A method and device for blind detection of interference sources

Abstract

The embodiment of the invention provides a blind detection method and device for an interference source, and belongs to the technical field of wireless communication. The method is applied to a receiving end, and comprises the steps of: obtaining a pre-set number of alternative synthesis constellations, and, for each alternative synthesis constellation, finding out multiple constellation points; for each alternative synthesis constellation, taking the complex number formed by the coordinates of the multiple constellation points as the parameter value of a transmission signal in a log-likelihood blind detection algorithm formula, so that a calculated result is obtained and used as a log-likelihood result corresponding to the alternative synthesis constellation; and, in the log-likelihood results of the pre-set number of alternative synthesis constellations, selecting the alternative synthesis constellation corresponding to the maximum log-likelihood result, and taking the modulation mode corresponding to the selected alternative synthesis constellation as an interference signal modulation mode. When the signal modulation mode is a high-order modulation mode, the blind detection precision of the interference source is improved; and thus, the throughput gain of the NOMA in a practical application system can be ensured.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for blind detection of interference sources. Background technique [0002] Ultra-high-speed communication, mass terminal access and ultra-low transmission delay have become the core requirements of the fifth generation mobile communication system (the Fifth Generation, 5G). In order to meet these demands, NOMA (Non-orthogonal Multiple Access, non-orthogonal multiple access) has become one of the key technologies of 5G. The academic and industrial circles have demonstrated that the downlink NOMA is better than the downlink Orthogonal Multiple Access (Orthogonal Multiple Access). , OMA) has a great advantage in throughput performance. At present, most of the research on the performance of downlink NOMA technology is carried out when the target user knows the transmission information of the interference source, such as rank information, modulation...

AI Technical Summary

Problems solved by technology

For high-order modulation, since the traditional method only selects the point closest to the target signal in the candidate composite constellation for log-likelihood blind detection calculation, using this traditional interference source blind detection method will have a large error, making the blind The detection accuracy decreases, which affects the accuracy of NOMA's throughput gain calculation in actual systems

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