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Quadratic phase coupling multi-user frequency difference UNB communication method

A secondary phase and transmission method technology, applied in the field of digital information transmission, can solve problems such as interference, poor signal anti-interference ability, and susceptibility to adjacent channel interference

Active Publication Date: 2018-09-21
XI AN JIAOTONG UNIV
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Problems solved by technology

It should be emphasized that the overall bandwidth occupied by the actual transmitted signal is very wide. However, in the analysis of spectral efficiency, not all of its spectrum is completely included, but the power spectrum attenuation of part of the sideband information is compared with the carrier The part with frequency greater than 60dB is regarded as invalid interference
[0004] The signal anti-interference ability of the existing UNB technology is poor, relying only on the extremely small signal mutation characteristics, the frequency band between adjacent channels is narrow, it is easy to be interfered by adjacent channels, and it is difficult to improve the detection performance
Furthermore, the signal energy efficiency of this technology is low: the main power of the signal is concentrated on the carrier frequency line spectrum, and the single frequency line spectrum does not carry modulation information
In addition, although the existing ultra-narrowband modulation technology for a single user can obtain extremely narrow channel bandwidth, it is difficult to avoid the serious impact of small frequency offsets, and cannot satisfy the multi-user multi-service rate, asynchronous Or synchronization and other communication needs

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Embodiment

[0128] Table 1 System Scheme Implementation Parameters

[0129]

[0130] When there is N in the systemf = When there are 100 single-frequency signals, if the secondary phase coupling characteristics are not considered, at most 11 groups of frequency combination pairs with different frequency differences can be obtained, and the system can accommodate up to 5 users; when the frequency coupling characteristics in the secondary phase coupling are considered , 27 groups of single-frequency signal combinations that meet the frequency coupling conditions can be found, and 26 groups of binary bit signals allocated to different users can be extracted from them, that is, they can be allocated to 13 users in the communication system at most. The frequency coding combination results under different considerations are shown in Table 2:

[0131] Table 2(a) frequency code combination without considering the secondary phase coupling

[0132]

[0133] Table 2(b) frequency code combinat...

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Abstract

The invention discloses a quadratic phase coupling multi-user frequency difference UNB communication method, and the method comprises the following steps: 1) a frequency difference combined signal transmitting end module uses quadratic phase coupling to realize modulation signal coding forms of different frequency difference distinguishing digital logic information in a UNB communication network,designs an allocation scheme through single-frequency signal phase coupling of multiple users in a frequency difference UNB system, and allocates frequency combinations with valid modulation information and different frequency difference for each user; 2) a frequency difference combined signal receiving end module realizes a parallel analysis mode for multi-user anti-interference linear and nonlinear multi-user performance for the multi-frequency combined signals of such type. The method provided by the invention is suitable being used in a multi-user UNB-IoT communication network, and can deploy more system users; compared with the conventional single-user ultra-narrow bandwidth very-minimum waveform difference keying (VWDK) technology, the method obtains lower bit error rate performanceunder certain signal-to-noise ratio condition; and the method realizes better frequency offset resistance performance.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a secondary phase coupling multi-user frequency difference UNB communication transmission method. Background technique [0002] With the rapid development of a new generation of wireless communication technology and the popularization and application of the Internet of Things in the communication industry, the communication between people and people, people and things, and things and things has become a reality. The traditional synchronous communication mode of a single user can no longer meet the current rapid information service needs, and the focus of the communication industry is gradually shifting to multi-user distributed and asynchronous communication. At the same time, combined with the application of Internet of Things communication, from the perspective of low carbon, saving spectrum resources, improving spectrum efficiency, expandin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/12
CPCH04L25/03159H04L27/12
Inventor 杜清河段奥琴赵卫东
Owner XI AN JIAOTONG UNIV
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