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Method and apparatus for estimating noise power

A noise power and estimated value technology, applied in the field of communication, can solve problems affecting the accuracy of noise power estimation, failure to eliminate multi-path inter-path interference, and affect receiver demodulation performance, etc., to eliminate inter-path interference and improve accuracy degree of effect

Inactive Publication Date: 2009-05-27
HUAWEI DEVICE CO LTD
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Problems solved by technology

[0005] In the case of dual-antenna transmission, the existing noise estimation scheme cannot eliminate the inter-path interference caused by the multi-path channel, thus affecting the accuracy of noise power estimation and further affecting the demodulation performance of the entire receiver

Method used

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  • Method and apparatus for estimating noise power

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Embodiment Construction

[0023] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0024] An embodiment of the present invention provides a method for estimating noise power, such as figure 1 shown, including the following steps:

[0025] Step s101, grouping the nth item and the n+4th item of the common pilot channel CPICH descrambling and despreading symbol on the strongest path in a time slot into a group;

[0026] Step s102, subtracting the nth item after grouping from the n+4th item;

[0027] Step s103, estimating the noise power according to the result of the above subtraction.

[0028] By adopting the method provided by the embodiment of the present invention, the nth item and the n+4th item of the CPICH descrambling and despreading symbols on the strongest path in a time slot are grouped into one group and subtracted in the group, so that the two In the case of antenna transmission, the inter-path interference in noise power estimat...

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Abstract

The embodiment of the invention discloses a method and a device for estimating noise power. The method comprises the following steps: dividing an nth item and an (n+4)th item of a common pilot channel CPICH descrambling-despreading signs on a strongest path in a time slot into a group; subtracting the grouped nth item and the (n+4)th item; and estimating the noise power according to a subtracted result. The embodiment of the invention utilizes the CPICH descrambling-despreading signs on the strongest path to be divided into groups and subtracted, can effectively eliminate span interference inestimation of the noise power under the condition of double-antenna transmission, and improve accuracy of the estimation of the noise power.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for estimating noise power. Background technique [0002] In the WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access) system receiver algorithm, no matter it is a RAKE receiver or an equalization receiver, it is necessary to estimate the noise power. In a RAKE receiver, noise power estimation will affect the calculation of LLR (Log-Likelihood Ratio, logarithmic likelihood ratio). In an equalized receiver, the estimation of noise power not only affects the calculation of LLR, but also affects the calculation of equalization coefficients. Therefore, the performance of noise power estimation directly affects the performance of the whole receiver. [0003] The existing noise power estimation scheme adopts CPICH channel descrambling and despreading, removes the first and last symbols in a time slot, and then forms a group of two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04W52/24H04B1/711
Inventor 张春玲花梦吴更石
Owner HUAWEI DEVICE CO LTD
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