Telefonaktiebolaget Lm Ericsson (publ)

Vijay Venkateswaran

Peng Liu

Bo Göransson

Yu Liu

Fredrik Huss

Mark William Wyville

Haiying Cao

Bo Ai

Fanggang Wang

There is provided mechanisms for mitigating interference in a network node. A method is performed by a control device (). The method comprises receiving (S) radio signals comprising at least one desired signal and interference, estimating (S) a characteristic of the interference, wherein the estimation comprises calculating correlation statistics of power levels of frequency sub-bands comprising the interference with frequency sub-bands comprising the received radio signals. The method comprises determining (S) an interference suppression matrix to suppress the interference in the frequency sub-bands of the received radio signals based on the estimated characteristic of the interference, wherein the interference suppression matrix is further determined based on information from inter-band interference observed across distinct sub-bands of the received radio signals. The method comprises applying (S) the interference suppression matrix on the received radio signals to mitigate the interference from the received radio signals.

Method and control device for mitigating interference

There is provided mechanisms for mitigating passive intermodulation in a first network node, wherein said PIM is caused by radio signals transmitted from at least an adjacent network node. The method is performed by a control device. The method comprises receiving at least an uplink radio signal and down-converting the received UL radio signal to a UL baseband signal. The method applies a cyclic redundancy check, CRC, to detected information bits of the received UL baseband signal, wherein in response to determining by the CRC that the UL baseband signal is detected correctly, directly output the detected information bits. The method comprises in response to determining by the CRC that the UL baseband signal is incorrectly detected, determining a residual signal of the received UL baseband signal applying a blind signal identification scheme on the residual signal of the UL baseband signal to obtain an estimate for a modeled PIM signal. The method comprises subtracting the estimated modelled PIM signal from the received UL baseband signal as in the first step and updating the received UL baseband signal in an iterative process until CRC is detected correctly or until number of iterations exceeds a predetermined threshold.

Method for mitigating passive intermodulation and an apparatus therefor

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Västerås, Sweden

Vijay Venkateswaran