CHANNEL ESTIMATION USING REFERENCE SIGNALS

摘要

Embodiments herein relate to a method in a radio network node (12) for estimating channel gain over frequencies of a bandwidth in a radio communications network (1), which radio network node (12) serves a user equipment (10) in the radio communications network (1). The radio network node (12) measures a first channel gain based on a received power of a sounding reference signal over a first set of frequencies from the user equipment (10), which first set of frequencies is comprised in the frequencies of the bandwidth. Furthermore, the radio network node (12) measures a second channel gain based on a received power of a received demodulation reference signal of a physical uplink shared channel over a second set of frequencies from the user equipment (10), which second set of frequencies is comprised in the frequencies of the bandwidth. The radio network node (12) then estimates a third channel gain over the frequencies of the bandwidth based on the measured first channel gain and the measured second channel gain.