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One of the important areas of development of communication systems in the shortwave range is voice communication systems. An urgent task for such communication systems is to increase noise immunity, which allows increasing the range of the system, reducing power consumption and, as a consequence, the size and weight of the user device. The greatest noise immunity of voice communication lines in modern realities can be achieved by an approach that implements voice transmission in digital format, using voice codec to convert speech into a set of bits and back. In this case, the main way to increase the noise immunity of such communication systems is to reduce the probability of a bit error at the error correcting code output. The purpose of this work is to develop a methodology for determining the parameters of an error correcting code, synchronization sequences and direct spread sequence spectrum signal code construction, allowing to minimize the probability of a bit error for a given signal-to-noise ratio and channel model parameters for AWGN and multipath Rayleigh channels.
Varlamov et al. (Tue,) studied this question.
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