Optimization design method and system for multi-user multicarrier sparse spread spectrum sequence

Abstract

The invention discloses an optimization design method and system for a multi-user multicarrier sparse spread spectrum sequence, and the method comprises the steps: building a transmitting-receiving system model of a Gaussian multi-address access channel which takes the multi-user multicarrier sparse spread spectrum sequence as the design objective after the initialization of a Gaussian multi-address access transmitting end and related parameters, and calculating the single-user interaction information under the condition that the signal to noise is given; building an optimization model which maximizes the minimum single-user interaction information; setting the maximum number of iteration times, and obtaining a local optimal solution, corresponding to the optimization model which maximizes the minimum single-user interaction information, according to each randomly generated initial point through employing an internal point method till the maximum number of iteration times; selecting the solution with the optimal performances from the local optimal solutions generated at different initial points to approach to a global optimal solution, thereby obtaining the multi-user multicarrier sparse spread spectrum sequence with the given signal to noise ratio and the modulation mode. The method and system provided by the invention enable a coefficient spread spectrum sequence to be directly used for actual transmission.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an optimal design method and system for multi-user multi-carrier sparse spread spectrum sequences. Background technique [0002] In order to cope with the application scenarios of 5G air interface, especially the demands of intensive multi-user mass access and ultra-large capacity, in the reality of expensive and limited spectrum resources, non-orthogonal access technology is regarded as 5G air interface technology and also regarded as It is the evolution trend and breakthrough direction after 4G Orthogonal Frequency Division Multiple Access (OFDMA). The main reason for this type of technology trend is that the spectral efficiency improvement of point-to-point single link has approached the Shannon limit with the gradual evolution of existing modulation and coding technologies. From the perspective of non-single link, the system or network's total spectrum efficie...

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Problems solved by technology

In addition, the fairness of multiple access users is not considered in the traditional code division multiple access sequence design scheme, and the sequence design mostly uses the user and rate as the objective function, which will inevitably lead to unfairness among users

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