Coherent spread spectrum communication system

A spread spectrum communication and spread spectrum technology, which is applied in the field of spread spectrum communication, can solve the problems that the spread spectrum communication system cannot work normally, and achieve the effect of stable and reliable circuit performance

Active Publication Date: 2015-12-16
佛山市赛瑞通讯有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the code synchronization loop and the carrier tracking loop are out of lock, the spread spectrum communication system cannot work normally

Method used

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  • Coherent spread spectrum communication system
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Examples

Experimental program
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Embodiment Construction

[0010] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0011] Such as figure 1 As shown, the coherent spread spectrum communication system consists of a spread spectrum transmitter 1 and a spread spectrum receiver 2 . The spread spectrum transmitter 1 uses the orthogonal spread spectrum code 11 to modulate 13 the data code 12, then adds 15 to the orthogonal spread spectrum code 14, modulates 16 the added baseband signal to the intermediate frequency carrier 17, and then Radiate out through the up-conversion channel 18 and the transmitting antenna 19; the spread-spectrum receiver 2 uses the antenna 21 to receive the radio frequency signal, and down-converts it to an intermediate frequency through the down-conversion channel 22, and the intermediate frequency signal passes through the matched filter 23 and the matched filter 24 respectively, wherein The impulse response of the matched filter 23 ...

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Abstract

The invention discloses a coherent spread spectrum communication system. The system is composed of a spread spectrum transmitter and a spread spectrum receiver. The spread spectrum transmitter uses an orthogonal spread spectrum code to modulate a data code. Another orthogonal spread spectrum code is further added. Baseband signals after the addition are modulated to a medium-frequency carrier wave and further radiated out through an up-conversion channel and a transmitting antenna. The spread spectrum receiver uses an antenna to receive a radiofrequency signal which undergoes down conversion through a down conversion channel and is converted into a medium frequency one. The medium-frequency signal passes through two matching filters. The impulse responses of the two matching filters are respectively the arithmetic products of the opposite sequence of each orthogonal spread spectrum code and the medium-frequency carrier wave. After output signals of the two filters are multiplied, the signals then pass through a low pass filter. Absolute value taking operations and symbol taking operations are respectively performed on an output signal of the low pass filter. An absolute value taking operation output signal undergoes threshold decision. When a threshold value is exceeded, it shows that a pseudo code is captured. A symbol taking operation output signal is then a data signal after a demodulation process.

Description

technical field [0001] The invention belongs to the technical field of spread spectrum communication, and in particular relates to a coherent spread spectrum communication system. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) communication is a communication technology that uses spreading codes to broaden the spectrum of the transmitted data signal so that the bandwidth it occupies is much larger than the bandwidth required to transmit information. Direct-sequence spread spectrum communication has strong anti-interference ability, less interference to other communication systems, difficult to intercept, and multiple access multiplexing, etc. It is widely used in mobile communication, satellite communication, electronic countermeasures and other fields. [0003] In a spread spectrum communication system, in order to demodulate the data, the receiver usually needs two tracking loops, namely the code synchronization loop and the carrier tracking loop, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/7077
CPCH04B1/7077H04L27/2659H04L27/266H04L2027/0026
Inventor 王韬谢晓姣宗京京沈亦豪高瞻廖勇吴皓威覃大伟徐建
Owner 佛山市赛瑞通讯有限公司
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