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Array direction-finding method and device thereof for aiming at broadband OFDM communication signal

A communication signal and broadband technology, applied in the field of direction finding, can solve the problems of inability to distinguish multiple signals of such signals, inability to distinguish and estimate multiple signals, etc., and achieve the effect of excellent super-resolution direction finding performance.

Active Publication Date: 2017-10-17
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology

[0003] For broadband OFDM communication signals, the traditional array direction finding MUSIC (MUltiple SIgnalClassification) algorithm cannot perform multi-signal resolution and direction-of-arrival estimation for such signals. The direction-finding algorithm of the system cannot distinguish multiple signals at the same time, let alone perform effective direction-of-arrival estimation

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  • Array direction-finding method and device thereof for aiming at broadband OFDM communication signal
  • Array direction-finding method and device thereof for aiming at broadband OFDM communication signal
  • Array direction-finding method and device thereof for aiming at broadband OFDM communication signal

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specific Embodiment 1

[0104] 5.1 Simulation conditions:

[0105] have the same center frequency f 0 =2GHz and the same bandwidth B=200MHz broadband OFDM communication signal, using QPSK (Quadrature Phase Shift Keying) modulation, 256 symbols, 64 subcarriers. Array noise n(t) is a stationary zero-mean band-limited (same bandwidth as OFDM signal) Gaussian process, and the noise n of M array elements m (t) (m=1, 2, . . . , M) are independent of each other and have the same statistical properties, and they are also statistically independent from the signal. The signal-to-noise ratio was set at 20dB. The sampling frequency of each array element is 4GHz. The performance simulation test is carried out for the following two array forms, the first line array is the commonly used array form at present, and the second circular array is a new formation adopted in this paper.

[0106] Antenna array form 1: 8 omnidirectional antenna array elements form a uniform linear array, and the array element spacing ...

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Abstract

The invention relates to the direction finding technology of the broadband array signal processing field. The array direction-finding method of the invention comprises steps of choosing a focusing reference frequency point, decomposing an OFDM signal received by an array and performing DFT processing to obtain a broadband array signal, using a constraint condition that an error between an array flow pattern after focusing and a reference frequency point array flow pattern and an array flow pattern matrix to calculate a focusing matrix corresponding to a frequency point, performing focusing conversion on array reception data in every sub-time-frame to obtain a single frequency point data covariance matrix according to the focusing matrix so as to obtain a covariance matrix relating to the reference frequency point, calculating a mathematic mean value R of each reference frequency point covariance matrix, performing characteristic value decomposing on the R to obtain a signal sub-space and a noise sub-space so as to obtain a space spectrum expression of a broadband MUSIC algorithm and performing searching according to a space spectrum expression to obtain an angle position corresponding to P maximum value points which is an estimation value of a direction of a broadband OFDM signal incoming wave.

Description

technical field [0001] The invention relates to a direction finding technology in the field of wideband array signal processing, in particular to an array direction finding method and device for wideband OFDM communication signals. Background technique [0002] The MUSIC (MUltiple SIgnal Classification) algorithm was proposed by Schmidt et al. in 1979. Its basic idea is to decompose the covariance matrix of any array output data to obtain the signal subspace corresponding to the signal component and the signal component Orthogonal noise subspaces, and then use the orthogonality of these two subspaces to search for spectral peaks to estimate the incident direction of the signal. [0003] For broadband OFDM communication signals, the traditional array direction finding MUSIC (MUltiple SIgnalClassification) algorithm cannot perform multi-signal resolution and direction-of-arrival estimation for such signals. The system's direction-finding algorithm can't distinguish multiple s...

Claims

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Application Information

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IPC IPC(8): G01S3/30G01S3/74H04L27/26
CPCG01S3/30G01S3/74H04L27/265
Inventor 武震臧维明蒋景飞
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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