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Method and device for estimating channel

A TD-SCDMA, channel estimation technology, applied in the field of third-generation mobile communications, can solve the problem of inability to adapt to mobile terminal channel estimation, etc., to achieve effective coverage, broad application prospects, economic value, and accurate channel estimation.

Inactive Publication Date: 2007-05-09
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0018] The purpose of the present invention is to provide a channel estimation method and device in TD-SCDMA, to solve the technical problem that the prior art cannot adapt to the channel estimation under the high-speed mobile state of the mobile terminal

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  • Method and device for estimating channel

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Embodiment Construction

[0046] The present invention provides a channel estimation method in TD-SCDMA, which first estimates the channel impulse response of the intermediate training sequence in the regular time slot of the subframe, and then, according to the distance between the data part in the regular time slot and the intermediate training sequence , to calculate the channel impulse response of the data part by interpolation.

[0047] Estimating the channel impulse response of the mid-training sequence can be achieved by:

[0048] As shown in Figure 3, it is the chip structure of each burst (Burst) in TD-SCDMA, wherein the purpose of the middle training sequence located in the middle of two data blocks is exactly to carry out channel estimation, two data blocks are 352chips, Midamble ( The middle training sequence) code length is 144chips, and the Midamble codes of different users are usually formed according to the cyclic shift of the basic Midamble (128chips) code.

[0049] In a synchronous C...

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Abstract

The method includes that: estimates the channel impact response of the mid training queue of the sub-frame normal slot; against the data section in the normal slot, according to the distance between the mentioned data section and the mentioned mid training queue, calculating via interpolation the channel impulse response of the mentioned data section. The invention avoids that treats directly the channel impulse response of the mid training queue is treated directly as the channel impulse response of the data section. This ensures a more accurate channel estimation of the data section and solves the technical problem that the channel estimation under hi-speed condition is difficult to realize via the existed technique. Therefore, the effective cover of the net against the hi-speed railway is realized.

Description

technical field [0001] The invention relates to the third generation mobile communication technology, in particular to a channel estimation method and estimation device in TD-SCDMA. Background technique [0002] The TD-SCDMA (Time Division Synchronous Code Division Multiple Access) standard is one of the important components of the 3G (Third Generation Mobile Communication System) standard. From the relevant test data, in TD-SCDMA, the mobile terminal of the prior art can When working well, its maximum moving speed is 120km / h, which is difficult to apply to high-speed railways. [0003] At present, quasi-high-speed railways with a speed of 160 kilometers per hour have appeared, and high-speed railways with a speed of 300 kilometers per hour to 500 kilometers per hour will be quickly built in the near future, and the coverage of high-speed railways is indispensable for the entire 3G coverage Partly, this is because: Generally, passengers on high-speed railways have at least ...

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Application Information

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IPC IPC(8): H04B1/707H04J13/02H04L25/02
Inventor 董霄剑
Owner ST ERICSSON SEMICON BEIJING
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