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Method and device for maximum likelihood frequency offset estimation based on joint pilot frequency

A technology of frequency offset estimation and maximum likelihood, applied in the field of mobile communication, can solve the problem of low performance of offset frequency estimation

Inactive Publication Date: 2014-06-18
ZTE CORP
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Problems solved by technology

[0006] The present invention provides a maximum likelihood frequency offset estimation method and device based on joint pilots to solve the problem of low offset frequency estimation performance in the prior art

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  • Method and device for maximum likelihood frequency offset estimation based on joint pilot frequency
  • Method and device for maximum likelihood frequency offset estimation based on joint pilot frequency
  • Method and device for maximum likelihood frequency offset estimation based on joint pilot frequency

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Embodiment Construction

[0068] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0069] Existing research on frequency synchronization algorithms under MIMO-OFDM conditions rarely studies effective means and methods to improve frequency offset estimation from the perspective of effective use of pilot symbols. In order to solve the problem of low performance of offset frequency estimation in the prior art , the present invention provides a maximum likelihood frequency offset estimation method and device based on ...

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Abstract

The invention discloses a method and a device for maximum likelihood frequency offset estimation based on a joint pilot frequency. The method and the device are used for reception synchronization of a multi-input multi-output (MIMO)-orthogonal frequency division multiplexing (OFDM) system. The method comprises the following steps: a receiving end preprocesses a corresponding nth transmission pilot symbol matrix D(n), a discrete Fourier transform (DFT) matrix F, and a matrix W(wavy line) composed of the first L columns of the matrix F to obtain a matrix P(n); the receiving end respectively and correspondingly stores a receiving pilot symbol matrix R(n) and the matrix P(n) in first-in-first-out sliding window memories with the length being M; and M frequency offset matrixes are constructed, the receiving pilot symbol matrix R(n) and the matrix P(n) are acquired from the sliding window memories, a likelihood function is calculated according to the receiving pilot symbol matrix R(n), the matrix P(n) and the M frequency offset matrixes, and frequency offset estimation values to be selected are substituted in the likelihood function to obtain a frequency offset estimation value, which makes the accumulation of values of the likelihood function minimum, as the final maximum likelihood frequency offset estimation value.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a maximum likelihood frequency offset estimation method and device based on joint pilots. Background technique [0002] For any digital communication system, synchronization is a prerequisite and an important guarantee for reliable data transmission. The quality of synchronization performance will directly affect the performance of the entire communication system. However, in a wireless communication system, due to the frequency difference between the sending end device and the receiving end device, and the Doppler frequency shift caused by the movement of the user end device, there is a frequency gap between the carrier frequency and the frequency of the local crystal oscillator. Partial. In order to ensure the reliable transmission of data, the frequency offset of the signal must be accurately estimated and compensated. [0003] In addition, the downlink of the Long Term ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 江海李斌陈庆春乔静何志谦王宏宇丁远晴
Owner ZTE CORP
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