Multi-point data transmission system based on wireless spread spectrum communication
A data transmission system, wireless spread spectrum technology, applied in the transmission system, electrical components, etc., can solve the problems of inability to receive data from multiple transmitters at the same time, reduce system data transmission efficiency, and low data transmission speed, so as to reduce power consumption and volume, good scalability, and less noise
Active Publication Date: 2014-08-06
BEIJING SAGETOWN TECH
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Problems solved by technology
[0002] The existing spread spectrum data transmission system generally has defects such as complex hardware structure and low data transmission speed. In addition, the receiving end of the traditional data transmission system generally adopts time-division communication when receiving data from multiple transmitting ends, and cannot receive data from multiple transmitting ends at the same time. data, which greatly reduces the data transmission efficiency of the system
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[0035] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:
[0036] The basic block diagram of the system of the present invention is figure 1 , the system can realize one-to-one and many-to-one spread spectrum wireless data transmission macroscopically. User data is transmitted wirelessly after direct sequence spread spectrum and BPSK (Binary Phase Shift Keying, Binary Phase Shift Keying) modulation at the sending end, and then recovered after down-converting, synchronous despreading and synchronous demodulation at the receiving end Raw data. When the system is one-to-one data transmission, a 31-bit spreading code can be used, and the system transmission speed is 80kbps; when the system is many-to-one transmission, a 127-bit spreading code is used, and the system transmission speed is 20kbps .
[0037] Figure 2a Shown is the hardware block diagram of the sending end of the present invention, the software pro...
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The invention discloses a multi-point data transmission system based on wireless spread spectrum communication. Both a transmitting terminal and a receiving terminal employ modular software and hardware designs, main signal processing work of the system is realized in a programmable logic device, a hardware structure is simplified, and system power consumption and volume are reduced. Simultaneously, the receiving terminal employs digital intermediate frequency reception technology to sample a signal at intermediate frequency, instant processing signal bandwidth in the digital intermediate frequency reception technology is substantially increased, a dynamic range is large, expandability is good, flexibility is high, simultaneously since a simulation link is reduced in a receiver, noise introduced from a front end is reduced, signal distortion is lessened, and a circuit is more concise. The receiving terminal employs a mode of carrying out parallel processing on received data, modularization of a software processing process is realized, and to different transmitting terminals, accurate reception can be realized only modifying a plurality of parameters. Simultaneously, a system capacity expanding method is simple, when quantity of the sending terminals is increased, and correspondingly increasing receiving terminal software modules is enough.
Description
technical field [0001] The present invention relates to a multi-point data transmission system based on wireless spread spectrum communication. The system mainly adopts direct sequence spread spectrum communication technology, which is used for simultaneous confidential data transmission between multiple transmitters and receivers. The system is easy to expand and configure flexible. Background technique [0002] The existing spread spectrum data transmission system generally has defects such as complex hardware structure and low data transmission speed. In addition, the receiving end of the traditional data transmission system generally adopts time-division communication when receiving data from multiple transmitting ends, and cannot receive data from multiple transmitting ends at the same time. data, which greatly reduces the data transmission efficiency of the system. [0003] The invention provides a spread spectrum data transmission system capable of multi-point high-s...
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IPC IPC(8): H04B1/707H04B1/7105
Inventor 吕英明苏军龙乐磊陈皓詹明静李国峰
Owner BEIJING SAGETOWN TECH