Channel estimation method and system based on cyclic correlation

A channel estimation and channel technology, applied in baseband system components, multi-frequency code systems, etc., can solve problems such as training sequence and data symbol interference, achieve the effect of maintaining cycle characteristics, reducing complexity, and avoiding interference

Active Publication Date: 2012-03-14
TSINGHUA UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: how to avoid interference between training sequences and data symbols in traditional TDS-OFDM systems, thereby improving the accuracy of channel estimation and reducing system complexity

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  • Channel estimation method and system based on cyclic correlation
  • Channel estimation method and system based on cyclic correlation
  • Channel estimation method and system based on cyclic correlation

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Embodiment Construction

[0039] The method and system for channel estimation based on cyclic correlation proposed by the present invention are described in detail below with reference to the drawings and embodiments.

[0040] The channel estimation method and system based on cyclic correlation of the present invention adopts multi-segment continuous repeated block training sequences, which improves the accuracy of channel estimation and reduces the complexity of system implementation. At the same time, the existing advantages of the TDS-OFDM technology can be maintained.

[0041] Such as image 3 As shown, a channel estimation method based on circular correlation according to an embodiment of the present invention includes the following steps:

[0042]S1. After the received signal is frame-synchronized, the initial position information is obtained, and according to the initial position information, the corresponding received signal is selected as the receiving training sequence;

[0043] S2. Perform...

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Abstract

The invention relates to a channel estimation method and a channel estimation system based on cyclic correlation. The method comprises the following steps of: 1, performing frame synchronization on received signals to acquire initial position information, and selecting the corresponding received signals as a training receiving sequence according to the initial position information; 2, performing cyclic correlation operation on the training receiving sequence and a locally known training sequence to acquire a time domain channel impulse response; and 3, analyzing multipath distribution of a channel according to the time domain channel impulse response, if a selected position of the training receiving sequence is required to be adjusted, adjusting the selected position of the training sequence according to an analysis result, selecting the training receiving sequence again and returning to perform the step 2, otherwise, outputting a final channel estimation result. By the method and the system, interference between a training sequence and a data sign in the conventional time domain synchronous (TDS)-orthogonal frequency division multiplexing (OFDM) system can be avoided, the precision of channel estimation is improved and the system complexity is reduced.

Description

technical field [0001] The present invention relates to the technical field of digital signal transmission, in particular to a channel estimation method and system based on circular correlation. Background technique [0002] Orthogonal Frequency Division Multiplex (OFDM) technology has been applied in various broadband digital signal transmission systems due to its excellent ability to resist multipath interference, such as wireless local area network, wireless digital audio and Video broadcast transmission standard (Digital Television Terrestrial Broadcasting, DTTB). The OFDM technology is used in the European Digital Video Broadcasting-Terrestrial (DVB-T), the second generation DVB-T standard DVB-T2, and the Chinese terrestrial digital TV transmission standard (DigitalTelevision Multimedia Broadcast, DTMB). [0003] The traditional OFDM system uses a cyclic prefix (Cyclic-Prefix, CP) to combat inter-symbol interference (Inter-Symbol Interference, ISI) caused by multipath ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张超王昭诚王劲涛王军
Owner TSINGHUA UNIV
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