Spread spectrum code synchronous transmitting method and device

A technology of synchronous transmission and spread spectrum code, applied in electrical components, transmission systems, etc., can solve problems such as inapplicability to large-scale network applications, application limitations, and reduced device stability, and reduce network structure and scale limitations. Achieve synchronous transmission and meet the effect of synchronization accuracy

Active Publication Date: 2013-08-28
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the spread spectrum code synchronous transmission technology based on GPS satellite timing can only be used in open outdoor areas. For large indoor buildings and urban canyon areas, due to the occlusion of GPS satellite signals, its application is limited
At the same time, the use of GPS equipment for timing synchronization complicates the networking of each sending node and increases the cost, resulting in a decrease in device stability
[0007] To sum up, in the process of realizing the present invention, the inventor found that the schemes of spreading code synchronization in the prior art have relatively serious limitations in use, complex networking structure, high cost, and are not suitable for large-scale networks. application
In the prior art, there is no reliable scheme for synchronous transmission of spreading codes to meet the requirements of high precision and simple network structure

Method used

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  • Spread spectrum code synchronous transmitting method and device
  • Spread spectrum code synchronous transmitting method and device
  • Spread spectrum code synchronous transmitting method and device

Examples

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Effect test

Embodiment 1

[0071] like figure 1 As shown, it is a flowchart of a method for synchronously transmitting spreading codes provided by an embodiment of the present invention, wherein,

[0072] Step 101, acquiring an external spread spectrum signal.

[0073] Step 102, generate a group of local codes locally and multiply and integrate them with the external spread spectrum signal respectively, calculate the square sum according to the result of the integration to obtain the integrated power value, and use the local code with the largest integrated power value as the matching local code, the group of local codes code at least two local codes.

[0074] Step 103, adjust the chip synchronization position of the matching local code, generate E, P, L three-way matching local code, and multiply and integrate the E, P, L three-way matching local code with the external spread spectrum signal respectively, according to the integral The sum of the squares of the results is obtained to obtain the corres...

Embodiment 2

[0079] like figure 2 As shown, it is a flowchart of a method for synchronously transmitting spreading codes provided by an embodiment of the present invention, wherein,

[0080] Step 201, acquire an external spread spectrum signal.

[0081] The external spread spectrum signal in the embodiment of the present invention is sent by the outdoor base station. In this step, the external spread spectrum signal may be received specifically by an antenna.

[0082] The external spread spectrum signal obtained here contains various information, and this embodiment mainly focuses on the spread spectrum code information used for clock synchronization, that is, the spread spectrum signal.

[0083] Step 202, generate I and Q two-way signals whose carrier phases are orthogonal to each other according to the external spread spectrum signal, multiply the I and Q two-way signals with a group of local codes generated locally and input them into the integrator, and the integrated result The sum...

Embodiment 3

[0106] like Figure 5 As shown, the embodiment of the present invention provides a spread spectrum code synchronous transmission device, the device includes a signal acquisition unit 301, a matching unit 302, a phase difference calculation unit 303, a capture unit 304 and a synchronous transmission unit 305, specifically as follows:

[0107] A signal acquisition unit 301, configured to acquire an external spread spectrum signal;

[0108] The matching unit 302 is used to locally generate a group of local codes and multiply and integrate them with the external spread spectrum signal respectively, calculate the square sum according to the result of the integration to obtain the integrated power value, and use the local code with the largest integrated power value as the matching local code, The set of local codes has at least two local codes;

[0109] The phase difference calculation unit 303 is used to adjust the chip synchronization position of the matching local code, generat...

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Abstract

The invention discloses a spread spectrum code synchronous transmitting method and a spread spectrum code synchronous transmitting device and belongs to the technical field of wireless signals. The method comprises the following steps that external spread spectrum signals are obtained; a group of local codes are locally generated and are respectively multiplied and integrated with external spread spectrum signals, the quadratic sum is obtained according to integral results, the integral power value is obtained, and the local code with the maximal integral power value is used as a matching local code; E, P and L matching local codes are generated and are respectively multiplied and integrated with external spread spectrum signals, the quadratic sum is obtained according to integral results, three paths of integral power values are obtained, and the phase difference is obtained according to the three paths of integral power values; the matching local code when the phase difference is zero is used as a capturing local code; and synchronous transmitting codes are generated according to the capturing local code and are sent. The method and the device have the advantages that the synchronous transmitting of the transmitting codes and the external spread spectrum signals can be realized, the limitation of spread spectrum code synchronization on the network structure and scale is reduced, and the demands of networks on high synchronization precision, simple structure and low cost are met.

Description

technical field [0001] The invention relates to the technical field of wireless signals, in particular to a method and device for synchronous transmission of spreading codes. Background technique [0002] Spread spectrum communication is a preface technology that has been rapidly developed in the current information field. Because of its strong interference, good confidentiality, low power consumption and many other advantages, it has become a very important communication method. Synchronization is the key technology of spread spectrum communication. How to maintain a good synchronization device to work effectively and reliably has always been the focus of research by researchers. In some application fields, such as location services, vehicle navigation, etc., the local receiving end not only needs to be able to receive external spread spectrum signals synchronously, but also needs to transmit local spread spectrum codes synchronously to realize multi-code joint decoding of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7073
Inventor 邓中亮李序袁协张宇袁壮胡月舟杨乐李长明翟堃
Owner BEIJING UNIV OF POSTS & TELECOMM
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