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Frequency deviation estimating method and device

A technology of frequency offset estimation and frequency offset, which is applied in the field of frequency offset estimation, can solve the problems of increasing implementation complexity and cost, and achieve the effect of ensuring frequency offset estimation accuracy, large gain, and accurate frequency offset estimation value

Active Publication Date: 2015-04-01
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this improves the accuracy of frequency offset estimation to a certain extent, it greatly increases the complexity and cost of implementation

Method used

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  • Frequency deviation estimating method and device
  • Frequency deviation estimating method and device

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Embodiment Construction

[0019] In the embodiment of the present invention, frequency offset pre-compensation is performed on received data through historical frequency offset values; channel estimation and frequency offset estimation are performed on received data after user frequency offset pre-compensation to obtain the first estimated frequency offset value of the current subframe; using the current The first frequency offset estimation value of the subframe performs a second frequency offset compensation on the received data after the frequency offset precompensation. The frequency offset pre-compensation is performed on the received data through the historical frequency offset value, which reduces the range of frequency offset estimation. After the frequency offset pre-compensation, the channel estimation and the frequency offset estimation are performed again, and then the second frequency offset compensation is performed on the received data by using the obtained first frequency offset estimati...

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Abstract

The invention discloses a frequency deviation estimating method, which is used for simplifying steps of frequency deviation estimation, so that the precision of the frequency deviation estimation is improved. The frequency deviation estimating method comprises the following steps: carrying out frequency deviation pre-compensation on received data through a history frequency deviation value; carrying out channel estimation and the frequency deviation estimation on the received data which is subjected to the frequency deviation pre-compensation, so as to obtain a first frequency deviation estimation value of a current sub frame; and using the first frequency deviation estimation value of the current sub frame to carry out secondary frequency deviation compensation on the received data after the frequency deviation pre-compensation. The invention also discloses a device for realizing the method of the invention.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for frequency offset estimation. Background technique [0002] In a wireless communication system, for a multi-carrier system, the offset of the carrier frequency will cause interference between channels. In practical applications, in a more complex and time-varying wireless channel, there are situations such as the frequency deviation between the transmitter carrier and the receiver local oscillator or the Doppler frequency shift caused by fast movement, which will seriously It destroys the orthogonality between system subcarriers and causes interference. [0003] In the LTE (Long Term Evolution) system, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology is adopted. This is a multi-carrier transmission technology in which subcarriers are orthogonal to each other. It divides a carrier with a w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 魏继东李萍
Owner ZTE CORP
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