Method and measurement configuration for measuring the characteristics of radio channels
First Claim
1. A method for measuring characteristics of radio channels, which comprises:
- transmitting a transmission signal containing a preselected test sequence;
receiving received signals with a plurality of receiving sensors in a two-dimensional antenna array, the respective received signals being composed of wave elements of the transmission signal with regard to an azimuth φ
k and an elevation θ
k of different incidence direction and different delay;
demodulating and subsequently sampling the received signals;
calculating eigenvalues corresponding to dominant eigenvalues with samples obtained in the sampling step, and deriving a signal subspace matrix from the calculated eigen vectors;
establishing invariance equations dependent on the signal subspace matrix; and
simultaneously determining estimated values for the incidence direction and delays of dominant wave fronts by solving the invariance equations.
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Abstract
The characteristics of radio channels are measured. The signals received by a plurality Mc of receiving sensors of a two-dimensional antenna array are composed of wave elements of a transmission signal with regard to the azimuth and the elevation of a different two-dimensional incidence direction and different delay. The transmission signal contains a preselected test sequence, and the incidence angle as well as the delay of the dominant wave fronts are estimated simultaneously taking account of the chip signal form of the test sequence. The signals of each antenna sensor are demodulated, and sampling is then carried out with Mc samples per chip in the test sequence. The resultant samples are transformed to the frequency domain by discrete Fourier transformation, and the resultant values are corrected taking account of the spectrum of the chip signal form, wherein the line vectors formed from the values obtained for each sensor can be combined to form a data matrix XF, which contains invariances that characterize the channel in the space/frequency domain.
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Citations
19 Claims
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1. A method for measuring characteristics of radio channels, which comprises:
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transmitting a transmission signal containing a preselected test sequence;
receiving received signals with a plurality of receiving sensors in a two-dimensional antenna array, the respective received signals being composed of wave elements of the transmission signal with regard to an azimuth φ
k and an elevation θ
k of different incidence direction and different delay;
demodulating and subsequently sampling the received signals;
calculating eigenvalues corresponding to dominant eigenvalues with samples obtained in the sampling step, and deriving a signal subspace matrix from the calculated eigen vectors;
establishing invariance equations dependent on the signal subspace matrix; and
simultaneously determining estimated values for the incidence direction and delays of dominant wave fronts by solving the invariance equations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
a linear antenna array;
a plurality of receiving sensors;
an analog/digital sampling device connected to an output of one of said receiving sensors;
a matched filter connected to said sampling device;
a device for discrete Fourier transformation; and
at least one signal processor configured to perform the method according to claim 1.
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Specification