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Direction of arrival estimation method

An angle of arrival and spectrum estimation technology, applied in the field of angle of arrival estimation, can solve the problems of reducing the number of estimable sources and low estimation accuracy, and achieve the effects of improving the DOA estimation performance, reducing the correlation, and increasing the amount of calculation.

Inactive Publication Date: 2009-05-13
ZTE CORP
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Problems solved by technology

Using this method of spatial smoothing for decorrelation reduces the number of array elements and array aperture, thereby reducing the number of estimable sources. For forward spatial smoothing and forward-backward spatial smoothing, the number of estimable sources is M / 2 and 2M / 3 (M is the number of base station array antennas), and the DOA estimation accuracy of related signal sources is also low

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Embodiment Construction

[0016] The basic idea of ​​the present invention is to perform conjugate rearrangement on the user's channel impulse response matrix, use the conjugate rearranged channel impulse response matrix to generate a modified spatial covariance matrix, and perform DOA based on the above-mentioned modified spatial covariance matrix estimate.

[0017] The spatial smoothing method is an effective method to reduce signal correlation. Its basic idea is to divide the equidistant linear array into several overlapping sub-arrays. The array manifolds of each sub-array are the same, and the covariance matrix of each sub-array Averaging can be performed to achieve decorrelation, which is the basic principle of forward smoothing. In addition to forward smoothing, forward and backward smoothing is performed on each sub-array to reconstruct a sub-array, and then the covariance matrix of each sub-array processed by forward and backward smoothing is averaged to form a total Covariance matrix, which ...

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Abstract

The invention discloses a method for direction of arrival estimation which is applied to a wireless communication system using a smart antenna, and is characterized in that after a channel impulse response matrix H of a user is obtained, conjugation rearrangement is carried out on the H or a complex conjugation matrix R* of a space covariance matrix R corresponding to the H to obtain a space covariance matrix R' which is in the conjugation rearrangement, and spectrum estimation is carried out on Rm equal to alpha mulitplies R' plus beta mulitplies R to obtain a direction of arrival angle estimated value. Compared with the existing DOA estimation method based on the space covariance matrix to estimate the spectrum, the DOA estimation method based on the space covariance matrix after the conjugation rearrangement to estimate the spectrum can efficiently enhance the accuracy of the DOA estimation, lowers the correlation among multipath signals of the user, and can improve the performance of carrying out the DOA estimation on the multipath signals of the desired user by utilizing high resolution algorithm in a system. Under the condition that the method does not reduce related multipath number which can be estimated, the calculation amount has no obvious increase.

Description

technical field [0001] The invention relates to a method for estimating an angle of arrival (Direction of Arrival, referred to as DOA). Background technique [0002] As the key technology in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, smart antenna has been researched more and more deeply in recent years. The space-time signal processing technology formed by the combination of smart antenna and traditional time-domain signal processing technology shows great potential in expanding cell range, improving system capacity, improving system spectrum utilization, reducing transmit power and reducing user interference. DOA estimation is the basis of smart antenna wireless technology positioning and channel allocation. [0003] For the DOA estimation method, the simplest implementation method is spectrum estimation, that is, the angular power spectrum of the spatial wave arrival signal is used in the form of an array, such as Bartlett (Ballett) spectr...

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Application Information

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IPC IPC(8): H04B7/04H04B1/707
Inventor 丁婷
Owner ZTE CORP
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