A Cognitive Heterogeneous Cellular Network Interference Alignment Method Based on Cooperative Processing of Polarization-Space Domain Information

Abstract

The invention is a cognitive heterogeneous cellular network interference alignment method based on polarization-space information collaborative processing, which is used in the field of wireless communication. This method takes the cognitive heterogeneous cellular network including multiple small cell networks as the research object, takes the principle of the minimum mean square error of the signal received by the small cell users, and constrains that the interference signal power received by the macro cell users is lower than the interference threshold. The optimization model is used to solve the optimal polarization-space information collaborative processing matrix at the transmitting end and receiving end of the small cell network. The invention constructs an orthogonal projection filter at the receiving end of the small cell, eliminates the cross-layer interference from the macro cell, and optimizes the polarization-space coordinated precoding matrix and interference suppression of the sending end and the receiving end of the small cell with a heuristic method Matrix, which ensures the cross-layer interference constraints on macro cells and suppresses the same-layer interference between small cells, significantly improves the bit error rate performance of small cell networks, and at the same time improves the sum rate performance of cognitive heterogeneous cellular network systems .

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a cognitive heterogeneous cellular network system, in particular to a method for cognitive heterogeneous cellular network interference alignment based on polarization-space information collaborative processing. Background technique [0002] With the development of wireless communication technology and the popularization of wireless communication equipment, wireless mobile communication networks are faced with the problem that limited spectrum resources cannot meet a large number of business needs. In order to greatly increase the capacity of the cellular network, it will be a major development trend in the future to innovate the traditional macro-cellular network architecture and deploy multiple small-cell nodes with low power and frequency reuse to form a heterogeneous cellular network. On the one hand, the heterogeneous cellular network effectively improves the network capac...

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Problems solved by technology

For example, reference 2 [D.Li, C.Guo, Z.Zeng and X.Lin, "Dynamic Spectrum Sharing for TD-LTE and FD-LTE Users Based on Joint Polarization Adaption and Beamforming," in IEEE 79th Vehicular Technology Conference (VTC Spring ), Seoul, pp.1-5, 2014.] The publicized joint polarization adaptation and beamforming (JPAB, Joint Polarization Adaption and Beamforming) spectrum sharing method based on the collaborative processing of polarization-space information, for the first time excavated the small cell The polarization domain-space domain collaborative spectrum opportunity brought about by network dual-polarization MIMO antenna configuration can deal with cross-layer and same-layer interference in a staged and hierarchical manner. However, the calculation and solution of this method are complex, and the performance needs to be improved.

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