CN101584122A - System for wireless communication - Google Patents
System for wireless communication Download PDFInfo
- Publication number
- CN101584122A CN101584122A CNA2006800565496A CN200680056549A CN101584122A CN 101584122 A CN101584122 A CN 101584122A CN A2006800565496 A CNA2006800565496 A CN A2006800565496A CN 200680056549 A CN200680056549 A CN 200680056549A CN 101584122 A CN101584122 A CN 101584122A
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- China
- Prior art keywords
- frequency
- signal
- modulation spectrum
- modulation
- transmission
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
- H03D3/002—Modifications of demodulators to reduce interference by undesired signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/12—Frequency diversity
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention relates to a system for wireless communication having a transmission unit and at least one reception unit, characterized in that the transmission unit S uses a transmission carrier frequency Flo to transmit a modulated signal which contains not only a modulation spectrum MS but also its mirror band SB, and the reception unit contains means AE in order to take prescribed criteria as abasis for selecting and demodulating either the modulation spectrum MS or its mirror band SB. This makes it possible to attain the advantage that the transmission certainty can be significantly incre ased in comparison with the situation in which only a modulation spectrum is transmitted, since interfering influences on the transmission path from the transmission unit to a reception unit only rarely affect both the frequency ranges of the modulation spectrum and those of its mirror band.
Description
Technical field
The present invention relates to a kind of system that is used for radio communication, have transmitter unit and at least one receiving element.
Background technology
In wireless communication technology,, therefore developed the method that is used to improve transmission reliability often owing to a lot of effects produce interference.
Wherein a kind of method, promptly so-called " frequency diversity method " send with different frequencies by with same information of same the time and have improved transmission reliability.In this effect of having utilized different frequency ranges to provide different transmission characteristic and interference signal not to relate to the frequency of all employings usually.Receiver can be chosen in and produce the frequency of favourable reception condition on the position of this receiver respectively thus.
This but " frequency diversity method " is very bothersome, because must comprise a plurality of complete emitters that quantitatively equal the quantity of the different frequency that adopted according to the reflector of prior art.In addition, receiving system also must comprise the device that can receive all frequencies that adopted, to determine best respectively frequency thus.
A key concept in radio communication is exactly so-called modulation.Modulation should be understood to information is imprinted on the carrier signal, and this carrier signal for example also can be that frequency is 0 the signal that waits.Be called baseband modulation in this case.But usually this modulation is used for the signal through ovennodulation is moved on to another frequency band, and transmission characteristic and specific (special) requirements are complementary.Be called bandpass modulation in this case.At this, this information is transmitted by carrier characteristics such as amplitude and/or phase place.Thus can be with other, especially higher frequency range is used for wireless transmission.Known multiple modulator approach is as frequency modulation(FM), phase modulated, Modulation and Amplitude Modulation and all be respectively other favourable method for oneself application a lot.
Modulation and Amplitude Modulation is the simplest and is one of the most frequently used modulator approach.Through amplitude-modulated signal is that carrier signal by useful signal and general higher frequency multiplies each other and forms.Final carrier frequency position (Frequenzlage) often reaches by intermediate steps, and this modulation at first is to print on the intermediate frequency with fixed frequency in this case, and is converted to final frequency location in next step.
Frequency spectrum through amplitude-modulated signal is made up of carrier signal and two so-called sidebands, and these two sidebands comprise the identical information content, i.e. the information content of useful signal.If this modulation at first is printed on the intermediate frequency carrier, then form two frequency bands around this intermediate frequency carrier, promptly go up sideband and following sideband.By further with local oscillator signals-so-called transmission carrier wave-multiply each other, obtain final transmission signals.This transmission signals comprises the modulation spectrum on both sides and this modulation spectrum mirror image band in another frequency side separately of local oscillator.This mirror image band is suppressed usually in actual applications, because this mirror image band comprises the information identical with modulation spectrum and departs from by corresponding regulation frequency range given in advance in a lot of the application.The circuit that need take a lot of trouble for the mirror image band that suppresses not expect is as filter in the transmitter unit or I/Q modulator.
The application of said method is not limited to Modulation and Amplitude Modulation certainly.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of system, can communicate with one or more receiving elements and transmission reliability can improve by this system's transmitter unit.
At this, the expense of parts should keep seldom.
This technical problem solves by a kind of system that is used for radio communication according to the present invention, this system has transmitter unit and at least one receiving element, wherein this transmitter unit is with the signal of transmit frequency through ovennodulation, this signal also comprises the mirror image band of this modulation spectrum except modulation spectrum, and receiving element comprises the device that is used for selecting according to preassigned the mirror image band of the mirror image band of modulation spectrum or this modulation spectrum and this modulation spectrum of demodulation or this modulation spectrum.
Utilize the present invention can realize the characteristic of 2 frequency diversities transmission with very little expense.This very tip aspect parts also causes the protection of very high failure safe, very little space requirement and very little electric current demand.
Because the signal by the transmitter unit emission also comprises corresponding image frequency except two sidebands, therefore can remove filter or the I/Q modulator that for example is provided with in conventional radiating circuit.Except these reduce cost and the effect of complexity, information is also transmitted in two frequency bands simultaneously, has realized inherent frequency diversity thus.
Another advantageous feature of this solution is, carrier signal is inhibited, and whole power of being launched thus are directed in the sideband and mirror image band thereof that comprises information.
Advantageously, as being used to select the quality of reception of the preassigned employing of one of sideband through the signal of demodulation.Transmission reliability can be brought up to extra high degree thus.
Favourable also has, as the error rate of quality of reception employing by the digital signal of described system transmissions.This error rate can obtain by simple mode, and the reliable conclusion about the characteristic of transmission channel is provided.
Recommendable is to be provided with for transmission " industry, science, medical treatment " used free and open frequency band.This ISM frequency band is free and open to be used to the public, and can be because of this use the generation expense.This use in case of necessity is limited to specific application.Advantage of the present invention is outstanding especially in the application of a large amount of transmitter units of needs, especially under the situation with 2.4Giga hertz and 5.6Giga hertz ISM frequency band transmission sensor signal.
Favourable also have, and adopts M-ary FSK (Multiple Frequencyshift Keying, Multiple Frequency Shift Keying) method as modulator approach, because also keep the complexity of receiving element very little in the modulator approach that keeps robust thus.Especially the application that has a binary FSK method of big stroke (mitgrossem Hub) causes the realization advantage in the receiving element.
Another is particularly advantageous to be applied in the scope of near-field communication and to provide, because in the low frequency ranges that is provided with for near-field communication, the filter according to the prior art setting in the transmitter unit is bothersome especially, but can remove this filter according to the present invention.
Description of drawings
Exemplarily:
Fig. 1 illustrates the typical frequency spectrum of signal in the modulation of two sidebands.
Fig. 2 illustrates the function connection layout of transmitter unit of the present invention.
Fig. 3 illustrates the connection block diagram of system of the present invention.
Fig. 4 illustrates the function connection layout of receiving element of the present invention.
Fig. 5 illustrates the function connection layout of the execution mode of transmitter unit.
Embodiment
The frequency spectrum of signal shown in Figure 1, this frequency spectrum is made up of sideband USB and the OSB under intercarrier signal Ft and two.Sort signal typically is used for the modulation of two sidebands.Trunnion axis is represented frequency f, and vertical axis is represented signal level Sig.
In system of the present invention, sort signal is as with intercarrier signal Ft modulation signal Fmod being carried out the result of first modulation and forming.Can suppress intercarrier signal Ft or sideband USB, OSB, but this is unimportant to the present invention.
The frequency spectrum that Fig. 2 illustrates the function connection layout of transmitter unit S and produces is respectively wherein launched the mirror image band SB of modulation spectrum MS and this modulation spectrum MS according to the present invention.Modulating frequency Fmod is modulated on the intermediate frequency carrier Ft by the first modulating stage M1.At the frequency spectrum Sig1 of this formation corresponding to the frequency spectrum shown in Fig. 1.Undertaken and the multiplying each other of transmission carrier wave Flo by another modulating stage M2, this signal is brought into the transmission frequency position of expectation thus, wherein keeps modulation spectrum MS and affiliated mirror image band SB.By using multiplication, suppressed transmission carrier wave Flo.Fig. 2 also comprises negative spectrum component, and this negative spectrum component only forms applied modulator approach and produces the such conclusion of real signal.The signal of exporting at the output of the second modulating stage M2 is Sig2.
Fig. 3 is exemplary and schematically show the structured flowchart of the present invention conversion.Transmitter unit S emission has the signal Sig2 of frequency spectrum shown in Figure 2, and this signal Sig2 is received by receiving element E.The signal Sig2 demodulation of this receiving element E to receiving, and the signal after the demodulation offered analyze decision unit AE.Analyze decision unit AE and from the signal Sig2 that receives, determine the quality of reception, and select FA receiving element E to be switched to the mirror image band SB that receives modulation band MS or modulation band MS by frequency by criterion.This for example can be achieved like this, and promptly frequency selects FA to select between two frequencies consistent with mirror image band frequency coordination and that produce by quartz, and these frequencies offer receiver E as intermediate frequency and use.In addition, frequency selects FA for example to control PLL (phase-locked loop), to produce two essential frequencies thus.
If the frequency band that proof is switched to is so favourable not as the initial frequency band that uses, then analyze the frequency band that decision unit AE switches back to initial use again.What guarantee to select thus is that the frequency band of favourable transmission performance is provided respectively.
Switch to the standard that modulation spectrum MS still switches to the mirror image band SB of modulation spectrum MS as being used to, can adopt measurement parameter different, that determine according to the signal that receives.For example, can determine the incoming level of the mirror image band SB of the incoming level of modulation spectrum MS or this modulation spectrum MS, therefrom to obtain to be used for switching to respectively the standard of another frequency band.
Particularly advantageously be, digital signal is by described system transmissions, and this digital signal comprises control information, and this control information makes can determine and analyze signal quality numerical value such as bit error rate or packet error probability.These signal quality numerical value are used as the basis of selecting modulating frequency MS or selecting the mirror image band SB of modulating frequency MS.
Fig. 4 illustrates the function connection layout of exemplary receiving element E, replacement or come signal demodulation by the first frequency, demodulation frequency Flo1 or by the second frequency, demodulation frequency Flo2 to receiving.Selection to frequency, demodulation frequency to be used is undertaken by analyzing decision unit AE, and this analysis decision unit AE carries out this selection according to certain criteria.
Fig. 5 illustrates the function connection layout of the favourable execution mode of transmitter unit S, utilizes this execution mode to be transformed into the frequency shift keying method.It is in the transmitting of numeral in this case equally that two frequency generators such as quartz (controlled) oscillator Qo1, Qo2 or ceramic resonator etc. alternately are modulated to by signal shaping level SF and frequency divider FT by the modulation signal Fmod that is numeral in this case respectively, that these two frequency generators have respectively is seldom different, with the frequency of the frequency spectrum coupling that transmits of expectation.When the high-frequency I SM frequency band that described system is used for as transmission channel, can remove frequency divider and/or signal shaping level.XOR gate X can also be replaced by multiplier.
Reference numerals list
The S transmitter unit
The E receiving element
Sideband under the USB
The upper sideband of OSB
AE analyzes decision unit
The FA frequency is selected
The Sig signal strength signal intensity
The f frequency
The Fmod modulation signal
Flo transmits carrier wave
Flo1 frequency, demodulation frequency 1
Flo2 frequency, demodulation frequency 2
The Ft intercarrier signal
The MS modulation spectrum
SB mirror image band
The FT frequency divider
QO1 first quartz (controlled) oscillator
QO2 second quartz (controlled) oscillator
SF signal shaping level
The FT frequency divider
The X XOR gate
Claims (6)
1. system that is used for radio communication, this system has transmitter unit and at least one receiving element, it is characterized in that, this transmitter unit S is with the signal of transmission carrier frequency Flo emission through ovennodulation, this signal also comprises the mirror image band SB of this modulation spectrum except modulation spectrum MS, and receiving element comprises the device AE that is used for selecting according to preassigned the mirror image band SB of the mirror image band SB of modulation spectrum MS or this modulation spectrum and demodulation this modulation spectrum MS or this modulation spectrum.
2. method according to claim 1 is characterized in that, adopts the quality of reception through the signal of demodulation as the preassigned of the mirror image band SB that is used to select modulation spectrum MS or this modulation spectrum.
3. method according to claim 1 is characterized in that, as the error rate of quality of reception employing by the digital signal of described system transmissions.
4. according to each described method in the claim 1 to 3, it is characterized in that, adopt as frequency band " industry, science, medical treatment " used free and open frequency band.
5. according to each described method in the claim 1 to 4, it is characterized in that, adopt M-ary FSK (Frequency shift Keying) method as modulator approach.
6. according to each described method in the claim 1 to 5, it is characterized in that described transmission is undertaken by the device of near-field communication.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2006/069434 WO2008067851A1 (en) | 2006-12-07 | 2006-12-07 | System for wireless communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101584122A true CN101584122A (en) | 2009-11-18 |
Family
ID=38357989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800565496A Pending CN101584122A (en) | 2006-12-07 | 2006-12-07 | System for wireless communication |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2097987A1 (en) |
| CN (1) | CN101584122A (en) |
| WO (1) | WO2008067851A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5008939A (en) * | 1989-07-28 | 1991-04-16 | Bose Corporation | AM noise reducing |
| EP1758046A1 (en) * | 2000-06-12 | 2007-02-28 | BTG International Limited | Sideband diversity reader for electronic identification system |
| GB2397973A (en) * | 2003-01-30 | 2004-08-04 | Radiodetection Ltd | Comparing sideband signal quality metrics |
-
2006
- 2006-12-07 EP EP06819923A patent/EP2097987A1/en not_active Withdrawn
- 2006-12-07 WO PCT/EP2006/069434 patent/WO2008067851A1/en active Application Filing
- 2006-12-07 CN CNA2006800565496A patent/CN101584122A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008067851A1 (en) | 2008-06-12 |
| EP2097987A1 (en) | 2009-09-09 |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20091118 |