Channel estimation method in orthogonal frequency division multiple access system

Abstract

The invention provides a channel estimation method and a channel estimation device in an orthogonal frequency division multiple access system. The method mainly comprises the following steps: acquiring time-varying information of a frequency domain transmission function of each subcarrier in a sub-channel through linear interpolation processing according to an estimation value of a main diagonal element of a frequency domain transmission matrix of the sub-channel, wherein the sub-channel linearly changes in a time frequency interval of a pilot frequency; and converting the time-varying information of the frequency domain transmission function of each subcarrier in the sub-channel according to a predetermined conversion relation to obtain estimation values of all elements in the frequency domain transmission matrix of the sub-channel. The method and the device can effectively estimate disturbance among the sub-carriers according to time variation of a time-varying frequency domain response function of a tracking channel of a linear model within a symbol in a frequency domain so as to acquire a relatively accurate channel frequency domain transmission matrix.

Description

technical field The present invention relates to the technical field of wireless communication, in particular to a channel estimation method in an OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) system. Background technique In recent years, broadband wireless technology has developed rapidly. WiMAX (Worldwide Interoperability for Microwave Access), a broadband wireless access technology based on IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) 802.16 series standards, has gradually become the focus of the wireless communication industry. focus. Both the physical layers of IEEE802.16d and 802.16e adopt OFDMA technology. For an OFDM transmission system, the acquisition of CSI (Channel State Information, channel state information) plays a key role in data detection and equalization. Under the condition of high-speed terminal movement, the channel response function...

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Problems solved by technology

Embodiments of the present invention provide a channel estimation method and device in an OFDMA system to solve the problem that the application range of the channel estimation scheme in the prior art is limited

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