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Signal synchronization method, receiving end and system

A signal synchronization and receiver technology, applied in the field of communication, can solve the problems of long time and large amount of calculation.

Active Publication Date: 2014-09-24
LENOVO (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing timing synchronization and frequency offset estimation methods require a very large amount of calculation when obtaining high synchronization accuracy, resulting in a long time-consuming problem, an embodiment of the present invention provides a signal synchronization method, a receiving end and system

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  • Signal synchronization method, receiving end and system
  • Signal synchronization method, receiving end and system

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Embodiment 1

[0173] Please refer to image 3 , which shows a method flowchart of the signal synchronization method provided by Embodiment 1 of the present invention. This embodiment is mainly illustrated by taking the signal synchronization method applied to a receiving end as an example. The receiving end may be a UE (User Equipment, user equipment), specifically a mobile phone used by a user; the corresponding sending end may be a base station. The signal synchronization methods include:

[0174] Step 301, obtaining the sequence y to be analyzed from the received time domain signal;

[0175] Step 302, after downsampling the sequence y to be analyzed by α times to obtain a downsampling sequence, perform an initial timing estimation according to the downsampling sequence and n different preset integer multiple frequency offset candidate values, and determine the initial timing position T coarse , Integer frequency offset estimate and the primary synchronization sequence corresponding t...

Embodiment 2

[0181] Since the previous embodiment only completes the OFDM symbol block synchronization, for a more detailed description, the second embodiment that simultaneously completes the OFDM symbol block synchronization, wireless data frame timing synchronization and frequency offset estimation is also provided. In a nutshell, Embodiment 2 can be divided into: an initialization phase, an initial timing estimation phase, an initial frequency offset estimation phase, a timing re-estimation phase, an SSS detection phase, and a frequency offset re-estimation phase. Wherein, after the timing re-estimation phase is completed, the OFDM symbol block synchronization process can be completed; after the SSS detection phase is completed, the wireless data frame timing synchronization process can be completed; after the frequency offset re-estimation phase is completed, the frequency offset estimation process can be completed. details as follows:

[0182] Please refer to Figure 4A , which show...

Embodiment 5

[0338] Please refer to Figure 7 , which shows a structural block diagram of the communication system provided by Embodiment 5 of the present invention. The communication system includes a base station 720 and a receiving end 740 . in:

[0339] The base station 720 is a base station conforming to related protocols of the LTE system;

[0340] The receiving end 740 may be the receiving end provided in Embodiment 3 or Embodiment 4.

[0341] To sum up, in the communication system provided by this embodiment, the initial timing estimation is performed on the down-sampled sequence at the receiving end by using integer multiple frequency offset compensation, and the result of the initial timing estimation is used as the input of the initial estimation of the frequency offset. The result of partial initial estimation is used as the input of timing re-estimation, so that frequency offset compensation and timing synchronization are combined to realize joint synchronization in the tim...

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Abstract

The invention discloses a time domain joint synchronization method of downlinks, a receiving end and a system and belongs to the field of communication. The method includes the following steps: obtaining a to-be-analyzed sequence y from a received time domain signal; carrying out timed initial estimation after carrying out Alpha-multiple downsampling on the to-be-analyzed sequence y; carrying out frequency deviation initial estimation after carrying out frequency deviation compensation on the to-be-analyzed sequence y according to an integer-multiple frequency deviation estimation value Epsilon <^> obtained through use the timed initial estimation to obtain a decimal-multiple frequency deviation estimation value Epsilon <^> <f>; after carrying out frequency deviation compensation on the to-be-analyzed sequence y according to the integer-multiple frequency deviation estimation value Epsilon <^> and the decimal-multiple frequency deviation estimation value Epsilon <^> <f>, using a position interval estimated by an initial timing position and a main synchronization sequence to carry out timed reestimation so as to obtain an accurate timing position. The time domain joint synchronization method of the downlinks, the receiving end and the system solve a problem that the prior synchronization and frequency deviation estimation method is low in efficiency and long in consumed time and achieve an effect that the operation complexity is reduced and a timed synchronization result and a frequency deviation estimation result can be mutually combined to realize rapid synchronization is achieved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a downlink time domain joint synchronization method, receiving end and system. Background technique [0002] The LTE (Long Term Evolution, long-term evolution) system is a communication system that uses OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-carrier modulation technology at the physical layer. The basic principle of OFDM technology is to convert high-speed serial data streams into N-channel low-rate data streams for parallel transmission. Each data stream is carried by sub-carriers with orthogonal discrimination, which can effectively resist frequency selective fading and significantly improve the system efficiency. throughput. But for OFDM technology, both timing deviation and frequency deviation may make the system performance extremely deteriorated. Therefore, timing synchronization and frequency synchronization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
CPCH04W56/003H04L7/0016H04L27/26H04W56/0035H04W56/0085H04J11/0073H04J11/0076H04L5/0007H04L27/2659H04L27/266H04L27/2665
Inventor 张立王洁
Owner LENOVO (BEIJING) CO LTD
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