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A Precompensation Method of Random Access Doppler Frequency Offset for Air-to-Ground Communication

A technology of Doppler frequency offset and random access, which is applied in multiplex communication, wireless communication, code division multiplexing system and other directions, and can solve problems such as difficulty in supporting random access.

Inactive Publication Date: 2020-01-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the existing LTE protocol, the maximum supported mobile speed does not exceed 500km / h, so it is difficult for current equipment to support random access in open-ground scenarios

Method used

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  • A Precompensation Method of Random Access Doppler Frequency Offset for Air-to-Ground Communication
  • A Precompensation Method of Random Access Doppler Frequency Offset for Air-to-Ground Communication
  • A Precompensation Method of Random Access Doppler Frequency Offset for Air-to-Ground Communication

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Embodiment

[0030] figure 1 It is a schematic diagram of a typical air-ground communication scenario. Such as figure 1 As shown, the scenario includes aircraft users and base stations. The frequency offset pre-compensation method in the embodiment of the present invention is executed by the aircraft user terminal.

[0031] figure 2 It is a flow chart of random access prefix frequency offset precompensation according to an embodiment of the present invention. according to figure 1 , the moving speed of the aircraft is v, the flying height is h, and the carrier frequency is f. The technical solution of the present invention will be described in detail below with regard to the present embodiment.

[0032] Step 201: Using the positioning system on the aircraft, the position of the base station can be obtained, so that the distance between the aircraft and the base station can be measured as d, and the cosine value of the angle θ between the velocity v and the carrier frequency f can be ...

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Abstract

The invention belongs to the field of wireless communication technology, and specifically relates to a precompensation method of random access Doppler frequency offsets for air-ground communication. The main method comprises the following steps: enabling an air user to obtain the distance between the air user and a ground base station; enabling the air user to calculate a Doppler frequency offset according to system parameters; judging whether the Doppler frequency offset obtained in step S2 is an integer frequency offset or a fractional frequency offset, if the Doppler frequency offset obtained in step S2 is the integer frequency offset, performing frequency offset precompensation for a random access prefix by cyclically shifting a ZC sequence; and if the Doppler frequency offset obtained in step S2 is the fractional frequency offset, generating a compensation sequence based on the specific frequency offset multiple, and multiplying the compensation sequence by the ZC sequence to perform precompensation. The precompensation method disclosed by the invention has the beneficial effect of solving the problem that the random access prefix has a severe Doppler frequency offset under an air-ground communication scene.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a precompensation method for random access Doppler frequency offset used in air-to-ground communication. Background technique [0002] In a mobile communication system, the relative movement of the transmitting and receiving parties will cause Doppler frequency deviation. Especially in the scenario of air-to-ground communication, since the mobile speed of the aircraft user can reach 1000-1200km / h, this high-speed movement will cause a lot of noise. Large Doppler frequency deviation greatly reduces the success rate of random access. [0003] According to the existing LTE protocol, the maximum supported mobile speed does not exceed 500km / h, so it is difficult for current equipment to support random access in open-ground scenarios. Contents of the invention [0004] The object of the present invention is to solve the above problems and propose a method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W74/08H04B7/185H04J13/00
CPCH04B7/18506H04J13/0062H04W56/0035H04W74/004
Inventor 何波辉李强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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