Patent ID: 11876552
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A control device for mitigating passive intermodulation, PIM, in a first network node, wherein said PIM is caused by radio signals transmitted from at least an adjacent network node, the control device being configured to:
i) receive at least an uplink, UL, radio signal comprising disturbance and desired signals and down-converting the received UL radio signal to a UL baseband signal, wherein the received UL baseband signal comprises detected information bits;
ii) apply a cyclic redundancy check, CRC, to the detected information bits of the received UL baseband signal, wherein the control device is configured
iii) in response to determining by the CRC that the UL baseband signal is detected correctly, directly output the detected information bits, and,
iv) 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;
v) apply a blind signal identification scheme on the residual signal of the UL baseband signal to obtain an estimate for a modeled PIM signal; and
vi) subtract the estimated modelled PIM signal from the received UL baseband signal as in 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.