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Frequency deviation and phase deviation combination measurement method and apparatus thereof

A phase deviation and frequency deviation technology, which is applied in the field of mobile communication terminal testing, can solve the problems of high computational complexity, low frequency resolution, and low resolution, and achieve low computational complexity, high measurement accuracy, and high algorithm efficiency. Effect

Active Publication Date: 2012-03-21
TRANSCOM INSTR
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Problems solved by technology

In order to calculate N-point FFT, N*log2N additions and 0.5*N*log2N multiplications are required, so the computational complexity of this method is higher than that of the first one.
And the frequency resolution is generally 1Hz, and the resolution is low, so it is only suitable for frequency error measurement of high-speed broadband systems
[0009] The existing solution (1) can only solve the frequency error alone, and the initial phase error and the real-time phase error need to be calculated separately, and the algorithm efficiency is low
The existing solution (2) has higher computational complexity than the first one, and the frequency resolution is lower, generally 1Hz, so it is not suitable for frequency error measurement with higher precision requirements

Method used

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  • Frequency deviation and phase deviation combination measurement method and apparatus thereof
  • Frequency deviation and phase deviation combination measurement method and apparatus thereof
  • Frequency deviation and phase deviation combination measurement method and apparatus thereof

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Embodiment 1

[0038] See figure 1 , Is a schematic flow chart of the joint measurement of frequency deviation and phase deviation provided in the first embodiment of the present invention. As shown in the figure, the flow may include:

[0039] Step 101: The test equipment samples the transmitted signal of the tested mobile terminal.

[0040] Specifically, the test equipment and the mobile terminal under test use the training sequence code (TSC) for channel estimation to complete the high-speed (48-speed sampling in this embodiment) sampling signal synchronization to obtain the best synchronization position SYNC. SYNC includes not only the starting bit position information of the matched Active Part, but also the best matching sample point among the 48 sample points of a bit. Here, taking SYNC as the center, scan m sampling points on the left and right sides, a total of 2m+1 sampling points, each of which is the best sampling point, and 2m+1 sets of sampling multiples of length N are extracted a...

Embodiment 2

[0072] In order to further simplify the operation and improve the processing efficiency, further improvements are made on the basis of the first embodiment above, and the second embodiment is obtained. Specifically, the difference between the second embodiment and the first embodiment is:

[0073] In the least squares solution of the construction matrix equation in advance, the matrix Q formed by the first 2 column vectors of the Q matrix is ​​solved N×2 And the first 2 row vectors of the R matrix R 2×2 , The calculation matrix inv(R 2×2 ) And (Q N×2 ) H , And add the calculated matrix inv(R 2×2 ) And (Q N×2 ) H The value is stored. In this way, when testing, the pre-stored matrix inv(R 2×2 ) And (Q N×2 ) H According to the formula P 2×1 =inv(R 2×2 )×(Q N×2 ) H ×y N×1 Calculate the fitting factor vector P 2×1 .

[0074] The processing flow of the second embodiment can be as follows figure 2 As shown, I will not repeat them here.

[0075] The principle analysis is ...

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Abstract

The invention discloses a frequency deviation and phase deviation combination measurement method and an apparatus thereof. In the invention, during testing a mobile communication terminal, without regard to a condition of multi-user interference, the frequency deviation and phase deviation combination measurement method based on a matrix pretreatment mechanism is provided. The method is characterized by: using the structure matrix constructed previously to perform economical simplification QR decomposition; calculating least squares solution of a tropic of a sampling numerical curve so as to obtain the optimal solution of the frequency deviation and the phase deviation. By using the method and the apparatus of the invention, the combination measurement of the frequency deviation and the phase deviation can be realized. Compared to the prior art, an algorithm efficiency is higher and applicability is stronger.

Description

Technical field [0001] The present invention relates to mobile communication terminal testing technology in the field of communication technology, and in particular to a joint measurement method and device of frequency deviation and phase deviation. Background technique [0002] The radio frequency performance of mobile terminal equipment directly depends on the calibration of the radio frequency transceiver. Therefore, the testing and calibration of the radio frequency performance of mobile terminal equipment has become the most important link in the terminal production test. In the radio frequency performance calibration, AFC (Auto Frequency Control, automatic frequency control) calibration is a very important calibration link. AFC calibration is to adjust the crystal oscillator of the terminal so that the signal sent by the terminal has the correct carrier frequency. The calibration method is generally to control the terminal to transmit a signal on a series of frequencies t...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 张力张途
Owner TRANSCOM INSTR
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