A time change channel estimating method for OFDM system

A technology of time-varying channel and channel, which is applied in the field of channel estimation of OFDM system, and can solve problems such as noise
CN101166171AInactive Publication Date: 2008-04-23UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
UNIV OF ELECTRONIC SCI & TECH OF CHINA
Publication Date
2008-04-23
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

When normalized Doppler shift is less than 0.2, the method uses characteristic of linear variation of time varying channel to carry out iterative noise cancellation for taps needed to estimate in order to restrain influence on channel estimation from noise so as to obtain tap coefficient of channel as well as transition matrix of channel. The receiving end carries out iterative channel estimation for first symbol of each frame and removing noise influence so as to obtain locations of channel taps. Subsequent symbol estimates tap coefficients of channel for assured locations without need of iteration. The method can remove influence on time varying channel estimation caused by noise, raises accuracy for estimating channel and spectrum utilization ratio. Moreover, the invention possesses features of low complexity of integral calculation.
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Description

technical field

[0001] The invention belongs to the field of wireless communication, and particularly relates to a channel estimation method of an OFDM system. Background technique

[0002] Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) technology has been paid more and more attention due to its advantages of high data transmission rate, strong anti-multipath interference capability, and high spectrum efficiency. It has been successfully used for wired and wireless communications. Such as: DAB (Digital Audio Broadcasting), DVB, IEEE802.11a and HyperLAN / 2. OFDM, a new modulation technology, can also be used in a new generation of mobile communication systems. OFDM technology will greatly improve the transmission data rate and spectrum efficiency of the new generation mobile communication system, and has a good anti-multipath ability, see the literature: Bingham, J.A.C., "Multicarrier modulation for data transmission: an idea wh...

Claims

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