Channel estimation method and terminal

A channel estimation and channel technology, applied in baseband system components, multi-frequency code systems, etc., can solve the problem of channel estimation performance degradation, and achieve the effect of improving channel estimation performance

Inactive Publication Date: 2009-07-08
新奇点智能科技集团有限公司
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Problems solved by technology

Aliasing phenomenon will lead to channel estimation performance degradation

Method used

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  • Channel estimation method and terminal
  • Channel estimation method and terminal
  • Channel estimation method and terminal

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0053] The main idea of ​​the present invention is to improve the frequency domain resolution of scattered pilots by performing interpolation in the time direction first, and then perform interpolation in the frequency direction so that no confusion will occur even under the condition of long delay extension. overlap phenomenon, thereby effectively improving the channel estimation performance of CMMB terminals.

[0054] image 3 It is a schematic flowchart of the channel estimation method of the present invention. see image 3 , the method is applicable to the CMMB terminal whose channel delay spread is greater than the CP condition, and the method comprises the following steps:

[0055] Step 301: Perform interpolation in the time direction on the in...

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Abstract

The invention discloses a channel estimation method, which suits a CMMB terminal under the condition that channel delay extension is larger than CP. The method comprises the following steps: firstly, subjecting inputted discrete pilot frequencies to interpolation in the time direction; and then subjecting the discrete pilot frequencies to interpolation in the frequency direction. The invention further discloses a CMMB terminal. The method can improve the frequency domain resolution of the discrete pilot frequencies, thereby preventing the occurrence of aliasing even under the condition of long delay extension and further effectively improving the channel estimation performance of the CMMB terminal.

Description

technical field [0001] The invention relates to China Mobile Multimedia Broadcasting (CMMB) system technology, in particular to a channel estimation method suitable for CMMB terminals under the condition of long time delay extension and a CMMB terminal. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in digital broadband broadcasting systems. Its advantages lie in its high transmission rate and its ability to resist strong frequency selective fading, that is, it can resist long channel delay spread. [0003] The CMMB system is a digital mobile multimedia broadcasting system based on OFDM technology. In order to improve coverage and save costs, the broadcasting system adopts single-frequency networking for networking. Therefore, the stronger the ability of the receiving terminal in the broadcasting system to work stably and reliably under the condition of long delay extension, the less The difficulty of single-frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张辉王西强徐彧周楚才杨利
Owner 新奇点智能科技集团有限公司
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