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Pre-coded diversity forward channel transmission system for wireless communications systems supporting multiple MIMO transmission modes

  • US 20070099578A1
  • Filed: 10/05/2006
  • Published: 05/03/2007
  • Est. Priority Date: 10/28/2005
  • Status: Abandoned Application
First Claim
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1. A multiple-input multiple-output (MIMO) wireless communications system comprising a transmitter and a receiver, a. the transmitter comprising:

  • i. a plurality of transmit antenna elements having a plurality of diversity characteristics for transmitting user data to the receiver;

    ii. a directional transmitter for acting on a first set of weight parameters to coherently combine those transmit antenna elements having a first common diversity characteristic into a first set of directional beams having the first diversity characteristic and for acting on a second set of weight parameters to coherently combine those antenna elements having a second common diversity characteristic into a second set of directional beams each having the second diversity characteristic, the first and second sets providing a plurality of independent MIMO channels for transmission of the user data between the transmitter and the receiver; and

    iii. a pilot generator associated with each transmit antenna element, for introducing a mutually orthogonal pilot symbol into the user data transmitted by its associated transmit antenna element along each beam in the associated set of directional beams; and

    b. the receiver comprising;

    i. at least one receive antenna element for receiving the first and second sets of directional beams;

    ii. a memory for storing the first and second sets of weight parameters;

    iii. a receive processor for determining a preferred beam in the first and second sets of directional beams based on the stored first and second sets of weight parameters; and

    iv. a reverse channel signaler for communicating to the transmitter the preferred beam;

    wherein the transmitter may transmit the user data intended for the receiver along the preferred beam to the receiver.

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