Frequency offset estimation method and apparatus of long-term evolution system

A technology for frequency offset estimation and long-term evolution, which is applied in the field of frequency offset estimation of long-term evolution systems, and can solve the problems of small estimation range and low estimation accuracy.

Active Publication Date: 2017-07-11
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is the RS-based frequency offset estimation method, which has higher estimation accuracy but a smaller estimation range; the other is the CP-based frequency offset estimation method, which has a larger estimation range but lower estimation accuracy

Method used

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  • Frequency offset estimation method and apparatus of long-term evolution system
  • Frequency offset estimation method and apparatus of long-term evolution system
  • Frequency offset estimation method and apparatus of long-term evolution system

Examples

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no. 1 example

[0087] Figure 5 It is a flow chart of the first embodiment of the frequency offset estimation method of the LTE system of the present invention, as Figure 5 As shown, the process includes:

[0088] Step 500: Obtain two sets of complex symbol data demodulated from two different OFDM symbols on any antenna port of the signal transmitting end.

[0089] Here, two sets of complex symbol data demodulated on the pth antenna port of the signal transmitting end according to two different OFDM symbols can be obtained; the signal transmitting end can be the radio frequency signal transmitting end of the mobile terminal, p is a natural number, and p is taken as 1 to P, where P represents the total number of antenna ports at the signal transmitting end.

[0090] Here, the two different OFDM symbols are the i-th OFDM symbol and the j-th OFDM symbol, i is not equal to j; the two sets of complex symbol data obtained are respectively on the p-th antenna port of the signal transmitting end ...

no. 2 example

[0160]In order to better reflect the purpose of the present invention, further supplementary descriptions are made on the basis of the first embodiment of the present invention.

[0161] Figure 9 It is a flow chart of the second embodiment of the frequency offset estimation method of the LTE system of the present invention, as Figure 9 As shown, the process includes:

[0162] Steps 900-901: are exactly the same as steps 500-501, and will not be repeated here.

[0163] Step 902: When the preset clustering parameter K is equal to 1, evenly divide a plurality of grids on the complex plane, and each grid has the same size.

[0164] Here, the shape of each grid is not limited, for example, the shape of each grid may be triangle, square, rectangle, sector and so on.

[0165] Specifically, dividing a plurality of grids evenly on the complex plane includes: recording the quadrant of the complex plane where each complex number in the two sets of updated complex symbol data is loca...

no. 3 example

[0223] In order to better reflect the purpose of the present invention, further supplementary descriptions are made on the basis of the first embodiment of the present invention.

[0224] Figure 12 It is a flow chart of the third embodiment of the frequency offset estimation method of the LTE system of the present invention, as Figure 12 As shown, the process includes:

[0225] Steps 1200-1201: are exactly the same as steps 500-501, and will not be repeated here.

[0226] Step 1202: When the preset clustering parameter K is equal to 1 and the signal receiving end adopts the QPSK modulation mode for modulation, obtain the average value of each element of the first group of updated complex symbol data and the second group of updated The phase difference P0 of the average value of each element of the complex symbol data.

[0227] Here, the updated complex symbol data of the first group is The updated complex symbol data of the second group is

[0228] Specifically, the ...

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Abstract

The embodiment of the invention discloses a frequency offset estimation method of a long-term evolution (LTE) system. The method includes: obtaining two groups of multiplexing symbol data demodulated at any antenna port of a signal sending terminal according to two different orthogonal frequency division multiplexing (OFDM) symbols; merging and clustering the two groups of multiplexing symbol data in sequence when a preset clustering parameter K is greater than 1, and obtaining Q clusters; selecting one cluster from the obtained Q clusters, and obtaining an average phase difference of elements corresponding to the two OFDM symbols in the selected cluster; and obtaining a frequency offset estimated value of the LTE system based on the obtained average phase difference and the difference of starting times of the two corresponding OFDM symbols. The embodiment of the invention also discloses a frequency offset estimation apparatus of the LTE system.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a frequency offset estimation method and device for a Long Term Evolution (LTE) system. Background technique [0002] LTE is a wireless communication system based on Orthogonal Frequency Division Muplexing (OFDM) technology, which can adopt Frequency Division Duplexing LTE (FDD-LTE) mode or Time Division Duplexing (Time Division Duplexing LTE, TD -LTE) mode; figure 1 It is a schematic diagram of the frame structure of FDD-LTE in the prior art, such as figure 1 Shown, a radio frame (Radio Frame) length T f is 10ms, here, T f =307200T s ; A radio frame includes 10 subframes (Subframe); a subframe length T is 1ms, and each subframe includes two time slots, figure 1 Among them, #0 to #19 represent 20 time slots in a radio frame, and the length of each time slot is T slot is 0.5ms, here, T slot =15360T s . [0003] figure 2 A schematic diagram of the time-domai...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/266H04L27/2662H04L27/2695H04L27/3854
Inventor 厉正吉
Owner CHINA MOBILE COMM GRP CO LTD
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