A method of constant envelope multiplexing for multi-frequency and multi-valued signals
A constant-envelope, multi-frequency point technology, applied in the field of constant-envelope multiplexing of multi-frequency point multi-valued signals, can solve problems such as the inability to guarantee the power ratio requirements of BOC waveforms
Inactive Publication Date: 2020-07-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0007] Aiming at the defects of the prior art, the purpose of the present invention is to solve the problem that the existing multi-frequency point multi-value signal constant envelope multiplexing method adds some unnecessary constraints and limits its optimization search space, and can only ensure that the entire CBOC signal The received power of component matching meets the design requirements, but cannot guarantee the technical problem of power ratio requirements between the two BOC waveforms
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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0061] 1. Realize frequency pre-offset through complex subcarrier modulation
[0062] Assuming that there are multiple independent signal components corresponding to multiple different carrier frequencies, the complex subcarrier frequency is the deviation between multiple different carrier frequencies and the composite signal carrier frequency after signal component multiplexing, and these signa...
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The invention discloses a multi-frequency-point multi-value signal envelope-constant multiplexing method. The method comprises that N signal components independent from one another are determined, frequency shift is carried out on each of the N signal components according to difference between the carrier frequency of a composite signal and each of the N frequencies, and N composite subcarrier modulation signal components after frequency shift are obtained; according to a finite discrete value of chip waveform and a finite discrete value of subcarriers of the nth composite subcarrier modulation signal component after frequency shift, Mn possible values of the nth composite subcarrier modulation signal component after frequency shift are determined; the Mns corresponding to the composite subcarrier modulation signal components after frequency shift are multiplied to determine the total emission phase number; and corresponding power id determined according to a power loss factor of eachcomposite subcarrier modulation signal after frequency signal, a corresponding limit constraint expression is determined according to a phase look-up table, and multi-frequency-point envelop-constantmultiplexing of the N signal components independent from one another is realized. Thus, the multi-frequency-point envelop-constant multiplexing of multi-value signals is realized.
Description
technical field [0001] The present invention relates to the technical field of constant envelope multiplexing of signals, and more specifically, to a constant envelope multiplexing method of multi-frequency point multi-valued signals. Background technique [0002] With the continuous development of satellite navigation technology, in the future GNSS, multi-frequency and multi-level signals will become a very important trend in GNSS signal design. The multi-level signal has the characteristics of fast power spectrum out-of-band attenuation, good compatibility and excellent positioning performance, which has attracted many scholars at home and abroad to study it, and proposed a variety of multi-level signal waveforms, including: CBOC, QMBOC, CBCS, MCS, TCS, TOC and m-PSK BOC, etc. Among them, QMBOC is an implementation of MBOC modulation. Two BOC subcarriers are placed orthogonally to obtain a signal similar to 4-PSK modulation. Therefore, different from the multilevel real ...
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IPC IPC(8): G01S19/04
Inventor 魏蛟龙唐祖平杨明叶斌周志辉李瑞博刘昊
Owner HUAZHONG UNIV OF SCI & TECH