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Time-domain and frequency-domain combined channel estimating method

A joint channel estimation and frequency domain technology, applied in the field of communication, can solve problems affecting data accuracy and achieve the effect of improving performance

Inactive Publication Date: 2006-06-21
上海贝豪通讯电子有限公司
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AI Technical Summary

Problems solved by technology

[0007] For an OFDM mobile communication system, the data transmitted by the system is affected by the multipath fading effect of the channel, which affects the correctness of the system's decision data at the receiving end

Method used

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  • Time-domain and frequency-domain combined channel estimating method
  • Time-domain and frequency-domain combined channel estimating method
  • Time-domain and frequency-domain combined channel estimating method

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Embodiment Construction

[0029] The channel estimation method in the TD-SCDMA system compatible with OFDM technology proposed by the present invention is based on the characteristics of OFDM technology and TD-SCDMA system, combines the advantages of time domain estimation and frequency domain estimation, and adopts the method of time-frequency domain joint channel estimation Very suitable for TD-SCDMA system compatible with OFDM technology can greatly improve the reliability of the system.

[0030] The flow chart of the channel estimation method proposed by the present invention is as follows: figure 1 shown.

[0031] Add a certain number of pilots between OFDM symbols. The specific number of pilots is related to the changing characteristics of the channel; that is, when the channel changes quickly, more pilots are added, and when the channel changes slowly, the pilots are added less. . The pilot frequency can choose a sequence with relatively good orthogonality. Since OFDM transmission is used, it...

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Abstract

The invention relates to an estimation method for time and frequency domain joint channel, which comprises: adding some pilot frequency between OFDM symbols with quantity related with channel variation feature; using known 144chip in every conventional time slot of TD-SCDMA system as pilot frequency to insert into opposite carrier by one-dimension interpolation; on receiver end, obtaining need channel response on every symbol time and every sub-carrier according to two inserted pilot frequencies, taking weighted-mean to estimated results to obtain final need channel response. This invention can improves channel reliability in TD-SCDMA system effectively.

Description

【Technical field】 [0001] The present invention relates to the technical field of communication, in particular to a method for joint channel estimation of time domain and frequency domain in a TD-SCDMA system compatible with Orthogonal Frequency Division Multiplexing (OFDM) technology. 【Background technique】 [0002] The TD-SCDMA standard proposal was adopted by ITU as one of the four standards of the third generation mobile communication, which is a major breakthrough in China's mobile communication field. TDD-type standard proposals are easy to integrate into various advanced technologies, such as smart antenna technology, synchronous CDMA technology and software radio technology, etc. Therefore, TD-SCDMA technology has more advantages than other third-generation mobile communication standards . [0003] The TD-SCDMA system compatible with OFDM technology adopts OFDM technology in the transmission process. OFDM (Orthogonal Frequency Division Multiplexing) technology is a ...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 蔡凌云
Owner 上海贝豪通讯电子有限公司
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