EKF-based TC-OFDM receiver code tracking method and device

A TC-OFDM and receiver technology, which is applied in the code tracking field of time division code division orthogonal frequency division multiplexing receiver, can solve the problems of code loop loss lock, inability to calculate code phase error, sudden change of signal amplitude, etc.

Active Publication Date: 2017-06-27
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, during code tracking, due to noise effects and other reasons, there may be sudden changes in the signal amplitude
In this case, the received base station signal may exceed the signal amplitude threshold that the code ring discriminator in the TC-OF

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  • EKF-based TC-OFDM receiver code tracking method and device
  • EKF-based TC-OFDM receiver code tracking method and device
  • EKF-based TC-OFDM receiver code tracking method and device

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Embodiment Construction

[0080] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0081] figure 2 It is a structural diagram of a code tracking loop in an embodiment of the present invention. Such as figure 2 As shown, the code tracking loop of the embodiment of the present invention is composed of a carrier stripping operator, a code generator, a group of leading correlators, a group of lagging correlators, four integral-clearers, a carrier numerically controlled oscillator and an EKF. The signal S received by the receiver is stripped ...

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Abstract

The embodiment of the invention provides an EKF-based TC-OFDM receiver code tracking method and a device. The method comprises the following steps of receiving a target signal at the current moment, acquiring a local signal generated by a TC-OFDM receiver itself, subjecting the target signal and the local signal to correlation operations so as to obtain a signal observed value at the current moment, acquiring a state estimation value at the previous moment of the current moment, subjecting the signal observed value at the current moment and the state estimation value at the previous moment of the current moment to calculation based on the EKF algorithm, and obtaining a state estimation value at the current moment. The state estimation value comprises a code phase error and a signal amplitude. The code phase error and the signal amplitude are jointly used the state estimation value of the EKF for calculation. Therefore, the convergence speed and the robustness of a tracking loop are improved. As a result, the tracking sensitivity of the TC-OFDM receiver is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a code tracking method for time division code division orthogonal frequency division multiplexing (Time & Code Division-Orthogonal Frequency Division Multiplexing, TC-OFDM) based on Extended Kalman Filter (Extended Kalman Filter, EKF) and devices. Background technique [0002] In the TC-OFDM positioning system based on the terrestrial mobile broadcast network, the receiver is usually used for signal acquisition and tracking. Among them, the signal tracking mainly includes the code tracking process to track the captured signal, determine its code phase, and then achieve the purpose of positioning. [0003] figure 1 It is a schematic diagram of the existing code tracking loop structure. Such as figure 1 As shown, the existing code tracking loop is composed of a carrier stripping operator, a code generator, a set of leading correlators, a set of lagging correlator...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 邓中亮莫君贾步云李三川肖占蒙刘志超边新梅
Owner BEIJING UNIV OF POSTS & TELECOMM
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