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Spread spectrum communication method based on multi-level quasi-orthogonal spread spectrum code sequence

A technology of spread spectrum code sequence and spread spectrum communication, which is applied in the direction of electrical components, multiplexing code generation, transmission system, etc., and can solve the cycle limitation of spread spectrum communication transmission rate, large correlation coefficient of pseudo-random code, system multiple access interference, etc. question

Inactive Publication Date: 2013-03-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] In order to solve the problems that the transmission rate of the existing spread spectrum communication is limited by the period of the spread spectrum code, there is multiple access interference between the systems, and the correlation coefficient of the pseudo-random code used is relatively large, the present invention proposes a multi-level quasi-orthogonal spread spectrum based Code Sequence Spread Spectrum Communication Method

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  • Spread spectrum communication method based on multi-level quasi-orthogonal spread spectrum code sequence
  • Spread spectrum communication method based on multi-level quasi-orthogonal spread spectrum code sequence
  • Spread spectrum communication method based on multi-level quasi-orthogonal spread spectrum code sequence

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specific Embodiment approach 1

[0034] Specific implementation mode one, combine figure 1 , figure 2 and Figure 27 Description of this embodiment, a spread spectrum communication method based on a multi-level quasi-orthogonal spread spectrum code sequence, which is completed based on a synchronous spread spectrum communication system. The synchronous spread spectrum communication system includes a transmitting end system 1, a receiving end System 2, parameter memory 3 and sequence generator 4;

[0035] The signal output end of the sequence generator 4 is connected to the pseudo-random code sequence input end of the parameter memory 3, and the two pseudo-random code sequence output ends of the parameter memory 3 are respectively connected to the pseudo-random code sequences of the sending end system 1 and the receiving end system 2 input terminal;

[0036] The process that described sequence generator 4 generates one group of pseudo-random code sequence is:

[0037] Step 1, the orthogonal code group i...

specific Embodiment approach 2

[0048] Specific implementation mode two, combine figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that the transmitting end system 1 is composed of an encoder 1-1, a first multiplier 1-4, a modulator 1-5, and a first frequency converter 1 -6, power amplifier 1-7 and radio frequency antenna 1-8 are formed, and a data input end of the first multiplier 1-4 is the pseudo-random code sequence input end of sending end system 1, and described first multiplier 1-4 The other data input end of the first multiplier is connected with the data output end of the encoder 1-1, the data output end of the first multiplier 1-4 is connected with the data input end of the modulator 1-5, and the signal output end of the modulator 1-5 It is connected with the signal input end of the first frequency converter 1-6, and the signal output end of the first frequency converter 1-6 is connected with the signal input end of the power amplifier 1-7,...

specific Embodiment approach 3

[0051] Specific implementation mode three, combine Figure 27 This embodiment is described. The difference between this embodiment and the first embodiment is that the receiving end system 2 is composed of a receiving antenna 2-1, a low noise amplifier 2-2, a second frequency converter 2-3, a filter 2- 4, the demodulator 2-5, the second multiplier 2-6 and the decision device 2-9 are formed, the signal output end of the receiving antenna 2-1 is connected with the signal input end of the low noise amplifier 2-2, the low noise amplifier 2 The signal output terminal of -2 is connected with the signal input terminal of the second frequency converter 2-3, the signal output terminal of the second frequency converter 2-3 is connected with the signal input terminal of the filter 2-4, and the signal of the filter 2-4 The output end is connected with the signal input end of the demodulator 2-5, and the data output end of the demodulator 2-5 is connected with a data input end of the sec...

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Abstract

The invention relates to a spread spectrum communication method based on a multi-level quasi-orthogonal spread spectrum code sequence, which belongs to the technical field of spread spectrum communication and solves the problems that the transmission rate of the existing spread spectrum communication is limited, the multi-access Interference exists in systems, the chip cycle is limited by system capacity, and the correlation coefficient of the applied pseudo-random code is large. The method is realized based on a spread spectrum communication system, and when the spread spectrum communication system is a synchronous communication system, a sequence generator generates a group of pseudo-random code sequences as follows that: 1, an orthogonal code group is expressed as an M*N matrix, wherein N is the number of code elements of orthogonal codes in a chip cycle, and M is the number of users which can be accommodated in a system; 2, an optimization method is used to solve an objective function so as to obtain an orthogonal code xi, j with a cross-correlation function of the synchronous system as the objective function; and 3, a group of pseudo-random code sequences are obtained through forming orthogonal code data with xi, j satisfying requirements in Step 2. The invention is applicable to the communication field with high-speed transmission.

Description

technical field [0001] The invention relates to the technical field of spread spectrum communication. Background technique [0002] The spread spectrum communication (referred to as spread spectrum communication or spread spectrum communication) system uses a specific spread spectrum function to spread the spectrum of the transmission signal and then sends it to the channel for transmission; at the receiving end, the corresponding technical means are used to compress the expanded spectrum and restore it to The bandwidth of the original transmitted signal. Spread spectrum communication technology is a technology with excellent anti-interference performance. It has many advantages such as good anti-interference performance, strong selective addressing ability, low spectral density, and mitigation of multipath effects. It is currently used in military and civilian communication systems. Has been widely used. [0003] In the spread spectrum communication system, the pseudo-ran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7103H04J13/12
Inventor 沙学军邱昕宁晓燕吴宣利白旭张钦宇
Owner HARBIN INST OF TECH
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