TD-LTE cell search synchronization method based on CP flat top method

A cell search and flat-top technology, applied to electrical components, transmission systems, etc., to achieve the effect of low complexity and easy implementation

Inactive Publication Date: 2013-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The maximum likelihood estimation based on CP also has its shortcomings. This method is to estimate the delay and frequency offset when the CP type of the system is known, but the CP type in the actual system is unknown.

Method used

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  • TD-LTE cell search synchronization method based on CP flat top method
  • TD-LTE cell search synchronization method based on CP flat top method
  • TD-LTE cell search synchronization method based on CP flat top method

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Embodiment Construction

[0030] The specific embodiments of the present invention are described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be particularly noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0031] In the present invention, consistent with the prior art, PSS and SSS are transmitted in the downlink.

[0032] figure 1 It is a schematic diagram of the PSS / SSS processing flow of the TD-LTE cell base station in the present invention. Such as figure 1 As shown, in the embodiment, the processing flow of PSS / SSS is:

[0033] S101: Generate a PSS / SSS frequency domain sequence, where the PSS frequency domain sequence is generated by the ZC (Zadoff-Chu) sequence, the SSS frequency domain sequence is generated by the m sequence, and the center subcarrier of the PS...

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Abstract

The invention discloses a TD-LTE cell search synchronization method based on a CP flat top method. A type of a CP is estimated directly by judging whether a likelihood function of a maximum likelihood estimation based on the CP encounters flat top or not, time delay and decimal frequency offset are carried out by using the maximum likelihood estimation based on the CP according to the type of the CP, frequency offset compensation is carried out on received signals according to the decimal frequency offset, then a PSS time domain sequence is extracted from the received signals according to the time delay, integral frequency offset is estimated, compensation is continually carried out on the received signals through the integral frequency offset to extract an SSS time domain sequence, and the ID of a cell can be obtained through the PSS time domain sequence and the SSS time domain sequence. Therefore, the TD-LTE cell search synchronization method based on the CP flat top method combines a traditional PSS with a cross-correlation method of a local sequence and a self-correlation method of the maximum likelihood estimation based on the CP, and can obtain the type of the CP by judging the flat top of the maximum likelihood function under the situation that the type of the CP is unknown. The TD-LTE cell search synchronization method based on the CP flat top method is low in complexity and easy to implement.

Description

Technical field [0001] The present invention belongs to the field of wireless communication technology, and more specifically, relates to a TD-LTE cell search synchronization method based on a CP flat top method. Background technique [0002] Among existing communication technologies, LTE (Long Term Evolution, Long Term Evolution) adopts a multiple access technology based on Orthogonal Frequency Division Multiplexing (OFDM). OFDM is a multi-carrier transmission technology. Its basic principle is to convert serial high-speed data streams into parallel low-speed data streams and transmit them simultaneously on multiple parallel orthogonal sub-carriers. In order to avoid inter-carrier interference in the traditional multi-carrier system, each sub-carrier does not overlap in the frequency band, so the utilization rate of the frequency band is low, and the frequency offset of each sub-carrier in the OFDM system is overlapped, and the sub-carrier signals are maintained well. The ortho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7083
Inventor 胡苏徐滢赵国栋武刚李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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