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Frequency offset estimation method under high-speed scene

A frequency offset estimation and scenario technology, applied in the field of frequency offset estimation in high-speed scenarios, can solve the problems of large difference and inaccurate frequency offset symbols, etc., and achieve the effect of large estimation range, high estimation accuracy and high practical value

Active Publication Date: 2018-06-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

If the judgment is wrong, the result may change by 2*pi, and the difference is huge. Time offset, noise, multipath, etc. will introduce other phases in the CP, making the frequency offset symbol judged by the CP inaccurate;
[0007] 2) It can only expand the frequency offset estimation range to twice the original

Method used

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  • Frequency offset estimation method under high-speed scene
  • Frequency offset estimation method under high-speed scene
  • Frequency offset estimation method under high-speed scene

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Embodiment Construction

[0049] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0050] Such as figure 1 As shown, the specific implementation steps of a frequency offset estimation method in a high-speed scenario are as follows:

[0051] Step 1: Receive signal from time domain Take out four OFDM symbols containing CRS reference signal in express. Such as figure 2 , the positions of the CRS in a resource block, l'=1, 2, 3, 4, respectively correspond to the OFDM symbols at the positions of l=1, 5, 8, and 12 in a subframe. n∈[1,N+N CP,l ] is the time index in one OFDM symbol, N is the number of FFT points, N CP,l is the CP length in one OFDM symbol. m is the receiving antenna index, m∈[1,N R ], N R is the number of receiving antennas. Take N=2048 in this method, N CP,l =144,N R =1.

[0052] Step 2: According to image 3 In the OFDM symbol structure diagram, the autocorrelation corr_cp of the received sign...

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Abstract

The invention relates to a frequency offset estimation method under a high-speed scene, and belongs to the field of the carrier frequency synchronization. The method comprises the following steps: computing frequency offset by using relativity between OFDM symbols located by a CRS in one sub-frame at first; and then performing frequency offset estimation by using CP-based frequency offset estimation algorithm; and finally modifying an estimation result of the frequency offset estimation algorithm based on CRS by using the estimation result of the CP-based frequency offset estimation result, thereby obtaining the final frequency offset. Under the condition of not additionally consuming frequency band resource and not performing symbol judgment, the estimation range of the frequency offset estimation algorithm based on a reference signal is enlarged to [-7.5KHZ, 7.5KHZ] from [-1KHZ, 1KHZ], so that the requirement of the high-speed scene is satisfied.

Description

technical field [0001] The invention belongs to the field of carrier frequency synchronization, relates to the field of wireless communication, and in particular to a frequency offset estimation method in a high-speed scene. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM), as a multi-carrier modulation technology, is widely used in the field of wireless communication technology due to its advantages of high spectrum resource utilization and strong anti-multipath fading capability. However, the OFDM system has obvious disadvantages, and it has strict requirements on the orthogonality between subcarriers. Carrier frequency offset will destroy the orthogonality between subcarriers, affect the correct demodulation at the receiving end, and thus affect the communication quality. [0003] Existing frequency offset estimation methods are mainly divided into non-data-assisted frequency offset estimation methods and data-assisted frequency offset esti...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2655H04L27/2657H04L2027/0026
Inventor 胡晓玲张治中王光亚李慧敏李琳潇黄汉仲
Owner CHONGQING UNIV OF POSTS & TELECOMM
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