Signal protection methods in channels with Nakagami fading

Abstract

Existing methods for modeling the quality of digital communications based on adaptive radio links usually assume the stationarity of the parameters of the investigated system and the method of frequencies’ group use. The possibilities of these methods are largely limited due to the complexity of calculating the posterior distributions of a hypothetical environment that occurs when a signal is received. As a result of this, at present, in engineering practice, there are few models that make it possible to evaluate the quality of quasicoherent reception of adaptive radio lines even in simple situations of orthogonal signals’ transmitting. The goal of this research is to develop a way to increase the noise immunity of communication in channels with fading under the Nakagami distribution law. Analytical dependences of the error probability and the radio link utilization coefficient on the permissible signal-to-noise ratio were obtained using intermittent communication in channels with fading according to the Nakagami distribution law. The method was developed to increase the noise immunity of communication in comparison with known reception methods. For example, with the fading depth 1.4, for the error probability 10–4, the energy gain will be more than 14 dB. The proposed method can be used to provide electronic protection in various communication systems.