Noise stability of the KAM-16 signal demodulator when transforming the boundaries of the signal constellation in a channel with multipath
https://doi.org/10.34680/2076-8052.2021.2(123).76-81
Abstract
The analysis of noise stability of a demodulator with quadrature amplitude modulation (KAM-16) in channels with multipath when changing the configuration of the boundaries of the signal constellation is carried out. The proposed method of analysis is based on the use of the vector algebra apparatus, which allows taking into account the fine structure of the multipath field, including the values of information symbols, delays of reflected signals, as well as their amplitudes and phases. The noise stability of reception was determined on the basis of integral distribution functions of signal distances to decision boundaries obtained by computer modeling. It is shown that the transformation of signal boundaries is effective only for small delays of reflected signals. Increasing the delay of reflected signals within the duration of sending significantly reduces noise stability. It is established that in a channel with multipath, the rotation of the decision boundaries can increase the noise immunity of the demodulator by 10 dB compared to the system without rotation.
About the Author
G. M. Sidelnikov
Сибирский государственный университет телекоммуникаций и информатики
Russian Federation
Russian Federation
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Review
For citations:
Sidelnikov G.M. Noise stability of the KAM-16 signal demodulator when transforming the boundaries of the signal constellation in a channel with multipath. Title in english. 2021;(2(123)):76-81. (In Russ.) https://doi.org/10.34680/2076-8052.2021.2(123).76-81
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