Patent ID: 9306641
Filing Date: 2016-04-05
CPC Classification: H04B,H04L

Claim Text:
1. A multiple input multiple output wireless communication system, comprising: a precoding unit, receiving a plurality of transmission data streams and a quantized wireless channel information to provide a plurality of transmission symbols to a wireless channel; a channel estimation unit, estimating the wireless channel to provide a channel matrix having a plurality of complex numbered elements; a channel decomposition unit, decomposing the channel matrix and then providing a channel state information, wherein the channel decomposition unit performs a first matrix rotation to the channel matrix to convert the complex numbered elements in a diagonal into a plurality of real numbered elements, and determines whether the real numbered elements are divided into a plurality of computation parts based on the number of the real numbered elements in the diagonal, wherein when the real numbered elements are not divided into the computation parts, the channel decomposition unit equalizes the real numbered elements by using a singular value decomposition, a matrix decomposition, and an element permutation, when the real numbered elements are divided into a plurality of computation parts, one of the computation parts equalizes the real numbered elements by using the singular value decomposition, the matrix decomposition, and the element permutation, and remaining of the computation parts rotate the real numbered elements to be equal to a diagonal geometric mean through the singular value decomposition and a second matrix rotation, and the channel decomposition unit sequentially rotates a first unit matrix by column and sequentially rotates a second unit matrix by row based on a plurality of rotation angles of the first matrix rotation, the second matrix rotation, the singular value decomposition, the matrix decomposition, and the element permutation performed with the complex numbered elements to obtain the channel state information; and a quantization unit, providing the wireless channel information based on the channel state information.