SCMA multiuser detection algorithm based on threshold and interval filtering
In the scenario of high-throughput and large-scale connection applications for 5G communication users,sparse code mul-tiple access(SCMA)can be used to improve the communication quality of 5G smart scenes.In order to reduce the complexity of the detection algorithm in the SCMA system,a message passing algorithm based on a single threshold and interval range was proposed,which was set through multiple parameter combinations based on the Max-log-MPA algorithm.The threshold value was used to judge whether to participate in the algorithm iteration before the iteration calculation of the user information value.When the set con-dition was satisfied,the user information value could participate in the algorithm iteration process.In the iteration calculation pro-cess,the interval parameter was set again for filtering and selection,so that the user node value required for the communication sce-nario could participate in the calculation,and the user information could be decoded.Both parts of the parameters could filter the user information values to some extent,thereby achieving the goal of reducing the algorithm complexity.Simulation results show that the proposed algorithm is superior to the message passing algorithm(MPA)algorithm in terms of convergence speed and algorithm com-plexity.The bit error ratio(BER)performance loss can also be guaranteed.The algorithm has a flexible parameter combination scheme between BER performance and algorithm complexity,which has strong adaptability.
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