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Dynamically changing SCMA codebooks

Sparse code multiple access is a new method for non-orthogonal multiplexing proposed in the framework of the 5G concept development. Noise immunity of this method depends directly on the codebooks. The article reviews the method of forming dynamically changing complex numbers of SCMA codebooks depending on the signal noise ratio. The method is based on searching for the Euclidean distances between the codewords at which bit errors are minimized. Euclidean distances are found by calculating the Gauss error function. The high noise immunity of communication system built on the basis of the code books SCMA that are filled according to the proposed method, is presented.