A Fast Method for Estimating the Direction of Arrival
A kind of wave arrival, fast technology, applied in the field of communication, can solve the problems of low resolution, low resolution of incident signal, low signal resolution, etc., to achieve the effect of small complexity and fast convergence speed
Inactive Publication Date: 2019-03-19
梁海浪 +1
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Problems solved by technology
[0005] The present invention mainly solves the technical problems existing in the prior art, such as low signal resolution for signals with small difference in incident angle, low resolution for incident signals with low signal-to-noise ratio, low resolution for incident signals, etc., and provides A fast calculation method of DOA applied to 60GHz wireless communication system, which can reduce the computational complexity of the beamforming algorithm and improve the resolution on the basis of improving the performance of wireless receivers and transmitters, thereby ensuring the quality of high-speed communication signals at the same time , greatly reducing the time-consuming DOA calculation
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Embodiment
[0054] Embodiment: a kind of DOA fast estimation method of this embodiment, such as figure 1 shown, including the following steps:
[0055] Signal preprocessing stage:
[0056] (1) Suppose there are K signals, among which the first Kc signals are correlated signals, and the remaining signals are independent signals and independent of the first Kc signals. Incident to such as figure 2 The uniform linear array shown is composed of M=2N+1 omnidirectional array elements with a spacing of d, and the array element 0 is used as a reference array element,
[0057] According to formula (2), the covariance matrix of the array output signal vector is estimated, namely
[0058]
[0059] in:
[0060] N is half of the total number of omnidirectional array elements, and the total number of omnidirectional array elements is 2N+1 (including 0 array elements as reference array elements);
[0061] x=[x(-N),...,x(0),...,x(N)] is the output signal vector of the array;
[0062] Is the c...
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The invention discloses a direction of arrival (DOA) fast estimation method and aims to solve the problems that on the condition that only a small difference exists among the incident angles of signals or the signal-to-noise ratio of incident signals is low, the signal resolution is low and the calculation complexity is large in the prior art. According to the method, firstly, a covariance matrix is constructed through the characteristic matrix transformation process. Based on the covariance matrix obtained through the feature decomposition process, a signal matrix and a noise matrix are constructed. After that, the vector iteration process is conducted based on the improved and optimized DOA algorithm, so that the calculation complexity is lowered. The calculation time for the DOA in a 60 GHz wireless communication system is greatly shortened. The technical scheme of the invention is applicable to 60 GHz wireless communication systems.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method for fast estimation of direction of arrival applied to a 60GHz wireless communication system. Background technique [0002] In recent years, the mobile communication industry has developed rapidly all over the world, and the requirements for bandwidth are getting higher and higher. 60GHz wireless communication technology will become the representative of the 4th generation wireless communication technology due to its ultra-high-speed data transmission capability, low cost, high anti-interference and security, international versatility and license-free characteristics. However, its biggest challenge is the high path loss. The path loss of the 6OGHz frequency band determines that it must use beamforming technology and fast estimation of the direction of arrival to improve link quality. Direction of Arrival (DOA) estimation, also known as Direction of Arrival estim...
Claims
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IPC IPC(8): H04B7/08
CPCH04B7/086
Inventor 梁海浪贺向阳周建荣
Owner 梁海浪