CN103944844A - Method for fusing beacon signal and data signal - Google Patents
Method for fusing beacon signal and data signal Download PDFInfo
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- CN103944844A CN103944844A CN201410150362.9A CN201410150362A CN103944844A CN 103944844 A CN103944844 A CN 103944844A CN 201410150362 A CN201410150362 A CN 201410150362A CN 103944844 A CN103944844 A CN 103944844A
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Abstract
The invention discloses a method for fusing a beacon signal and a data signal. The QPSK modulation mode is adopted, the data signal occupies I2 QPSK symbols in a branch I, the beacon signal occupies I1 QPSK symbols in a spreading code data mode, and the sending sequence of a branch Q is the same as that of the branch I. The transmission rate of the system is improved while the high-quality beacon signal needed for tracking an antenna is achieved with the low clink power dip and the low spectrum efficiency dip.
Description
Technical field
The present invention relates to the data transmission method in digital communication system data link, particularly a kind of data transmission method that adopts time division way.
Background technology
In communication system, common Air-ground data link route beacon signal and data-signal form jointly, and beacon signal is as the marking head of information, and for track and localization, data-signal is the real effectively information of transmission.
Conventionally its synthesis mode is also divided into frequency division, code point two forms.For frequency division synthesis mode, because beacon signal and data-signal are frequency division multiple address signal (two carrier signal), the back-off of the power amplifier of making a start is larger, and the operating efficiency of power amplifier is not high; On the other hand, for narrowband beacon signal, because its power spectral density is higher, its carrier aircraft is easy to be positioned.Divide synthesis mode for code, beacon signal occupies a branch road Q, and data-signal occupies another branch road I, and with the synthetic road signal of QPSK aspect, two paths of signals is parallel transmission continuously, and data length is identical.The signal power that the party's rule data link system can lose nearly 3dB, system spectrum utilance declines nearly 50%.If adopt time-division synthesis mode, take into account the two shortcoming, so seldom adopt time-division synthesis mode in the time of transfer of data.
Summary of the invention
For the deficiencies in the prior art, goal of the invention of the present invention is to provide a kind of new beacon signal and data-signal to merge, by beacon signal and data-signal are analyzed, complete the fusion method in time division way situation, decline and availability of frequency spectrum decline with less link power, when having met the required high-quality beacon signal of tracking antenna, realize the raising of system transmission rate.
Goal of the invention of the present invention is achieved through the following technical solutions:
The method that beacon signal and data-signal merge, adopts QPSK modulation system, in branch road I, takies I2 QPSK symbol by data-signal, and beacon signal takies I1 QPSK symbol with the form of spreading code data, and it is identical with I road that branch road Q sends sequence.
Compared with prior art, beneficial effect of the present invention is to decline and availability of frequency spectrum decline with less link power, when having met the required high-quality beacon signal of tracking antenna, has realized the raising of system transmission rate.Respond well, be worthy to be popularized.
Brief description of the drawings
Fig. 1 is the building form figure of the method for a kind of beacon signal of the present invention and data-signal fusion.
Specific implementation method
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the present invention adopts time division way, and beacon signal and data-signal are fused into a road signal, and data-signal takies I2 QPSK symbol, beacon signal takies I1 QPSK symbol (little m sequence) with the form of spreading code data, and every frame length is I1+I2 symbol.Q road transmission sequence is identical with I road, and wherein I1 is identical with Q1 length, and I2 is identical with Q2 length.The processing gain of spreading code is 10lgI1, link power decline 10lg (I1/ (I1+I2)), system spectrum utilance decline I2/ (I1+I2).
For example: select I1=204, I2=4128, I1+I2=4332, the processing gain 23dB of spreading code, link power decline 0.2dB, system spectrum utilance declines nearly 4.7%, decline and availability of frequency spectrum decline with less link power, met and followed the tracks of required high-quality beacon signal.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (1)
1. the method that a beacon signal and data-signal merge, adopt QPSK modulation system, it is characterized in that taking I2 QPSK symbol by data-signal in branch road I, beacon signal takies I1 QPSK symbol with the form of spreading code data, and it is identical with I road that branch road Q sends sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410150362.9A CN103944844A (en) | 2014-04-15 | 2014-04-15 | Method for fusing beacon signal and data signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410150362.9A CN103944844A (en) | 2014-04-15 | 2014-04-15 | Method for fusing beacon signal and data signal |
Publications (1)
| Publication Number | Publication Date |
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| CN103944844A true CN103944844A (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410150362.9A Pending CN103944844A (en) | 2014-04-15 | 2014-04-15 | Method for fusing beacon signal and data signal |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098555A (en) * | 2007-06-12 | 2008-01-02 | 浙江大学 | Multi-mode self-adaptive direct-sequence communications system and method therefor |
| CN102710281A (en) * | 2012-06-18 | 2012-10-03 | 中国电子科技集团公司第十研究所 | Direct sequence spread spectrum method for continuous phase modulation |
| WO2012139458A1 (en) * | 2011-04-15 | 2012-10-18 | 华中科技大学 | Method for modulating navigation signal |
| CN102857254A (en) * | 2012-09-21 | 2013-01-02 | 中国航空无线电电子研究所 | Frequency hopping communication system and base band achieving method thereof |
-
2014
- 2014-04-15 CN CN201410150362.9A patent/CN103944844A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098555A (en) * | 2007-06-12 | 2008-01-02 | 浙江大学 | Multi-mode self-adaptive direct-sequence communications system and method therefor |
| WO2012139458A1 (en) * | 2011-04-15 | 2012-10-18 | 华中科技大学 | Method for modulating navigation signal |
| CN102710281A (en) * | 2012-06-18 | 2012-10-03 | 中国电子科技集团公司第十研究所 | Direct sequence spread spectrum method for continuous phase modulation |
| CN102857254A (en) * | 2012-09-21 | 2013-01-02 | 中国航空无线电电子研究所 | Frequency hopping communication system and base band achieving method thereof |
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Application publication date: 20140723 |