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Downlink NOMA power distribution method for multi-beam LEO satellite communication system

A technology of a satellite communication system and an allocation method, which is applied in the field of downlink NOMA power allocation in a multi-beam LEO satellite communication system, achieves high throughput, improves downlink sum rate and spectrum utilization, and eliminates intra-beam interference effects.

Inactive Publication Date: 2021-03-30
天地信息网络研究院(安徽)有限公司
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Problems solved by technology

In the downlink NOMA power allocation problem of the traditional multi-beam LEO satellite communication system, the signal passes through the channel from the satellite to the user, only considering the interference within the beam, and lacks a clear grasp of the entire multi-beam LEO satellite communication system, resulting in the existence of resource allocation schemes There are many deficiencies, which are quite different from the real scene

Method used

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  • Downlink NOMA power distribution method for multi-beam LEO satellite communication system
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  • Downlink NOMA power distribution method for multi-beam LEO satellite communication system

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Embodiment 1

[0022] To establish an optimization function for maximizing system throughput, the optimization target provided by the present invention is satellite downlink and rate The constraints are in denotes the rate of the kth user in beam i, Indicates whether the j-th resource of the i-th beam is allocated to the k-th user of the beam, that is, Indicates that the j-th resource of the i-th beam is allocated to the k-th user of the beam, Indicates that the j-th resource of the i-th beam is not allocated to the k-th user of the beam, P max Indicates the total downlink power of the satellite, Indicates the power of the kth user in beam i, R min Indicates the user's minimum receiving rate requirement.

[0023] To calculate the satellite downlink sum rate, it is necessary to know the rate of the kth user in beam i The superposition code that sends the jth time-frequency resource block of the ith beam of the satellite to all user signals is expressed as in Denotes the pow...

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Abstract

The invention discloses a downlink NOMA power distribution method in a multi-beam LEO satellite communication system. The power distribution method comprises the steps: firstly constructing the downlink sum rate of a multi-beam LEO satellite, determining the rate of a kth user in a beam i and whether the jth resource of an ith beam is distributed to the kth user of the beam or not under the constraint conditions, and determining whether the jth resource of the ith beam is distributed to the kth user, wherein the i represents the jth resource of the ith wave beam to be allocated to the kth userof the wave beam and represents the jth resource of the ith wave beam not to be allocated to the kth user of the wave beam, the Pmax represents the total downlink power of the satellite and the powerof the kth user in the wave beam i, and the Rmin represents the minimum receiving rate requirement of the user; solving the maximum power distribution scheme of f (P) through a genetic algorithm; andfinally, configuring power values of all users in the multi-beam LEO satellite communication system according to the obtained power allocation scheme, and meanwhile, accessing the users to corresponding regions and allocating corresponding time-frequency resources. According to the invention, the downlink sum rate and the spectrum utilization rate of the system can be improved, so that the systemobtains the maximum throughput.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a downlink NOMA power allocation method in a multi-beam LEO satellite communication system. Background technique [0002] With the increasing wireless communication services and increasing user access requirements, the multi-beam LEO satellite communication system has received more and more attention from academia and industry due to its advantages of wide coverage, large access, and high spectrum utilization. focus on. Compared with MEO and GEO, the LEO satellite communication system has lower delay and power consumption, and is more widely used. For LEO satellites, how to effectively allocate the limited power on the star to ensure the communication quality has always been a hot topic in the field of satellite communication. [0003] However, when the signal is sent from the satellite to the user, it will experience severe co-channel interference. On the one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0408H04B7/185H04W52/14H04W52/24H04W52/28H04W84/06
CPCH04B7/0408H04B7/18543H04W52/146H04W52/241H04W52/282H04W84/06
Inventor 姚艳军赵靓陈国良贺超黄永华王欣茜陈田胡树楷曹山王昕章仁飞
Owner 天地信息网络研究院(安徽)有限公司
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