CN101998592B - 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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- CN101998592B CN101998592B CN200910165240.6A CN200910165240A CN101998592B CN 101998592 B CN101998592 B CN 101998592B CN 200910165240 A CN200910165240 A CN 200910165240A CN 101998592 B CN101998592 B CN 101998592B
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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
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Abstract
The invention discloses a method for reducing mutual interference of multiple carriers, comprising the following steps: adjusting the phase of the modulated signal; modulating the baseband signal to 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 modulated signal of the baseband 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 communication system, relate in particular to a kind of method and apparatus that reduces the mutual interference of multicarrier phase.
Background technology
Wireless communication system multipotency is supported multicarrier mode of operation at present, and multi-carrier mode refers to and transmits and receives all by the ripple that closes that is a plurality of single carriers.The CDMA2000lx communication system for 800MHz frequency range for example, the bandwidth of single carrier is 1.23MHz, adjacent carrier centre frequency interval 1.23MHz, so a plurality of carrier waves when three carrier wave disposed adjacent be exactly for example 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 respectively 871.11MHz, 872.34MHz, 873.57MHz (can be also 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 frequency domain is adjacent occur, as shown in Figure 1, in figure, the frequency of first carrier wave is 871.11MHz, second carrier frequency point is 872.34MHz, and the frequency of the 3rd carrier wave is 873.57MHz.In multi-carrier mode, there will be the partial information of a carrier wave to be aliased in adjacent carrier wave, occurred the phase mutual interference between multicarrier, particularly evident during carrier wave disposed adjacent.Two shadow regions are the aliasing region of carrier wave as can see from Figure 1, and 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.Also there is analogue in second carrier wave and the 3rd carrier wave.In a carrier wave aliasing information of another one carrier wave, will become a kind of interference of this partial information and affect the quality of signal.Due to the existence of this interference, at receiving terminal receiver, probably cannot do correct demodulation to signal, this interference is particularly outstanding on the impact performance of the EV-DO signal in cdma system.
In multi-carrier wireless communications system, for multi-carrier EV-DO communication pattern in the quality, the especially cdma system that guarantee to communicate by letter, must reduce the impact of the phase mutual interference between carrier wave.At present industry there is no the solution of the multicarrier phase mutual interference of multi-carrier EV-DO disposed adjacent in cdma system especially in wireless communication system.
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 method that reduces the mutual interference of multicarrier phase, is characterized in that, comprising:
Adjust the phase place of transferred signal;
Baseband signal is modulated on described transferred signal; And
The performance index of signal and the performance index of setting after modulation are compared, can not meet while setting performance index, continue to adjust the phase place of described transferred signal, meet while setting performance index the transferred signal using current transferred signal as described baseband signal.
Preferably, adjust the phase place of transferred signal, be specially: the phase place to the transferred signal of each carrier wave is adjusted simultaneously.
Preferably, adjust the phase place of transferred signal, be specially: the transferred signal to each carrier wave is adjusted successively.
Preferably, when the modulation system of described baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, step by step the phase place of corresponding transferred signal is adjusted, when the performance index of the modulation signal of to the last one-level output reach the performance index of setting, the transferred signal that modulation at different levels are determined is as the transferred signal of described baseband signal.
Preferably, the phase place of described transferred signal comprises the carrier frequency of described transferred signal, the initial phase of described transferred signal.
Preferably, the phase place of described adjustment transferred signal is to adjust the initial phase of described transferred signal.
Preferably, described performance index comprise the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power and at least one in waveform quality Rho.
A device that reduces the mutual interference of multicarrier phase, comprising:
Adjustment unit, for adjusting the phase place of transferred signal;
Modulating unit, for being modulated to baseband signal described transferred signal;
Performance index determining unit, for determining the performance index of the rear signal of described modulating unit modulation;
Comparing unit, for the performance index of signal and the performance index of setting after modulation are compared, can not meet while setting performance index, triggers the phase place that described adjustment unit continues to adjust described transferred signal, meets while setting performance index, triggers determining unit; And
Determining unit, for the transferred signal using current transferred signal as described baseband signal.
Preferably, described adjustment unit is adjusted the phase place of the transferred signal of each carrier wave simultaneously.
Preferably, described adjustment unit is adjusted successively to the transferred signal of each carrier wave.
Preferably, when the modulation system of described baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, described adjustment unit is adjusted the phase place of corresponding transferred signal step by step, until described comparing unit determines that when the performance index of the modulation signal of afterbody output reach the performance index of setting, the transferred signal that described determining unit is determined modulation at different levels is as the transferred signal of described baseband signal.
Preferably, the phase place of described transferred signal comprises the carrier frequency of described transferred signal, the initial phase of described transferred signal.
Preferably, described adjustment unit is adjusted the initial phase of described transferred signal.
Preferably, described performance index comprise the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power and at least one in waveform quality Rho.
By above technical scheme, the present invention has realized following beneficial effect: can solve preferably the mutual interference problem of multi-carrier signal in wireless communication system, especially for the phase mutual interference between multi-carrier EV-DO signal in cdma system.Particularly evident to the improvement of performance in multicarrier disposed adjacent situation.Make so same wireless signal overlay area can have multicarrier to work simultaneously, greatly improved the availability of frequency spectrum, improve the flexibility of wireless planning, improve volume of business, transmission rate and the service quality of community, improved user's experience.
Accompanying drawing explanation
Fig. 1 is the carrier-in-interference schematic diagram of the three carrier waves appearance that cdma system frequency domain is adjacent;
Fig. 2 is to single-carrier modulated mode schematic diagram in wireless communication system;
Fig. 3 is the schematic diagram of the modulation system of multicarrier of the present invention;
Fig. 4 is the flow chart that the present invention reduces the method for multicarrier phase mutual interference;
Fig. 5 is the structural representation that the present invention selects parameter devices;
Fig. 6 is that utilization of the present invention selects parameter devices to adjust the structural representation of transferred signal;
The structural representation that disturbs processing unit falls in Fig. 7 while being carrier wave multi-level modulation of the present invention;
Fig. 8 is the composition structural representation that the present invention reduces the device of multicarrier phase mutual interference.
Embodiment
Basic thought of the present invention is: in multicarrier system, between the multicarrier that particularly frequency domain is adjacent, intercarrier can exist phase mutual interference.The present invention, by adjusting the phase place of the transferred signal of each carrier wave, makes the performance index of each modulation signal meet the performance index of setting.Due to the phase place of transferred signal and the carrier frequency of carrier wave and initial phase relevant, and the carrier frequency of carrier wave is planned by communication system substantially, belong to nonadjustable parameter, therefore, the present invention mainly adjustment of the initial phase by transferred signal reduces the interference between multicarrier.The present invention program realizes simple and practical.
For making the object, 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 modern wireless communication systems realizes communication by information is modulated on 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 completed as polytype modulators such as real number modulator, complex modulator or quadrature modulators by modulator.
The parameter of reflection transferred signal characteristic has a lot, and frequency and phase place are wherein two.For example, transferred signal C (t) can be expressed as: C (t)=A * cos (2 π ft+ θ)+j * A * sin (2 π ft+ θ).Wherein A is amplitude, and f is carrier frequency, the initial phase that θ is transferred signal, (2 π ft+ θ) is the phase place of transferred signal, and it is the function of a frequency f, time t and initial phase θ, unified with W (t in the present invention, f, θ) represent, referred to as W.If real modulation only need to be used the real part in C (t).
In traditional multi-carrier wireless communications system, only the frequency of transferred signal is made to appointment, and by the phase place W of transferred signal being made to special appointment, do not reach the object that reduces inter-carrier interference.
And the phase place W of transferred signal is a frequency f, the function of time t and initial phase θ, wherein t is the variable quantity in a moment, has represented the characteristic of signal, uncontrollable.F and θ are two controlled variablees, can reach the object of adjusting transferred signal phase place W by change wherein any one or change two variablees simultaneously.In wireless communication system, the carrier position of transmitting is had to stricter requirement, thereby a little less than the deviation range relative narrower flexibility of f, and initial phase θ has larger adjusting range and flexibility.Technical scheme of the present invention proposes for this feature just.
By accompanying drawing, further illustrate this point below.
Fig. 2 be in wireless communication system to single-carrier modulated mode schematic diagram, as shown in Figure 2, figure comprises that two parts are modulator 200 and transferred signal generator 201.Modulator 200 obtains output signal y for input signal x being modulated on transferred signal, and modulator 200 is real modulation device conventional in wireless communication system, plural debugger or quadrature modulator etc.Transferred signal generator 201 is according to input parameter, to complete the generation of transferred signal.Two input parameters in figure, have only been provided, frequency input parameter f and phase place output parameter θ.In traditional modulation system, according to the performance index of the parameter of input signal and output signal, transferred signal phase place is not done to special appointment and reach the object that reduces inter-carrier interference, so phase theta is not the function of input signal x and output signal y in figure.
Fig. 3 is the schematic diagram of the modulation system of multicarrier of the present invention, as shown in Figure 3, in figure, comprise equally that two parts are modulator 300 and transferred signal generator 301, its function is identical with transferred signal generator 201 with the modulator 200 in Fig. 2, but the phase place and the frequency parameter that are input to transferred signal are the functions of input signal x and output signal y, are different from traditional signal modulated process and transferred signal phase place are not done to special appointment.The present invention, by the modulation system of Fig. 3, selectively arranges transferred signal phase place, reaches the object that reduces the mutual interference effect of intercarrier.
Fig. 4 is the flow chart that the present invention reduces the method for multicarrier phase mutual interference, and as shown in Figure 4, the method that the present invention reduces the mutual interference of multicarrier phase comprises the following steps:
Step 401: input parameter is arranged.Input parameter comprises and represents the relevant parameter of input signal and the parameter of output signal performance index.For example: the type of incoming carrier is CDMA 1X signal in this example; Incoming carrier number is three carrier waves in this example; 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 transferred signal, in this example, the initial phase of carrier wave obtains the function by a random serial generator, and starts generator seed to be all set to 0 for the first time.Three carrier phase initial values that obtain by seed 0 are as input parameter; The frequency parameter of the first order transferred signal that incoming carrier is corresponding, is that disposed adjacent is-1.23MHz in this example, 0MHz, 1.23MHz.In this example, the initial phase of carrier wave obtains the function by a random serial generator, and starts generator seed to be all set to 0 for the first time.Three carrier phase initial values that obtain by seed 0 are as input parameter; The frequency parameter of the first order transferred signal that incoming carrier is corresponding, is that disposed adjacent is-1.23MHz in this example, 0MHz, 1.23MHz; The requirement of input to the performance index that transmit, this example for be 1X signal, the index of weighing 1X signal has: the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power, standard-required is-27dBc; Waveform quality Rho, standard-required 0.912.
Fig. 5 is the structural representation that the present invention selects parameter devices, as shown in Figure 5, several input parameters that the present invention needs while selecting parameter devices work have: the type parameter n of input signal, the signal number m of input signal, the positional information k of input signal, transferred signal initial phase θ, the original frequency parameter F of the feedback signal of input and transferred signal.In actual use, according to different systems or carrier case, can only use input parameter partly or completely.The present invention selects the output parameter of parameter devices to comprise transferred signal phase parameter W, the frequency parameter f of transferred signal and select parameter result indicative signal.Result indicative signal has represented an operating state of choosing ginseng device, and done state is still just in running status.This device (is constantly adjusted the initial phase of transferred signal according to the parameter mode that selects shown in Fig. 3, to determine that whether the performance index of the signal after modulation meet the performance index of setting) principle work, both can before system operation, use, also can in system running, use.
Fig. 6 is that utilization of the present invention selects parameter devices to adjust the structural representation of transferred signal, and as shown in Figure 6, modulator group, for realizing the modulation of multicarrier, can be the various types of modulators that adopt in wireless communication system.Modulator group has two groups of input signals, and one group is carrier signal (baseband signal) x1...xm of input, another one be transferred signal generator output be transferred signal 1......m.Wave multiplexer is for closing ripple by m single carrier after modulation.Coupler is for output signal being fed back to choosing ginseng device, as an input parameter of choosing ginseng device.Together with other input parameter, select parameter devices that the optimized algorithm according to certain is carried out to choosing of phase parameter.Finally the phase parameter W choosing and frequency parameter f are set in transferred signal generator.
Step 402: determine the performance index that transmit.The mode of determining the performance index that transmit can be by general measuring instrument, to extract three carrier performance indexs of correspondence after initial phase is set up, 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 403: the performance index of the performance index that obtain in step 402 and setting are compared, draw corresponding difference, as the foundation of carrier wave selected phase.If the performance index that transmit meet the performance index requirement of setting, exit phase place and adjust flow process, enter into step 405, otherwise enter into step 404: adjust stepping amount (adjustment amount), and return to step 401 and further adjust by the initial phase of transferred signal.
The adjustment algorithm of transferred signal initial phase is a constantly process for circulation, until the baseband signal that receiver demodulates meets the demands, Shi Caihui exits circulation.
First according to the frequency parameter of transferred signal, provide successively from big to small numbering from big to small.As in this example ,-1.23MHz is corresponding be numbered 1,0MHz corresponding be numbered 2,1.23MHz corresponding be numbered 3; Transferred signal phase place arranges the height of priority the numbering according to transferred signal is determined.If intercarrier is disposed adjacent, number so minimum priority minimum, 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 completing, setting will obtain a priority and transferred signal numbering array corresponding and that arrange from high to low one by one.In this example, each is numbered corresponding priority and is: what number 1 correspondence is 1, and what number 2 correspondences is 3, and what number 3 correspondences is 2.The larger priority of numeral is higher.
In the present invention, stepping amount is to be divided into two grades according to the difference amount that calculates the requirement of each carrier performance index and setting performance index in step 403: large stepping and little stepping.If obtain a difference of performance index in step 403, be greater than 0.6, adopt so larger step by step modulating initial phase, in this example, use 50 °, if obtain difference in step 403, be less than 0.6, adopt so the less mode of stepping to adjust phase place, in this example, adopt 20 ° of steppings.After completing, the setting of stepping amount just can obtain a transferred 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.
Obtain after priority and stepping amount, according to priority and stepping amount, the initial phase of each transferred signal is adjusted, until obtain the performance index of corresponding carrier wave, for optimum, will stop adjustment, here optimum judgment basis is that phase place increases and minimizing all can cause this carrier performance to worsen, and this time, corresponding carrier performance was optimum so.Complete will obtain one group after the modulation of all phase places and make relatively preferably phase-group of each carrier performance, and be referred to as the first round and adjust and obtain phase-group.In the first round, only check that whether each carrier performance is relatively excellent in stopping foundation, due to influencing each other between phase modulation, so the phase place that the first round obtains not necessarily makes each carrier performance can meet standard-required at every turn.The phase-group obtaining after adopting the first round to adjust, combines and checks whether each carrier wave can meet the demands, and meets and exits, and does not meet and carries out next round adjustment.
First the second view arranges the performance index that the first round adjusts gained phase place and extract each carrier wave when whole, the difference transmitting between performance index of the transferred signal of calculating and current best initial phase, according to the size of difference, the second priority of taking turns each carrier wave of phase modulation is set, the larger priority of difference is higher.Second takes turns unification in adjustment adopts less step by step modulating as 10 °.Whether every performance index of extracting corresponding phase-modulated carrier after a phase place that arrange, calculate and be improved, if be improved, continues so this carrier wave adjustment, if without improving, stops this carrier wave adjustment and carry out the adjustment of next carrier wave.So repeat until adjusted the phase place of all carrier waves, and claim this to take turns to adjust the phase-group obtaining and be referred to as second and take turns phase-group.
Second takes turns the phase-group obtaining after adjustment combines to check whether each carrier wave can meet the demands, and meets and exits, and does not meet and carries out next round adjustment.The mode that two-wheeled adopts respectively the mode of large stepping coarse adjustment to enter accurate adjustment with small step has above obtained the only relative one group of optimum phase-group of each carrier performance.In ensuing adjustment, adjusted once at every turn and by observing all carrier performance, whether be improved afterwards, only have the performance of all carrier waves to be all improved the phase place of just upgrading corresponding carrier wave, otherwise do not upgrade, and constantly according to difference size, upgrade priority, constantly according to as 1 ° come progressively reduce stepping amount, and the performance of all calculating each carrier wave after phase place has been set at every turn whether meets the demands, after meeting the demands, release, if satisfied, continue poll.When being polled to phase step input and being set to 0, show that the initial phase based on using seed full 0 to produce based on randomizer for the first time cannot find one group of suitable phase-group that carrier performance is met the demands in step 401, must upgrade one group of new randomizer seed this time, repeat the initial phase adjustment process of said method next time.Except randomizer seed be for the first time an initial value starting to provide for as in this example, be 0, other time seed renewal always adopt phase step in circulation last time to enter that while still not obtaining reasonable phase place at 0 o'clock to organize phase place as new seed.
What circulate in the manner described above searches, but avoid to certain situation repeatedly the seed of randomizer after upgrading, still can not find the situation of appropriate phase, prevent from adjusting and enter into an endless loop, thereby in once searching, be necessary the maximum times that regulation seed upgrades, in this example, be set to 20 times, if surpass 20 times, will exit current phase place adjustment, and inform that this time search unsuccessfully.After waiting for a period of time, re-start initial phase adjustment, until find suitable initial phase for each carrier wave.
Step 405: solidify the initial phase of carrier wave, be about to the current transferred signal that meets performance index and determine the transferred signal as baseband signal.
It should be noted that, when the modulation system of baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, step by step the phase place of corresponding transferred signal is adjusted, when the performance index of the modulation signal of to the last one-level output reach the performance index of setting, the transferred signal that modulation at different levels are determined is as the transferred signal of described baseband signal.
The structural representation that disturbs processing unit falls in Fig. 7 while being carrier wave multi-level modulation of the present invention, be the applicable cases of m carrier wave n level modulation as shown in Figure 7.Each transferred signal that the modulator group of every grade generates transferred signal generator group is adjusted, and the mode of adjustment and aforesaid adjustment mode are similar.Select the frequency parameter F of transferred signal in the input parameter of parameter devices to expand to m, n group, the initial phase θ of transferred signal expands to m n group.Can be optionally in the time of multi-level modulation the initial phase of one-level or multistage transferred signal be adjusted, be its objective is and make determined transferred signal can correctly demodulate baseband signal.
For the adjustment of initial phase of doing three carrier wave EV-DO signals of disposed adjacent in cdma system, the mode that contrasts aforementioned three carrier wave 1X signal phase adjustment is identical, and the performance index that transmit of input in step 401 that do not exist together exactly require different.The index of weighing EV-DO signal has: the waveform quality Rho1 that pilot channel is corresponding, the waveform quality Rho2 that MAC channel is corresponding, the waveform quality Rho3 that DATA channel is corresponding, the MAX IT1 that pilot channel is corresponding, the MAX IT2 that MAC channel is corresponding, the MAX IT3 that DATA channel is corresponding.
In addition, the present invention is equally applicable to do in cdma system the situation of two carrier wave EV-DO signals of disposed adjacent and the mixed configuration of 1 carrier wave 1X signal, with the difference of aforementioned adjustment mode be: in step 401, will input the performance index of requirement of the carrier wave of 1X and EV-DO simultaneously, in step 403, also need the configuration of priority slightly to change.In mixed configuration pattern, first EV-DO signal and 1X signal to be distinguished respectively, be divided into two pure EV-DO and pure 1X signal group.Two groups of signals are arranged respectively to the priority of phase modulation according to mode in foregoing example, after having arranged, will always higher than the principle of 1X priority, carrier wave be carried out to the adjustment of initial phase according to the priority of EV-DO.If for example in this example, the frequency parameter of the transferred signal of 1X signal is 1.23MHz, two other EV-DO is respectively 0MHz, and-1.23MHz provides being numbered of its correspondence and 1,2,3 according to describing above, obtains corresponding priority and be: 1,2,3.
The technical scheme that the present invention records is applicable 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 to be according to the performance index parameter corresponding to standard-required change signal of different systems, other steps will be identical.
Fig. 8 is the composition structural representation that the present invention reduces the device of multicarrier phase mutual interference, as shown in Figure 8, the device that the present invention reduces the mutual interference of multicarrier phase comprises adjustment unit 80, modulating unit 81, performance index determining unit 82, comparing unit 83 and determining unit 84, wherein, adjustment unit 80 is for adjusting the phase place of transferred signal; Modulating unit 81 is for being modulated to baseband signal described transferred signal; Performance index determining unit 82 is for determining the performance index of the rear signal of described modulating unit modulation; Comparing unit 83 is for comparing the performance index of signal and the performance index of setting after modulation, can not meet while setting performance index, trigger the phase place that adjustment unit 80 continues to adjust described transferred signal, meet while setting performance index, trigger determining unit 84; Determining unit 84 is for the transferred signal using current transferred signal as described baseband signal.The phase place of the transferred signal of 80 pairs of each carrier waves of adjustment unit is adjusted simultaneously.The transferred signal of 80 pairs of each carrier waves of adjustment unit is adjusted successively.The phase place of transferred signal comprises the carrier frequency of described transferred signal, the initial phase of described transferred signal.Adjustment unit 80 is adjusted the initial phase of described transferred signal.Described performance index comprise the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power and at least one in waveform quality Rho.
When the modulation system of baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, adjustment unit 80 is adjusted the phase place of corresponding transferred signal step by step, until comparing unit 83 determines that when the performance index of the modulation signal of afterbody output reach the performance index of setting, the transferred signal that determining unit 84 is determined modulation at different levels is as the transferred signal of described baseband signal.
Those skilled in the art are to be understood that, the device of the reduction multicarrier phase mutual interference shown in Fig. 8 of the present invention is to design for realizing the method for aforementioned reduction multicarrier phase mutual interference, the practical function of the each processing unit in Fig. 8 shown device 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 running on processor, also can realize by corresponding logical circuit.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. a method that reduces the mutual interference of multicarrier phase, is characterized in that, comprising:
According to the priority of transferred signal and stepping amount, adjust the phase place of transferred signal; Described priority is to set gradually numbering according to the frequency parameter size of transferred signal, and determines according to described numbering; Described stepping amount is to determine according to the difference amount of the performance index of transferred signal and setting performance index;
Baseband signal is modulated on described transferred signal; And
The performance index of signal and the performance index of setting after modulation are compared, can not meet while setting performance index, continue to adjust the phase place of described transferred signal, meet while setting performance index the transferred signal using current transferred signal as described baseband signal.
2. method according to claim 1, it is characterized in that, when the modulation system of described baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, step by step the phase place of corresponding transferred signal is adjusted, when the performance index of the modulation signal of to the last one-level output reach the performance index of setting, the transferred signal that modulation at different levels are determined is as the transferred signal of described baseband signal.
3. according to the method described in any one in claim 1 to 2, it is characterized in that, the phase place of described transferred signal comprises the initial phase of the carrier frequency of described transferred signal, described transferred signal.
4. method according to claim 3, is characterized in that, the phase place of described adjustment transferred signal is to adjust the initial phase of described transferred signal.
5. method according to claim 3, is characterized in that, described performance index comprise the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power and at least one in waveform quality Rho.
6. a device that reduces the mutual interference of multicarrier phase, is characterized in that, comprising:
Adjustment unit, for adjusting the phase place of transferred signal according to the priority of transferred signal and stepping amount; Described priority is to set gradually numbering according to the frequency parameter size of transferred signal, and determines according to described numbering; Described stepping amount is to determine according to the difference amount of the performance index of transferred signal and setting performance index;
Modulating unit, for being modulated to baseband signal described transferred signal;
Performance index determining unit, for determining the performance index of the rear signal of described modulating unit modulation;
Comparing unit, for the performance index of signal and the performance index of setting after modulation are compared, can not meet while setting performance index, triggers the phase place that described adjustment unit continues to adjust described transferred signal, meets while setting performance index, triggers determining unit; And
Determining unit, for the transferred signal using current transferred signal as described baseband signal.
7. device according to claim 6, it is characterized in that, when the modulation system of described baseband signal is cascade modulation, from the first order is modulated corresponding transferred signal, described adjustment unit is adjusted the phase place of corresponding transferred signal step by step, until described comparing unit determines that when the performance index of the modulation signal of afterbody output reach the performance index of setting, the transferred signal that described determining unit is determined modulation at different levels is as the transferred signal of described baseband signal.
8. according to the device described in any one in claim 6 to 7, it is characterized in that, the phase place of described transferred signal comprises the initial phase of the carrier frequency of described transferred signal, described transferred signal.
9. device according to claim 8, is characterized in that, described adjustment unit is adjusted the initial phase of described transferred signal.
10. device according to claim 8, is characterized in that, described performance index comprise the ratio MAX IT of the inactive code channel maximum power of carrier wave and activated code channel gross power and at least one in waveform quality Rho.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910165240.6A CN101998592B (en) | 2009-08-08 | 2009-08-08 | Method and device for reducing mutual interference of multiple carriers |
| PCT/CN2009/075913 WO2011017886A1 (en) | 2009-08-08 | 2009-12-23 | Method and device for decreasing multi-carrier mutual interference |
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| CN200910165240.6A CN101998592B (en) | 2009-08-08 | 2009-08-08 | Method and device for reducing mutual interference of multiple carriers |
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| CN101998592B true CN101998592B (en) | 2014-02-05 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101409701A (en) * | 2008-11-24 | 2009-04-15 | 北京朗波芯微技术有限公司 | Local oscillation buffer and method for correcting phase mismatch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1667987B (en) * | 2004-03-12 | 2011-03-23 | 上海贝尔阿尔卡特股份有限公司 | Adaptive communicating method and device |
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2009
- 2009-08-08 CN CN200910165240.6A patent/CN101998592B/en not_active Expired - Fee Related
- 2009-12-23 WO PCT/CN2009/075913 patent/WO2011017886A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101409701A (en) * | 2008-11-24 | 2009-04-15 | 北京朗波芯微技术有限公司 | Local oscillation buffer and method for correcting phase mismatch |
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| CN101998592A (en) | 2011-03-30 |
| WO2011017886A1 (en) | 2011-02-17 |
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