Patent ID: 9300379
Filing Date: 2016-03-29
CPC Classification: H04B

Claim Text:
1. A method in a first node for adapting a multi-antenna transmission to a second node over an effective channel, the effective channel having multiple inputs and at least one output, the first node and the second node being included in a wireless communication system, the method comprising the steps of: obtaining at least one symbol stream; determining a precoding matrix, wherein the precoding matrix matches the effective channel which is block diagonal and the precoding matrix has a corresponding block diagonal structure, and wherein the effective channel is intentionally set up to be block-diagonal by arranging a first antenna setup in the first multi-antenna system or a second antenna setup in the second multi-antenna system to obtain the block diagonal effective channel without tracking instantaneous channel conditions of a physical channel; precoding the at least one symbol stream with the determined precoding matrix to improve radio link performance of the effective channel; and transmitting the precoded at least one symbol stream over the effective channel to the second node.