Channel Estimation Method and Channel Estimator Based on Complex Exponential Base Extension Model

A technique of complex exponential base expansion and channel estimation, which is applied in the field of channel estimation and channel estimator based on complex exponential base expansion model, can solve the problems affecting the accuracy of channel estimation and the large error of CE-BEM model, etc., to reduce errors, The effect of low complexity and improved accuracy

Active Publication Date: 2015-11-11
SHANGHAI MODERN ADVANCED ULTRA PRECISION MFG CENT
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Problems solved by technology

Especially in the case of low pilot frequency, only low-order CE-BEM can be used. At this time, the error of CE-BEM model is large, which seriously affects the accuracy of channel estimation.

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  • Channel Estimation Method and Channel Estimator Based on Complex Exponential Base Extension Model
  • Channel Estimation Method and Channel Estimator Based on Complex Exponential Base Extension Model
  • Channel Estimation Method and Channel Estimator Based on Complex Exponential Base Extension Model

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Embodiment Construction

[0073] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0074] In this embodiment, an example of a block transmission system with a cyclic suffix (ZP) is used to describe the channel estimation method of the present invention. The channel estimation method used in this example can also be used in transmission systems other than non-ZP systems. In this example, the ZP system adopts the pilot channel estimation method, that is, inserts pilot blocks at equal intervals in the transmitted data, and each pilot sub-block is the same, with a length of 2L+1, and the beginning and end of the pilot sub-block are composed of It consists of 0 values ​​with a length of L, and the middle part is a constant value with a length of 1. Without loss of generality, set this constant value to 1. The pilot structure of the actual system may be differe...

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Abstract

The invention discloses a channel estimation method based on a complex exponential-basis expansion model. The method comprises the following steps of: (1) estimating gradient of channel impulse response in intervals according to the data processed by a wireless receiver; (2) based on the CE-BEM (Complex Exponential-Basis Expansion Model), calculating baseline compensation quantity of an observed value, and a new signal model; (3) estimating the channel impulse response after compensation; and (4) calculating the channel impulse response before compensation. The invention further discloses a channel estimator. With the method and the estimator provided by the invention, the error of the CE-BEM is reduced, the accuracy of channel estimation is improved, and the implementation complexity is low.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a channel estimation method and a channel estimator based on a complex exponential base expansion model. Background technique [0002] In the broadband wireless communication system, the wireless signal experiences frequency dispersion and time domain dispersion, and the amplitude, phase and frequency of the signal will be distorted, especially when the two communication objects move at a relatively fast speed, due to the Doppler Due to the Le effect, the signal of the wireless channel has experienced severe fast fading, forming a fast-changing channel. They seriously affect the quality of communication. Therefore, it is very necessary to dynamically estimate the channel before demodulating and decoding the signal at the receiving end of the signal. Channel estimation technology is a technology for estimating the impulse response of a wireless channel. [0003] ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
Inventor 杨小平顾亚平张俊
Owner SHANGHAI MODERN ADVANCED ULTRA PRECISION MFG CENT
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