Transmitting beam forming method for unifying near field and far field in terahertz communication system

Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a near-far field unified transmitted beam forming method in a terahertz communication system. The method comprises the following steps: establishing a spherical wavefront transmitting beam model combining FDA technology and phased array with maximum transmitting power at a receiving target; establishing a transmitting beam half-power analytic model according to the established transmitting beam model; according to the current system parameter configuration, calculating a space coverage range of a current phased array transmitting beam pattern; comparing with a given coverage threshold, if the coverage exceeds the threshold, affirming that the communication belongs to a far field communication category at the moment, at the moment, needing to use a terahertz communication transmitting beam scheme combining an FDA technology and a phased array, and at the moment, taking a transmitting beam pattern analytical model as the generated transmitting beam analytical model; otherwise, it is affirmed that the communication scene belongs to the near field communication category at the moment, only a phased array transmitting beam scheme is used, and a phased array transmitting beam half-power analysis model is adopted at the moment. The method is low in complexity and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a transmitting beamforming method with unified near and far fields in a terahertz communication system. Background technique [0002] With the further advancement of 6G network technology, the number of mobile terminals has increased sharply, and various real-time interactive services (such as virtual reality (VR) / augmented reality (AR), automatic driving, tactile Internet (TI), etc.) have rapidly emerged. Within the next five years, terabit-per-second (Tbps) wireless links will become a reality. The terahertz frequency band in the 0.1-10THz frequency band is considered to be a potential key spectrum resource to provide reliable support for 6G network technology. Although the terahertz frequency band has extremely rich spectrum resources, the high frequency band makes terahertz communication face great free space loss, water molecule absorption attenua...

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Problems solved by technology

[0005] 1. At present, the industry does not have a unified array antenna near-field communication distance boundary model. The Fresnel area model is only the upper limit of the near-field communication distance. The far-field-near-field communication range is not clear, which will greatly reduce the reliability of communication;

[0006] 2. There are few near-field transmit beamforming schemes for terahertz communication, and because the near-field channel model is relatively complex, the use of traditional optimization methods or numerical methods will increase the complexity of the algorithm, and the above two schemes lack in-depth exploration of terahertz near-field The ability of large-scale array antennas to transmit beamforming inherent laws;

[0007] 3. Due to the large scale and high power consumption of TTD technology and FDA technology hardware, it is necessary to achieve high-precision transmit beam management in space, which will pose a severe challenge to the integration of large-scale terahertz array antenna systems;

[0008] Since terahertz near-field and far-field scenarios are usually studied separately, there is a lack of a unified terahertz communication far-field-near-field transmit beamforming scheme covering the full communication distance

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