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Method of Wiener-Kolmogorov model interpolation based on time domain signal-to-noise ratio

A technology of signal-to-noise ratio estimation and interpolation method, which is applied in the field of broadcasting systems, can solve problems such as increasing receiver implementation complexity and affecting receiver performance, and achieves the effect of avoiding matrix inversion operation and simplifying implementation complexity

Inactive Publication Date: 2008-06-18
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

[0016] Although the Wiener interpolator is the best interpolator under the minimum mean square error criterion, it still has the following deficiencies: the statistical characteristics of the transmission channel, the accuracy of the estimation of the signal-to-noise ratio, and the Wiener interpolator used for interpolation The number of taps will affect the performance of the receiver; secondly, due to the real-time update of the tap coefficients of the interpolator, it is necessary to use a matrix inversion operation with a considerable amount of calculation, which will also greatly increase the complexity of the receiver implementation

Method used

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  • Method of Wiener-Kolmogorov model interpolation based on time domain signal-to-noise ratio
  • Method of Wiener-Kolmogorov model interpolation based on time domain signal-to-noise ratio
  • Method of Wiener-Kolmogorov model interpolation based on time domain signal-to-noise ratio

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Embodiment

[0068] The actual DRM broadcast channel is a double-fading channel with both frequency selectivity caused by multipath and time selectivity caused by Doppler spread or frequency shift. Among them, the multipath propagation is mainly caused by the reflection of the ionosphere at different heights. The maximum delay spread of the channel can reach several milliseconds. The Doppler spread and frequency shift are mainly caused by the spectral characteristics of the ionospheric reflection and the movement of the receiver. . Taking mid-latitude regions as an example, the maximum delay spread can reach 6ms, and the Doppler spread can reach 5Hz. Typically, the typical values ​​of delay spread and Doppler spread are 2ms and 1Hz, which are the parameter values ​​of channel model 4 we use.

[0069] In line with the principle of proceeding from reality, we investigated the situation of channel model 3 and channel model 4 in the DRM specification, in which channel model 3 is the USConsort...

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Abstract

A wiener interpolation method based on time domain SNR estimation includes the steps of acquiring a channel frequency response of a pilot subcarrier; utilizing two cascade interpolation filters to acquire the channel frequency response of a data subcarrier; utilizing a stored interpolation result to carry through frequency domain equalization of single tap on the data received on the data subcarrier. The performance of the wiener interpolation method estimated by the real time flatness SNR of the invention is very close to the performance under a situation estimated by an ideal SNR and is extremely better than the system of the method by adopting line interpolation. Furthermore, by adopting a method for storing the parameters of an interpolation filter in advance, the matrix inversion with large calculating amount can be avoided, thereby greatly simplifying the realizing complexity of a receiver.

Description

technical field [0001] The present invention relates to a broadcasting system, in particular to a Wiener interpolation method based on time-domain signal-to-noise ratio estimation. Background technique [0002] DRM is the only universal non-proprietary digital radio broadcasting system for the shortwave, mediumwave and longwave AM broadcasting bands. Under the same coverage conditions, the power of the DRM transmitter is 6-9dB lower than that of the traditional analog transmitter, and the same-adjacent frequency protection rate of digital broadcasting is lower than that of analog broadcasting. It has strong anti-multipath interference ability and is convenient for mobile reception; the sound quality can Reach the quality of CD or FM stereo; can provide additional data and multimedia information; compared with DAB, its receiver price is easier to be accepted by the audience. Its appearance is a sign of the revival of broadcasting in the frequency band below 30MHz, and it has...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 潘立军魏立军
Owner BEIJING SAMSUNG TELECOM R&D CENT
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