c-ONE PIM Canceler™Passive Intermodulation (PIM) interference occurs when the signals from multiple high-power transmitters interact, typically with objects in the environment, creating intermodulation products that can impact the uplink and severely degrade system performance. While PIM is not a new problem, the evolution of today's networks is exacerbating the problem with deployment of more frequency bands co-located that can combine to create intermodulation products in the uplink bands. When this sort of PIM strikes, operators are faced with a difficult decision whether to live with degraded uplink performance, reduce transmit power degrading downlink performance as well, or deploy a PIM cancellation solution.
ISCO’s patent pending c-ONE PIM Canceler™ algorithm does not need to know the source transmissions that create the PIM interference. This simplifies integration and results in a more robust solution since the sources may vary, change over time and may not be easily accessible at the point the PIM interference is occurring. Effectively cancelling out the harmful impacts of the PIM allows operators to run their networks at full power without sacrificing performance of the impacted bands.
ISCO's c-ONE PIM Canceler™ software can be integrated into the network either on a duplexed RF coax link between the antenna and RRU or at the baseband level on the CPRI fiber link between the RRU and BBU. Example bands where PIM is particularly problematic include AWS (Band 4/66) and PCS (Band 2/25), Lower 700 (Band 12 and Band 29), and 700 FirstNet (Band 12, Band 13, and Band 14).