Commercial Wireless Solutions Week: Why is PIM Important?

by Molly Weis 20. February 2015 14:08

In the development of today’s communications networking applications, low passive intermodulation (PIM) ratings are increasingly recognized as one of the most critical requirements for optimum system performance in a wireless network infrastructure. API's range of filters all feature low PIM ratings with designs achieving PIM as low as -160dBc. 

Passive Intermodulation (PIM) in Wireless Network Infrastructures  In the development of today’s communications networking applications, low passive intermodulation (PIM) ratings are increasingly recognized as one of the most critical requirements for optimum system performance in a wireless network infrastructure. With the complexity of today’s mobile networks ever improving, designers of wireless telecom systems must find a way to tackle these increasingly stringent PIM requirements, as even the smallest levels of PIM distortion can significantly impact the network performance of our customers.In crowded environments, such as multi-tenant high-rise office buildings, large-scale public venues and other densely populated venues, where concentrated smart phone or device usage contributing to PIM generation is at a maximum, the tight requirements to combat PIM interference continue to grow. Intermodulation can occur whenever more than one signal is present in an RF system; when intermodulation occurs, a loss in data and the diminishment of cell phone network coverage occurs.API Technologies’ wireless communication filter solutions have been designed to meet the most stringent PIM requirements needed in today's wireless systems, with designs achieving PIM ratings as low as -160dBc, allowing for maximum reliability in wireless network connectivity.Passive Intermodulation and Wireless Data TransmissionWireless base stations use tightly grouped channels and complex modulation schemes to enable the transmission of vast amounts of data to and between their users. The modulating of RF signals is commonplace for the transmission of information across a network; unwanted PIM occurs as a byproduct whenever more than one signal (such as a Tx or Rx signal) is channeled through a single RF path. Since Rx signals are typically low power by nature, interference with regular voice and data traffic is likely to occur, especially in areas highly saturated by mobile phone or device usage. Unwanted PIM interference in a wireless network’s transmission channels results in loss of cellular reception and slow, ineffective data transfer.Protecting Your Network from PIM Disruptions The best way to reduce PIM interference in a network and preserve optimum network quality is to prevent the introduction of PIM sensitive devices in the first place. Wireless base stations should be equipped with only high quality, low PIM filters and components to provide the fastest and most reliable transmission of data possible.

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RF/Microwave & Microelectronics

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