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Frequency domain channel estimation method of asynchronous multicarrier system

A multi-carrier system and frequency-domain channel technology, which is applied in the field of frequency-domain channel estimation of asynchronous multi-carrier systems, can solve problems such as the lack of pilot frequency design and channel estimation methods, and achieve the effect of reducing the complexity of channel estimation and improving the estimation accuracy.

Inactive Publication Date: 2017-09-15
SOUTHEAST UNIV
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Problems solved by technology

[0004] For wideband asynchronous adjustable multi-carrier systems, there is no practical pilot design and channel estimation method

Method used

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  • Frequency domain channel estimation method of asynchronous multicarrier system
  • Frequency domain channel estimation method of asynchronous multicarrier system
  • Frequency domain channel estimation method of asynchronous multicarrier system

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Embodiment Construction

[0025] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0026] This specific embodiment discloses a frequency-domain channel estimation method for an asynchronous multi-carrier system, including the following steps:

[0027] S1: Each sub-channel at the sending end mixes the time-domain pilot sequence and data sequence into a frame, and the framed signal is synthesized by a segmented fast convolution multi-carrier synthesis filter bank. The pilots of different sub-channels The sequence only occupies the frequency band occupied by the corresponding subchannel; a zero guard interval can be inserted between the pilot sequence and the data sequence to obtain better channel estimation performance;

[0028] S2: The receiving end extracts the received time-domain pilot sequence according to the pilot insertion scheme of the sub-channel, and obtains the time-domain tap coefficient ...

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Abstract

The invention discloses a frequency domain channel estimation method of an asynchronous multicarrier system. The frequency domain channel estimation method of the asynchronous multicarrier system comprises the steps of S1, mixing a time domain pilot frequency sequence and a data sequence into a frame by each sub-channel of a sending terminal, and carrying out multicarrier signal synthesis for the framed signals through a piecewise rapid convolution multi-carrier synthetic filter set, wherein the pilot frequency sequences of different sub-channels only occupy the frequency bands occupied by the corresponding sub-channels; S2, extracting and receiving time domain pilot frequency sequences based on a pilot frequency insertion scheme of the sub-channels by a receiving terminal, and obtaining time domain tap coefficients of the sub-channels through channel estimation; S3, after carrying out time domain de-noising processing for the estimated time domain tap coefficients, zero-filling at the tails and transforming the coefficients to a DFT domain to obtain a frequency domain channel estimation value in each sub-channel at the current moment; and S4, performing interpolation on the frequency domain channels estimated by different pilot frequency sequences on the time dimension to obtain frequency domain channel information of the data sequence position for frequency domain balancing. The frequency domain channel estimation method of the asynchronous multicarrier system greatly improves the estimation precision and reduces the channel estimation complexity in the presence of the minimum mean square error criterion.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel estimation method in the frequency domain of an asynchronous multi-carrier system. Background technique [0002] In order to meet the needs of communication development, the next-generation wireless communication system must have higher spectrum utilization and energy efficiency on the basis of increasing data transmission speed, and its wireless coverage performance, transmission delay and user experience have been significantly improved. The system supports the communication requirements of different businesses, especially massive sensing devices and machine-to-machine (M2M) communication. The system also needs to have sufficient flexibility to integrate and dynamically allocate spectrum resources. [0003] The new generation of multi-carrier parallel transmission technology is the key to the development of the next generation of wireless commu...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03H04L27/26
CPCH04L25/0256H04L25/0224H04L25/03159H04L27/2628H04L27/265
Inventor 王闻今赵锦程张连炜李怡宁李灵瑄石丁洪姝高西奇
Owner SOUTHEAST UNIV
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