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Signal-to-noise ratio measuring method and device

A signal-to-noise ratio and signal technology, applied in noise figure or signal-to-noise ratio measurement, transmission monitoring, electrical components, etc., can solve problems such as difficulty in reflecting channel quality, large SNR error, and difficulty in reflecting various signal analysis situations.

Inactive Publication Date: 2009-08-05
CHINA ACAD OF TELECOMM TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, in actual situations, a limited number of β factors is difficult to reflect various signal analysis situations. Therefore, in practice, the signal-to-noise ratio of the user signal output from the receiver calculated using the β factor usually has a large error, and it is difficult to reflect the real channel quality.

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  • Signal-to-noise ratio measuring method and device
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  • Signal-to-noise ratio measuring method and device

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Embodiment Construction

[0053] In order to make the technical solutions and advantages of the present invention clearer, further detailed description will be given below in conjunction with the accompanying drawings.

[0054] In code division multiple access communication systems such as TD-SCDMA, the data transmitted through the channel is usually subjected to spread spectrum processing. The so-called spread spectrum processing is mainly to ensure the security of data transmission. At the sending end, the spreading code assigned by the system to the user is used to scramble the actual data, so that the representation of the actual data is changed; the receiver at the receiving end adopts the same The spread spectrum code despreads the received data signal to analyze the actual data. And, in general, the actual data that is transmitted may be referred to as symbols. Therefore, in the present invention, the signal based on the actual processing of the receiver is a signal with a spread spectrum proce...

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Abstract

The embodiment of the invention provides a signal-to-noise ratio measuring method, which comprises the following steps: a combined channel response value of a corresponding channel is computed according to a pre-obtained channel estimated value and corresponding spreading code information; and the signal-to-noise ratio of an output signal of a receiver is computed according to a system matrix that is built by utilizing the combined channel response value and a signal noise estimated value. The invention further provides a signal-to-noise ratio measuring device. The technical proposal that is provided by the invention can lead the computed signal-to-noise ratio result of the output signal of the receiver to approximate real situations.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a signal-to-noise ratio (SNR) measurement method and device. Background technique [0002] In a mobile communication system, in order to ensure the timeliness and accuracy of data transmission as much as possible, it is usually necessary to measure the channel quality used for data transmission. Channel quality can be measured by measuring the SNR of the signal. SNR refers to the ratio between the effective signal and the noise signal. The higher the SNR, the better the channel quality. Conversely, the lower the SNR, the worse the channel quality. [0003] In code division multiple access systems such as time division synchronous code division multiple access (TD-SCDMA), when measuring SNR, for example, within a period of time, after the receiver receives the signal from the user side, it needs to analyze and process many signals. to distinguish signals from differ...

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Application Information

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IPC IPC(8): H04B17/00G01R29/26H04B17/336
Inventor 何剑张杰
Owner CHINA ACAD OF TELECOMM TECH