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Beam scanning method for beam width through superposition design of plurality of sub-beams

A beamwidth and beam scanning technology, applied in wireless communication, diversity/multi-antenna systems, space transmit diversity, etc., can solve the problem of not ensuring that users and the system can quickly establish a link connection, increasing the cell search delay, and reducing system capacity. and other problems to achieve the effect of reducing cell search delay, solving coverage gap problems, and reducing overhead

Active Publication Date: 2020-01-03
XI AN JIAOTONG UNIV
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Problems solved by technology

Therefore, there is still a certain coverage gap between initial user discovery and data transmission, which will prolong the waiting time for users to access the network. Links are built, and the system capacity decreases accordingly

Method used

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  • Beam scanning method for beam width through superposition design of plurality of sub-beams
  • Beam scanning method for beam width through superposition design of plurality of sub-beams
  • Beam scanning method for beam width through superposition design of plurality of sub-beams

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Embodiment Construction

[0048] The present invention provides a beam scanning method for designing beam width by superposing multiple sub-beams, including the following steps:

[0049] S1. When the base station broadcasts the pilot signal in the cell discovery phase, establish the expression for the minimum number of cell search delay and scanning beams, and cover the entire area through K beam scanning;

[0050] Assume that a frame duration T includes the cell discovery phase τ and the data transmission phase T-τ, where 0figure 2 Shown. Here, τ is expressed as the cell search delay. During the cell discovery phase, the base station broadcasts pilot signals, for example, the time for a search beam is T s , And the time to monitor user response is T p -T s , K times alternately, here, the pilot signal ratio is defined as

[0051] Then the cell search delay τ is expressed as a function of K (that is, the search time or the number of search beams) as:

[0052] τ=KT p =KT s / η (1)

[0053] due to figure 2 The K...

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Abstract

The invention discloses a beam scanning method for beam width through superposition design of a plurality of sub-beams. The beam scanning method comprises the following steps: when a base station broadcasts a pilot signal in a cell discovery stage, establishing an expression of cell search delay and the minimum number of scanning beams, and covering the whole area through K times of beam scanning;dividing NT array antennas into M sub-arrays by utilizing a one-dimensional uniform linear array, establishing a sub-array model, giving a total array response, analyzing a relationship between the number M of the sub-arrays and the minimum number K of scanning beams, and adjusting the direction of each sub-beam to realize flexible beam width scanning; and analyzing the relationship between the beamforming gain and the number of array antennas in the expected coverage area, and designing and optimizing the number K of beams with flexible widths to maximize the system capacity. According to the beam scanning method, the scanning number of the beams with the flexible width is optimized, and the expenditure of user discovery is reduced by designing the number of the beams with the optimal flexible width, and the system capacity is greatly improved, and the problem of a coverage gap between user discovery and data transmission is solved.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a beam scanning method for designing a beam width by superposing a plurality of sub-beams. Background technique [0002] With the rapid development of modern society, the number of new multimedia services and smart terminals continues to increase, making mobile communication systems increasingly demanding in terms of system capacity and data rate. The target capability index of 5G requires a peak value of 20Gbit / s, and the traditional ways to improve spectrum efficiency are no longer sufficient to cope with such a high capacity demand. Now the frequency band below 3GHz used is already congested, so millimeter waves have become a hot spot of attention , Millimeter waves with rich spectrum resources greatly ease the pressure on spectrum resources in current mobile communications. However, compared with traditional communication methods that use lower carrier f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/06H04W48/16
CPCH04B7/0413H04B7/0617H04B7/0695H04W48/16
Inventor 范建存刘雪莹许睿罗新民
Owner XI AN JIAOTONG UNIV
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