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System, method, apparatus, and computer program for wireless communication

  • US 7,620,114 B2
  • Filed: 12/01/2004
  • Issued: 11/17/2009
  • Est. Priority Date: 05/10/2004
  • Status: Active Grant
First Claim
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1. A wireless communication system which carries out spatial multiplexing transmission with transmit and receive weights determined by utilizing a channel matrix with elements that are pairs of transmit antennas and receive antennas,the system comprising:

  • a first communication device including a transmit weight separator;

    a second communication device configured to weight a reference signal with a first weight matrix U* to produce a weighted reference signal and transmit the weighted reference signal to the first communication device, the first weight matrix U* including a conjugate matrix of a second weight matrix U and produce the first weight matrix U* based on singular value decomposition of the channel matrix H in a direction from the first communication device to the second communication device;

    the transmit weight separator is configured to receive the weighted reference signal from the second communication device and separate the weighted reference signal into a third weight matrix V and a diagonal matrix D; and

    the first communication device is further configured to weight data with the third weight matrix V to produce weighted data and transmit the weighted data to the second communication device.

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