CN108306669A - A kind of dual mode satellite call method based on orthogonal frequency division multiplexing - Google Patents
A kind of dual mode satellite call method based on orthogonal frequency division multiplexing Download PDFInfo
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- CN108306669A CN108306669A CN201710018700.7A CN201710018700A CN108306669A CN 108306669 A CN108306669 A CN 108306669A CN 201710018700 A CN201710018700 A CN 201710018700A CN 108306669 A CN108306669 A CN 108306669A
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- division multiplexing
- frequency division
- orthogonal frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The dual mode satellite call method based on orthogonal frequency division multiplexing that the present invention relates to a kind of, signal and detection including any base station in a, search cellular communications network and its signal strength, it such as detects that base station signal and its intensity meet call demand and execute step b, such as can't detect base station signal and execute step c；B, the local cellular communication unit establishes cellular communication link with the base station under the control of pattern switching control unit, realizes voice communication；C, the satellite communication unit establishes the satellite communication link based on OFDM multi-carrier modulating/demodulating pattern with low rail telecommunication satellite under the control of the pattern switching control unit, realizes voice communication.Call method in the present invention can provide the communication effect of better quality and lower call rate by when there is call request, being first detected and connecting the existing cellular communications networks signal of tradition.If being located at " no signal " region, satellite telephony pattern is used instead, ensure that timely call requires.
Description
Technical field
The present invention relates to satellite-based fields of communication technology, and in particular to a kind of bimodulus based on orthogonal frequency division multiplexing is defended
Star call method.
Background technology
The imagination of satellite communication is that British A Se C Clarkes propose earliest, in October, 1945 he《Radio generation
Boundary》One delivered on magazine is entitled《Extraterrestrial relay station》Article in, it is proposed that in stationary orbit place 3 satellites
To realize the imagination of global communication.
Since first satellite goes up to the air, no matter at home or at abroad, satellite communication system is communicating always neck
Irreplaceable important function is played in domain, either marine navigation and communication at sea or disaster occurs and answers
Anxious communication, when the area of not communication overlay or GCF ground communication facility are by destroying, people remain to ensure to believe by satellite
Breath transmits.Exactly because satellite communication has vast potential for future development and great strategic importance, so either application
Or all to satellite communication, more stringent requirements are proposed for technological layer.
Since satellite communication grows up on the basis of space technology and terrestrial microwave trunking traffic technology, by big
The relaying of satellite outside gas-bearing formation realizes telecommunication.The radio wave of its load information will get through the earth's atmosphere, process it is very long away from
Propagated between earth station and satellite, therefore it is affected by various factors, propagation problem influence whether signal quality and
System performance.In addition, the fast offset at receiving terminal relative transmission end, can make centre frequency movement, originally transmitted signal attribute hair
It is raw to change, to be brought a negative impact to wireless signal transmission.
Invention content
The technical problem to be solved by the present invention is to：It is proposed a kind of dual mode satellite call method based on orthogonal frequency division multiplexing.
The technical solution that the present invention proposes to solve above-mentioned technical problem is：A kind of bimodulus based on orthogonal frequency division multiplexing is defended
Star call method, this method are based on local cellular communication unit, satellite communication unit, pattern switching control unit, dial/answer
Operation interface and voice pickup/broadcast unit, including following characteristics step：
A, to be found to be target, by local cellular communication unit search for cellular communications network in any base station signal and detect and
Its signal strength such as detects that base station signal and its intensity meet call demand and execute step b, such as can't detect base station signal and hold
Row step c；
B, the local cellular communication unit establishes cellular communication with the base station under the control of the pattern switching control unit
Link realizes that voice is logical by the operation interface that dials/answer, voice pickup/broadcast unit and the cellular communication link
Words；
C, the satellite communication unit is established with low rail telecommunication satellite based on just under the control of the pattern switching control unit
The satellite communication link for handing over frequency-division multiplex multi-carrier modulating/demodulating pattern, is picked up by dial/answer operation interface, the sound
Take/broadcast unit and the satellite communication link realize voice communication.
Further, the satellite communication link in the step c includes the modulation of transmitting terminal；
Transmitting terminal is in modulation：I, to by the original signal by the bracket operation interface and/or the acquisition of voice pickup unit
Binarization processing is carried out, obtained binary data is subjected to serial to parallel conversion, serial data is converted to N number of parallel data
And distribute to N number of different subchannels；
Ii, N number of plural subsymbol Xk is mapped to by the parallel data in the roads N are encoded；
Iii, Fast Fourier Transform is carried out to the output signal of coding mapping, N number of plural number subsymbol Xk in frequency domain is transformed into
2N real number sample value Xk in time domain adds a cyclic prefix before calculated transformation sample value, one cyclic extensions of formation
Orthogonal frequency division multiplexing information code word；
Iv, the orthogonal frequency division multiplexing information code word is carried out and goes here and there variation, and pass through D/A conversions and low pass filtered in a serial fashion
Baseband signal is exported after wave；
V, by the baseband signal after up-conversion output OFDM signal.
Further, from t=tsThe orthogonal frequency division multiplexing information code word from moment is indicated by following formula：
In formula：
T is the width of orthogonal frequency division multiplexing information code word；
For the carrier frequency of O subcarrier；
To distribute to the data symbol of every sub-channels.
Further, the satellite communication link in the step c includes the demodulation of receiving terminal；
Receiving terminal is integrated in demodulation after being multiplied respectively with the superposed signal received by the separated subcarrier of its self-generating, point
Each circuit-switched data is separated out, then serial data output is obtained through parallel serial conversion, the receiving terminal is carried in i-th son of the docking collection of letters number
Wave number by being integrated in time span T, obtains initial data according to being restoredd i Calculation process be：
。
The beneficial effects of the invention are as follows：
Dual mode satellite call method based on orthogonal frequency division multiplexing in the present invention, by when there is call request, being first detected
And the existing cellular communications networks signal of tradition is connected, and it is conversed by conventional cellular communication if it can establish connection, it can
With the communication effect for providing better quality and lower call rate.If being located at " no signal " region, satellite telephony is used instead
Pattern ensures that timely call requires.
In addition, the present invention has also made improvement to the signal circulation way of conventional satellite communication, using orthogonal frequency division multiplexing
Multi-carrier modulation/demodulation techniques can improve the interference and decaying that signal is subject in the air, and be conducive to utmostly land productivity
With limited communication frequency domain.
Specific implementation mode
The dual mode satellite call method based on orthogonal frequency division multiplexing in the present invention, this method are based on local cellular communication unit
Member, satellite communication unit, pattern switching control unit, dial/answer operation interface and voice pickup/broadcast unit, including with
Lower step：
A, to be found to be target, by local cellular communication unit search for cellular communications network in any base station signal and detect and
Its signal strength such as detects that base station signal and its intensity meet call demand and execute step b, such as can't detect base station signal and hold
Row step c；
B, local cellular communication unit establishes cellular communication link with the base station under the control of pattern switching control unit, passes through
Dial/answer operation interface, voice pickup/broadcast unit and cellular communication link realizes voice communication；
C, satellite communication unit is established with low rail telecommunication satellite and is based on orthogonal frequency division multiplexing under the control of pattern switching control unit
With the satellite communication link of multi-carrier modulation/demodulation modes, by dial/answer operation interface, voice pickup/broadcast unit and
Satellite communication link realizes voice communication.
Voice communication in step c includes the modulation of transmitting terminal；
Transmitting terminal is in modulation：I, to being carried out by the original signal by bracket operation interface and/or the acquisition of voice pickup unit
Binarization is handled, and obtained binary data is carried out serial to parallel conversion, and serial data is converted to N number of parallel data and is divided
The N number of different subchannels of dispensing；
Ii, N number of plural subsymbol Xk is mapped to by the parallel data in the roads N are encoded；
Iii, Fast Fourier Transform is carried out to the output signal of coding mapping, N number of plural number subsymbol Xk in frequency domain is transformed into
2N real number sample value Xk in time domain adds a cyclic prefix before calculated transformation sample value, one cyclic extensions of formation
Orthogonal frequency division multiplexing information code word；
Iv, orthogonal frequency division multiplexing information code word is carried out and goes here and there variation, and in a serial fashion after D/A conversions and low-pass filtering
Export baseband signal；
V, by baseband signal after up-conversion output OFDM signal.
From t=tsOrthogonal frequency division multiplexing information code word from moment is indicated by following formula：
In formula：
T is the width of orthogonal frequency division multiplexing information code word；
For the carrier frequency of O subcarrier；
To distribute to the data symbol of every sub-channels.
In step c, receiving terminal in demodulation, by the separated subcarrier of its self-generating respectively with the superposed signal that receives
It is integrated after multiplication, isolates each circuit-switched data, then serial data output is obtained through parallel serial conversion；
Receiving terminal is restored in i-th subcarrier data of the docking collection of letters number, by being integrated in time span T, is obtained
To initial datad i Calculation process be：
。
The present invention's is not limited to the above embodiment, and the technical solution of above-mentioned each embodiment of the invention can be handed over each other
Fork combination form new technical solution, in addition it is all using equivalent replacement formed technical solution, all fall within the present invention claims guarantor
It protects in range.
Claims (4)
1. a kind of dual mode satellite call method based on orthogonal frequency division multiplexing, this method is based on local cellular communication unit, satellite
Communication unit, pattern switching control unit, dial/answer operation interface and voice pickup/broadcast unit, including following characteristics step
Suddenly：
A, to be found to be target, by local cellular communication unit search for cellular communications network in any base station signal and detect and
Its signal strength such as detects that base station signal and its intensity meet call demand and execute step b, such as can't detect base station signal and hold
Row step c；
B, the local cellular communication unit establishes cellular communication with the base station under the control of the pattern switching control unit
Link realizes that voice is logical by the operation interface that dials/answer, voice pickup/broadcast unit and the cellular communication link
Words；
C, the satellite communication unit is established with low rail telecommunication satellite based on just under the control of the pattern switching control unit
The satellite communication link for handing over frequency-division multiplex multi-carrier modulating/demodulating pattern, is picked up by dial/answer operation interface, the sound
Take/broadcast unit and the satellite communication link realize voice communication.
2. the dual mode satellite call method based on orthogonal frequency division multiplexing according to claim 1, it is characterised in that：The step
Satellite communication link in c includes the modulation of transmitting terminal；
Transmitting terminal is in modulation：I, to by the original signal by the bracket operation interface and/or the acquisition of voice pickup unit
Binarization processing is carried out, obtained binary data is subjected to serial to parallel conversion, serial data is converted to N number of parallel data
And distribute to N number of different subchannels；
Ii, N number of plural subsymbol Xk is mapped to by the parallel data in the roads N are encoded；
Iii, Fast Fourier Transform is carried out to the output signal of coding mapping, N number of plural number subsymbol Xk in frequency domain is transformed into
2N real number sample value Xk in time domain adds a cyclic prefix before calculated transformation sample value, one cyclic extensions of formation
Orthogonal frequency division multiplexing information code word；
Iv, the orthogonal frequency division multiplexing information code word is carried out and goes here and there variation, and pass through D/A conversions and low pass filtered in a serial fashion
Baseband signal is exported after wave；
V, by the baseband signal after up-conversion output OFDM signal.
3. according to the dual mode satellite call method based on orthogonal frequency division multiplexing described in claim 2, which is characterized in that from t=ts
The orthogonal frequency division multiplexing information code word from moment is indicated by following formula：
In formula：
T is the width of orthogonal frequency division multiplexing information code word；
For the carrier frequency of O subcarrier；
To distribute to the data symbol of every sub-channels.
4. according to the dual mode satellite call method based on orthogonal frequency division multiplexing described in claim 3, it is characterised in that：Described
Satellite communication link in step c includes the demodulation of receiving terminal；
Receiving terminal is integrated in demodulation after being multiplied respectively with the superposed signal received by the separated subcarrier of its self-generating, point
Each circuit-switched data is separated out, then serial data output is obtained through parallel serial conversion, the receiving terminal is carried in i-th son of the docking collection of letters number
Wave number by being integrated in time span T, obtains initial data according to being restoredd i Calculation process be：
。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489767A (en) * | 2021-06-30 | 2021-10-08 | 南京中网卫星通信股份有限公司 | Shipborne communication monitoring system |
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| CN113489767A (en) * | 2021-06-30 | 2021-10-08 | 南京中网卫星通信股份有限公司 | Shipborne communication monitoring system |
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