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SIR measuring device and SIR measuring method

A measuring device, a technology of interference wave, applied in the direction of noise figure or signal-to-noise ratio measurement, wireless communication, communication between multiple stations, etc., can solve the problems of interference power measurement accuracy deterioration, measurement accuracy deterioration, interference power measurement, etc.

Inactive Publication Date: 2002-07-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] That is, if the average number of slots is too small, sufficient averaging cannot be performed, so the accuracy of interference power measurement deteriorates, and the accuracy of SIR measurement deteriorates.
On the contrary, if the average number of time slots is too large, the interference power cannot be accurately measured for burst interference, and the accuracy of SIR measurement will deteriorate.

Method used

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  • SIR measuring device and SIR measuring method
  • SIR measuring device and SIR measuring method
  • SIR measuring device and SIR measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] figure 1 It is a block diagram showing the structure of the SIR measuring device according to the first embodiment of the present invention.

[0020] In this figure, the SIR measurement device of this embodiment includes: a desired wave power detection unit 10, an interference wave power detection unit 11, an average unit 12, an average unit 13, a difference unit 14, an interference fluctuation amount detection unit 15, and a selection unit 16 and the SIR calculation unit 17 .

[0021] The desired wave power detection unit 10 detects and outputs the power of the desired wave from the baseband reception signal for each predetermined processing unit (for example, one slot). The interference wave power detection unit 11 detects and outputs the power of the interference wave from the baseband reception signal for each predetermined processing unit (for example, one slot).

[0022] Such as figure 2 As shown in the block diagram, the desired wave power detection unit 10 a...

Embodiment 2

[0049] Figure 4 It is a block diagram showing the structure of the SIR measuring device according to the second embodiment of the present invention. In this figure, for the previous example 1 figure 1 The same part is appended with figure 1 same label. The difference between this embodiment and Embodiment 1 lies in that: the variation of the interference wave power is detected by taking the difference of the interference wave power successively in time.

[0050] In this figure, in addition to the desired wave power detection unit 10, the interference wave power detection unit 11, and the SIR calculation unit 17, the SIR measurement device of Embodiment 2 also includes: an average unit 22, the average interval is variable, and the interference wave power The output of detection section 11 is averaged; Delay section 18 delays the output of interference wave power detection section 11; Difference; Interference variation detection part 20, detects the variation of interferenc...

Embodiment 3

[0055] Figure 5 It is a block diagram showing the structure of the SIR measurement device according to the third embodiment of the present invention. In this figure, for the previous example 1 figure 1 The same parts are assigned the same reference numerals, and descriptions thereof are omitted. The difference between this embodiment and Embodiment 1 lies in that the fluctuation amount of the interference wave power is detected by calculating the variance of the interference wave power.

[0056] In the SIR measurement device of Embodiment 3, the delay unit 18, the subtractor 19, and the interference variation detection unit 20 of the SIR measurement device of the above-mentioned Embodiment 2 are replaced by: a variance calculator 23, which is calculated based on the output of the interference wave power detection unit 11. variance; and the interference fluctuation amount detection unit 24 detects the magnitude of the interference wave power fluctuation amount based on the v...

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Abstract

A desired signal power detection unit (10) detects a desired signal power from a reception signal, while an interference signal power detection unit (11) detects an interference signal power from the reception signal. Interference signal powers sequenced in time are averaged over a long section at an averaging unit (12), and averaged over a short section at an averaging unit (13). A differential unit (14) determines the difference between an average over a long section and an average over a short section. A selection unit (16) selects the average over the short section when the obtained difference is larger than a preset threshold, and the average over the long section when it is smaller. An SIR calculation unit (17) determines a ratio between the average selected at the selection unit (16) and the desired signal power detected at the desired signal power detection unit (10).

Description

technical field [0001] The present invention relates to a SIR (Signal to Interference Ratio, Signal to Interference Ratio) measurement device and a SIR measurement method in CDMA (Code Division Multiple Access) mobile communication. Background technique [0002] Conventionally, in CDMA-based mobile communications, transmission power control is performed. The transmission power control is to calculate the SIR (ratio of desired signal to interference signal power) at the receiving station side, and control the transmission power at the sending station side so that the power value remains constant during reception. [0003] As an SIR measuring device, as disclosed in Japanese Patent Application Laid-Open No. 10-13364, for example, a method of obtaining desired wave power and interference wave power using a known pilot signal transmitted from a transmitting end is being studied. In this method, the received desired wave power and received interference wave ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/26H04B7/26H04B17/00H04B17/336H04W24/00H04W88/02H04W88/08
CPCH04B17/336H04B17/006H04B1/7097H04B7/155
Inventor 三好宪一平松胜彦
Owner PANASONIC CORP