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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Problems solved by technology

[0007] For an OFDM mobile communication system, the data transmitted by the system is affected by the multip...

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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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