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Non-orthogonal multiple access downlink transmission method for space array communication

A technology of non-orthogonal multiple access and transmission method, which is applied in the field of non-orthogonal multiple access downlink transmission of air array communication, and can solve the problem of limiting the number of air base stations and user access

Inactive Publication Date: 2019-02-19
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional method, a base station of a single radio frequency can only be connected to one airport base station or user in the same time domain / frequency domain / code domain, which greatly limits the number of airport base stations and user access

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  • Non-orthogonal multiple access downlink transmission method for space array communication
  • Non-orthogonal multiple access downlink transmission method for space array communication
  • Non-orthogonal multiple access downlink transmission method for space array communication

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Embodiment Construction

[0098] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0099] The present invention is a non-orthogonal multiple access downlink transmission method for air-to-air array communication. Taking the downlink transmission from a ground base station to an air-to-air base station as an example, the ground base station accesses multiple air base stations, and distinguish them in the power domain. The ground base station mixes multiple air-to-air signals, and each air-to-air base station makes a corresponding order according to the effective channel gain. The lower the channel gain, the higher the priority and the higher the allocated power. In this way, the serial interference cancellation (SIC) method is used for decoding at the receiving end, and signals with high priority are decoded first, and each adjacent base station only needs to decode signals with higher priority than itself, and in the mixed signal S...

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Abstract

The invention discloses a non-orthogonal multiple access downlink transmission method for a space array communication, and belongs to the technical field of space communication. The method comprises the following steps of: firstly, constructing a communication scene, the ground base station superimposes and transmits signals transmitted by the space base station, and superposed signals form a mixed signal; performing a millimeter wave directional communication between the ground base station and each of the space base stations to obtain a channel response vector corresponding to each space base station; selecting the channel response vector on the strongest path of the space base station as a valid channel response vector; making the appropriate sort of the effective channel gain by usingthe beamforming vector w, in connection with |h<1><H>w|<2> is greater than or equal to |h<2><H>w|<2>, a space base station 1 decodes to transmit a signal s2 and eliminates and re-decodes to transmit signal s1, the space base station 2 decodes to transmit a signal s2 and obtains the reachability of each space base station, when the sum of reachability is maximized designing the condition of constraints that the joint power allocation and beamforming need to meet, and solving the condition of constraints to obtain a scheme of power distribution corresponding to each space base station and a beamforming of the ground base station. According to the non-orthogonal multiple access downlink transmission method for space array communication, the spectrum efficiency is effectively improved, and thecalculation complexity is low.

Description

technical field [0001] The invention belongs to the technical field of air-to-air communication, in particular to a non-orthogonal multiple access downlink transmission method for air-to-air array communication. Background technique [0002] With the development of information technology, the demand for communication is increasing exponentially. Using near-space airships and low-altitude drones as airport base stations to serve ground users can effectively supplement and improve the existing communication systems. Because airships and UAVs have good mobility, they can quickly meet the communication business needs of specific areas, such as communication guarantee in remote areas, emergency communication in natural disasters, and communication services in areas with high business needs. [0003] On the one hand, in the traditional microwave frequency band, due to bandwidth limitations, it cannot meet the growing communication needs. The millimeter wave (30-300GHz) has abunda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04W72/04H04W72/08H04W72/54
CPCH04B7/0617H04W72/0473H04W72/542
Inventor 肖振宇曹先彬罗喜伶刘凯
Owner BEIHANG UNIV
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