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Abstract
A co-channel interfering tone accompanying a microwave FM signal introduces nonlinear distortion in the demodulated output signal of the microwave active and passive discriminators. The percentage of distortion has been experimentally measured. It has been found that the interference-induced distortion increases almost linearly with the increase in the amplitude of the interfering tone relative to that of the signal when the interference is weak compared to the received signal. The smaller the frequency separation of the interference from the carrier, the higher is the distortion of the output signal. The experimental observation is in good agreement with the existing theory.
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Notes on contributors
Taraprasad Chattopadhyay
Taraprasad Chattopadhyay received his PhD degree from the University of Burdwan, West Bengal, in January, 1988. He joined the Department of Physics of the Visva-Bharati University as a Lecturer in December, 1986. Presently, he is a Reader in the same department. He carried out research work in the Kyoto University, Japan, in 1988–89 in optical communication with a scholarship from the Ministry of Education, Government of Japan. In 1991–92, he was an invited researcher of the Japan Research Development corporation when he carried out research on the design of high- frequency light modulator. In 1996, he was a researcher of the Association of international Education, Japan. He was a visiting associate of CSIR, New Delhi, during 1991–93. He has published 63 papers in national and international refereed Journals and in national and international conferences. He was a reviewer of international journals like Electronics Letters and Proceedings of the IEE (part-H). He has been selected a reviewer of IEEE (USA) Laser and Electrooptic Society Journals. His field of research interest is microwave and optical communications. He is a member of the IEEE (USA), LEOS society, and of IETE.
Sudipta Chattopadhyay
Sudipta Chattopadhyay received his BSc (Honours) degree in Physics from Burdwan University, Burdwan, West Bengal in 1997. He received his MSc degree in Physics from Visva- Bharati University, Santiniketan, West Bengal in 2000. He has been working for PhD degree in the department of Physics of Visva-Bharati University since July 2002, His principal field of research interest is microwave communication.