TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system

A relay system, frequency offset estimation technology, applied in baseband system components, shaping networks in transmitters/receivers, etc., can solve the problem of frequency offset estimation at the relay end

Inactive Publication Date: 2014-04-02
HEBEI UNIV OF TECH +1
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  • Abstract
  • Description
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for estimating the frequency offset of the TD-LTE relay system, which solves the problem of the uncertainty of the transmission bandwidth of the ...

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  • TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system
  • TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system
  • TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for relay system

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Embodiment

[0102] The frequency offset estimation process of the TD-LTE relay system is realized according to the following steps:

[0103] The first step is to obtain the position of the synchronization signal and the cell ID number in the cell identification group from the received signal of the relay terminal and cell group ID number information, thus obtaining the synchronization signal sequence received by the relay,

[0104] (1) First perform 1.92MHz time-domain A / D sampling on the received signal at the relay end, and then pass through a 0.54MHz low-pass filter to obtain a bandwidth signal of 1.08MHz in the central frequency band of the received signal where the PSS / SSS is located. Refer to TD-LTE Technical standards can know that the synchronization signal of the physical layer includes the primary synchronization signal PSS and the secondary synchronization signal SSS. Each synchronization signal occupies the time length of 1 OFDM symbol and is transmitted every 5ms. Regardle...

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Abstract

The invention provides a TD-LTE (Time Division-Long Term Evolution) frequency offset estimation method for a relay system and relates to services or facilities suitable for a wireless communication network. The method comprises the following steps: obtaining positions of synchronizing signals and information about cell ID (Identity) number and cell group ID number inside a cell identification group from receiving signals at a relay end, so as to obtain a synchronizing signal sequence received by a relay; secondly, generating a local PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) according to the obtained relay-end cell ID number and cell group ID number relay end; thirdly, carrying out an integer-frequency-offset estimation process by using the PPS received at the relay end and the obtained relay locally-generated PSS; and finally, carrying out integer-frequency-offset adjustment on the receiving signals of the PSS/SSS at the relay end by using the obtained result epsilon I of the integer-frequency-offset estimation, and carrying out fine-frequency-offset estimation process by using a corresponding algorithm. Therefore, the problem of the frequency offset estimation at the relay end can be solved, and the sending frequencies of the signals received at the relay end and the signals at a base station end are synchronous.

Description

technical field [0001] The technical solution of the present invention relates to a service or facility applicable to a wireless communication network, specifically a method for frequency offset estimation of a TD-LTE relay system. Background technique [0002] TD-LTE is a leap forward in the technology of mobile communication standard, and plays a connecting role in the development of mobile communication system. According to the existing spectrum allocation scheme, the TD-LTE system can obtain a large broadband spectrum in the higher frequency band, but at the same time it also increases the path loss and penetration loss in the high frequency band, resulting in a decrease in the coverage of wireless signals. Therefore, in R10 The protocol introduces relay technology to solve the above problems. In the TD-LTE relay system, Orthogonal Frequency Division Multiplexing (OFDM) technology, which is the core multiple access technology, is very sensitive to frequency offset, and ...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 刘剑飞边晓敬王蒙军曾祥烨郝禄国杨建坡
Owner HEBEI UNIV OF TECH
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