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DOA estimation method based on circular array of noise power

A noise power and circular array technology, applied in channel estimation, baseband system, baseband system components, etc., can solve the problem of high cost and achieve the effect of performance improvement

Inactive Publication Date: 2016-11-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

[0008] In order to overcome the defect of excessive overhead in ordinary DOA estimation, the present invention proposes a DOA estimation algorithm based on noise power estimation signal subspace

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  • DOA estimation method based on circular array of noise power
  • DOA estimation method based on circular array of noise power
  • DOA estimation method based on circular array of noise power

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] First, Rxx is obtained by autocorrelating the received signal, assuming that the target signal sources are statistically independent from each other, and the additive white Gaussian noise is the noise it receives. Then it can be concluded that the signal correlation matrix P can be expressed as P=E[s(n)s H (n)]=diag{P i}. Among them, P i is the average power of the i-th signal. Similarly, the correlation moment R of the received signal x(n) can be defined as: R=E[x(n)x H (n)] = APA H +σ 2 I.

[0033] Then, the first vector formed by the linear combination of the real signal subspaces is obtained for Assume that the sources are uncorrelated, and if When is the steering vector in the desired direction, the following formula can be obtained:

[0034] ,in, is formed by the linear combination of all preprocessed steering vectors, that is, t...

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Abstract

The invention belongs to the wireless communication technology field, especially relates to an algorithm of estimating a signal real sub-space by using noises in a wireless multiple input multiple output (MIMO) communication system. The invention provides a DOA estimation method based on a circular array of noise power. By using a white Gaussian noise invariability characteristic, a sub-space DOA estimation method is changed from a way of purely separating a signal sub-space from a noise sub-space into a way of providing the signal sub-space and the noise sub-space after a separation process by using the existence of the noises, and therefore performance is increased by 50% under a condition of a weak channel by using related theories of a matrix theory.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an algorithm for estimating a real subspace of a signal by using noise in a wireless multiple input multiple output (Multiple Input Multiple Output, MIMO) communication system. Background technique [0002] An important branch in the field of signal processing—array signal processing has a wide range of applications in biomedical engineering, civil communications, military electronic warfare, and many other fields. At present, array signal processing can be roughly divided into two main research directions: adaptive spatial filtering and spatial spectrum estimation. [0003] First of all, signal processing by array has a good application prospect in modern communication, and has been developed rapidly in recent years. As people continue to put forward higher standards for the capacity and quality of communication systems, ordinary communication antenna...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/08H04L25/02
CPCH04B7/0413H04B7/086H04L25/0204H04L25/024H04L25/0242
Inventor 李雪葳严峻岳光荣邹显炳宋志
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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