A channel estimate method and corresponding communication method and system

A technology for channel estimation and channel estimation, which is applied in channel estimation and the corresponding communication and system fields, and can solve problems such as restricting the development of information symbol resources.

Inactive Publication Date: 2008-04-30
PEKING UNIV
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Problems solved by technology

[0023] However, in the existing pilot-aided modulation OFDM system, the characteristic that the transmission rate of all subcarriers on each OFDM symbol is fixed limits the further development of information symbol resources

Method used

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  • A channel estimate method and corresponding communication method and system
  • A channel estimate method and corresponding communication method and system
  • A channel estimate method and corresponding communication method and system

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Embodiment Construction

[0114] The preferred embodiment of the present invention is described in more detail below with reference to the accompanying drawings of the present invention.

[0115] FIG. 1 is a schematic structural diagram of a communication system adopting the present invention. The communication system of the present invention will be described below with reference to FIG. 1 . The dotted box in the figure is divided into modules that the present invention needs to add to the existing pilot-aided modulation OFDM system, which is also the main difference between the present invention and the existing system.

[0116] The transmitter of the OFDM system in the preferred embodiment of the present invention includes the above-mentioned framing module, inserting pilot frequency module, transmitting information data grouping module, transmission rate limiting module and modulation module, and the receiver includes the above-mentioned receiving information symbol grouping module, iterative proces...

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Abstract

The invention provides the channel estimating method used for pilot frequency supplementary estimating system, the corresponding emitting method, the corresponding receiving method and the improved communication system structure. The invention sets the upper limit of information symbol transmitting speed of each group at the emitting end as the lower bound of mutual information between the input operation and the output operation, which the system can reach when the receiving end implements the relative detection for the information symbol of each group. Primarily, the receiving end utilizes the known pilot frequency symbol to implement channel estimation. The channel parameter which is obtained is implemented with initial estimation value. The initial estimation value is utilized to implement the relative detection for information symbol of the first group, and then the information symbol of the group, which is judged, is taken as equivalent pilot frequency symbol and estimates the channel again together with the known pilot frequency. The new channel parameter estimation value is utilized to implement the relative detection for the information symbol of the next group, which is received. The iteration is implemented and the channel is estimated. With the increase of equivalent pilot frequency energy, the estimation difference of the channel is reduced; therefore, the capacity performance of the system is improved.

Description

technical field [0001] The invention relates to a design scheme of a channel estimation system, a transmission and reception method required by the scheme, and an improved transmitter and receiver structure of a communication system. The present invention is applicable to a communication system in which channel state information is estimated with pilot assistance. Background technique [0002] How to improve frequency band utilization has always been a concern in the field of wireless communication research. In information theory, the research on this problem mainly focuses on the capacity performance of wireless communication systems. Research shows that the quality of channel estimation has great influence on the capacity performance of communication system; with the increase of channel estimation error, the capacity of communication system will decrease. In practical systems, channel estimation usually requires known pilot symbols to complete. Therefore, the research on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 焦秉立杨玉丽马猛
Owner PEKING UNIV
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