Multi-user detection method for non-orthogonal multiple access system on basis of gradient tracing and multi-step quasi-Newton method technology

Abstract

The invention relates to a multi-user detection method for a non-orthogonal multiple access system on basis of a gradient tracing and multi-step quasi-Newton method technology. Compared with the priorart, the defects that multi-user detection is heavy in computing burden, low in efficiency and poor in precision are overcome. The multi-user detection method comprises the following steps: preprocessing of an uplink base station, wherein the base station receives signals sent by user devices to acquire equivalence channel coefficients for iterative detection initialization; and detection of active user devices, wherein the active user devices which send signals at T continuous time slots in a signal frame and the sent signals of the devices are iteratively detected out. According to the multi-user detection method, the gradient tracing thought is introduced into multi-user detection of the base station, orthogonal projection computing when the user devices send signal estimation values is avoided, and a Hessian matrix that multi-step gradient information approximates a target function is computed by adopting a multi-step quasi-Newton method; and on one hand, the second-order convergence is introduced, the precision of multi-user detection is improved, and on the other hand, the convergence speed is increased, and the computing burden of multi-user detection is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless communication signal detection, in particular to a non-orthogonal multiple access system multi-user detection method based on gradient tracking and multi-step quasi-Newton method technology. Background technique [0002] In the future, 5G mobile communication will support IoT application scenarios with massive connections, but it faces the following challenges: 1. Large-scale user equipment access results in a lack of spectrum resources, resulting in user data collisions caused by different users choosing the same time-frequency resources; 2. The back-and-forth transmission of scheduling messages generated by large-scale user equipment access results in a large amount of signaling overhead and high transmission delay. [0003] Non-orthogonal multiple access allows different users to superimpose transmission on the same time-frequency resource, which not only increases the number of user connectio...

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Problems solved by technology

[0011] The purpose of the present invention is to solve the defects of large amount of calculation, low efficiency and poor precision of multi-user detection in the prior art, an

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