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Signal capture method and device

A signal capture and complex signal technology, applied in wireless communication, electrical components, etc., can solve the problems of weakened signal strength and undetectable TC-OFDM system signal

Active Publication Date: 2016-10-12
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] During the signal transmission process of the TC-OFDM system, the signal strength of the TC-OFDM system is greatly weakened due to reasons such as obstacle occlusion and same-frequency signal interference.
When the carrier to noise ratio (CNR) of the signal is lower than a certain value, the common parallel code acquisition algorithm will not be able to detect the weak TC-OFDM system signal

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Embodiment Construction

[0052] 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 creative efforts fall within the protection scope of the present invention.

[0053] figure 1 A schematic flow chart of a signal acquisition method provided by an embodiment of the present invention, the signal acquisition method is applied to a time division code division orthogonal frequency division multiplexing TC-OFDM system, including the following steps:

[0054] S101: Receive a radio frequency signal from a TC-OFDM base station, and perform frequency down-conversion and low-pass filtering on the radio frequency signal to obtain a com...

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Abstract

The embodiment of the invention discloses a signal capture method and device. The method and the device are applied to a time division and code division orthogonal frequency division multiplexing TC-OFDM system. The method comprises the steps of carrying out incoherent loss compensation on an incoherent integral result Z (n), judging whether the incoherent integral result after the incoherent loss compensation satisfies a preset threshold judging condition or not; and capturing signals if the preset threshold judging condition is satisfied. According to the method and the device, through combination of coherent / incoherent integrals and loss compensation of the incoherent integral result, the signals are captured; a relative capture peak can be effectively improved; the capture missing probability of weak signals can be reduced; therefore, the capture capability of the location receiver of the TC-OFDM system to the weak signals can be improved; and the weak signals can be captured effectively.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a signal acquisition method and device applied to a Time Division Code Division Orthogonal Frequency Division Multiplexing (TC-OFDM) system. Background technique [0002] With the rapid development of wireless networks, Location Based Service (LBS) has been gradually integrated into people's daily life. Currently, Global Navigation Satellite System (GNSS) can provide precise location information for our outdoor activities. With the gradual increase of large buildings in cities, people's activity space has shifted from outdoor to indoor activities, so precise positioning in indoor environments has become more and more important. [0003] Time-division-code-division-orthogonal-frequency-division multiplexing (TC-OFDM) system is developed for the precise positioning of indoor environments, and can provide wide-area high-precision indoor and outdoor location services....

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Application Information

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IPC IPC(8): H04W64/00
CPCH04W64/00
Inventor 邓中亮蒋澍莫君焦继超于盛昌徐福海贾步云
Owner BEIJING UNIV OF POSTS & TELECOMM
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