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Carrier frequency synchronization method for UFMC system based on FPGA

A carrier frequency and frequency offset technology, which is applied in the field of FPGA-based UFMC system carrier frequency synchronization, and can solve the problems of CFO estimation method and so on.

Active Publication Date: 2018-09-04
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

But so far, few CFO estimation methods for UFMC systems have been proposed

Method used

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  • Carrier frequency synchronization method for UFMC system based on FPGA
  • Carrier frequency synchronization method for UFMC system based on FPGA
  • Carrier frequency synchronization method for UFMC system based on FPGA

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Embodiment Construction

[0071] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0072] The present invention provides a kind of UFMC system carrier frequency synchronization method based on FPGA, such as figure 1 As shown, a UFMC symbol is used as the training sequence, and the training sequence must contain m (m≥2) part of the same symbols; the entire frequency offset estimation process is completed through the fractional multiple frequency offset and integer multiple frequency offset; through the training sequence before and after The autocorrelation of two identical data parts obtains the fractional multiple frequency offset, and the training sequence estimate after the fractional multiple frequency offset compensation is multiplied by the local training sequence and FFT is performed to obtain the integer multiple frequency offset.

[0073] figure 2 is the block diagram of the UFMC system, such as figure 2 As sho...

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Abstract

The invention relates to a carrier frequency synchronization method for a UFMC system based on an FPGA, and belongs to the field of wireless communication. According to the method, a UFMC symbol is used as a training sequence, and the training sequence contains the same symbols of m parts, wherein m is not less than 2; the whole frequency offset estimation process is completed through a decimal frequency offset and an integer frequency offset; and the decimal frequency offset is obtained through self-correlation of the two same data parts before and after the training sequence, and training sequence estimation after decimal frequency offset compensation is multiplied by a local training sequence and FFT is made to obtain the integer frequency offset. According to the method, the estimationprecision can be guaranteed through the decimal frequency offset estimation, and the system requirements can be met; through the integer frequency offset estimation, the overall estimation range is greatly increased. A system frequency offset value is effectively estimated, a bit error rate of the system is reduced, and the communication quality is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to an FPGA-based UFMC system carrier frequency synchronization method. Background technique [0002] In order to meet the requirements of the next generation of mobile communications, new multi-carrier modulation schemes have received extensive attention. Filter Bank Multi-Carrier (FBMC) and Universal Filter Multi-Carrier (UFMC) based on filtering multi-carrier modulation are the current research hotspots. FBMC uses synthesis filter and analysis filter to realize carrier modulation and demodulation respectively. Because the sub-carriers are filtered, the filtering frequency band is narrow, and the impulse response length of the transmit filter is long, resulting in high overhead. In addition, the serious overlap of each sub-band in the FBMC system brings a large inter-carrier interference (ICI). The main method currently used for this problem is Offset Quadrature Amplitude Modu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/266H04L2027/0026
Inventor 余翔徐雷段思睿
Owner CHONGQING UNIV OF POSTS & TELECOMM
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