Case Study Identifying External Interference at Co-Located Cell Sites Complex Intermodulation Caused Poor Uplink RSSI It is well-understood that interference lowers signal-to-noise ratios (SNR), impacting cell-site performance and causing higher dropped calls and decreased throughput and accessibility. All of this can negatively affect customer retention. However, identifying the root cause of interference is not so trivial; it requires engineers to diligently inspect all aspects of a base station, including internal and external sources, including co-located cells. In some cases, complex intermodulation products due to co-location of towers can be a source of external interference. Identifying PIM as a source of external interference can be tricky and requires the right too

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