Patent ID: 9160425
Filing Date: 2015-10-13
Classification: H04B,H04L

Abstract:
1. A method in a base station for phase compensation in beamforming in a multi-antenna Time Division Duplex (TDD) communication network, comprising the steps of: estimating, in a first transmission mode, a first phase shift between a first antenna port N estimating, in the first transmission mode, a second phase shift between the first antenna port N calculating a parameter (Δ) indicative of a difference between the first phase shift (φ+θ) and the second phase shift (φ+ξ); estimating, in a second transmission mode, a third phase shift between the first antenna port N calculating, in the second transmission mode, a fourth phase shift between the first antenna port N compensating, in the second transmission mode, the phase of input signal on the first antenna port N