Determining similarity between channel estimations

A method in a wireless communication network, the method comprising:

• providing a plurality of channel estimates which are separated in time during a certain first time period;
• representing each channel estimate by a corresponding complex channel vector in a complex vector space, where each channel estimate constitutes an estimated channel for a radio channel provided between at least two wireless communication nodes, where the radio channel constitutes a medium via which signals transmitted between nodes are transferred;
• and
• calculating a difference angle between two of the complex channel vectors which are separated in time during a certain second time period, forming a pair of complex channel vectors, where the difference angle is a Kähler angle (θK).

A computer readable medium storing a computer program, the computer program comprising computer executable instructions, the computer executable instructions being configured such that, upon execution by processing circuitry, the processing circuitry executes a method, the method comprising:

• providing a plurality of channel estimates which are separated in time during a certain first time period;
• representing each channel estimate by a corresponding complex channel vector in a complex vector space, where each channel estimate constitutes an estimated channel for a radio channel provided between at least two wireless communication nodes, where the radio channel constitutes a medium via which signals transmitted between nodes are transferred;
• and
• calculating a difference angle between two of the complex channel vectors which are separated in time during a certain second time period, forming a pair of complex channel vectors, where the difference angle is a Kähler angle (θK).