Method for eliminating depolarization effect interference of dual-polarization dual-frequency fusion system
A dual-polarization and depolarization technology, applied in transmission systems, baseband systems, digital transmission systems, etc., can solve problems such as difficulty in implementation, high complexity, and lack of consideration of antenna deployment, reducing scanning complexity, The effect of improving alignment speed and improving MIMO diversity multiplexing performance
Active Publication Date: 2021-08-24
XIDIAN UNIV
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Although this method gives a scheme of how to select beams based on codebook and spectral efficiency after channel estimation, it does not take into account the actual deployment of antennas, resulting in the final selection of beams in the millimeter wave radio frequency band through digital and analog domain matrices. It can only be obtained after jointly calculating the spectral efficiency, which is very complicated. It is difficult to realize in practice, and it is difficult to guarantee the multiplexing gain of mmWave MIMO
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[0030] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] refer to figure 1 , the system for this example is a point-to-point wireless communication dual-polarization dual-band fusion system, which includes a base station and a user terminal, both of which include a channel estimation module, an intermediate frequency module, a C-band front-end module and a millimeter-wave radio frequency module.
[0032] The channel estimation module is used to calculate a channel estimation matrix, and calculate different polarization angles of arrival and cross-polarization ratios.
[0033] The intermediate frequency module is used for up-converting or down-converting signals.
[0034] The C-band front-end module includes a set of co-located C-band dual-polarized antenna arrays for communication with the base station, and the size of the antennas is larger than that of millimeter waves.
[0035] The millim...
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The invention discloses a method for eliminating depolarization effect interference of a dual-polarized dual-frequency fusion system. The method mainly solves the problem that the depolarization effect of an existing dual-polarized antenna causes low MIMO diversity multiplexing performance. The scheme is as follows that the method comprises the steps that during initial access, a base station end and a user end respectively carry out channel estimation in a C wave band; the base station estimates a signal arrival angle and a cross polarization ratio according to the channel estimation matrix to select a working frequency band; the base station and the user select a corresponding narrow wave beam set in the millimeter wave band according to the signal arrival angle in the C wave band and carry out wave beam scanning to obtain an optimal wave beam pair, and then millimeter wave band channel detection is carried out according to the optimal wave beam pair; and the base station side selects a precoding mode according to the millimeter wave cross polarization ratio, multiplies a precoding matrix with the millimeter wave channel estimation matrix, eliminates interference of a depolarization effect, and obtains a final receiving end equivalent channel matrix. According to the invention, the dual-polarization MIMO diversity multiplexing performance and the millimeter wave beam alignment speed are improved, and the method can be used for a dual-polarization dual-frequency fusion system.
Description
technical field [0001] The invention belongs to the technical field of mobile communication, and particularly relates to a method for eliminating depolarization effect interference, which can be used in a dual-polarization and dual-frequency fusion system. Background technique [0002] The dual-frequency fusion system consists of C-band and millimeter-wave frequency bands. Among them, the C-band has the characteristics of mature technology, complete infrastructure, strong signal penetration ability, and large coverage. Millimeter wave has the advantages of wide spectrum, high stability, and good directionality, so it has become one of the frequency bands used by the fifth-generation mobile communication 5G, and has also become a hot research topic. The dual-frequency fusion system can make full use of the advantages of the two frequency bands to improve the speed and stability of the communication system. [0003] Due to the increase in the number of antennas in the future ...
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IPC IPC(8): H04B7/0413H04B7/0456H04B7/06H04B7/08H04L25/02
CPCH04B7/0413H04B7/0456H04B7/0695H04B7/086H04L25/0224H04L25/0242Y02D30/70
Inventor 李晓辉李颖刘佳文石明利
Owner XIDIAN UNIV