Effectiveness of a Matched Filter to Cope With Harsh Phase and Amplitude Modulated EMI
Year: 2020
Type: article
Abstract: This article investigates the effectiveness of a matched filter to cope with continuous wave electromagnetic disturbances that are phase and amplitude modulated from wireless systems, e.g., binary phase shift keying and quadrature amplitude modulation. A wired communication channel between sender and receiver that uses nonreturn-to-zero-level data encoding is disturbed by those nearby wireless systems. A matched filter is used on the wired communication channel to filter out the additional unwanted wireless disturbance. The bit-error rate (BER) is calculated after filtering and decoding the received voltages and is used as a metric to compare different kinds of disturbances and different levels of sampling frequency. The results show that the matched filter is very effective when the carrier frequency of the disturbance is equal to an integer multiple of the bit frequency and when not equal to the sampling frequency. This sampling frequency is determined by the bit rate of the desired signal and the oversampling factor on which the matched filter is based. Finally, the filter gain at a BER of 0.1% is determined. This gain shows that an oversampling of 4 times per bit and using a matched filter already results in an average filter gain of 10-15 dB.
Institution: KU Leuven
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3044211604