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A channel estimation method applicable to multi-carrier system

A multi-carrier system and channel estimation technology, applied in the field of wireless communication, can solve the problems of high computational complexity and can not meet the needs of practical applications, and achieve the advantages of suppressing additive white Gaussian noise, improving channel estimation performance, and compensating for energy leakage. Effect

Inactive Publication Date: 2008-02-20
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the above method is that the calculation complexity is high, which cannot meet the needs of practical applications.

Method used

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  • A channel estimation method applicable to multi-carrier system
  • A channel estimation method applicable to multi-carrier system
  • A channel estimation method applicable to multi-carrier system

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Embodiment Construction

[0030] According to the present invention, a channel estimation method for a multi-carrier multi-antenna system is provided, including specific steps:

[0031] At the sending end, preferably, a pilot with a long number of available subcarriers is selected, and then subjected to inverse Fourier transform to obtain a time-domain pilot signal, and then different cyclic shift processing is performed on the time-domain pilot signal on each antenna; Finally, a cyclic prefix is ​​added to form a transmission frame with data symbols and sent out through the transmission antenna.

[0032] Preferably, constant amplitude-zero autocorrelation (CAZAC) sequences with different offset phases are used as pilots, and the maximum possible number of bits is selected for the number of cyclic shifts, that is, the ratio of the total number of system subcarriers to the number of transmitting antennas, and the cyclic shift is guaranteed The number of bits is greater than the maximum multipath delay. ...

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Abstract

The utility model discloses a channel estimation method for multi-carrier multi-antenna systems, which comprises the following steps: extracting the received signals of pilot frequency locations at the receiving end and conducting a preliminary estimate of the channel to attain the initial channel time domain impulse responses of each antenna; inputting the initial channel time domain impulse responses into the energy compensation module to select the effective path, and conduct energy compensation for each effective path and eliminate the impacts on the channel estimation of the energy spreading due to virtual carrier waves, so as to achieve a more accurate time domain impulse response; implementing the Fourier transformation to achieve the response estimate of channel frequency domain.

Description

technical field [0001] The invention relates to the field of wireless communication, especially the future mobile communication system of high-speed communication, and provides a high-performance channel estimation method suitable for multi-carrier systems, especially for multi-carrier multi-antenna systems. Background technique [0002] The future development trend of mobile communication services is high-quality multimedia services, and the throughput requirements of the cell will be increased to 100Mbps ~ 1Gbps. However, the spectrum resources available for future mobile communications are limited. In order to achieve high data rate information transmission on limited spectrum resources, a feasible way is to develop new air interface technologies with higher spectrum utilization. [0003] Multiple-Input Multiple-Output (MIMO) technology, also known as multi-antenna technology, can obtain high spectrum utilization and diversity gain. The combination of MIMO technology and...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B7/04
CPCY02D30/70
Inventor 张建华张平黄琛孙霏霏
Owner BEIJING UNIV OF POSTS & TELECOMM