MaxLinear warns of digital TV interference from LTE networks

01 October 2013

Photo credit - Philips

A white paper demonstrates how, without protection, LTE bands adjacent to digital TV bands can create signal disruptions.

As countries around the world shut off analogue terrestrial TV services and switch to all-digital transmission, TV signal interference caused by proximity to 4G LTE signals could disrupt programmes.

Digital television frequency bands adjacent to LTE bands, as is the case with the 700 and 800MHz LTE frequency bands, says MaxLinear, have a high likelihood that LTE signals can interfere with TV signals. The company says that digital TVs and set-top boxes must have sufficient interference rejection capabilities in the tuner, or additional signal filtering to eliminate the problem. Some countries that have recently deployed LTE services are finding that the cost can be up to $500 per home to fix the problem retroactively.

The whitepaper, LTE Interference on Digital TV in Brazil, measured LTE interference in five use cases that involved indoor/outdoor digital TV antennas in the presence or absence of a booster (amplifier). Four of the use cases were for single-family homes, and the fifth was for a multi-dwelling unit scenario.

Critical receiver performance parameters were taken into consideration, including sensitivity, maximum signal strength and receiver linearity. The paper discusses possible mitigation techniques, such as those offered by the company, which can result in robust receiver performance even in the presence of a harsh LTE interferer.



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