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Avoiding cellular harmonics in the 5GHz WLAN bands

The most likely source of interference between closely colocated cellular and 5 GHz WLAN systems is the 3rd harmonics from the former. GSM1800 harmonics can fall into all of the lower 5 GHz band. Harmonics from either UMTS FDD band II or UMTS TDD transmitter can fall into part of the upper 5GHz band.

Apart from the obvious solution of using appropriate filters at the output of the transmitter another approach is possible.

Knowledge of the operating frequency of the cellular system can be passed to the WLAN so that is can avoid operating where harmonics interference is known to occur.

Reported by

PHILIPS ELECTRONICS UK LIMITED
PHILIPS RESEARCH LABORATORIES - 420-430 LONDON ROAD
CR9 3QR Croydon
United Kingdom
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