CN1241880A - Data transmission method and radio system - Google Patents
Data transmission method and radio system Download PDFInfo
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- CN1241880A CN1241880A CN99108955A CN99108955A CN1241880A CN 1241880 A CN1241880 A CN 1241880A CN 99108955 A CN99108955 A CN 99108955A CN 99108955 A CN99108955 A CN 99108955A CN 1241880 A CN1241880 A CN 1241880A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a data transmission method and a radio system, which comprises a plurality of transceivers (100, 108 to 112) that are arranged to intercommunicate by using a plurality of predetermined radio frequency channels, and in which radio system a maximum value is determined for the amount of interference caused to adjacent frequency channels by the transmitter. In the solution in accordance with the invention, for reducing the power consumption of the transmitters, the transceivers of the system are arranged to transmit on different radio frequency channels, using different maximum values of adjacent channel interference.
Description
The present invention relates to radio system, the latter comprises a plurality of transceivers that arrangement utilizes a plurality of predetermined radio frequency channel to communicate with one another.Specifically, the present invention relates to a kind of system, wherein determine the maximum that causes by the transceiver frequency channel the interference volume of side frequency passage.
In radio system, prepare the signal of emission and generally all must modulate, so that on transmission channel, launch.In general, adopt Ditital modulation method, by this needed signal of emission on the frequency channel that is distributed.Often adopt the non-constant Ditital modulation method of its envelope.When adopting such modulator approach, under the situation of transmitter nonlinear, beyond the frequency channel that is allocated for the signal emission, cause to be called as the interference that adjacency channel disturbs.Like this, this interference mainly is because the nonlinear cause of transmitter.Non-linear and the efficient transmitter terminals amplifier of transmitter is closely related.Linear amplifier is little to the interference that the side frequency passage causes, but its efficient is poor.Non-linear bigger amplifier causes bigger interference, and efficient is preferable.
In radio system, generally determine maximum all for the interference volume that causes by transmitter to adjacency channel, its objective is to make adjacency channel not have being used for carrying out telecommunication simultaneously under the undue situation about disturbing.This maximum generally all is definite by simulating in the design phase of system.By simulating traffic carrying capacity and the transmission mistake on the different passages, determine that acceptable disturbs maximum by measuring interchannel interference and causing thus.
In current system, it is identical that the maximum of adjacency channel interference is defined as in whole system.According to simulation, be chosen in the value that provides satisfactory result in the whole system.But this method has several shortcomings.Because whole system adopts an interference value, so should be worth necessary basis to disturbing the most responsive channel selecting.So on all frequency channels, transmitter all must satisfy same requirement.As a result, in practice, must on all frequency channels, adopt linear but inefficient amplifier.This causes some problems, and for example, mobile phone is because inefficient amplifier and power consumption height.
An object of the present invention is to provide a kind of can solution to the problems described above and system.This adopts a kind of transmission method to reach, wherein the transceiver of at least one base station and terminal transceiver utilize a plurality of predetermined radio frequency channel to communicate, and in the method, determine maximum to the interference volume of side frequency passage about causing by the transmitter frequency passage.The invention is characterized at different radio frequency channel and determine different maximums.
The invention still further relates to radio system, it comprises arranges a plurality of transceivers utilize a plurality of predetermined frequency channels to communicate with one another, and in this radio system, determines the maximum to the interference volume of side frequency passage that is caused by transmitter.The transceiver arrangement that the invention is characterized in system utilizes different adjacency channels to disturb maximum to launch on different frequency channels.
The transmitter of described system comprises amplifier, the latter arranges to amplify the signal of preparing emission, and described transmitter comprises control device, is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by the maximum transmission power of controlling described transmitter.
The transmitter of described system comprises amplifier, and the latter arranges to amplify the signal of preparing emission, and described transmitter comprises control device, is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by the linearity of controlling described amplifier.
The transmitter of described system comprises: amplifier, arrange to amplify the signal of preparing emission; With the predistortion device, be used for before the described amplifier predistortion being added on the signal of described preparation emission, and described transmitter comprises control device, is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by changing predistortion.
The transmitter of described system comprises control device, is used for changing by the biasing of controlling described amplifier the linearity of described amplifier.
Described system comprises at least one base station and a plurality of user terminal that is arranged to base station communication.
Described base station is arranged to when set up calling out the peaked information of interference that allows on about the transmitter frequency passage with the described terminal of signaling.
Described base station is arranged to when terminal is logined on network the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
Described base station is arranged to when described terminal is carried out transfer to new frequency channel the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
Described base station is arranged to when network switches the described terminal in back and logins in network, about the peaked information of the interference that allows on each frequency channel with the described terminal of signaling.
Described system comprises the device that is used for the communications traffic load on the monitoring frequency passage and is used for determining that according to described load each frequency channel acceptable disturbs peaked device.
It is to determine in the design phase of described system that each frequency channel acceptable disturbs maximum.
The transceiver of described system is arranged to utilize on the frequency channel on the edge of the frequency range of distributing to described system first adjacency channel of determining to disturb maximum to launch, and utilize second adjacency channel of determining to disturb maximum to launch on the frequency channel at the center of the frequency range of distributing to described system, and these maximums of determining are different.
Change the interference volume that causes by the transmitter frequency passage to the side frequency passage by the maximum that controls transmitter transmitting power.
Change the interference volume that causes by the transmitter frequency passage by controlling transmitter amplifier biasing to the side frequency passage.
Change the interference volume that causes by the transmitter frequency passage to the side frequency passage by the linearity of controlling described maximum transmission power and described amplifier simultaneously.
Before emission, in transmitter, make signal generation predistortion, and control the interference volume that causes by the transmitter frequency passage the side frequency passage by the predistortion that changes transmitter.
Described base station when set up calling out the peaked information of interference that allows on about the transmitter frequency passage with the described terminal of signaling.
Described base station when terminal is logined on network the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
Carry out in the transfer of new frequency channel the peaked information of interference that allows on the frequency channel about described terminal with the described terminal of signaling in described terminal described base station.
The described base station peaked information of interference that handle allows on about each frequency channel when network switches the described terminal in back and login in network is with the described terminal of signaling.
The determined maximum of disturbing about each frequency channel changed in the different moment.
Monitor the traffic carrying capacity on the different frequency passage, and determine the described maximum of frequency channel according to communications traffic load.
It is to determine in the design phase of system that the acceptable of each frequency channel disturbs maximum.
First maximum of determining that frequency channel on the edge of available frequencies scope utilizes adjacency channel to disturb, and second maximum of determining that the frequency channel at the center of described frequency range utilizes adjacency channel to disturb, and these maximums are different.
Method and system of the present invention has several advantages.The present invention is based on such fact, promptly in radio system, the different frequency channel of permissible value of some its interference is arranged all generally.For example, distribute to the frequency channel of outermost of frequency range of a system to the requirement meeting disturbed passage strictness than this scope center.By means of the present invention, can be stricter requiring to be provided with as required for outer tunnel, central passage is then allowed higher adjacency channel disturb.This has an advantage, promptly central passage can utilize non-linear more serious, but the lower amplifier of power consumption on average just.
In most preferred embodiment of the present invention, the jamming margin to the maximum of different frequency channels can be set, in the design phase of system so they have constant fixed value.Jamming margin also can, for example, the modification of related network design and changing.In second most preferred embodiment of the present invention, the jamming margin value can be utilized, and for example, the communications traffic load of network channel is as the criterion of adjusting and dynamically change.
In most preferred embodiment of the present invention, arrange the base station about the peaked information of the interference that allows on the terminal frequency passage with the signaling terminal.Can when setting up calling, send to terminal to information about maximum interference level.This is particularly useful to the embodiment that this value dynamically changes.Another advantage is whenever terminal needn't all be kept at different channel value in the memory.In second most preferred embodiment, when terminal is logined, can send to terminal to information in network about maximum interference level.This is not the situation advantageous particularly that constantly changes to this value.
In most preferred embodiment of the present invention.Maximum power by the restriction transmitter is controlled the interference to adjacency channel that is caused by transmitter.
In second most preferred embodiment of the present invention, control the interference that causes by transmitter to adjacency channel by the linearity of adjusting transmitter by biasing.
In the 3rd most preferred embodiment of the present invention, adopt above-mentioned option simultaneously.
In the 4th most preferred embodiment of the present invention, control the interference that causes by transmitter by the predistortion of transmitter to adjacency channel.
Get in touch the most preferred embodiment ratio below with reference to the accompanying drawings and describe the present invention in greater detail.In the accompanying drawing:
Fig. 1 represents the example according to radio system of the present invention;
Fig. 2 illustrates first example of frequency channel;
Fig. 3 illustrates the example of the frequency channel of a system;
Fig. 4 represents the distribution of cellular radio system medium frequency passage;
Fig. 5 a and 5b illustrate the example of a system frequency passage;
Fig. 6 illustrates the power output as the input power function of an amplifier;
Fig. 7 illustrates an example that reduces interference power;
Fig. 8 illustrates an example according to transmitter architecture of the present invention;
Fig. 9 illustrates the more detailed example of amplifier control;
Figure 10 illustrates second example according to transmitter architecture of the present invention.
Fig. 1 illustrates solution of the present invention can be applied to one of them digital data transmission system.It relates to the part of cellular radio system, and this system comprises base station 100, the latter and user terminal 108 to 112 carry out two-way communication (102 to 106)-.Also communicate by letter with base station controller 114 in the base station, the latter taps into capable relaying to the final link in network other places.The digital data transmission system of demonstration is a kind of cellular radio system, after this will be to be applied to formal description the present invention of cellular radio system, and still for the professional and technical personnel, obviously, the present invention never is limited to this.The present invention also is applicable to other system.
Fig. 2 illustrates a frequency channel of radio system.In the solution of the present invention, frequency channel can or the broadband or the arrowband.Solution of the present invention can be applied to adopt the system of this frequency channel of two types.The present invention preferably is applied to broadband system.In narrowband systems, on a frequency channel, a traffic channel is arranged generally, a plurality of traffic channel can be time-multiplexed on it.On the wideband frequency passage, can transmit a plurality of traffic channel simultaneously,, for example adopt code division multiplexing.Can enumerate and adopt TDMA, that is the GSM of time division multiple access frequency channel (global system for mobile communications), as the example of narrowband systems.Can enumerate and utilize CDMA, that is the system of code division multiple access is as an example of broadband system.Also can combine this two system.How in the traffic carrying capacity of cutting apart between the different user on each frequency channel, this itself unimportant to the present invention.
Fig. 3 illustrates the example of the frequency channel of a system.The particular range 300 of frequency spectrum is distributed to this system.The scope of being distributed comprises a plurality of frequency channels 1,2 ..., N, they are placed adjacent, make that the sideband of side frequency passage is overlapping.In the both sides of the scope of distributing to this system, can there be the frequency range 302,304 of distributing to another system.The sideband 306,308 of this system's outermost passage 1 and N is stretched over the outside of the frequency range of distributing to this system.In order not occur disturbing, allow interference level must determine enough lowly.Adjacent system may have disturbing responsive contact, this a kind of situation will occur, wherein the maximum disturbed of the adjacency channel that whole system is allowed is because the cause of outermost passage and must determine lowly, although the internal channel of system can be controlled with looser value.In solution of the present invention, avoided this shortcoming, because the maximum that adjacency channel disturbs can be determined according to concrete passage.
In most preferred embodiment of the present invention, the maximum that adjacency channel disturbs can be determined at each passage at system design stage.On this stage, can utilize various performance numbers to carry out computer simulation widely as parameter, obtain each passage acceptable numerical value by experiment.In simulation, can consider the passage of related system and the passage of the system that adopts the side frequency passage.Like this, in the simulation of Fig. 3, can determine the restriction to adjacency channel interference stricter to passage 1 and N than other passage.
In second most preferred embodiment of the present invention, dynamically determine the maximum that adjacency channel disturbs for each passage.Communications traffic load on each frequency channel of base station monitoring, and give base station controller with this message transport.According to the communications traffic load on each passage, base station controller can be extrapolated the acceptable interference level of each passage.Traffic carrying capacity is few more on the frequency channel, and the interference of the adjacency channel that it allows is just big more, and correspondingly, when traffic carrying capacity increases, allows interference capability just to reduce.For example, light if system detects in passage 3 and 5 traffic carrying capacitys of Fig. 3, then the transmitter on the passage 4 just can allow to launch with higher adjacency channel interference level.Except that the monitoring communication traffic load, also other suitable criterion is applied to determining of interference level.
In most preferred embodiment of the present invention, there is the possible maximum of the adjacency channel interference of given limited number.The value of each passage is just selected from this number.For example, may have only two possible values, thereby simplicity of design, but, then can obtain maximum benefit if several values is arranged.Typical ACP value used in cellular radio system can be for example, as what adopted in the example of Fig. 3, to be 30dBc at the center of frequency range, and to be 38dBc on passage 1 and N.Nature, these values are just for example.
If the present invention is applied to cellular radio system,, how to give the channel allocation of system the different mesh of system unimportant then from viewpoint of the present invention.Fig. 4 illustrates the distribution at system's medium frequency passage, and this system had both comprised grand mesh, comprises the microgrid hole again.In the figure, trunnion axis 400 is represented frequency, and vertical axis 402 is represented transmitting power.In this system, the grand mesh frequency channel that utilizes higher transmitting power is placed on the center 404 of frequency range, and the microgrid hole frequency channel that utilizes low transmitting power is placed on the edge 406 and 408 of frequency range.In solution of the present invention, the maximum that adjacency channel disturbs can be with such method setting, and the value of promptly grand mesh frequency channel 404 is different from the value of microgrid hole frequency channel 406,408.
Fig. 5 a illustrates another example of a system frequency passage.Frequency spectrum particular range 300 is distributed to this system.The scope of being distributed comprises a plurality of frequency channels 1,2 ..., N, they are adjacent to place, and make that the sideband of adjacency channel is overlapping.This system can have dissimilar frequency channels, such as, the broadband channel of various objectives and narrow channel.In the example of Fig. 5 a, narrow channel 500 is distributed in the center of frequency range.By means of solution of the present invention, can be the adjacency channel interference-limited of frequency channel 2 and 4 at the level lower than frequency range other parts.
Fig. 5 b illustrates the example of the frequency channel of a system.The particular range 300 of frequency spectrum is distributed to this system.The scope of being distributed comprises a plurality of frequency channels 1,2 ..., N, their placed adjacent make that the sideband of adjacency channel is overlapping.The frequency channel that separates 504,506 of this system frequency scope is distributed to different operators.Can pass through the adjacency channel interference-limited of frequency channel 3 and 4 on the level lower, to reduce the interference between the operator than frequency range other parts.
In most preferred embodiment of the present invention, when the present invention was applied to cellular radio system, base station controller was preserved the information of the permission adjacency channel interference level of different frequency passage.The base station arranges the peaked information of disturbing about the adjacency channel that allows on the used frequency channel of this terminal with the described terminal of signaling.Can send information to terminal with diverse ways about maximum interference level.For example, the contact signaling transmits this information when setting up calling.For example, in the radio system based on GSM, this information can be included in the system information of BCCH passage.The base station also can carried out when new frequency channel shifts in this terminal, about the peaked information of the adjacency channel interference that allows on this terminal frequency passage with the described terminal of signaling.When this interference level is when dynamically determining, that is when their often during change, this program particularly suitable.
The peaked information of interference that the base station can also allow on transmitting about each frequency channel when terminal is logined on network.This takes place when connecting the terminal of having closed.The base station can be after network exchange on network during login about the peaked information of the interference that allows on each frequency channel with the described terminal of signaling.When interference level is to determine statically, that is should value determine, and they not when often changing this program particularly suitable at network design phase.At this moment terminal must have enough storage capacitys that the permission power level of different passages is kept in the memory.
Obtain an extra benefit in the base station under the situation of this value notice terminal with signaling: thus, in the system of different operators or country variant, can be used in different values on the different passages, and because the cause of described signaling, terminal has been known described value.If channel value is identical in all systems, then this value just can be stored in the memory of terminal on the fabrication stage, thereby signaling is no longer necessary.
How leak into the quantity of power of adjacency channel in more carefully research can control transmitter below.As mentioned above, power mainly is that the non-linear of terminal amplifier causes beyond being diffused into the passage of requirement.So linearity that approach is a control amplifier of control interference power amount.This can realize by the biasing of adjusting amplifier.Hereinafter will be described in more detail.
Another method is before terminal amplifier the signal of preparing emission to be carried out predistortion, so that predistortion compensation terminal amplifier nonlinearity.Hereinafter also will describe in more detail this.
The 3rd method is to control transmitter maximum transmission power.Fig. 6 represents the amplifier power output as the function of input power.Trunnion axis 600 is represented the power on the amplifier in, and vertical axis 602 is represented the power on the amplifier out.The linear fully desirable amplifier of straight line 604 representatives.Power output directly depends on input power like this.Curve 606 illustrates actual linearity of amplifier.As shown in the figure, at the minimum place of transmitting power, this amplifier still is in linear zone, but non-linear the most serious at the high power levels place, in other words, if transmitting power increases, then non-linear also increase.This is because the cause of amplifier compression.In fact, this means owing under different power levels, utilizing same amplifier, so non-linear thereby interference volume changes.Like this, if the maximum power of restriction transmitter also can reduce non-linearly, the interference power that the result leaks into adjacency channel reduces.For example, if emission stool maximum transmission power reduces 1dB (decibel), relative ACP can improve nearly 3dB.
This is illustrated in Fig. 7, the example of two frequency channels of its expression radio system, and the distribution of transmitter transmitting power on passage.In Fig. 7, trunnion axis 700 is represented frequency, and vertical axis 702 is represented output power of transmitter.The curve 704 on the left side illustrates that transmitter has given maximum power P1 and relative ACP has the situation of set-point A1.As numerical example, P1=24dBm, and A1=35dB.The curve 706 on right side illustrates maximum transmission power and is reduced to the situation of P2 value by the P1 value, makes p1-P2=Δ P.At this moment the numerical value of relative ACP also becomes the A2 value, makes A1＜A2.Numerical example P2=20dBm, that is power reduction Δ P=4dB.At this moment A2 is 41dB, that is ACP has improved 6dB relatively.Thereby the absolute interference level on the adjacency channel improved 4+6dB, that is 10dB.
Then, be used for structure by means of the research of the block diagram of Fig. 8 according to the transmitter of system of the present invention.In most preferred embodiment of the present invention, when the present invention was applied to cellular radio system, transmitter was a user terminal, but according to basic thought of the present invention, this transmitter also can be a base station transmitter.
To transmitter input composite signal 800, it comprises two components, is commonly referred to as I component and Q component.Composite signal at first is input to first amplifying device 802, is input to the control signal 804 from transmitting control set 834 of also having of this device.The operation of control signal 804 control amplifying devices 802, and definite gain level.Signal from first amplifying device is input to digital to analog converter 806, and the signal of preparing emission converts analog form therein to.Analog signal after the conversion is input to first filter 808, and it generally is a low pass filter, eliminates the undesirable component of being introduced by digital to analog converter 806 therein from this signal.
The output signal that the filtered analog signal that still comprises described I and Q component on this stage then is input to IQ modulator 810, the first local oscillators 812 also is input to this modulator.In this modulator, I and Q component mix, and are modulated into intermediate frequency by the signal from local oscillator 812.Signal after the modulation is input to second amplifying device 814, and it is amplified by the mode of stipulating according to the control signal 816 of origin spontaneous emission machine control device 834 therein.Control signal 816 can be by the digital to analog converter (not shown) from control device 834.
At amplifying device 814 outputs, the signal after the amplification further be input to generally be band pass filter, be tuned at second filter 818 on the intermediate frequency.Filter 818 is removed any undesirable signal component of being introduced by the modulator 810 and second amplifying device 816 from signal.The output signal of filter 818 is input to multiplier 820, and this signal multiply by the radio output signal of second local oscillator 822 in multiplier 820.At the output of multiplier 820, the signal of preparing emission is taked the form of radio frequency, and it is input to the 3rd amplifying device 824, and this signal is amplified by the mode of stipulating according to the control signal 826 of origin spontaneous emission machine control device 834 therein.Control signal 824 can be by the digital to analog converter (not shown) from control device 834.The output signal of amplifying device 824 is input to the 3rd filter 828, and it generally is the band pass filter that is tuned on the radio frequency.Filter 828 is removed the undesirable signal component of being introduced by multiplier 820 and the 3rd amplifying device 824 from signal.
The output signal of the 3rd filter 828 is input to terminal amplifier 830, and the latter amplifies the signal of preparing emission.Terminal amplifier can comprise the amplifier of an amplifier or a plurality of series connection.The signal of preparation emission is input to the antenna (not shown) from the output of terminal amplifier by duplexer filter.
In according to transmitter of the present invention, from the control signal 832 incoming terminal amplifiers of transmitting control set 834.At first, this control signal comprises biasing control, and it for example passes through the digital to analog converter (not shown) from control device, and the biasing of control amplifier.Because the control signal cause, the linearity of amplifier can be controlled, thereby caused interference to adjacency channel also can be controlled.
In transmitter of the present invention, the maximum power of transmitter is by controlling by means of control signal 816 and 826 gains of adjusting the second and the 3rd amplifying device 814 and 824.
Transmitting control set 834 can advantageously be realized by means of processor and software of necessity or independent logic element.
Fig. 9 illustrates a more detailed example realizing terminal amplifier biasing control.In the example in the drawings, terminal amplifier is realized with bipolar transistor.The radio frequency signals of preparing emission is in the input 900 of terminal amplifier.This signal is input to the base stage 904 of bipolar transistor by first capacitor 902.This transistorized emitter 906 is connected to earth potential.Operating voltage is transported to transistor collector 908 by first coil 912.Between first coil 912 and transistor collector 908, pass through the output signal 916 of second capacitor, 914 receiving terminal amplifiers.Come out from the output of terminal amplifier, described armed signal is input to the antenna (not shown) by duplexer filter.For the sake of clarity, as those skilled in the art all very clearly, the circuit arrangement that illustrates for example here has been simplified, and for example, has omitted the radio-frequency (RF) impedance matching block.
In according to solution of the present invention, for example, offset signal 918 is input to terminal amplifier from control device by D/A converter, and this signal is directed to transistorized base stage by second coil 920.When bias voltage 918 increased, amplifier became linear, thereby has improved ACP.Correspondingly, under the situation of low bias voltage, amplifier nonlinearity is more serious, and ACP is lower.Pointed as numerical example, typical transistor operating voltage V is 5 volts, if bias voltage is operating voltage half, that is V
BIAS=V/2, then this amplifier is so-called class-a amplifier, that is it is linear as far as possible.
In fact, in transmitter, also can realize described terminal amplifier naturally with the method beyond above-mentioned.
Then the block diagram research by means of Figure 10 is used in according to second kind of the transmitter in the system of the present invention possible structure.This figure illustrates the option of realization particularly, and wherein ACP control is by adding what predistortion realized for before terminal amplifier the signal of preparing emission.The block diagram of Figure 10 is most of similar to Fig. 8, and similarly number refers to corresponding assembly, and only describes the assembly relevant with this option below.
Come out from first amplifying device 802, the signal of preparing emission is input to first switch 1020.This switch has two positions.On a position, switch 1020 is connected to predistortion device 1018 to this signal.On another position, switch 1020 is connected to this signal the bypass path 1024 of avoiding the predistortion device.In predistortion device 1018, on this signal, realize distortion by so-called predistortion coefficient, and this predistortion has compensated non-linear that this signal bears in terminal amplifier 830.So by means of the predistortion device, the linearity of transmitter is just controlled, the adjacency channel interference volume is also controlled as a result.This will be for a more detailed description hereinafter.
The input of second switch 1022 is coupled in the output of predistortion device 1018, is coupled to the bypass path 1024 in addition of this input.The second switch 1022 and the first switch simultaneous operation make that then second switch also is in bypass position if first switch links bypass path 1024 to this signal.Correspondingly, if first switch is connected to predistortion device 1018 with this signal, then second switch also is in the position of predistortion device 1018.The location-controlled of first and second switches is in the control signal 1026,1028 that is provided by control device 834.
In this embodiment, switching device 1000 is followed in the terminal amplifier back on signal path.In switching device 1000, the fraction of transmit signal power is at first got back to second multiplier 1002 by distributor, and this signal multiply by the signal of second local oscillator 822 here.Because multiplied result, this signal becomes intermediate frequency by radio frequency conversion.Intermediate-freuqncy signal is input the 4th amplifying device 1004 further, and this signal here is exaggerated according to the control signal 1006 that is provided by control device 834.
Amplifier output signal is input to the signal of IQ demodulator 1008, the first local oscillators 812 and also imports here.In this demodulator, this signal is demodulated into base band frequency, and it comprises I and Q component.This signal comes out further to be input to the 4th filter 1012 from demodulator, and it is low pass filter preferably, and this filter is removed may be by the undesirable component of second multiplier 1002, the 4th amplifying device 1004 and demodulator 1008 introducings in the signal.Filtered signal is input to analog to digital converter 1014, and the latter becomes digital form to this conversion of signals.Digital signal 1016 from this transducer is input to predistortion device 1018.
According to the ACP value of using on used frequency channel and this passage, transmitting control set 834 can be connected to the predistortion device to signal by means of first and second switches 1020,1022.
Can realize predistortion device 1018 with the known traditional approach of those skilled in the art.Figure 10 illustrates a kind of digital predistortion device, still, also can realize this predistortion device with analog form according to corresponding mode, and this obviously and easily sees those skilled in the art.
Described transmitter solution is an example, and purpose is to illustrate the present invention.As conspicuous to those skilled in the art, in practice, the details of transmitter can change naturally, and this transmitter also can comprise other assembly, for clarity sake, repeats no more here.
Although the present invention describes with reference to the example of accompanying drawing hereinbefore,, obviously, the present invention is not limited to this, it can be in the appended claim book in the scope of invention disclosed thought with various method changes.
Claims (26)
1. radio system, it comprises a plurality of transceivers (100,108 to 112), the latter arranges to utilize a plurality of predetermined frequency channels to communicate with one another, and in described radio system, determine the maximum to the interference volume of side frequency passage that caused by transmitter, it is characterized in that: the transceiver arrangement of described system utilizes different adjacency channels to disturb maximum to launch on different frequency channels.
2. the desired system of claim 1, it is characterized in that: the transmitter of described system comprises amplifier (830), the latter arranges to amplify the signal of preparing emission, and described transmitter comprises control device (834), is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by the maximum transmission power of controlling described transmitter.
3. the desired system of claim 1, it is characterized in that: the transmitter of described system comprises amplifier (830), the latter arranges to amplify the signal of preparing emission, and described transmitter comprises control device (834), is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by the linearity of controlling described amplifier.
4. the desired system of claim 1 is characterized in that:
The transmitter of described system comprises: amplifier (830), arrange to amplify the signal of preparing emission; With predistortion device (1018), be used for predistortion being added on the signal of described preparation emission before the described amplifier, and
Described transmitter comprises control device (834), is used for changing the interference volume to adjacency channel that is caused by the transmitter frequency passage by changing predistortion.
5. the desired system of claim 3, it is characterized in that: the transmitter of described system comprises control device (834), is used for changing by the biasing of controlling described amplifier the linearity of described amplifier.
6. the desired system of claim 1, it is characterized in that: it comprises at least one base station (100) and a plurality of user terminal (108 to 112), and they are arranged and described base station communication.
7. the desired system of claim 6 is characterized in that: described base station (100) are arranged to whenever setting up when calling out the peaked information of interference that allows on about the transmitter frequency passage with the described terminal of signaling.
8. the desired system of claim 6 is characterized in that: described base station (100) are arranged to when terminal is logined on network the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
9. the desired system of claim 6 is characterized in that: described base station (100) are arranged to when described terminal is carried out transfer to new frequency channel the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
10. the desired system of claim 6, it is characterized in that: described base station (100) are arranged to when network switches the described terminal in back and logins in network, about the peaked information of the interference that allows on each frequency channel with the described terminal of signaling.
11. the desired system of claim 1 to 7, it is characterized in that: it comprises the device (100 that is used for the communications traffic load on the monitoring frequency passage, 114) and be used for determining that according to described load each frequency channel acceptable disturbs peaked device (100,114).
12. the desired system of claim 1 to 11 is characterized in that: it is to determine in the design phase of described system that each frequency channel acceptable disturbs maximum.
13. the desired system of claim 1, it is characterized in that: the transceiver of described system is arranged to the frequency channel (406 on the edge of the frequency range of distributing to described system, 408) utilize first adjacency channel of determining to disturb maximum to launch on, and utilize second adjacency channel of determining to disturb maximum to launch on the frequency channel (404) at the center of the frequency range of distributing to described system, and these maximums of determining are different.
14. data transmission method, wherein at least one base station transceiver (100) and terminal transceiver (108 to 112) utilize a plurality of predetermined radio frequency channel to communicate, and in described method, to what cause side frequency passage interference amount is determined a maximum, it is characterized in that: determine different maximums about different frequency channels by the transmitter frequency passage.
15. the desired method of claim 14 is characterized in that: change the described interference volume that causes by described transmitter frequency passage by the described maximum of controlling described transmitter transmitting power to the side frequency passage.
16. the desired method of claim 14 is characterized in that: setover and change the described interference volume that causes by described transmitter frequency passage to the side frequency passage by controlling described transmitter amplifier.
17. the desired method of claim 14 is characterized in that: change the described interference volume that causes by described transmitter frequency passage by the linearity of controlling described maximum transmission power and described amplifier simultaneously to the side frequency passage.
18. the desired method of claim 14, it is characterized in that: before emission, in described transmitter, make described signal generation predistortion, and control the described interference volume that causes by described transmitter frequency passage the side frequency passage by the predistortion that changes described transmitter.
19. the desired method of claim 14 is characterized in that: described base station (100) when set up calling out the peaked information of interference that allows on about the transmitter frequency passage with the described terminal of signaling.
20. the desired method of claim 14 is characterized in that: described base station (100) when terminal is logined on network the peaked information of interference that allows on about each frequency channel with the described terminal of signaling.
21. the desired method of claim 14 is characterized in that: carry out in the transfer of new frequency channel the peaked information of interference that allows on the frequency channel about described terminal with the described terminal of signaling in described terminal described base station (100).
22. the desired method of claim 14 is characterized in that: described base station (100) peaked information of interference that handle allows on about each frequency channel when network switches the described terminal in back and login in described network is with the described terminal of signaling.
23. the desired method of claim 14 to 19 is characterized in that: the determined maximum of disturbing about each frequency channel changed in the different moment.
24. the desired method of claim 23 is characterized in that: monitor the traffic carrying capacity on the different frequency passage, and determine the described maximum of described frequency channel according to described communications traffic load.
25. the desired method of claim 14 to 21 is characterized in that: it is to determine in the design phase of described system that the described acceptable of each frequency channel disturbs maximum.
26. the desired method of claim 14, it is characterized in that: the frequency channel (406 on the edge of available frequencies scope, 408) described first maximum of determining of utilizing adjacency channel to disturb, and described second maximum of determining that the frequency channel at the center of described frequency range (404) utilizes adjacency channel to disturb, and these maximums are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99108955A CN1241880A (en) | 1998-07-01 | 1999-06-30 | Data transmission method and radio system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI981518 | 1998-07-01 | ||
| CN99108955A CN1241880A (en) | 1998-07-01 | 1999-06-30 | Data transmission method and radio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1241880A true CN1241880A (en) | 2000-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99108955A Pending CN1241880A (en) | 1998-07-01 | 1999-06-30 | Data transmission method and radio system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1241880A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307379A (en) * | 2005-01-18 | 2012-01-04 | 夏普株式会社 | Wireless communication apparatus, mobile terminal and wireless communication method |
| CN101388694B (en) * | 2007-07-05 | 2013-07-24 | 三星电子株式会社 | Apparatus and method for determining resources for peer to peer communication in a communication system |
| CN104541534A (en) * | 2012-06-14 | 2015-04-22 | Kddi株式会社 | Radio terminal, base station apparatus, radio communication system, and computer program |
-
1999
- 1999-06-30 CN CN99108955A patent/CN1241880A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307379A (en) * | 2005-01-18 | 2012-01-04 | 夏普株式会社 | Wireless communication apparatus, mobile terminal and wireless communication method |
| CN102307379B (en) * | 2005-01-18 | 2015-06-17 | 夏普株式会社 | Wireless communication apparatus, mobile terminal and wireless communication method |
| CN101388694B (en) * | 2007-07-05 | 2013-07-24 | 三星电子株式会社 | Apparatus and method for determining resources for peer to peer communication in a communication system |
| CN104541534A (en) * | 2012-06-14 | 2015-04-22 | Kddi株式会社 | Radio terminal, base station apparatus, radio communication system, and computer program |
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