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Frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization

A TD-SCDMA, communication system technology, applied in synchronization devices, wireless communication, communication between multiple stations, etc., can solve the problem of improving frequency offset and phase estimation performance, large mean square error of frequency offset estimation, increasing frequency domain Estimating algorithm implementation complexity and other issues

Inactive Publication Date: 2009-10-07
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, in practical applications, there are two problems in the frequency domain estimation algorithm: first, the implementation of the frequency domain estimation algorithm is relatively complicated; second, in order to improve the frequency resolution of the frequency domain estimation algorithm, zero symbols need to be filled in the received signal, which will increase Implementation Complexity of Frequency Domain Estimation Algorithm
However, by analyzing relevant literature and invention patents, it can be found that none of the existing frequency offset and phase estimation schemes can effectively improve the performance of frequency offset and phase estimation from the perspective of rational use of observation signal samples. , due to the limited number of pilot symbols and the large mean square error of frequency offset estimation, it is difficult to meet the requirements of receiving synchronization in actual communication systems

Method used

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  • Frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization
  • Frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization
  • Frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization

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Embodiment

[0054] figure 1 It shows the frequency offset and phase estimation method proposed by the present invention, which belongs to the synchronization process after reception filtering, resampling, symbol synchronization and subframe synchronization of the TD-SCDMA communication system, and its input signal includes the current neighbor determined by subframe synchronization positioning P-bit pilot symbols r(kT s ) and r[(L+k)T s ], and the corresponding reference pilot symbols a(kT s ) and a[(L+k)T s ],and

[0055] r ( kT s ) = a ( kT s ) e j ( 2 π F d k T s ...

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Abstract

The invention discloses a frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization; the invention uses fractional step estimation strategy of two periods of initial frequency offset estimation and precise frequency offset and phase estimation, combines and uses two groups of pilot frequency identifier sequences in present adjacent two sub-frames having related frequency offset, implements TD-SCDMA communication system frequency offset and phase estimation through differential phase calculation. The method has precise frequency offset and phase estimation under middle and high signal-to-noise ratio; fluctuation range of estimated value is less.

Description

technical field [0001] The invention relates to a frequency offset and phase estimation method in a time division synchronous code division multiple access wireless communication system (abbreviated as TD-SCDMA system). Background technique [0002] Synchronization technology is an indispensable key technology in the communication system. In the TD-SCDMA mobile communication system, it is required to establish transceiver synchronization between the base station and the mobile terminal in order to transmit and receive signals. Due to the time division duplex (TDD) technology used in the TD-SCDMA system, the quality of synchronization not only directly affects the basic requirements of network operation and communication connections, but also relates to system capacity and quality of service (QoS). However, in a wireless communication system, due to the frequency difference between the sending end device and the receiving end device, and the Doppler frequency shift caused by ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04B7/26
Inventor 陈庆春周明刘恒马征郝莉范平志
Owner SOUTHWEST JIAOTONG UNIV
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