Two-dimensional arrival direction measuring method suitable for large-scale MIMO system
A measurement method, two-dimensional wave technology, applied to direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve problems such as unfavorable engineering implementation, poor real-time performance, and high computational complexity
Inactive Publication Date: 2016-04-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, most of the above methods are proposed for one-dimensional angle of arrival estimation and cannot be directly used for two-dimensional angle of arrival estimation
The literature "WangA, LiuL, ZhangJ.Lowcomplexitydirectionofarrival(DoA)estimationfor2DmassiveMIMOsystems[C], GlobecomWorkshops(GCWkshps), 2012IEEE.IEEE,2012:703-707" proposed a low-complexity angle of arrival estimation method based on MUSIC, although the The method overcomes the drawbacks of the traditional MUSIC algorithm that requires two-dimensional angle search with high computational complexity, and has better performance in small-scale MIMO systems. However, this method still requires one-dimensional angle search. When deploying large-scale MIMO systems, It has high computational complexity and poor real-time performance, which is not conducive to engineering realization
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[0029] Use the present invention as figure 1 Shown M x × M y A method for the determination of the two-dimensional angle of arrival of a two-dimensional uniform rectangular antenna array. figure 1 There are M=100 antenna elements in total, and there are M in the x-axis direction x = 10 rows, there are M in the y-axis direction y= 10 columns. The signal wavelength λ is 0.375m, and the distance between adjacent array elements is d=λ / 2=0.1875m, that is, the distance between adjacent array elements in the x-axis direction is half the carrier wavelength, and the distance between adjacent array elements in the y-axis direction The spacing is half the carrier wavelength. In this embodiment, there are K=2 narrow-band non-coherent incidents to the antenna array in different directions, that is, the number of signal sources K=2, wherein the azimuth and elevation angles of the first incident signal are 20° and 40° respectively ; The azimuth and elevation angles of the second incide...
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The invention discloses a two-dimensional arrival direction measuring method suitable for a large-scale MIMO system, and belongs to the technical field of infinite mobile communication. A two-dimensional uniform rectangular antenna array based on Mx*My is executed through the following steps of establishing a received signal covariance matrix based on received signals, obtaining a signal subspace through the covariance matrix, dividing the antenna array into four sub-arrays to obtain corresponding signal selection subspaces, obtaining a rotary matrix, and finally determining a pitch angle and a direction angle of a signal source. Under the large-scale MIMO scene, small measurement errors exist, and plentiful angle search and nonlinear optimization are avoided. Thus, the method has the advantages of being high in measurement precision, low in data processing complexity and the like, and the performance and practical value of the system can be effectively improved when the method is applied to the large-scale MIMO scene.
Description
technical field [0001] The invention belongs to the technical field of wireless mobile communication, and in particular relates to a method for measuring the two-dimensional angle of arrival (Direction of Arrival, referred to as DOA) of an incoherent signal by using a large-scale antenna array. Background technique [0002] With the development of mobile communication technology, people's demand for communication services is increasing, and the requirements for communication speed and quality are getting higher and higher. The proposal of the fourth generation mobile communication system (4G) has greatly improved the spectrum utilization rate compared with the third generation mobile communication system (3G), specifically, the throughput of downlink 1Gbps and uplink 500Mbps has been achieved. The increase in spectrum utilization in 4G systems is mainly due to the adoption of multiple-input multiple-output (MIMO) antenna technology. MIMO technology can provide more degrees ...
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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 孟会鹏郑植杨雨轩刘柯宏葛琰杨娇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA