Frequency calibrating method and device under TD-SCDMA mode

A TD-SCDMA and frequency calibration technology, applied in the field of frequency calibration methods and devices, can solve the problems of reducing spectrum utilization, deteriorating system performance, increasing system overhead, etc., to improve spectrum utilization and frequency calibration accuracy, and improve frequency calibration Accuracy, the effect of improving spectrum utilization

Inactive Publication Date: 2014-11-12
广州钟鼎木林网络技术有限公司
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  • Application Information

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Problems solved by technology

A large phase deflection will lead to misjudgment of data symbols after coherent demodulation, thus severely deteriorating system performance
[0019] In the current high-speed mobile environment, the method for TD-SCDMA system to calibrate the frequency offset is to insert symbols known to both the transceiver and the receiver in the data field of the transmitter, and the receiver uses the known symbols to calibrate the detection results; because Several symbols are inserted in the data field, which increases additional system overhead and reduces spectrum utilization; and this method is limited by the length of the data field, and the frequency calibration accuracy is not high

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  • Frequency calibrating method and device under TD-SCDMA mode
  • Frequency calibrating method and device under TD-SCDMA mode
  • Frequency calibrating method and device under TD-SCDMA mode

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Embodiment Construction

[0057] The idea of ​​the present invention will be set forth below in conjunction with the accompanying drawings, with reference to figure 2 , a frequency calibration method under the TD-SCDMA system, comprising steps:

[0058] S1, the first frequency offset calibration;

[0059] Use the downlink synchronization code in the sending and receiving data to perform the first frequency offset calibration on the receiver, and narrow the range of frequency offset calibration.

[0060] S2. The second frequency offset calibration.

[0061] Using the downlink synchronization code in the sending and receiving data and the intermediate code in the sending and receiving data to perform a second frequency offset calibration on the receiver, the frequency offset of the receiver is calibrated within the error tolerance range of the system.

[0062] The present invention calibrates frequency twice, the first time using the downlink synchronization code in the sending and receiving data to c...

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Abstract

The invention discloses a frequency calibrating method and device under a TD-SCDMA (time division-synchronization code division multiple access) mode, comprising the following steps: carrying out frequency deviation calibration on a receiver by the downlink synchronous code in the receiving and emitting data for the first time and reducing the frequency deviation calibration scope; carrying out second frequency deviation calibration on the receiver by the downlink synchronous code and the middle code in the receiving and emitting data for the second time; and calibrating the frequency deviation of the receiver into the allowable scope of the system. The frequency calibrating method and device have the advantages of reducing the expense of the system, and improving the spectrum efficiency and the frequency calibration precision of the system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a frequency calibration method and device under the TD-SCDMA system. Background technique [0002] With the rapid development of high-speed railways, higher and higher requirements are put forward for the stability of communication systems in high-speed mobile environments. In the receiver of the TD-SCDMA system, the frequency offset caused by the Doppler effect, etc. will produce phase deflection for the received data. The larger the frequency offset, the more serious the phase deflection, and the more obvious the impact on the coherent demodulation performance of the system , that is, the higher the moving speed, the greater the impact on the demodulation performance. [0003] The chip rate of the TD-SCDMA system is 1.28Mcps, and its subframe structure is as follows figure 1 As shown, each 5ms subframe consists of 3 special time slots and 7 regular time slots (TS0, TS1, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7073
Inventor 施英
Owner 广州钟鼎木林网络技术有限公司
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