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Frequency deviation correction method and cell initial search method of broadband time-division duplex cellular system

A time-division duplex and frequency offset correction technology, which is applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems that cannot meet the accuracy requirements of the duplex cellular system, achieve fast frequency offset correction, simple implementation, and The effect of improving accuracy

Active Publication Date: 2011-11-30
SHANGHAI ULTIMATE POWER COMM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] What the present invention aims to solve is that the prior art intermediate frequency offset correction method cannot meet the precision requirements required by the broadband time division duplex cellular system

Method used

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  • Frequency deviation correction method and cell initial search method of broadband time-division duplex cellular system
  • Frequency deviation correction method and cell initial search method of broadband time-division duplex cellular system
  • Frequency deviation correction method and cell initial search method of broadband time-division duplex cellular system

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Embodiment Construction

[0061] The frame structure of TD-SCMDA and its evolution system is as figure 1 Shown. In the figure, each wireless subframe is composed of 7 time slots TS0, TS1 to TS6, and three special time slots. Among them, the time slots TS0 to TS6 are used to transmit data, and the three special time slots are DwPTS (downlink pilot channel), UpPTS (uplink pilot channel) and GP (transition protection time slot). DwPTS is used to transmit the initial cell For the searched downlink pilot, UpPTS is used to send random access signals, and GP is the guard interval for converting the downlink time slot to the uplink time slot, and its length determines the maximum cell coverage radius.

[0062] The initial cell search of the UE refers to the process from starting the UE to searching for a suitable cell. Only after logging in to the cell, the UE can obtain more information about the cell and neighboring cells, and monitor the paging of the wireless network or initiate a call. The initial cell sea...

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Abstract

A frequency offset correction method for wideband time division duplex cell communication system includes: receiving time domain sequences of the two pilot symbols having the scheduled interval in the time slot of transmitting broadcast channel; performing conjugate correlated operation between the two received pilot time domain sequences and the locally stored pilot time domain sequences corresponding to the pilot symbol; and performing the frequency offset correction according to the operation result. A method for cell first searching includes cell coarse synchronization , cell precise synchronization, cell coarse frequency offset correction and cell precise frequency offset correction, and the above frequency offset correction method is used to perform the cell precise frequency offset correction . The present invention increases the precision of frequency offset estimate in the user terminal, reduces the realization complexity at the same time, and provides an effective solution for realizing downlink synchronization and frequency offset correction by wideband time division duplex cell communication system.

Description

Technical field [0001] The invention relates to a broadband time division duplex cellular system with an evolution plan of TD-SCDMA (Time Division Synchronous Code Division Multiple Access), and in particular to a frequency offset correction method for a broadband time division duplex cellular system and a method for applying the method User terminal. Background technique [0002] TD-SCDMA is the only time division duplex (TDD, Time Division Duplex) mode among the three major international standards of the third-generation mobile communication system, which supports uplink and downlink asymmetric service transmission and has greater flexibility in spectrum utilization. The system integrates advanced technologies in wireless communications such as smart antennas, uplink synchronization, joint detection, and software radio, so that the system has high performance and spectrum utilization. [0003] With the development of society and the advancement of technology, people's requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26H04B7/26
CPCH04L27/2657H04L27/2675H04L27/2684H04L7/10
Inventor 孙韶辉于洋王映民
Owner SHANGHAI ULTIMATE POWER COMM TECH