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Method and system for spreading and despreading information signal

A signal and spread spectrum communication technology, applied in the field of information signal spreading and despreading, can solve problems such as information leakage, prevent deciphering and monitoring, and improve confidentiality.

Active Publication Date: 2018-09-07
HUIZHOU TCL MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] However, when the call is established, the PN sequence is determined. Criminals can test the received signal by using different start bits. As long as the call time is long enough, they can get the call spread spectrum used. The start bit of the PN sequence, if the call is monitored, the information contained in the information signal in the communication will be leaked

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  • Method and system for spreading and despreading information signal
  • Method and system for spreading and despreading information signal
  • Method and system for spreading and despreading information signal

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0050] Due to the spread spectrum technology adopted in the prior art, the same PN sequence is used cyclically, which may cause hidden dangers in information security after long-term communication. The present invention provides a method for spreading and despreading information signals that can overcome the above defects. Methods and systems, in order to better analyze the methods and systems provided by the present invention, the following nouns are first described:

[0051] Sequence: a sequence of numbers consisting of a string of 0 or 1;

[0052] Sequence to be transmitted: a sequen...

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Abstract

The invention provides an information signal spectrum spreading and despreading method and system. when establishing communication with a mobile terminal, a base station distributes a start bit serial number and a model code for the mobile terminal, and sends the start bit serial number and the model code to the mobile terminal; the base station and the mobile terminal simultaneously begin to output circular PN sequences with the same frequency; in the communication process, the circular PN sequence used for each communication is obtained according to the distributed model code; the PN sequence is changed in each communication process, compared with the condition that the PN sequence is unchanged in the prior art, the method and system provided by the invention are capable of effectively preventing the communication process from being decoded and monitored by lawbreakers, the security in the communication process is improved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and system for spreading and despreading information signals. Background technique [0002] Because low-frequency signals are not suitable for long-distance transmission in the air, the concept of modulation and demodulation has been introduced in the process of mobile communication. The analogy between mobile communication and traditional postal letters is that modulation means that the sender (sender) sends the letter (information) , a sequence consisting of a string of 0s and 1s) is loaded into the envelope (carrier), and then sent (transmitted through the antenna), demodulation is the receiver (receiver) opens the envelope after receiving the letter (dials the carrier ) The process of getting the content of the letter (the information sent by the sender). In the above discussion, we assume that the communication parties are determined on a given carrier frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B1/7075
CPCH04B1/707H04B1/7075
Inventor 俞斌杨维琴
Owner HUIZHOU TCL MOBILE COMM CO LTD
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