Abstract
The article proposes a simple method from the point of view of computational costs for encoding a fractional number of bits per symbol with amplitude-phase modulation (APM). The presentation is performed in relation to the case when it is necessary to form the value of the specific transmission rate with an accuracy of up to a quarter of a bit per symbol. Algorithms for the operation of the encoder and decoder, the formation of a synchro signal and the amount of energy gain achieved by using this method are given. The proposed coding method was used in the development and modernization of high-speed modems, the tests of which confirmed the reliability of the results obtained.
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