CN101997794A - Method and device for reducing mutual interference of multiple carriers - Google Patents
Method and device for reducing mutual interference of multiple carriers Download PDFInfo
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- CN101997794A CN101997794A CN2009101652425A CN200910165242A CN101997794A CN 101997794 A CN101997794 A CN 101997794A CN 2009101652425 A CN2009101652425 A CN 2009101652425A CN 200910165242 A CN200910165242 A CN 200910165242A CN 101997794 A CN101997794 A CN 101997794A
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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
- H04L27/2626—Arrangements specific to the transmitter only
Abstract
The invention discloses a method for reducing mutual interference of multiple carriers, comprising the following steps: adjusting the phase of the modulated signal; and judging whether the baseband signal can be correctly demodulated, if not, continuously adjusting the phase of the modulated signal, and if so, taking the current modulated signal as the output signal. The invention simultaneously discloses a device for reducing mutual interference of the multiple carriers. The invention especially obviously improves the performance under the condition of adjacent configuration of multiple carriers, ensures that multiple carriers can simultaneously work in the same wireless signal coverage area and greatly improves the frequency spectrum utilization ratio.
Description
Technical field
The present invention relates to the treatment technology of multicarrier phase mutual interference in the communication system, relate in particular to a kind of method and apparatus that reduces the mutual interference of multicarrier phase.
Background technology
The wireless communication system multipotency is supported the multicarrier mode of operation at present, and multi-carrier mode is meant that transmitting and receiving all will be the ripple that closes of a plurality of single carriers.For example for the CDMA2000 1x communication system of 800MHz frequency range, the bandwidth of single carrier is 1.23MHz, the adjacent carrier centre frequency is 1.23MHz at interval, so a plurality of carrier waves for example three carrier wave disposed adjacent the time be exactly three 1.23MHz bandwidth the common about 3.69MHz of occupied bandwidth of composition of single carrier close ripple, the centre frequency of three carrier waves can be set to 871.11MHz respectively, 872.34MHz, 873.57MHz (also can be other frequency).Fig. 1 is code division multiple access (CDMA, Code Division Multiple Access) the carrier-in-interference schematic diagram that three carrier waves that system's frequency domain is adjacent occur, as shown in Figure 1, the frequency of first carrier wave is 871.11MHz among the figure, second carrier frequency point is 872.34MHz, and the frequency of the 3rd carrier wave is 873.57MHz.The partial information that can occur a carrier wave in the multi-carrier mode is aliased in the adjacent carrier wave, the phase mutual interference between multicarrier promptly occurred, and is particularly evident during the carrier wave disposed adjacent.Two shadow regions are the aliasing zone of carrier wave as can see from Figure 1, and promptly the partial information of first carrier wave is aliased in second carrier wave, and the partial information in second carrier wave is aliased in first carrier wave simultaneously.Analogue also appears in second carrier wave and the 3rd carrier wave.In the carrier wave aliasing information of another one carrier wave, this partial information will become a kind of interference and influence quality of signals.Because the existence of this interference can't be done correct demodulation to signal probably at receiving terminal, therefore must reduce the phase mutual interference between this multicarrier, this interference is particularly outstanding to the influence performance of the EV-DO signal in the cdma system.Certainly, in systems such as WCDMA and TD-SCDMA, also there is similar multicarrier interference problem.
In systems such as CDMA, WCDMA and TD-SCDMA,,, must reduce the influence of the phase mutual interference between the multicarrier for the quality that guarantees to communicate by letter when in multicarrier mode of operation following time.The solution of multicarrier phase mutual interference in the present still unmatchful wireless communication system of industry.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and apparatus that reduces the mutual interference of multicarrier phase, can obviously reduce the multicarrier phase mutual interference of adjacent carrier frequency.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that reduces the mutual interference of multicarrier phase is characterized in that, comprising:
Adjust the phase place of modulation back signal; And
Whether judgement can correctly demodulate described baseband signal from the signal of described modulation back, can not correctly separate timing, continues to adjust the phase place of described modulation back signal, can correctly separate timing, with signal after the current modulation as output signal.
Preferably, adjust the phase place of modulation back signal, be specially: the phase place to signal after the modulation of each carrier wave is adjusted simultaneously.
Preferably, adjust the phase place of modulation back signal, be specially: signal after the modulation of each carrier wave is adjusted successively.
Preferably, when the modulation system of described modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, step by step the phase place of pairing modulation back signal is adjusted, when signal can correctly demodulate described baseband signal after the modulation of one-level output to the last, signal was as output signal after the modulation that modulation at different levels is determined.
Preferably, the phase place of described modulation back signal comprises the initial phase of signal after the carrier frequency of described modulation back signal, the described modulation.
Preferably, the phase place of described adjustment modulation back signal is to adjust the initial phase of described modulation back signal.
A kind of device that reduces the mutual interference of multicarrier phase comprises:
Adjustment unit is used to adjust the phase place of modulating the back signal;
Demodulating unit is used for described modulation back signal is carried out demodulation;
Judging unit is used to judge whether described demodulating unit can correctly demodulate described baseband signal, can not correctly separate timing, triggers the phase place that described adjustment unit continues to adjust described modulation back signal, can correctly separate timing, triggers determining unit; And
Determining unit, be used for signal after the current modulation as the modulation of described baseband signal after signal.
Preferably, described adjustment unit to the modulation of each carrier wave after the phase place of signal adjust simultaneously.
Preferably, described adjustment unit to the modulation of each carrier wave after signal adjust successively.
Preferably, when the modulation system of described modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, described adjustment unit is adjusted the phase place of pairing modulation back signal step by step, when signal can correctly demodulate described baseband signal after described judging unit is determined the modulation of afterbody output, signal was as output signal after the modulation that described determining unit is determined modulation at different levels.
Preferably, the phase place of described modulation back signal comprises the initial phase of signal after the carrier frequency of described modulation back signal, the described modulation.
Preferably, described adjustment unit is adjusted the initial phase of described modulation back signal.
By above technical scheme, the present invention has realized following beneficial effect: can solve the mutual interference problem of multi-carrier signal in the wireless communication system preferably, especially for the phase mutual interference between the multi-carrier EV-DO signal in the cdma system.Particularly evident to the improvement of performance under multicarrier disposed adjacent situation.Make same wireless signal overlay area can have multicarrier to work simultaneously like this, improved the availability of frequency spectrum greatly, improve the flexibility of wireless planning, improve volume of business, transmission rate and the service quality of sub-district, improved user experience.
Description of drawings
Fig. 1 is the carrier-in-interference schematic diagram that three adjacent carrier waves of cdma system frequency domain occur;
Fig. 2 is to single-carrier modulated mode schematic diagram in the wireless communication system;
Fig. 3 reduces the flow chart of the method for multicarrier phase mutual interference for the present invention;
Fig. 4 selects the structural representation of parameter devices for the present invention;
Fig. 5 selects parameter devices for utilization of the present invention and adjusts the structural representation of modulation signal;
The structural representation that disturbs processing unit falls in Fig. 6 when modulating for carrier wave of the present invention is multistage;
Fig. 7 reduces the composition structural representation of the device of multicarrier phase mutual interference for the present invention.
Embodiment
Basic thought of the present invention is: in multicarrier system, particularly between the multicarrier that frequency domain is adjacent, can there be the phase mutual interference in intercarrier.The present invention by the modulation of adjusting each carrier wave after the phase place of signal, make Interference Control between the multicarrier in the level that can correctly demodulate the useful signal in the modulation signal.Because the phase place of modulation back signal is relevant with the carrier frequency and the initial phase of carrier wave, and the carrier frequency of carrier wave is planned by communication system substantially, belong to nonadjustable parameter, therefore, the present invention mainly reduces interference between the multicarrier by the adjustment of initial phase of modulating the back signal.The present invention program realizes simple and practical.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Transmitting in the modern wireless communication systems realizes message transmission by information is modulated on the transferred signal, wherein, transferred signal can be produced by devices such as numerically-controlled oscillator (NCO, Numerical Control Oscillator) or simulative generators.Modulated process can be finished by polytype modulators such as modulator such as real number modulator, complex modulator or quadrature modulators.
The parameter of reflection modulation back characteristics of signals has a lot, and frequency and phase place are wherein two.For example, transferred signal modulation back signal C (t) can be expressed as: C (t)=A (t) * cos (2 π ft+ θ)+j * A (t) * sin (2 π ft+ θ).Wherein A (t) is an amplitude, be and time t and the relevant variable of baseband signal, f is a carrier frequency, θ is the initial phase of modulation back signal, and (2 π ft+ θ) is the phase place of modulation back signal, and it is the function of a frequency f, time t and initial phase θ, unified among the present invention with W (t, f θ) represents, abbreviates W as.If real modulation only needs to use the real part among the C (t).
Only the frequency of transferred signal is made appointment in traditional multi-carrier wireless communications system, and do not reach the purpose that reduces inter-carrier interference by the phase place W that modulates the back signal is made special appointment.
And the phase place W of transferred signal modulation back signal is a frequency f, the function of time t and initial phase θ, and wherein t is the variable quantity in a moment, has represented the characteristic of signal, and is uncontrollable.F and θ are two controlled variablees, can reach the purpose of regulating modulation back signal phase W by changing wherein any one or changing two variablees simultaneously.In wireless communication system, the carrier position of launching there is strict requirement, thereby a little less than the deviation range relative narrower flexibility of f, and initial phase θ has bigger adjustable range and flexibility.Technical scheme of the present invention proposes at these characteristics just.
Below further illustrate this point by accompanying drawing.
Fig. 2 be in the wireless communication system to single-carrier modulated mode schematic diagram, as shown in Figure 2, comprise among the figure that two parts are modulator 200 and transferred signal generator 201.Modulator 200 is used for input signal x is modulated to and obtains output signal y on the transferred signal, and modulator 200 is real modulation device, plural debugger or quadrature modulators etc. commonly used in the wireless communication system.Transferred signal generator 201 is generations of finishing transferred signal according to input parameter.Two input parameters have only been provided among the figure, frequency input parameter f and phase place output parameter θ.The present invention reaches the problem of disturbing between each carrier wave of reduction to the initial phase adjustment of output signal y just.
Fig. 3 as shown in Figure 3, in step 301, is provided with the input parameter that selects parameter devices for the present invention reduces the flow chart of the method for multicarrier phase mutual interference, and these parameters can comprise the information parameter of expression input signal (modulation signal or baseband signal).In step 302, the output signal (modulation back signal) of communication system is carried out demodulation, can correctly demodulate baseband signal as the foundation of selecting modulation back signal.In step 304, judge current modulation according to the signal demodulation result that obtains in the step 302 after signal (output signal) whether reach requirement.In step 303, according to above-mentioned demodulation result (in the time of can not correctly demodulating baseband signal), calculate the initial phase that next group is modulated the back signal, as the new initial phase of each modulation back signal according to optimized Algorithm.Repeating step 301,302,303 and 304 up to finding one group of initial phase of modulating the back signal to make output signal can correctly demodulate baseband signal.In step 305, the initial phase that finally obtains is solidified, as sets of signals after the modulation of initial phase that some customized configurations adopt.
The schematic diagram that selects parameter devices that Fig. 4 proposes for the present invention, as shown in Figure 4, the parameter devices of selecting of the present invention is selected the software group by signal extraction hardware and phase place.Signal extraction hardware can be custom-designed circuit, also can be special-purpose or general instrument.It can be to operate in the software among the CPU or operate in the software in the programmable logic device or all comprise that phase place is selected software, and this software also can solidify and operation with the form of hardware.The several input parameters that select parameter devices when work to need of the present invention comprise: the type parameter n of input signal, the signal number m of input signal, the positional information k of input signal.According to different systems or carrier case, can only use input parameter partly or completely in actual the use.The output parameter of parameter devices that selects of the present invention comprises that the initial phase of modulation back signal selects the parameter result indicative signal.Result indicative signal has represented to select an operating state of parameter devices, and done state is still just in running status.The parameter devices of selecting of the present invention is carried out work according to the parameter mode that selects among Fig. 3, both can use before system's operation, also can use in system's running.The parameter devices main application of selecting of the present invention is the initial phase that generates each modulation back signal, and outputs in each modulation back signal, and making the initial phase of each modulation back signal is that initial phase is exported with the initial phase place value of selecting parameter devices output.
Fig. 5 selects parameter devices for utilization of the present invention and adjusts the structural representation of modulation signal, and as shown in Figure 5, the modulator group can be the various modulator type that adopt in the wireless communication system, and its function is to finish the modulation of multicarrier.The modulator group has two input signals, and one is that the carrier signal of importing is modulation signal X1...Xm, and another one is the transferred signal 1..m of transferred signal generator group output.Wave multiplexer is used for m single carrier after the modulation closed ripple.Coupler is used for output signal is fed back to the parameter devices of selecting of the present invention, and as an input parameter that selects parameter devices, together with other input parameter, the present invention selects parameter devices to carry out choosing of initial phase parameter according to certain optimized Algorithm.At last the initial phase that chooses is set in each modulation back signal.Select the function of parameter devices to select parameter devices identical with shown in Figure 4.Need to prove, the present invention also comprises modulating the demodulator (not shown) of back signal demodulation, can will be input in the demodulator behind the signal multiplexing after the modulation of output, the demodulation result of demodulator is input to of the present invention the choosing in the parameter devices, as the foundation of the initial phase that whether continues to adjust modulation back signal.Demodulator selects for use existing demodulator to get final product.
Below be example with the cdma system of three carrier waves, in conjunction with method shown in Figure 3, further illustrating technical solution of the present invention is essence.
Fig. 3 reduces the flow chart of the method for multicarrier phase mutual interference for the present invention, and as shown in Figure 3, the method that the present invention reduces the mutual interference of multicarrier phase may further comprise the steps:
Step 301: input parameter is provided with.Input parameter comprises the relevant parameter of representing input signal.For example: the type of incoming carrier is CDMA 1X signal in this example; The incoming carrier number is three carrier waves in this example; The incoming carrier positional information is 871.11MHz, 872.34MHz, the 873.57MHz that disposed adjacent is set in this example; The initial phase parameter of input modulation back signal, in this example the initial phase of modulation back signal will by one at random the function of serial generator obtain, and beginning the generator seed all is set to 0 in the first time.Three carrier phase initial values that obtain by seed 0 are as input parameter.
The present invention demodulates the baseband signal of modulating in the signal of back by demodulating equipment is set, compare with pre-configured baseband signal, if it is identical then think that each modulation back interference between signals meets communicating requirement, otherwise do not meet communicating requirement, continue to adjust the initial phase place value of each modulation back signal, up to correctly demodulating baseband signal.This demodulating equipment can realize by hardware or software, can be existing any demodulator or the software realized by demodulating algorithm.
Step 302: the baseband signal in the signal of demodulation modulation back.The process of signal demodulation is the inverse process of signal modulation, promptly determines the channel of modulation back signal by channel estimating etc., demodulates baseband signal again.
Step 303: the foundation that the comparative result of the baseband signal that demodulates in the step 302 and pre-configured baseband signal is selected as modulation back signal phase.If the baseband signal that demodulates is identical with pre-configured baseband signal, then withdraw from phase place and adjust flow process, enter into step 305, otherwise enter into step 304: adjust stepping amount (adjustment amount), and return the initial phase that step 301 is further adjusted modulation back signal.
The adjustment algorithm of modulation back signal initial phase is a constantly process of circulation, withdraws from circulation up to the baseband signal that the demodulates Shi Caihui that meets the demands.Below describe initial phase adjustment process of the present invention in detail.
At first provide from big to small numbering from big to small successively according to the frequency parameter of modulation back signal.As in this example-the 1.23MHz correspondence be numbered 1, the 0MHz correspondence be numbered 2, the 1.23MHz correspondence be numbered 3; Modulation back signal phase is provided with the height of priority and will determines according to the numbering of modulation back signal.If disposed adjacent, it is minimum to number minimum priority so, and the highest priority of numbering is taken second place, and the priority of other numbering is arranged from big to small according to the size order of numbering.If carrier wave is non-disposed adjacent, modulation back signal numbering is priority so, and big more priority is high more.After finishing, setting will obtain priority and the corresponding one by one and array that arrange from high to low of modulation back signal numbering.This example at be the continuous situation of carrier frequency of carrier wave, so the signal corresponding priorities is after the modulation of each numbering: what number 1 correspondence is 1, and what number 2 correspondences is 3, and what number 3 correspondences is 2.The big more priority of priority numeral is high more.
When initial phase is adjusted, the stepping amount (adjustment amount) of each adjustment need be set, the coarse adjustment stepping amount of setting of the present invention is 20 °, progressively dwindles the stepping amount in the time of can not meeting the demands, till determining suitable initial phase.
Being 20 ° with the stepping amount is how example explanation the present invention realizes what the initial phase of carrier wave was adjusted.Change initial phase (the being 0 ° of beginning generally) value of carrier wave 1,2,3 respectively with initial phase, note, here the initial phase of carrier wave changes, be not that to be that the initial phase of three carrier waves changes identical, when adjusting the carrier wave initial phase, the phase place between three carrier waves is can not be identical at every turn, if the initial phase of three carrier waves is identical all the time, the initial phase that is equivalent to three carrier waves is always 0 °, and the disturbed condition between it will be identical all the time, and this phase place adjustment is nonsensical.The present invention promptly is a situation of determining the interference minimum between each phase value (integral multiple with the stepping amount is an increment) of each carrier wave correspondence each phase value (integral multiple with the stepping amount is an increment) corresponding with other carrier waves, and will disturb each minimum carrier wave (modulation back signal) as signal after the modulation of baseband signal.
As previously mentioned, the change value of each carrier wave initial phase can realize by the aforesaid parameter devices of selecting, as long as set corresponding carrier wave increase and decrease sign (integral multiple with aforesaid stepping amount is an increment) for each carrier wave, as long as the disturbed condition between the initial phase place values all between each carrier wave is determined by the program of setting.
When the stepping amount is 20 °, when can not determine out the baseband signal of correct each carrier wave of demodulation simultaneously between each carrier wave, adjust the stepping amount, for example be adjusted into 10 °, when determining respectively between each carrier wave to occur by aforementioned manner once more with various initial phases, signal was as output signal after can the disturbed condition between each carrier wave (make each carrier wave all can demodulate baseband signal), each modulation back signal all can correctly demodulate the modulation of baseband signal.If still can not determine out signal after the modulation of baseband signal of each carrier wave when being 20 °, then further adjust the stepping amount, for example be adjusted into 5 ° or 1 ° etc., still the initial phase of each carrier wave is adjusted by aforementioned manner, thus determine each carrier wave can the modulation of correct demodulated base band signal after signal.
Need to prove, the initial phase of each above-mentioned carrier wave can be the mode of adjusting simultaneously, the initial phase that is each carrier wave changes (initial phase of each carrier wave can simultaneously not identical) simultaneously, thereby determines signal after the modulation that each carrier wave all can correctly demodulate baseband signal.Also can adjust successively the initial phase of each carrier wave, promptly at first change the initial phase of one of them or plural carrier wave, make the initial phase of at least one carrier wave wherein constant, thereby determine signal after the modulation that each carrier wave all can correctly demodulate baseband signal.No matter how the adjustment mode of initial phase is, determine that the mode of modulation back signal but is identical.
Need to prove, the present invention is equally applicable to the situation that three above carrier waves are adjusted, concrete, set the stepping amount that the carrier wave initial phase is adjusted respectively by aforesaid mode, each carrier wave is in the disturbed condition of various initial phases (integral multiple with the stepping amount is an increment) by set stepping amount, signal after determining the modulation that each carrier wave all can correctly demodulate baseband signal is as the output signal of each carrier wave.
Step 305: solidify the initial phase of carrier wave, be about to the modulation of current definite initial phase place value after signal determine as output signal.
Fig. 6 falls the structural representation that disturbs processing unit when modulating for carrier wave of the present invention is multistage, as shown in Figure 6, is the applicable cases of m carrier wave n level modulation.The function of the modulator group among the figure, transferred signal generator group, wave multiplexer and coupler and each device shown in Figure 5 is identical, and modulator groups at different levels are used for the modulation signal of correspondence is modulated to transferred signal.In multistage when modulation, can be optionally adjusted the initial phase of signal after one-level or the multistage modulation.The present invention to the modulation in multistage when modulation after the adjustment of signal initial phase describe.On the whole, the realization means of the initial phase adjustment of signal and the signal initial phase adjustment of single-stage modulation back are identical after modulation during multistage the modulation, be to judge whether signal can correctly demodulate baseband signal after the modulation of last output to determine whether adjustment finishes during multistage modulation that different is, after signal after the modulation of last output can correctly demodulate baseband signal, at different levelsly determine that modulation back signal is promptly as output signal at different levels.Among the present invention, also comprise demodulator (not shown) to signal demodulation after the modulation of afterbody output, can will be input to behind the signal multiplexing after the modulation of afterbody output in the corresponding demodulator, the demodulation result of demodulator is input to of the present invention the choosing in the parameter devices, as the foundation of the initial phase that whether continues to adjust modulation back signal.Demodulator selects for use existing demodulator to get final product.
When the modulation system of modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, step by step the initial phase of pairing modulation back signal is adjusted, mode and the aforementioned mode shown in Figure 3 adjusted are basic identical, it is the criterion difference, when signal can correctly demodulate baseband signal after the modulation of one-level output to the last, signal was as output signals at different levels after the modulation that modulation at different levels is determined.
The technical scheme that the present invention put down in writing is suitable for dissimilar multicarriers equally and is in the multicarrier mode of operation, as the mixed configuration of carrier wave EV-DO signal in the cdma system and carrier wave 1X signal.
For the interference problem between each carrier wave in the different communication systems, the initial phase adjustment stepping amount of carrier wave still is set respectively by aforesaid mode, and when each modulation back signal is in various phase places (integral multiple with the stepping amount is an increment), whether each modulation back signal all can correctly demodulate baseband signal, and signal was as output signal after each modulation back signal all can correctly demodulate the modulation of baseband signal.Initial phase between the different communication systems is adjusted carrier wave initial phase and the indifference in mode and the homologous ray, and standard remains each carrier wave all can correctly demodulate baseband signal.
The technical scheme that the present invention put down in writing is fit to the wireless communication system of other standard equally, Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Access) system and TD SDMA (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) system.
Fig. 7 reduces the composition structural representation of the device of multicarrier phase mutual interference for the present invention, as shown in Figure 7, the device that the present invention reduces the mutual interference of multicarrier phase comprises adjustment unit 70, demodulating unit 71, judging unit 72 and determining unit 73, wherein, adjustment unit 70 is used to adjust the phase place of modulation back signal; Demodulating unit 71 is used for carrying out demodulation to modulating the back signal; Judging unit 72 is used to judge whether demodulating unit 70 can correctly demodulate described baseband signal, can not correctly separate timing, triggers the phase place that adjustment unit 70 continues to adjust described modulation back signal, can correctly separate timing, triggers determining unit 73; Determining unit 73 is used for signal after the current modulation as output signal.The phase place of signal is adjusted simultaneously after the modulation of 70 pairs of each carrier waves of adjustment unit.Signal is adjusted successively after the modulation of 70 pairs of each carrier waves of adjustment unit.The phase place of modulation back signal comprises the initial phase of signal after the carrier frequency of described modulation back signal, the described modulation.Adjustment unit 70 is adjusted the initial phase of described modulation back signal.
When the modulation system of modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, adjustment unit 70 is adjusted the phase place of pairing modulation back signal step by step, when signal can correctly demodulate described baseband signal after judging unit 72 is determined the modulation of afterbodies output, signal was as output signal after the modulation that determining unit 73 is determined modulation at different levels.
Those skilled in the art are to be understood that, the device of the reduction multicarrier phase mutual interference that the present invention is shown in Figure 7 is to design for the method that realizes the mutual interference of aforementioned reduction multicarrier phase, the realization function of the each processing unit in the device shown in Figure 7 can be understood with reference to the associated description in the method for aforementioned reduction multicarrier phase mutual interference, the function of each unit can realize by the program that runs on the processor, also can realize by corresponding logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (12)
1. a method that reduces the mutual interference of multicarrier phase is characterized in that, comprising:
Adjust the phase place of modulation back signal; And
Whether judgement can correctly demodulate described baseband signal from the signal of described modulation back, can not correctly separate timing, continues to adjust the phase place of described modulation back signal, can correctly separate timing, with signal after the current modulation as output signal.
2. method according to claim 1 is characterized in that, adjusts the phase place of modulation back signal, and be specially: the phase place to signal after the modulation of each carrier wave is adjusted simultaneously.
3. method according to claim 1 is characterized in that, adjusts the phase place of modulation back signal, is specially: signal after the modulation of each carrier wave is adjusted successively.
4. method according to claim 1, it is characterized in that, when the modulation system of described modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, step by step the phase place of pairing modulation back signal is adjusted, when signal can correctly demodulate described baseband signal after the modulation of one-level output to the last, signal was as output signal after the modulation that modulation at different levels is determined.
5. according to each described method in the claim 1 to 4, it is characterized in that the phase place of described modulation back signal comprises the initial phase of signal after the carrier frequency of described modulation back signal, the described modulation.
6. method according to claim 4 is characterized in that, the phase place of described adjustment modulation back signal is to adjust the initial phase of described modulation back signal.
7. a device that reduces the mutual interference of multicarrier phase is characterized in that, comprising:
Adjustment unit is used to adjust the phase place of modulating the back signal;
Demodulating unit is used for described modulation back signal is carried out demodulation;
Judging unit is used to judge whether described demodulating unit can correctly demodulate described baseband signal, can not correctly separate timing, triggers the phase place that described adjustment unit continues to adjust described modulation back signal, can correctly separate timing, triggers determining unit; And
Determining unit, be used for signal after the current modulation as the modulation of described baseband signal after signal.
8. device according to claim 7 is characterized in that, described adjustment unit to the modulation of each carrier wave after the phase place of signal adjust simultaneously.
9. device according to claim 7 is characterized in that, described adjustment unit to the modulation of each carrier wave after signal adjust successively.
10. device according to claim 7, it is characterized in that, when the modulation system of described modulation signal is the cascade modulation, from the corresponding modulation signal of first order modulation, described adjustment unit is adjusted the phase place of pairing modulation back signal step by step, when signal can correctly demodulate described baseband signal after described judging unit is determined the modulation of afterbody output, signal was as output signal after the modulation that described determining unit is determined modulation at different levels.
11., it is characterized in that the phase place of described modulation back signal comprises the initial phase of signal after the carrier frequency of described modulation back signal, the described modulation according to each described device in the claim 7 to 10.
12. device according to claim 11 is characterized in that, described adjustment unit is adjusted the initial phase of described modulation back signal.
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| CN200910165242.5A CN101997794B (en) | 2009-08-08 | 2009-08-08 | Method and device for reducing mutual interference of multiple carriers |
| PCT/CN2009/075911 WO2011017885A1 (en) | 2009-08-08 | 2009-12-23 | Method and apparatus for reducing mutual interference of multi-carrier |
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| CN100576768C (en) * | 2007-02-14 | 2009-12-30 | 哈尔滨工业大学 | The compensation method of Doppler frequency shift in the MPSK mobile communication system |
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2009
- 2009-08-08 CN CN200910165242.5A patent/CN101997794B/en not_active Expired - Fee Related
- 2009-12-23 WO PCT/CN2009/075911 patent/WO2011017885A1/en active Application Filing
Patent Citations (6)
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| CN1296684A (en) * | 1998-02-12 | 2001-05-23 | 金吉斯通讯公司 | Multiple access method and system |
| CN1514555A (en) * | 2002-12-31 | 2004-07-21 | �����ʩ���عɷݹ�˾ | Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine |
| US20040146122A1 (en) * | 2003-01-27 | 2004-07-29 | Fague Daniel E. | Method and apparatus for frequency offset compensation |
| JP2005192000A (en) * | 2003-12-26 | 2005-07-14 | Toshiba Corp | Multicarrier communication system, and transmitter, receiver, transmission method, and reception method used for same system |
| CN101185269A (en) * | 2005-05-30 | 2008-05-21 | 松下电器产业株式会社 | Wireless communication base station apparatus and wireless communication method in multicarrier communication |
| CN101361307A (en) * | 2006-01-06 | 2009-02-04 | 松下电器产业株式会社 | Wireless communication device |
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| Publication number | Publication date |
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| CN101997794B (en) | 2015-01-28 |
| WO2011017885A1 (en) | 2011-02-17 |
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