CN101998594A - 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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- CN101998594A CN101998594A CN200910165243XA CN200910165243A CN101998594A CN 101998594 A CN101998594 A CN 101998594A CN 200910165243X A CN200910165243X A CN 200910165243XA CN 200910165243 A CN200910165243 A CN 200910165243A CN 101998594 A CN101998594 A CN 101998594A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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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 comparing the performance index of the modulated signal with the set performance index, continuously adjusting the phase of the modulated signal if the set performance index can not be satisfied, and taking the current modulated signal as the output signal if the set performance index is satisfied. 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 CDMA20001x 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, CodeDivision 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 the receiving terminal receiver, this interference is particularly outstanding to the influence performance of the EV-DO signal in the cdma system.
In the multi-carrier wireless communications system, for the quality that guarantees to communicate by letter, especially multi-carrier EV-DO communication pattern in the cdma system must reduce the influence of the phase mutual interference between the carrier wave.The present solution of the multicarrier phase mutual interference of multi-carrier EV-DO disposed adjacent in the cdma system especially in the 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 comprises:
Adjust the phase place of modulation back signal; And
The performance index of modulation back signal are compared with the performance index of setting, can not satisfy when setting performance index, continue to adjust the phase place of described modulation back signal, when satisfying the setting performance index, 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, the performance index of signal satisfy when setting performance index after the modulation of one-level output to the last, and signal is 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.
Preferably, described performance index comprise the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power and at least one among the waveform quality Rho.
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;
The performance index determining unit is used for determining described performance index of modulating the back signal;
Comparing unit, be used for the performance index of described modulation back signal and the performance index of setting are compared, can not satisfy when setting performance index, trigger the phase place that described adjustment unit continues to adjust described modulation back signal, satisfy when setting performance index, trigger determining unit; And
Determining unit is used for signal after the current modulation as output 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, the performance index of signal satisfy when setting performance index after described comparing unit is determined the modulation of afterbody output, and signal is 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.
Preferably, described performance index comprise the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power and at least one among the waveform quality Rho.
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 is the schematic diagram of the modulation system of multicarrier of 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 the performance index of each modulation back signal satisfy the performance index of setting.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 ControlOscillator) 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, 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 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 adjusting 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 adjusting 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.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 reduces the flow chart of the method for multicarrier phase mutual interference for the present invention, as shown in Figure 3, in step 301, the input parameter that selects parameter devices is set, these parameters can comprise the information parameter of expression input signal (modulation signal or baseband signal) and the parameter of output signal performance index.In step 302, extract the output signal (modulation back signal) of communication system, determine its performance index, as the foundation of selecting modulation back signal.In step 304, judge current modulation according to the gap between the signal performance index of signal performance index that obtains in the step 302 and setting after signal (output signal) whether reach requirement.In step 303, the signal performance index according to aforementioned calculation obtains calculates the initial phase that next group is modulated the back signal according to optimized Algorithm, as the new initial phase of each modulation back signal.Repeating step 301,302,303 and 304 up to finding one group of initial phase of modulating the back signal to make the performance index of output signal meet the demands.In step 305, the initial phase that finally obtains is solidified, as initial phase that some customized configurations adopt modulation back sets of signals.
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.
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 and the parameter of output signal performance index.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 carrier wave 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.In this example the initial phase of modulation back carrier wave 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; Input is to the requirement of (the modulation back signal) performance index that transmit, this example at be the 1X signal, the index of weighing the 1X signal has: the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power, standard-required is-27dBc; Waveform quality Rho, standard-required 0.912.
Step 302: determine the performance index that transmit.The mode of determining the performance index that transmit can be to extract three corresponding after initial phase place is set up carrier performance indexs by general measuring instrument, i.e. each value of the MAX IT of each carrier wave and Rho.Also can calculate the performance index that transmit by corresponding Survey Software.
Step 303: the performance index that obtain in the step 302 and the performance index of setting are compared, draw corresponding difference, select the foundation of phase place as modulation back signal.The performance index of (modulation back signal) satisfy the performance index requirement of setting if transmit, 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 modulated back signal.
The adjustment algorithm of modulation back signal initial phase is a constantly process of circulation, and the baseband signal that demodulates up to the receiver Shi Caihui that meets the demands withdraws from circulation.
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 ,-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 intercarrier is a 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.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.Each numbering corresponding priorities is in this example: 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 numeral is high more.
Among the present invention, the stepping amount is to be divided into two grades according to calculating the difference amount of each carrier performance index with the requirement of setting performance index in the step 303: big stepping and little stepping.If a difference that obtains performance index in the step 303 is greater than 0.6, adopt bigger stepping to adjust initial phase so, use 50 ° in this example, if obtain difference in the step 303 less than 0.6, adopt the less mode of stepping to adjust phase place so, adopt 20 ° of steppings in this example.After finishing, the setting of stepping amount just can obtain after the modulation signal numbering and stepping amount array one to one.The setting of stepping amount will dynamically be changed according to the size of performance difference.
After obtaining priority and stepping amount, according to priority and stepping amount the initial phase of each modulation back signal is adjusted, up to the performance index that obtain corresponding carrier wave is that optimum will stop to adjust, here Zui You judgment basis is that phase place increases and reduces and all can cause this carrier performance to worsen, so this time correspondence carrier performance be optimum.Finish to obtain one group after the modulation of all phase places and make the more excellent relatively phase-group of each carrier wave (signal after the modulation of output) performance, and be referred to as the first round and adjust and obtain phase-group.Only check at every turn in the first round whether each carrier performance is more excellent relatively for stopping foundation, owing to influencing each other between the phase modulation, so the phase place that the first round obtains not necessarily makes each carrier performance can both satisfy standard-required.The phase-group that obtains after adopting the first round to adjust is united and is checked whether each carrier wave can both meet the demands, and satisfies and withdraws from, and does not satisfy and then carries out the next round adjustment.
Second takes turns the performance index that first round adjustment gained phase place at first are set when adjusting and extract each carrier wave, calculate and the modulation of current best initial phase after the difference between the performance index of transmitting of signal, according to the size of difference second priority of taking turns each carrier wave of phase modulation is set, the big more priority of difference is high more.Second takes turns in the adjustment and unifiedly to adopt more small step to advance to adjust as 10 °.Every performance index of extracting corresponding phase-modulated carrier after phase place that are provided with calculate whether improvement is arranged, if there is improvement to continue this carrier wave adjustment so, if do not have improvement then stop this carrier wave adjustment and carry out the adjustment of next carrier wave.So repeat to finish the phase place of all carrier waves, and claim this to take turns to adjust the phase-group obtain and be referred to as second and take turns phase-group up to adjustment.
Second takes turns the phase-group that obtains after the adjustment unites to check whether each carrier wave can both meet the demands, and satisfies and withdraws from, and does not satisfy and then carries out the next round adjustment.The front two-wheeled adopts the mode of big stepping coarse adjustment to obtain the only relative one group of optimum phase-group of each carrier performance with the mode that accurate adjustment is advanced in small step respectively.To observe all carrier performance after each adjustment is finished once in the ensuing adjustment whether improvement will be arranged, have only the performance of all carrier waves all to have improvement just to upgrade the phase place of corresponding carrier wave, otherwise do not upgrade, and constantly upgrade priority according to the difference size, constantly according to as 1 ° come progressively reduce the stepping amount, and whether each the setting finish the performance of all calculating each carrier wave after the phase place and meet the demands, and the back that meets the demands is released, if do not satisfy then continue poll.When being polled to the phase step input and being set to 0, showing based on the initial phase that uses seed complete 0 to produce based on randomizer for the first time in step 401 to find the suitable phase-group of a combination to make carrier performance meet the demands, must upgrade one group of new randomizer seed this time, repeat the initial phase adjustment process of said method next time.Except the first time randomizer seed be an initial value beginning to provide for as be 0 in this example, other the time seed renewal that when always adopting phase step in circulation last time to enter still not obtain reasonable phase place at 0 o'clock organize phase place as new seed.
What circulate in the manner described above searches, but avoid to certain situation still can not find after repeatedly the seed of randomizer upgrades the situation of appropriate phase, prevent to adjust and enter into an endless loop, thereby in once searching, be necessary the maximum times that the regulation seed upgrades, be set in this example 20 times, if surpass 20 times, will withdraw from current phase place adjustment, and inform that this time search failure.Again carry out the initial phase adjustment after waiting for a period of time, till finding suitable initial phase for each carrier wave.
In the phase place adjustment mode of signal, first round adjustment mode is the mode of successively initial phase of modulating the back signal being adjusted after the above-mentioned modulation, and the mode that the second rotation perfect square formula is adjusted simultaneously for the initial phase of each modulation back signal.
Step 305: solidify the initial phase of modulation back signal, be about to the current modulation of satisfying performance index after signal be defined 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 satisfies the performance index of setting after the modulation of last output to determine whether adjustment finishes during multistage modulation that different is, after the performance index that signal after the modulation of last output satisfy to be set, at different levelsly determine to modulate afterwards signal promptly as output signal at different levels.
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, the performance index of signal satisfy when setting performance index after the modulation of one-level output to the last, and signal is as output signals at different levels after the modulation that modulation at different levels is determined.
For the adjustment of the initial phase of the three carrier wave EV-DO signals of doing disposed adjacent in the cdma system, the mode that contrasts aforementioned three carrier wave 1X signal phase adjustment is identical, and not existing together exactly, the performance index that transmit of input require different in step 401.The index of weighing the EV-DO signal has: the waveform quality Rho1 of pilot channel correspondence, the waveform quality Rho2 of MAC channel correspondence, the waveform quality Rho3 of DATA channel correspondence, the MAX IT1 of pilot channel correspondence, the MAX IT2 of MAC channel correspondence, the MAX IT3 of DATA channel correspondence.
In addition, the present invention is equally applicable to do in the cdma system situation of the mixed configuration of two carrier wave EV-DO signals of disposed adjacent and 1 carrier wave 1X signal, with the difference of aforementioned adjustment mode be: in step 301, will import the performance index of requirement of the carrier wave of 1X and EV-DO simultaneously, in step 303, also need the configuration of priority is changed slightly.In the mixed configuration pattern, at first EV-DO signal and 1X signal to be distinguished respectively, be divided into two pure EV-DO and pure 1X sets of signals.Two groups of signals are provided with the priority of phase modulation respectively according to mode in the foregoing example, the principle that will always be higher than 1X priority after finishing according to the priority of EV-DO are set carry out the adjustment of initial phase modulating the back signal.If for example in this example after the modulation of 1X signal the frequency parameter of signal be 1.23MHz, two other EV-DO is respectively 0MHz ,-1.23MHz provides being numbered of its correspondence and 1,2,3 obtains corresponding priorities according to top description and be: 1,2,3.
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.For the wireless communication systems of other standard, only need change the performance index parameter of signal correspondence according to the standard-required of different systems, other steps will be identical.
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, performance index determining unit 71, comparing unit 72 and determining unit 73, wherein, adjustment unit 70 is used to adjust the phase place of modulation back signal; Performance index determining unit 71 is used for determining the performance index of described modulation back signal; Comparing unit 72 is used for the performance index of modulation back signal and the performance index of setting are compared, can not satisfy when setting performance index, trigger the phase place that adjustment unit 70 continues to adjust described modulation back signal, satisfy when setting performance index, trigger 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.Described performance index comprise the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power and at least one among the waveform quality Rho.
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, the performance index of signal satisfy when setting performance index after comparing unit 72 is determined the modulation of afterbodies output, and signal is 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 (14)
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
The performance index of modulation back signal are compared with the performance index of setting, can not satisfy when setting performance index, continue to adjust the phase place of described modulation back signal, when satisfying the setting performance index, 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, the performance index of signal satisfy when setting performance index after the modulation of one-level output to the last, and signal is 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 5 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. method according to claim 5 is characterized in that, described performance index comprise the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power and at least one among the waveform quality Rho.
8. 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;
The performance index determining unit is used for determining described performance index of modulating the back signal;
Comparing unit, be used for the performance index of described modulation back signal and the performance index of setting are compared, can not satisfy when setting performance index, trigger the phase place that described adjustment unit continues to adjust described modulation back signal, satisfy when setting performance index, trigger determining unit; And
Determining unit is used for signal after the current modulation as output signal.
9. device according to claim 8 is characterized in that, described adjustment unit to the modulation of each carrier wave after the phase place of signal adjust simultaneously.
10. device according to claim 8 is characterized in that, described adjustment unit to the modulation of each carrier wave after signal adjust successively.
11. device according to claim 8, 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, the performance index of signal satisfy when setting performance index after described comparing unit is determined the modulation of afterbody output, and signal is as output signal after the modulation that described determining unit is determined modulation at different levels.
12. each described device in 11 is characterized in that according to Claim 8, 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.
13. device according to claim 12 is characterized in that, described adjustment unit is adjusted the initial phase of described modulation back signal.
14. device according to claim 12 is characterized in that, described performance index comprise the ratio MAX IT of non-activated code channel maximum power of carrier wave and activated code channel gross power and at least one among the waveform quality Rho.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910165243.XA CN101998594B (en) | 2009-08-08 | 2009-08-08 | Method and device for reducing mutual interference of multiple carriers |
| PCT/CN2009/075914 WO2011017887A1 (en) | 2009-08-08 | 2009-12-23 | Method and device for reducing mutual interference between multi-carriers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910165243.XA CN101998594B (en) | 2009-08-08 | 2009-08-08 | Method and device for reducing mutual interference of multiple carriers |
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| US5955992A (en) * | 1998-02-12 | 1999-09-21 | Shattil; Steve J. | Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter |
| JP3640185B2 (en) * | 2002-02-13 | 2005-04-20 | 日本電気株式会社 | Inter-subcarrier interference reduction method for multi-carrier communication system and receiver using the same |
| CN1290280C (en) * | 2002-12-31 | 2006-12-13 | 上海贝尔阿尔卡特股份有限公司 | Method of self eliminating interference between self adaptive carriers and receiving and transmitting machine |
| JP3933628B2 (en) * | 2003-12-26 | 2007-06-20 | 株式会社東芝 | Multi-carrier communication system and transmission apparatus, reception apparatus, transmission method, and reception method used in this system |
| JP4907524B2 (en) * | 2005-05-30 | 2012-03-28 | パナソニック株式会社 | Radio communication base station apparatus and radio communication method in multi-carrier communication |
| US8090034B2 (en) * | 2005-06-22 | 2012-01-03 | Panasonic Corporation | Transmission apparatus and a reception apparatus in a multicarrier transmission system and a transmission method and a reception method using the multicarrier transmission system |
| CN101350646B (en) * | 2007-07-20 | 2012-12-19 | 中兴通讯股份有限公司 | Apparatus and method for reducing peak power of intelligent antenna system |
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| CN101998594B (en) | 2014-04-30 |
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