Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
A technology of TD-SCDMA and Doppler frequency shift, which is applied in transmission system, digital transmission system, modulated carrier system, etc., to achieve the effect of eliminating influence, improving accuracy and reducing bit error rate
Inactive Publication Date: 2010-08-25
ZTE CORP
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The technical problem to be solved by the present invention is to provide a method for estimating and compensating the Doppler frequency s
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The invention relates to a Doppler frequency shift estimation and compensation method in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system. The method comprises the following step of: after a mobile terminal receives a time slot containing the data of the mobile terminal, obtaining a Doppler frequency offset value of a receiving signal of the current time slot through comparing the phase differences of channel estimation sequences of the current time slot and a comparison time slot. The compensation method of the Doppler frequency shift in the TD-SCDMA system comprises the following steps of: after the mobile terminal receives the time slot containing the data of the mobile terminal, obtaining the Doppler frequency offset value of the receiving signal of the current time slot through comparing the phase differences of the channel estimation sequences of the current time slot and the comparison time slot; and correcting the receiving signal in joint detection by combining with the joint combination. The invention improves the accuracy of channel estimation, eliminates the influences of the Doppler frequency shift on correctly receiving demodulation, reduces the error rate and improves the system performance and is particularly suitable for TD-SCDMA terminals under high-speed motion scenes.
Description
technical field The present invention relates to mobile communication technology, in particular to a method for estimating and compensating Doppler frequency shift in Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique TD-SCDMA (Time Division Synchronous Code Division Multiple Access) mobile communication system is a third-generation mobile communication system based on time division duplex and code division multiple access. It has the characteristics of flexible uplink and downlink configuration, low code rate, and high spectrum utilization. As shown in Figure 1, in the TD-SCDMA system, the basic unit of data transmission is a radio frame. 7 regular time slots (TS0~TS6) and 3 special time slots (downlink synchronization code segment DwPTS, guard interval GP and uplink synchronization code segment UpPTS) form a subframe, and two subframes (subframe #1 and subframe #2 ) constitute a wireless frame with a duration of 10ms. The dat...
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Login to view more IPC IPC(8): H04B1/707H04L25/02
CPCH04L2027/0067H04B1/7087H04L27/0014
Inventor 朱昀王曼
Owner ZTE CORP
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