Synchronization and channel response estimation method suitable for OFDM system

A channel response and channel estimation technology, applied in the design of the system receiver, synchronization and channel response estimation fields, can solve the problems that affect the accuracy of channel response estimation, the system performance is not easy to guarantee, and the computational complexity is high, and the computational complexity is achieved. Equalizing, improving usability, reducing the effect of interference

CN101340416BInactive Publication Date: 2011-02-16BEIJING JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a synchronization and channel response estimation method which is applicable to an OFDM system, the technical proposal is as follows: a maximum likelihood criterion ML-based cost function for the symbol timing synchronization, the carrier frequency synchronization and the channel parameter joint estimation is proposed by using an OFDM system model under a frequency selective fading channel and against the requirements on the accuracy of the transmission of high-quality information of the next generation of wireless communication system and the existing OFDM wireless communication system. A system architecture and a strategy of timing offset Theta, carrier frequency offset Epsilon and channel impulse response h of joint estimation symbols are derived from the cost function. The method comprises the following steps of carrying out the coarse synchronization and the channel response estimation and carrying out the fine synchronization and the calculation of a channel estimated value. The method can realize the balance between the calculation precision and the calculation complexity, increase or reduce the times of the iteration of the fine synchronization according to the application of an actual system, reduce the interference during the wireless transmission, further improve the reliability of the system and improve the availability of the system.
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Description

technical field

[0001] The invention relates to the field of wireless communication, in particular to a synchronization and channel response estimation method suitable for OFDM systems, and the invention belongs to the design applicable to the receiver end of the system. In the continuous improvement of the next-generation wireless communication system, it provides a new method of symbol timing synchronization, carrier frequency synchronization and channel parameter joint estimation based on maximum likelihood criterion and reliable communication support for the existing OFDM wireless communication system. It has the characteristics of rapidity and accuracy. Background technique

[0002] With people's increasing demand for communication broadband, personalization and mobility, Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in various wireless communication fields. The OFDM system is very sensitive to synchronization errors. When there are ...

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Embodiment Construction

[0025] Aiming at the requirements of the next generation wireless communication system for the accuracy of transmission of high-quality information and the existing problems and challenges in the existing OFDM wireless communication system, an OFDM system model under the frequency selective fading channel is proposed based on the maximum likelihood criterion Cost function for joint estimation of symbol timing synchronization, carrier frequency synchronization and channel parameters for ML. Starting from the cost function, a system framework and strategy for jointly estimating symbol timing offset θ, carrier frequency offset ε and channel impulse response h are derived. It is characterized in that it includes the following steps: performing coarse synchronization and channel response estimation, and performing fine synchronization and channel estimation value calculation.

[0026] The specific content of performing coarse synchronization and channel response estimation includes...