SCMA codebook design method based on moth fire suppression algorithm
A technology of moths to flames and design methods, which is applied in the field of non-orthogonal multiple access system codebooks, to achieve the effect of improving the bit error rate and realizing simple effects
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[0025] The SCMA codebook design is regarded as the optimization of user codeword parameters, and the optimized objective function is the bit error rate function of the SCMA system, namely:
[0026]
[0027]
[0028] Wherein, f_BER represents the bit error rate function of the SCMA system, EbN0 represents the ratio of each symbol energy and noise energy spectral density in the SCMA codebook, F represents the factor graph matrix of the SCMA codebook, CB={CB 1 ,CB 2 ,...,CB J} represents the codebook set of each user, J represents the number of users in the SCMA system, K represents the number of resource blocks, d f Represents the number of users multiplexed on each resource block, S i Represents energy-normalized Nth-order user codewords of length M, E{||S i || 2} is the user code word S i energy of.
[0029] The expression of is as follows:
[0030]
[0031] According to the factor graph matrix, the codebook is obtained, so the codebook design problem becomes...
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