Method and device for frequency bias estimation of TD-SCDMA terminal

A TD-SCDMA, frequency offset estimation technology, applied in the field of time division-synchronous code division multiple access terminal frequency offset estimation, to achieve the effects of improving effectiveness and accuracy, eliminating multipath interference, and improving data demodulation performance

Inactive Publication Date: 2012-08-08
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0008] The present invention provides a method and device for TD-SCDMA terminal frequency offset estimation. The technical problem to be solved is to improve the accuracy of frequency offset estimation without increasing the complexity of the system.

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  • Method and device for frequency bias estimation of TD-SCDMA terminal
  • Method and device for frequency bias estimation of TD-SCDMA terminal
  • Method and device for frequency bias estimation of TD-SCDMA terminal

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Embodiment Construction

[0036] The invention provides a method and a device for estimating frequency offset of a TD-SCDMA terminal in a TD-SCDMA system, which estimates the frequency offset between the terminal and a base station. The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] First, see Figure 1A and Figure 1B shown, where Figure 1A is the frame structure of the TD-SCDMA system, Figure 1B It is a schematic diagram of the service time slot structure of the TD-SCDMA system. The length of a TD-SCDMA subframe is 5ms, and each subframe is divided into 7 service time slots (TS0-TS6) and 3 special time slots with a length of 675μs. The 3 special time slots include: downlink pilot time Slot (DwPTS, Downlink Pilot Time Slot), Guard Interval (GP) and Uplink Pilot Time Slot (UpPTS, Uplink Pilot Time Slot). Usually the traffic time slot TS0 is always allocated to the downlink (DL, Downlink), and the traffic time...

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Abstract

The present invention discloses a TD-SCDMA terminal frequency offset estimating method and a device thereof. The method comprises the steps of performing channel response estimation according to received Midamble codes by the terminal to obtain a channel response estimation result and a real channel response estimation result; selecting effective aperture meeting predetermined conditions from thereal channel response estimation result and determining channel response of all the pathways except special pathways; fitting a multi-pathway Midamble code sequence except special pathways according to the channel response of all the pathways except special pathways and the local Midamble code; subtracting the received Midamble code from the fitted multi-pathway Midamble code sequence except special pathways and estimating Midamble code sequence of the special pathway; obtaining frequency offset of the current time slot according to the frequency offset information carried by the Midamble sequence of the special pathway. According to the present invention, validity and precision of the frequency offset estimation can be all improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for frequency offset estimation of Time-Division Synchronization Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization Code Division Multiple Access) terminals. Background technique [0002] In the TD-SCDMA system, due to the influence of Doppler frequency shift and the error accumulation of the local crystal oscillator, the sampling frequency of the terminal equipment cannot always be consistent with the carrier frequency of the signal sent by the base station, which will cause a certain frequency drift and make the receiver The phase of the signal also drifts, which adversely affects end systems using coherent demodulation, resulting in poor reception performance. Therefore, the carrier frequency deviation must be estimated and compensated to maintain carrier synchronization. [0003] The frequency offset estimation i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/02H04J13/10
Inventor 陈江杉
Owner ST ERICSSON SEMICON BEIJING
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