Radiated emission limits to protect digital wireless communication systems


  • Stenumgaard Peter

Publish date: 2004-01-01

Report number: FOI-R--1527--SE

Pages: 31

Written in: English


Present international limits for maximum levels of unintentional radiated emission from electronic devices are developed to protect analog communication services. The international standardisation work to develop such limits to protect digital communication services has been slow in progress. One technical difficulty is to decide what measurement detector to use to verify that given limits are met. The difficulty has been to find a measurement detector with a response that is proportional to the disturbance effect on a digital communication system subjected to the measured disturbance signal. Within the VOLGA project the RMS (Root-Mean Square) detector has been proposed, which has created great interest in the international standardisation authority CISPR (International Special Committee on Radio Interference). Therefore, the results from the VOLGA project have been incorporated in the CISPR activity within the area. The problem is important for the Swedish defence since it is necessary to be able to handle emission limits on COTS (Commercial off the Shelf) co-located with digital wireless communication systems. In this report, a complete proposal of emission limits is put forth for the RMS detector. This is done by considering a number of modern digital communication services as well as developing a co-location scenario where disturbing electronics is located in the vicinity of a modem digital communication system. The emission limits determined falls below the present levels for commercial electronics but above the present limits for military specified electronics.