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An array direction finding method and device for broadband OFDM communication signals

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 estimate the direction of arrival, and inability to distinguish multiple signals, and achieve the effect of excellent super-resolution direction finding performance.

Active Publication Date: 2021-04-20
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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  • An array direction finding method and device for broadband OFDM communication signals
  • An array direction finding method and device for broadband OFDM communication signals
  • An array direction finding method and device for broadband OFDM communication signals

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specific Embodiment 1

[0105] 5.1 Simulation conditions:

[0106] 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.

[0107] Antenna array form 1: 8 omnidirectional antenna array elements form a uniform linear array, and the array element spacing c is t...

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Abstract

The invention relates to direction finding technology in the field of broadband array signal processing. The invention selects a focus reference frequency point, decomposes the OFDM signal received by the array and performs DFT processing to obtain a broadband array signal; and then uses the focused array flow pattern and reference frequency The constraints of the minimum error between point array flow patterns and the array flow pattern matrix are used to calculate the focus matrix of each corresponding frequency point; according to the focus matrix, the data received by the array in each sub-time period is focused and transformed to obtain a single frequency point data covariance matrix, Then obtain the covariance matrix of the reference frequency point; calculate the arithmetic mean R of the covariance matrix of each reference frequency point; decompose the eigenvalue of R to obtain the signal subspace and noise subspace, and then obtain the spatial spectrum expression of the wideband MUSIC algorithm Formula; search according to the spatial spectrum expression, and obtain the angular positions corresponding to the P maximum points, which is the estimated value of the direction of arrival of the broadband OFDM signal.

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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Patent Type & Authority Patents(China)
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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