CN102932303B - Select method, the Apparatus and system of carrier wave rotatable phase - Google Patents
Select method, the Apparatus and system of carrier wave rotatable phase Download PDFInfo
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Abstract
The embodiment of the invention discloses method, the Apparatus and system of selecting carrier wave rotatable phase, its method comprises step: extract the training sequence code that at least one carrier wave uses; Simulation expansion is carried out to the training sequence code that described carrier wave uses, obtains the simulated training sequence code signal of described carrier wave; Use at least two default rotatable phases, phase rotating is carried out to the simulated training sequence code signal of described carrier wave; Peakvalue's checking is carried out to the spread training sequence code signal after described phase rotating; According to the result of peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.The reason high for carrier signal peak-to-average force ratio is optimized calculating, and when preselected carrier wave rotatable phase, by the training sequence code MIDAMBLE code to its use of carrier extract, and simulation expansion is carried out to the training sequence code extracted, making to greatly reduce amount of calculation when determining rotatable phase, decreasing computational complexity.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to method, the Apparatus and system of selecting carrier wave rotatable phase.
Background technology
TD SDMA (TD-SCDMA) mobile communication system is one of current 3G system mainstream standard, is a kind of multi-user's multi-carrier communications systems.In same community, multiple carrier wave carries the data of user respectively, and share a set of radio frequency sending set after carrying out conjunction road and launch, each carrier wave can carry the data of multiple user simultaneously.
According to TD-SCDMA agreement, the basic structure of its signal in time domain is continuously subframe.A subframe comprises up-downgoing pilot time slot, business time-slot and protection interval, and wherein business time-slot is for carrying the data service of each user.Wherein business time-slot structure as shown in Figure 1.
User's initial data by chnnel coding and multiplexing after, be mapped in the some physical channels under certain or certain several business time-slot, carry out respectively modulating, spread spectrum, scrambling and insertion training sequence MIDAMBLE code be (also known as middle leading code, lower with) etc. after process, merge the carrier data formed under this business time-slot.These data again through over-sampling, filtering, remove the process such as frequently after be modulated on corresponding carrier frequency.
In one section of Measuring Time, signal peak power and the root mean square ratio of signal power, be called peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), is called for short peak-to-average force ratio.The peak-to-average force ratio of discrete signal is shown below:
X herein
nit is the signal produced after each carrier wave closes road.
Some physical channels under above-mentioned each business time-slot, have the characteristic of code division multiple access after spread spectrum, all have multiple user and deposit under each time slot.In time domain, signal envelope is the superposition of multiple user's envelope.These user's envelopes have certain correlation, occur that the probability of in-phase stacking is comparatively large, easily occur larger signal peak, cause the problem that PAPR is excessive.
Meanwhile, between multicarrier, each carrier data also has certain correlation, and for CDMA multicarrier system, essence has had more user's envelope.Its intercarrier correlation is of equal value on the impact of peak-to-average force ratio on the correlation between multiple user when the impact of peak-to-average force ratio and single carrier.Signal in this system is the superposition of a large amount of statistically independently signal, and this makes the signal on TD-SCDMA link have higher PAPR.
When mentioning user data process above, need to insert the MIDAMBLE code being used for channel estimating.In same community, each carrier wave uses identical or different basic MIDAMBLE code.Each user data under each carrier wave, the MIDAMBLE code of use carries out different cyclic shifts to basic MIDAMBLE code to obtain.Under each carrier wave, the data that several physical channels on certain time slot carry have certain correlation, and wherein the correlation of MIDAMBLE code is especially outstanding.Three kinds of situations below, can cause MIDAMBLE code can be just the same: under same carrier wave, the identical code channel of MIDAMBLE code shared by same subscriber adopts; Under same carrier wave, different user adopts identical MIDAMBLE code; Between different carrier, different user adopts identical MIDAMBLE code.
At present multi-carrier TD-SCDMA is carried out to the peak-to-average force ratio suppression process of base band, major part have employed the phase rotating algorithm belonging to probability class methods.It is each user data between carrier wave or in carrier wave is carried out respectively to the rotation of a phase bit, reduce the correlation between them, reduce the possibility of their in-phase stacking that phase rotating calculates ratio juris.
The Chinese invention patent application that application number is CN200810101809.8, publication number is CN101534274A, publication date is on September 16th, 2009 " reduces method and the device of signal peak-to-average ratio " in mobile communication system in, disclose based under non-linear twiddle factor algorithm, adopt carrier wave independent process, some user data on each carrier wave are processed separately, avoids the additional communication of each carrier wave place hardware.But the user data of each carrier wave through phase rotating, merge and be modulated to each carrier frequency Shang Binghe road after, signal peak-to-average ratio can regenerate, and peak to average inhibition is not obvious.
As described above, existing about reducing in the method for the peak-to-average force ratio that TD-SCDMA multicarrier system transmits, or do not have to be optimized calculating for the basic reason that PAR of carrier signal is high, the variable demand of multicarrier frequency can not be adapted to; Or do not have suitable method choice to go out suitable carrier wave rotatable phase, to lower peak-to-average force ratio; Or do not take into full account that the number of times of Interpolation of signals filtering causes peak regeneration, reduce PAR of carrier signal effect poor.
Summary of the invention
The embodiment of the present invention provides a kind of method selecting carrier wave rotatable phase, comprises the following steps:
Extract the training sequence code that at least one carrier wave uses;
Simulation expansion is carried out to the training sequence code that described carrier wave uses, obtains the simulated training sequence code signal of described carrier wave;
Use at least two default rotatable phases, phase rotating is carried out to the simulated training sequence code signal of described carrier wave;
Peakvalue's checking is carried out to the spread training sequence code signal after described phase rotating;
According to the result of peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.
The embodiment of the present invention also provides a kind of carrier wave rotatable phase determining device, comprising: training sequence code extraction module, for extracting used training sequence code from least one carrier wave; Simulation expansion module, the training sequence code for using described carrier wave carries out simulation expansion, obtains the simulated training sequence code signal of described carrier wave; Phase rotation module, for using at least two default rotatable phases, carries out phase rotating to the simulated training sequence code signal of described carrier wave; Peak detection block, for carrying out peakvalue's checking to the spread training sequence code signal after described phase rotating; Judge module, for the result according to peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.
The embodiment of the present invention, providing a kind of system reducing peak-to-average force ratio, comprises carrier wave rotatable phase determining device and phase rotation units; Wherein, carrier wave rotatable phase determining device comprises: training sequence code extraction module, for extracting used training sequence code from least one carrier wave; Simulation expansion module, the training sequence code for using described carrier wave carries out simulation expansion, obtains the simulated training sequence code signal of described carrier wave; Phase rotation module, for using at least two default rotatable phases, carries out phase rotating to the simulated training sequence code signal of described carrier wave; Peak detection block, for carrying out peakvalue's checking to the spread training sequence code signal after described phase rotating; Judge module, for the result according to peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.The rotatable phase that described phase rotation units is used for determining according to described carrier wave rotatable phase determining device carries out phase rotating to carrier wave.
Method, the Apparatus and system of the selection carrier wave rotatable phase that the embodiment of the present invention provides, when preselected carrier wave rotatable phase, by the training sequence code MIDAMBLE code to its use of carrier extract, and simulation expansion is carried out to the training sequence code extracted, making to greatly reduce amount of calculation when determining rotatable phase, decreasing computational complexity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art TD-SCDMA business time-slot structure;
Fig. 2 is the method flow diagram selecting carrier wave rotatable phase in one embodiment of the invention;
Fig. 3 is the structural representation of carrier wave rotatable phase determining device in another embodiment of the present invention;
Fig. 4 is the structural representation of the system reducing peak-to-average force ratio in another embodiment of the present invention; With
Fig. 5 is the structural representation of the system reducing peak-to-average force ratio in another embodiment of the present invention.
Embodiment
In order to make those skilled in the art person understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 2, the embodiment of the present invention provides a kind of method selecting carrier wave rotatable phase, comprises the following steps:
Step 201: extract the training sequence code that at least one carrier wave uses;
Step 202: simulation expansion is carried out to the training sequence code that described carrier wave uses, obtains the simulated training sequence code signal of described carrier wave;
Step 203: use at least two rotatable phases preset, phase rotating is carried out to the simulated training sequence code signal of described carrier wave;
Step 204: peakvalue's checking is carried out to the spread training sequence code signal after described phase rotating;
Step 205: according to the result of peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.
In the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, the reason high for carrier signal peak-to-average force ratio is optimized calculating, and when preselected carrier wave rotatable phase, by the training sequence code MIDAMBLE code to its use of carrier extract, and simulation expansion is carried out to the training sequence code extracted, making to greatly reduce amount of calculation when determining rotatable phase, decreasing computational complexity.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, the span of at least two rotatable phases preset be [0,2 π).
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, simulation expansion is carried out to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise step: superposition in carrier wave is carried out to the training sequence code extracted and produces the simulated training sequence code baseband signal of described carrier wave.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, simulation expansion is carried out to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise step: the simulated training sequence code signal that interpolation filtering produces described carrier wave is carried out to the training sequence code extracted.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, simulation expansion is carried out to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise step: the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave is carried out to the training sequence code extracted.
Be appreciated that in different applications, the training sequence code used described carrier wave carries out simulation spread step and can simulate according to actual needs.Such as simulation expansion can be the combination in any of other application modes such as above-mentioned interior superposition, interpolation, filtering, intermediate frequency Modulation.This combination is not limited to the combination examples that the embodiment of the present invention provides.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, simulation expansion is carried out to the training sequence code that described carrier wave uses, obtains the simulated training sequence code signal of described carrier wave, specifically comprise the following steps:
To the training sequence code MID extracted
m,ncarry out superposition in carrier wave and produce the simulated training sequence code baseband signal of each carrier wave
wherein, described at least one carrier wave specifically comprises N number of carrier wave, and n is carrier number index, n=1 ... N, N are carrier number,
m is the call number of each physical code channel of carrier wave n, m=1 ... M, M are the physical code channel number of carrier wave n;
To each carrier wave training sequence code baseband signal
carry out the simulated training sequence code signal that analog interpolation filtering and intermediate frequency Modulation obtain described carrier wave
Wherein, function h
rRCrepresent X times of interpolation and RRC filtering process, function h
hBrepresent Y times of interpolation and semi-band filtering process, function m represents the intermediate frequency Modulation of signal being carried out to a corresponding n frequency, function h
crepresent Z times of interpolation and comb filtering process, X, Y, Z are natural number.Optionally, X=2, Y=4, Z=6.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the present invention provides, according to the result of peakvalue's checking, the described carrier wave corresponding rotatable phase used when determining to meet pre-set peak value condition; Comprise the following steps:
Relatively detect the peak value obtained, obtain the minimum peak relatively; Here also can need according to system the peak value of selecting other suitable.
Determine that rotatable phase that pre-set peak value condition is: the described carrier wave corresponding to minimum peak above-mentioned steps determined is as the rotatable phase used corresponding to described carrier wave.
Be appreciated that the method for the selection carrier wave rotatable phase that the embodiment of the present invention proposes optionally is applicable in TD-SCDMA system.
1, after base station system starts, carry out disposable self adaptation computing, extraction system parameter, calculate the best rotatable phase of applicable native system parameter, and record best rotatable phase.
2, extract the best rotatable phase of record, after system is normally run, each time slot is all to each carrier slots baseband signal of the framing that the BBU device of routine exports, and fixing this best rotatable phase that uses carries out carrier phase rotation.
3, export each carrier slots baseband signal rotated through carrier phase to process to conventional RRU device.
In the step 1 of the inventive method, described extraction system parameter comprises the IF spot that each carrier wave of extraction system uses, each carrier wave uses the id number of basic MIDAMBLE code, RRU interpolation and filtering parameter etc.; The described best rotatable phase calculating applicable native system parameter also comprises: the id number of the basic MIDAMBLE code utilizing each carrier wave extracted in extraction system parameter to use extracts the basic MIDAMBLE code of each carrier wave, RRU interpolated signal and filtering parameter and produces simulation MIDAMBLE signal.
In TD-SCDMA system, basic MIDAMBLE code has 128, prestores in systems in which, can extract the basic MIDAMBLE code of its correspondence according to the id number of each carrier wave MIDAMBLE code separately.
In TD-SCMDA system, the signal processing mode that general employing BBU with RRU is separated, BBU is only to RRU output time solt baseband signal, and the mode of different RRUs process is had nothing in common with each other, when RRU interpolation is different with the parameter of filtering, the peak regeneration effect produced the same time slot baseband signal exported through postrotational BBU is different, therefore when the time slot baseband signal exported BBU rotates, the parameter of RRU interpolation and filtering should be taken into full account, namely when producing simulation MIDAMBLE signal, the parameter of input RRU interpolation and filtering, MIDAMBLE signal is simulated out completely.
Simulation MIDAMBLE signal can produce in accordance with the following methods: make the basic MIDAMBLE code of each carrier wave be
wherein n is carrier number index, n=1 ... N, N are carrier number.Utilize the basic MIDAMBLE code of each carrier wave
produce expansion MIDAMBLE code MID
m,n, wherein m is the call number of each physical code channel of carrier wave n, m=1 ... M, M are the physical code channel number of carrier wave n.Certainly, the non-full physical code channel situation of M<16 can also be simulated.When each carrier wave physical code channel takes time, peak-to-average force ratio is maximum, and state when therefore only needing simulation 16 physical code channels to take completely, can simulate the situation that peak-to-average force ratio is maximum.
In the present embodiment, the situation of M=16 is adopted to be explained.To the expansion MIDAMBLE code MID of each carrier wave
m,ncarry out superposition in carrier wave and produce each carrier wave MIDAMBLE baseband signal:
To each carrier wave MIDAMBLE baseband signal
carry out analog interpolation filtering and intermediate frequency Modulation, interpolation filtering here and intermediate frequency Modulation should fully according to the parameters of RRU, and therefore parameter can change according to concrete RRU.During practical application, the generation of each carrier wave simulation MIDAMBLE signal is determined by the interpolation filtering of concrete RRU and the parameter of intermediate frequency Modulation.In the present embodiment, the processing mode of certain RRU is adopted to be described, if baseband signal is respectively through 2 times of interpolations, RRC filtering, 4 times of interpolations, semi-band filtering, intermediate frequency Modulation, 6 times of interpolations and combed filters.Make function h
rRCi () represents 2 times of interpolations and RRC filtering process, function h
hBi () represents 4 times of interpolations and semi-band filtering process, function m (i) represents the intermediate frequency Modulation of signal being carried out to a corresponding n frequency, function h
ci () represents 6 times of interpolations and comb filtering process.Interpolation filtering and intermediate frequency Modulation are carried out to each carrier wave MIDAMBLE baseband signal and produce each carrier wave simulation MIDAMBLE signal:
In the present embodiment, in the step 1 of the inventive method, the described best rotatable phase calculating applicable native system parameter, also comprises all possible rotatable phase combination generating and correspond to each carrier wave, uses each combination respectively successively to each carrier wave simulation MIDAMBLE signal
carry out carrier wave rotation, carrier wave simulation MIDAMBLE signal each after postrotational rotation is carried out to peakvalue's checking and produces some peak values.
In the present embodiment, in the step 1 of the inventive method, the described best rotatable phase calculating applicable native system parameter, also comprise and above-mentioned some peak values are compared, using the rotatable phase of each carrier wave corresponding to minimum peak as result of calculation (i.e. the best rotatable phase of each carrier wave).
In the step 2 of the inventive method, comprise step:
21, each carrier slots baseband signal of framing and the best rotatable phase of each carrier wave is extracted.
22, each time slot all carries out carrier phase rotation to fixing this best rotatable phase that uses of each carrier slots baseband signal of framing.
Each carrier slots baseband signal of the framing in above-mentioned steps 21 is exported by system BBU.The best rotatable phase of each carrier wave is the best rotatable phase of each carrier wave produced in above-mentioned steps 2.
In the step 3 of the inventive method, comprise step:
31, interpolation filtering is carried out to each carrier slots baseband signal through phase rotating.
32, RRC filtering is carried out to each carrier slots baseband signal through interpolation filtering.
33, further interpolation filtering is carried out to each carrier slots baseband signal through RRC filtering.
34, carrier wave is carried out to each carrier slots baseband signal through further interpolation filtering and close road.
As shown in Figure 3, the embodiment of the present invention also provides a kind of carrier wave rotatable phase determining device 300, comprises training sequence code extraction module 301, simulation expansion module 302, phase rotation module 303, peak detection block 304, judge module 305.Wherein, training sequence code extraction module 301 for extracting used training sequence code from least one carrier wave; Simulation expansion module 302 carries out simulation expansion for the training sequence code extracted training sequence code extraction module 301, obtains the simulated training sequence code signal of described carrier wave; Phase rotation module 303, for using at least two default rotatable phases, carrying out phase rotating to the simulated training sequence code signal that simulation expansion module 302 obtains, exporting the spread training sequence code signal after phase rotating; Peak detection block 304 carries out peakvalue's checking for the spread training sequence code signal after the phase rotating that exports according to phase rotation module 303; Judge module 305 for the peakvalue's checking result according to phase rotation module 303, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.The carrier wave rotatable phase determining device that the embodiment of the present invention provides, by its training sequence code MIDAMBLE used of training sequence code extraction module 301 pairs of carrier extracts, make in phase place pre-rotation, taken into full account that the generation of peak-to-average force ratio is the reason that MIDAMBLE causes, and then make simulation expansion module 302 greatly reduce amount of calculation when simulating expansion, decrease computational complexity.
Optionally, at least two rotatable phases that phase rotation module 303 is preset, and the span of described at least two rotatable phases be [0,2 π).
Optionally, expansion module 302 is simulated for carrying out superposing in carrier wave, to produce the simulated training sequence code baseband signal of described carrier wave to the training sequence code extracted.
Optionally, expansion module 302 is simulated for carrying out interpolation filtering, to produce the simulated training sequence code signal of described carrier wave to the training sequence code extracted.
Optionally, expansion module 302 is simulated for carrying out to the training sequence code extracted the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
Optionally, the training sequence code MID of expansion module 302 for extracting described training sequence code is simulated
m,ncarry out superposition in carrier wave and produce the simulated training sequence code baseband signal of each carrier wave
wherein, described at least one carrier wave specifically comprises N number of carrier wave, and n is carrier number index, n=1 ... N, N are carrier number,
m is the call number of each physical code channel of carrier wave n, m=1 ... M, M are the physical code channel number of carrier wave n;
To each carrier wave training sequence code baseband signal
carry out the simulated training sequence code signal that analog interpolation filtering and intermediate frequency Modulation obtain described carrier wave
Wherein, function h
rRCrepresent X times of interpolation and RRC filtering process, function h
hBrepresent Y times of interpolation and semi-band filtering process, function m represents the intermediate frequency Modulation of signal being carried out to a corresponding n frequency, function h
crepresent Z times of interpolation and comb filtering process, X, Y, Z are natural number.Optionally, X=2, Y=4, Z=6.
Optionally, judge module 305, specifically for comparing the peak value detecting and obtain, obtains the minimum peak relatively; Using the rotatable phase of the described carrier wave corresponding to minimum peak as the rotatable phase used corresponding to described carrier wave.
Refer to Fig. 4, the embodiment of the present invention also provides a kind of carrier wave rotatable phase determining device 300 that uses to reduce the reduction peak-to-average force ratio system 400 of system peak-to-average ratio, comprises carrier wave rotatable phase determining device 300 and phase rotation units 500; Wherein phase rotation units 500 carries out phase rotating for the rotatable phase determined according to described carrier wave rotatable phase determining device to carrier wave.Be appreciated that phase rotation units 500 here and the public set of system of phase rotation module 303, reduce cost.
Wherein, carrier wave rotatable phase determining device 300, comprises training sequence code extraction module 301, simulation expansion module 302, phase rotation module 303, peak detection block 304, judge module 305.Wherein, training sequence code extraction module 301 for extracting used training sequence code from least one carrier wave; Simulation expansion module 302 carries out simulation expansion for the training sequence code extracted training sequence code extraction module 301, obtains the simulated training sequence code signal of described carrier wave; Phase rotation module 303, for using at least two default rotatable phases, carrying out phase rotating to the simulated training sequence code signal that simulation expansion module 302 obtains, exporting the spread training sequence code signal after phase rotating; Peak detection block 304 carries out peakvalue's checking for the spread training sequence code signal after the phase rotating that exports according to phase rotation module 303; Judge module 305 for the peakvalue's checking result according to phase rotation module 303, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.The carrier wave rotatable phase determining device that the embodiment of the present invention provides, by its training sequence code MIDAMBLE used of training sequence code extraction module 301 pairs of carrier extracts, make in phase place pre-rotation, taken into full account that the generation of peak-to-average force ratio is the reason that MIDAMBLE causes, and then make simulation expansion module 302 greatly reduce amount of calculation when simulating expansion, decrease computational complexity.
As shown in Figure 5, the low complex degree that another embodiment of the present invention provides reduces the system 600 of peak-to-average force ratio, comprising: the best rotatable phase generation module 610 connected successively, reduction peak-to-average force ratio module 620 and RRU module 630.Best rotatable phase generation module 610, for carrying out disposable self adaptation computing after base station system starts, calculates the best rotatable phase of applicable native system parameter; Reduce peak-to-average force ratio module 620, for extracting the best rotatable phase recorded, after system is normally run, each time slot is all to each carrier slots baseband signal of the framing that Base Band Unit Base Band Unit (hereinafter referred to as BBU) of routine exports, and fixing this best rotatable phase that uses carries out carrier phase rotation; Remote Radio Unit Radio Remote Unit (hereinafter referred to as RRU) 630, carries out follow-up routine operation for each carrier slots baseband signal exported through phase rotating to conventional RRU device.
In described best rotatable phase generation module 610, comprise best rotatable phase computing module 611, and the system parameters extraction module 612, the carrier phase generation module 613 that are connected with best rotatable phase computing module 611 respectively.Described system parameters extraction module 612, the id number of basic MIDAMBLE code, RRU interpolation and filtering parameter etc. that the IF spot used for each carrier wave of extraction system, each carrier wave use; Described carrier phase generation module 613, for generating all possible rotatable phase combination corresponding to each carrier wave; Described best rotatable phase computing module 611, the id number of the basic MIDAMBLE code that each carrier wave extracted for utilizing system parameters extraction module uses extracts the basic MIDAMBLE code of each carrier wave, RRU interpolation and filtering parameter and produces simulation MIDAMBLE signal.
Further, above-mentioned best rotatable phase computing module 611, also for extracting all possible rotatable phase combination corresponding to each carrier wave generated in advance from carrier phase generation module, use each rotatable phase to combine respectively and successively carrier wave rotation is carried out to the original MIDAMBLE signal of simulation, after rotating postrotational simulation, MIDAMBLE signal carries out conjunction road, produce simulation and close road MIDAMBLE signal, road MIDAMBLE signal is closed to simulation and carries out peakvalue's checking and produce some peak values.
Further, above-mentioned best rotatable phase computing module 611, also for comparing above-mentioned some peak values, using the rotatable phase of each carrier wave corresponding to minimum peak as result of calculation (i.e. the best rotatable phase of each carrier wave).
Described reduction peak-to-average force ratio module 620, comprises time slot baseband signal and best rotatable phase extraction module 621, and the phase rotation module 622 be connected with best rotatable phase extraction module with time slot baseband signal.Described time slot baseband signal and best rotatable phase extraction module 621 to reduce in peak-to-average force ratio module each carrier slots baseband signal of framing and the best rotatable phase of each carrier wave for extracting.Described phase rotation module 622 is for all carrying out carrier phase rotation to fixing this best rotatable phase that uses of each carrier slots baseband signal of framing at each time slot.
In described RRU module 630, also for carrying out interpolation filtering to each carrier slots baseband signal through phase rotating, RRC filtering is carried out to each carrier slots baseband signal through interpolation filtering, further interpolation filtering is carried out to each carrier slots baseband signal through RRC filtering, carrier wave is carried out to each carrier slots baseband signal through further interpolation filtering and closes road.
Described carrier phase generation module 613 can be the hardware memory having prestored some combination carrier phase observations, also can be the computing module calculating carrier phase in real time.In embodiments of the present invention, in order to save hardware space further, and when system boot, allowing the calculating carrying out one period of long period, therefore have employed the computing module of calculating carrier phase in real time as carrier phase generation module.No matter take the mode prestoring or calculate in real time, because the method producing all possible rotatable phase combination corresponding to each carrier wave is not limit, carrier wave rotatable phase size is not limit, the rotatable phase span of each carrier wave is [0,2 π).In theory, the group number that the generation described in the present invention corresponds to all possible rotatable phase combination of each carrier wave is unlimited many groups.Due to physical constraints, so the carrier wave rotatable phase of some only need be produced.In embodiments of the present invention, owing to allowing the calculating carrying out one period of long period when system starts, therefore can combine as random phase, low correlation sequence phase etc. produce more carrier wave rotatable phase according to certain rule, strengthen the effect reducing peak-to-average force ratio.
Due to 0 and the particularity of π, when carrying out 0 and the phase rotating of π, each baseband time slot signal phase rotation module specific implementation will significantly simplify.When certain baseband time slot signal carries out 0 phase rotating, the base band time slot signal of this carrier wave directly remains unchanged and can realize; When certain baseband time slot signal carries out π phase rotating, the base band time slot signal of this carrier wave is directly got negative value and can be realized.Therefore the carrier phase generation module of the present embodiment produces the arrangement of each carrier wave correspondence difference corresponding 0 and π two kinds of phase places.If carrier number N=3, the raw combination carrier phase observation 8 groups of common property; If carrier number N=6, the raw combination carrier phase observation 64 groups of common property; If carrier number N=9, the raw combination carrier phase observation 512 groups of common property.
To each carrier wave simulation MIDAMBLE signal being carried out conventional interpolation filtering and intermediate frequency Modulation generation by each carrier wave MIDAMBLE baseband signal
utilize some groups of combination carrier phase observations of above-mentioned generation to carry out carrier wave rotation successively and superposition conjunction road, road MIDAMBLE signal is closed in the simulation producing corresponding some groups.The peak value simulations conjunction road MIDAMBLE signals of some groups being carried out respectively to signal modulus value is asked for, and produces the peak value of corresponding some groups.Each group combination carrier phase observation i.e., the peak value of road MIDAMBLE signal modulus value is closed in an all corresponding simulation.
Can find out, the embodiment of the present invention is by when arranging net in base station, extract the frequency that each carrier wave of fixed TD-SCDMA system uses, carry out the MIDAMBLE code that each carrier wave of disposable analysis uses in advance and carry out analog carrier rotation, intermediate frequency Modulation, peak value after abundant interpolation filtering also superposes generates situation, carrier wave rotatable phase optimum under calculating corresponding current frequency, and use the carrier wave anglec of rotation of this optimum to be fixing simple carrier wave rotatable phase, avoid each time slot all will repeat to carry out a large amount of traversal computing reduction system throughputs to whole time slot data and significantly increase system hardware resources consumption.System is after actual motion, simple carrier wave rotation need only be carried out, the calculating of any complexity need not be increased, fundamentally not influential system real-time, hardware consumption how need not be increased, the peak-peak that after ensureing to inhibit each baseband signals intermediate frequency Modulation to close road, MIDAMBLE code produces simultaneously, effectively reduces peak-to-average force ratio.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. select a method for carrier wave rotatable phase, it is characterized in that: comprise the following steps:
Extract the training sequence code that at least one carrier wave uses;
Simulation expansion is carried out to the training sequence code that described carrier wave uses, obtains the simulated training sequence code signal of described carrier wave; Described simulation expands to any one or combination in any in superposition in carrier wave, interpolation filtering, intermediate frequency Modulation;
Use at least two default rotatable phases, phase rotating is carried out to the simulated training sequence code signal of described carrier wave;
Peakvalue's checking is carried out to the spread training sequence code signal after described phase rotating;
According to the result of peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.
2. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that:
The span of at least two rotatable phases preset be [0,2 π).
3. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that: carry out simulation expansion to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise the following steps:
Superposition in carrier wave is carried out to the training sequence code extracted and produces the simulated training sequence code baseband signal of described carrier wave.
4. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that: carry out simulation expansion to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise the following steps:
The simulated training sequence code signal that interpolation filtering produces described carrier wave is carried out to the training sequence code extracted.
5. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that: carry out simulation expansion to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise the following steps:
The simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave is carried out to the training sequence code extracted.
6. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that: carry out simulation expansion to the training sequence code that described carrier wave uses, obtain the simulated training sequence code signal of described carrier wave, comprise the following steps:
To the training sequence code MID extracted
m,ncarry out superposition in carrier wave and produce the simulated training sequence code baseband signal of each carrier wave
wherein, described at least one carrier wave specifically comprises N number of carrier wave, and n is carrier number index, n=1 ... N, N are carrier number,
m is the call number of each physical code channel of carrier wave n, m=1 ... M, M are the physical code channel number of carrier wave n;
To each carrier wave training sequence code baseband signal
carry out the simulated training sequence code signal that analog interpolation filtering and intermediate frequency Modulation obtain described carrier wave
Wherein, function h
rRCrepresent X times of interpolation and RRC filtering process, function h
hBrepresent Y times of interpolation and semi-band filtering process, function m represents the intermediate frequency Modulation of signal being carried out to a corresponding n frequency, function h
crepresent Z times of interpolation and comb filtering process, X, Y, Z are natural number.
7. the method selecting carrier wave rotatable phase as claimed in claim 1, is characterized in that: according to the result of peakvalue's checking, the described carrier wave corresponding rotatable phase used when determining to meet pre-set peak value condition; Comprise the following steps:
Relatively detect the peak value obtained, obtain the minimum peak relatively;
Determine pre-set peak value condition for: using the rotatable phase of the described carrier wave corresponding to minimum peak as the rotatable phase used corresponding to described carrier wave.
8. a carrier wave rotatable phase determining device, is characterized in that, comprising:
Training sequence code extraction module, for extracting used training sequence code from least one carrier wave;
Simulation expansion module, the training sequence code for using described carrier wave carries out simulation expansion, obtains the simulated training sequence code signal of described carrier wave; Described simulation expands to any one or combination in any in superposition in carrier wave, interpolation filtering, intermediate frequency Modulation;
Phase rotation module, for using at least two default rotatable phases, carries out phase rotating to the simulated training sequence code signal of described carrier wave;
Peak detection block, for carrying out peakvalue's checking to the spread training sequence code signal after described phase rotating;
Judge module, for the result according to peakvalue's checking, when determining to meet pre-set peak value condition, the rotatable phase that described carrier wave uses.
9. carrier wave rotatable phase determining device as claimed in claim 8, is characterized in that:
Described phase rotation module preset at least two rotatable phases, and the span of described at least two rotatable phases be [0,2 π).
10. carrier wave rotatable phase determining device as claimed in claim 8, is characterized in that: described simulation expansion module is specifically for carrying out superposing in carrier wave, to produce the simulated training sequence code baseband signal of described carrier wave to the training sequence code extracted.
11. carrier wave rotatable phase determining devices as claimed in claim 8, is characterized in that: described simulation expansion module is specifically for carrying out interpolation filtering, to produce the simulated training sequence code signal of described carrier wave to the training sequence code extracted.
12. carrier wave rotatable phase determining devices as claimed in claim 8, is characterized in that: described simulation expansion module is specifically for carrying out to the training sequence code extracted the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
13. carrier wave rotatable phase determining devices as claimed in claim 8, is characterized in that: the training sequence code MID of described simulation expansion module specifically for extracting described training sequence code
m,ncarry out superposition in carrier wave and produce the simulated training sequence code baseband signal of each carrier wave
wherein, described at least one carrier wave specifically comprises N number of carrier wave, and n is carrier number index, n=1 ... N, N are carrier number,
m is the call number of each physical code channel of carrier wave n, m=1 ... M, M are the physical code channel number of carrier wave n;
To each carrier wave training sequence code baseband signal
carry out the simulated training sequence code signal that analog interpolation filtering and intermediate frequency Modulation obtain described carrier wave
Wherein, function h
rRCrepresent X times of interpolation and RRC filtering process, function h
hBrepresent Y times of interpolation and semi-band filtering process, function m represents the intermediate frequency Modulation of signal being carried out to a corresponding n frequency, function h
crepresent Z times of interpolation and comb filtering process, X, Y, Z are natural number.
14. carrier wave rotatable phase determining devices as claimed in claim 8, is characterized in that: described judge module, specifically for comparing the peak value detecting and obtain, obtains the minimum peak relatively; Using the rotatable phase of the described carrier wave corresponding to minimum peak as the rotatable phase used corresponding to described carrier wave.
15. 1 kinds of systems reducing peak-to-average force ratio, is characterized in that: comprise the carrier wave rotatable phase determining device as described in claim 8-14 and phase rotation units;
Wherein, the rotatable phase that described phase rotation units is used for determining according to described carrier wave rotatable phase determining device carries out phase rotating to carrier wave.
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| EP3516776B1 (en) * | 2016-09-23 | 2022-02-16 | Huawei Technologies Co., Ltd. | Digital front end for use with direct digital radio frequency modulator |
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