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System and method for multiple-input multiple-output (MIMO) radio communication

  • US 7,194,237 B2
  • Filed: 07/25/2003
  • Issued: 03/20/2007
  • Est. Priority Date: 07/30/2002
  • Status: Expired due to Term
First Claim
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1. A method of simultaneously transmitting signals over a channel between a first device having N plurality of antennas and a second device having M plurality of antennas, the method comprising:

  • processing a vector s representing L signals [s1 . . . sL] with a transmit matrix A that is computed to maximize capacity of the channel by multiplying the vector s with the transmit matrix A, wherein the transmit matrix A is equal to VD, where V is an eigenvector matrix for HHH, H is the channel response from the first device to the second device, D=diag(d1, . . ., dL) and |dp|2 is the transmit power for p=1 to L; and

    transmitting with a power constraint for each individual transmit antenna path, wherein if N≦

    M, then D=I·

    sqrt(Pmax/N), with I as an identity matrix, such that the power transmitted by each of the N plurality of antennas is the same and equal to Pmax/N; and

    if N>

    M, then D=sqrt(d·

    Pmax/N)·

    I, such that the power transmitted by antenna i for i=1 to N is (d·

    Pmax/N)·

    (VVH)ii, and dp=d for p=1 to L.

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