phase attenuation associated with the selected directional beam; and

    prefiltering the information signal using the channel coefficient polynomial.

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