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An Approach to Using Amplitude Probability Distribution for Emission Limits to Protect Digital Radio Receivers Using Error-Correction Codes

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1 Author(s)
Kia C. Wiklundh ; Swedish Defence Research Agency (FOI), Linköping, Sweden

New emission limits are needed to protect digital communication systems from radiated interference. Current standard emission limits were developed to protect amplitude- and frequency-modulated analog radio services. However, developments in digital technology require emission limits adapted to protect digital radio communication services. An approach to define emission limits on the amplitude probability distribution (APD) of the envelope of an interference source has been presented earlier. This approach is derived for coherent radio receivers utilizing no error-correction codes. However, since the most important digital radio systems today use error correction, it is necessary to develop the method to handle coded systems as well. This paper proposes a method to define emission limits on the APD of the interference to protect coded communication systems. The method is a further development of previously proposed emission limits derived for an uncoded system, which is modified in accordance with the coding gain.

Published in:

IEEE Transactions on Electromagnetic Compatibility  (Volume:52 ,  Issue: 1 )