| 摘要 |
A transmit power allocation method for computing a transmit beamforming W matrix for a N streams of data, the method has a first step of measuring a receive channel characteristic H matrix, a second step of decomposing the H matrix into a U matrix which is formed from the left eigenvectors of the H matrix, an &Sgr; matrix which is a diagonal matrix formed from the square roots of the eigenvalues of said H matrix and re-ordered by strength, and a VT matrix with rows comprising the right eigenvectors of H, such that U&Sgr;VT=H. The transmit beamforming W matrix is then formed from the re-ordered V matrix of the previous decomposition. Optional waterfilling methods for a plurality of subcarriers may then be done using either a minimum mean square error, an optimal signal to noise ratio, or any other waterfilling method which optimizes a desired metric, such as signal to noise ratio or minimum mean square error. |
