CN102932303A - Method, device and system for selecting rotating phase of carrier - Google Patents
Method, device and system for selecting rotating phase of carrier Download PDFInfo
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Abstract
The embodiment of the invention discloses a method, a device and a system for selecting the rotating phase of a carrier. The method comprises the following steps of: extracting a training sequence code used by at least one carrier; performing analogue expansion on the training sequence code used by the carriers to obtain analogue training sequence code signals of the carriers; performing phase rotation on the analogue training sequence code signals of the carriers by using at least two preset rotating phases; performing peak detection on the phase-rotated expanded training sequence code signals; and determining the rotating phase used by the carriers when peak detection results are in line with a preset peak condition according to the peak detection results. Optimization calculation is realized for reasons for high peak-to-average ratios of signals of the carriers, and when the rotating phase of the carriers is pre-selected, a MIDAMBLE code used by the carriers is extracted, and the extracted training sequence code is subjected to the analogue expansion, so that a calculated amount during the determination of the rotating phase is greatly reduced, and calculation complexity is lowered.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to method, the Apparatus and system of selecting the 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 residential quarter, a plurality of carrier waves carry respectively user's data, close a shared cover radio frequency sending set emission behind the road, and each carrier wave can carry a plurality of users' data simultaneously.
According to the TD-SCDMA agreement, the basic structure of its signal on time domain is subframe continuously.A subframe comprises up-downgoing pilot time slot, business time-slot and protection interval, and wherein business time-slot is used for each user's of carrying data service.Wherein the 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-slots, modulate respectively, spread spectrum, scrambling and insertion training sequence MIDAMBLE code (leading code in also claiming, lower with) etc. process after, merge the carrier data that forms under this business time-slot.These data are again through over-sampling, filtering, be modulated on the corresponding carrier frequency after removing the processing such as frequency.
In one section Measuring Time, the root mean square ratio of signal peak power and signal power is 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
nThat each carrier wave closes the signal that produces behind the road.
Some physical channels under each above-mentioned business time-slot have the characteristic of code division multiple access behind the spread spectrum, a plurality of users are all arranged under each time slot and deposit.On time domain, signal envelope is the stack of a plurality of user's envelopes.These user's envelopes have certain correlation, occur greatlyr with superimposed probability, larger signal peak easily occurs, cause the excessive problem of PAPR.
Simultaneously, multicarrier among carrier data also has certain correlation, and for CDMA multicarrier system, essence is that more user's envelope has been arranged.Its intercarrier correlation during on the impact of peak-to-average force ratio and single carrier the correlation between a plurality of users of equal value on the impact of peak-to-average force ratio.Signal in this system is the in a large number independently stack of signal on statistics, and this is so that the signal on the TD-SCDMA link has higher PAPR.
When the user data processing is mentioned in the front, need to insert the MIDAMBLE code that is used for channel estimating.In the same residential quarter, each carrier wave uses identical or different basic MIDAMBLE code.Each user data under each carrier wave, the MIDAMBLE code of use are that basic MIDAMBLE code is carried out different cyclic shifts is resulting.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.Below three kinds of situations, can cause the MIDAMBLE code can be just the same: under the same carrier wave, identical MIDAMBLE code be adopted by the shared code channel of same subscriber; Under the same carrier wave, different user adopts identical MIDAMBLE code; Between the different carrier, different user adopts identical MIDAMBLE code.
At present multi-carrier TD-SCDMA is carried out the peak-to-average force ratio inhibition processing of base band, major part has adopted the phase rotating algorithm that belongs to the probability class methods.The principle of phase rotating algorithm is, each user data between the carrier wave or in the carrier wave carried out respectively the rotation of a phase bit, reduces the correlation between them, and reducing them may with superimposed.
Application number is that CN200810101809.8, publication number are CN101534274A, open day were in the Chinese invention patent application " method and the device of reduction signal peak-to-average ratio in the mobile communication system " on September 16th, 2009, disclose under based on non-linear twiddle factor algorithm, adopt the carrier wave independent process, some user data on each carrier wave are processed separately, avoided the additional communication of each carrier wave place hardware.But the user data of each carrier wave through phase rotating, merge and be modulated on each carrier frequency and after closing the road, signal peak-to-average ratio can be regenerated, the peak to average inhibition is not obvious.
As indicated above, existing about in the method that reduces the peak-to-average force ratio that TD-SCDMA multicarrier system transmits, or do not optimized calculating, can not adapt to the variable demand of multicarrier frequency for the high basic reason of PAR of carrier signal; Or do not have suitable method to select suitable carrier wave rotatable phase, to lower peak-to-average force ratio; Or the number of times that does not take into full account Interpolation of signals filtering causes peak value regeneration, reduces the PAR of carrier signal effect relatively poor.
Summary of the invention
The embodiment of the invention provides a kind of method of selecting the carrier wave rotatable phase, may further comprise the steps:
Extract the employed training sequence code of at least one carrier wave;
The employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave;
Use at least two default rotatable phases, the simulated training sequence code signal of described carrier wave is carried out phase rotating;
Spread training sequence code signal behind the described phase rotating is carried out peak value to be detected;
According to the result of peak value detection, when determining to satisfy the pre-set peak value condition, the employed rotatable phase of described carrier wave.
The embodiment of the invention also provides a kind of carrier wave rotatable phase to determine device, comprising: the training sequence code extraction module is used for extracting employed training sequence code from least one carrier wave; The simulation expansion module is used for the employed training sequence code of described carrier wave is simulated expansion, obtains the simulated training sequence code signal of described carrier wave; The phase rotating module be used for to be used at least two default rotatable phases, and the simulated training sequence code signal of described carrier wave is carried out phase rotating; Peak detection block is used for that the spread training sequence code signal behind the described phase rotating is carried out peak value and detects; Judge module is used for the result according to the peak value detection, when determining to satisfy the pre-set peak value condition, and the employed rotatable phase of described carrier wave.
The embodiment of the invention is providing a kind of system that reduces peak-to-average force ratio, comprises that the carrier wave rotatable phase determines device and phase rotating unit; Wherein, the carrier wave rotatable phase determines that device comprises: the training sequence code extraction module is used for extracting employed training sequence code from least one carrier wave; The simulation expansion module is used for the employed training sequence code of described carrier wave is simulated expansion, obtains the simulated training sequence code signal of described carrier wave; The phase rotating module be used for to be used at least two default rotatable phases, and the simulated training sequence code signal of described carrier wave is carried out phase rotating; Peak detection block is used for that the spread training sequence code signal behind the described phase rotating is carried out peak value and detects; Judge module is used for the result according to the peak value detection, when determining to satisfy the pre-set peak value condition, and the employed rotatable phase of described carrier wave.Described phase rotating unit is used for determining that according to described carrier wave rotatable phase the rotatable phase that device is determined carries out phase rotating to carrier wave.
Method, the Apparatus and system of the selection carrier wave rotatable phase that the embodiment of the invention provides, when preselected carrier wave rotatable phase, by the training sequence code MIDAMBLE code to its use of carrier extract, and the training sequence code that extracts simulated expansion, so that when determining rotatable phase, greatly reduced amount of calculation, reduced computational complexity.
Description of drawings
Fig. 1 is the schematic diagram of prior art TD-SCDMA business time-slot structure;
Fig. 2 is the method flow diagram of selecting the carrier wave rotatable phase in the one embodiment of the invention;
Fig. 3 is the structural representation that the carrier wave rotatable phase is determined device in the another embodiment of the present invention;
Fig. 4 is the structural representation that reduces the system of peak-to-average force ratio in the another embodiment of the present invention; With
Fig. 5 is the structural representation that reduces the system of peak-to-average force ratio in the another embodiment of the present invention.
Embodiment
In order to make those skilled in the art person understand better technical scheme of the present invention, the present invention is described in further detail below in conjunction with the drawings and specific embodiments, but embodiments of the present invention are not limited to this.
As shown in Figure 2, the embodiment of the invention provides a kind of method of selecting the carrier wave rotatable phase, may further comprise the steps:
Step 201: extract the employed training sequence code of at least one carrier wave;
Step 202: the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave;
Step 203: use at least two default rotatable phases, the simulated training sequence code signal of described carrier wave is carried out phase rotating;
Step 204: the spread training sequence code signal behind the described phase rotating is carried out peak value detect;
Step 205: according to the result of peak value detection, when determining to satisfy the pre-set peak value condition, the employed rotatable phase of described carrier wave.
In the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, optimized calculating for the reason that the carrier signal peak-to-average force ratio is high, and when preselected carrier wave rotatable phase, by the training sequence code MIDAMBLE code to its use of carrier extract, and the training sequence code that extracts simulated expansion, so that when determining rotatable phase, greatly reduced amount of calculation, reduced computational complexity.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, the span of at least two default rotatable phases be [0,2 π).
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, comprise step: the simulated training sequence code baseband signal of the training sequence code that extracts being carried out the described carrier wave of stack generation in the carrier wave.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, comprise step: the training sequence code that extracts is carried out the simulated training sequence code signal that interpolation filtering produces described carrier wave.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, comprise step: the training sequence code that extracts is carried out the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
Be appreciated that in different application, the employed training sequence code of described carrier wave simulated spread step can simulate according to actual needs.Can be the combination in any of other application modes such as above-mentioned interior stack, interpolation, filtering, intermediate frequency Modulation such as the simulation expansion.This combination is not limited to the combination examples that the embodiment of the invention provides.
Optionally, in the method for the selection carrier wave rotatable phase that the embodiment of the invention provides, the employed training sequence code of described carrier wave is simulated expansion, obtains the simulated training sequence code signal of described carrier wave, specifically may further comprise the steps:
To the training sequence code MID that extracts
M, nCarry out the simulated training sequence code baseband signal of each carrier wave of stack generation in the carrier wave
Wherein, described at least one carrier wave specifically comprises N carrier wave, and n is the carrier number index, and n=1LN, N are carrier number, and n is the call number of each physical code channel,
To each carrier wave training sequence code baseband signal
Carry out analog interpolation filtering and intermediate frequency Modulation and obtain the simulated training sequence code signal of described carrier wave
Wherein, function h
RRCRepresent X times of interpolation and RRC filtering and process function h
HBRepresent the processing of Y times of interpolation and semi-band filtering, function m represents signal is carried out the intermediate frequency Modulation of a corresponding n frequency, function h
CRepresent the processing of Z times of interpolation and comb filtering, 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 invention provides, according to the result that peak value detects, determine to use the rotatable phase of the corresponding use of described carrier wave institute when satisfying the pre-set peak value condition; May further comprise the steps:
Relatively detect the peak value that obtains, the minimum peak after the acquisition relatively; Here also can select other suitable peak values according to system's needs.
Determine the pre-set peak value condition by: the rotatable phase of the corresponding described carrier wave of minimum peak that above-mentioned steps is determined is as the rotatable phase of described carrier wave institute correspondence use.
The method that is appreciated that the selection carrier wave rotatable phase that the embodiment of the invention proposes optionally is applicable in the TD-SCDMA system.
1, after base station system starts, carry out disposable self adaptation computing, the extraction system parameter calculates the best rotatable phase that is fit to the native system parameter, and records best rotatable phase.
2, extract the best rotatable phase of record, after the normal operation of system, all to each carrier wave time slot baseband signal of the framing of the BBU device output of routine, fixing this best rotatable phase that uses carries out the carrier phase rotation to each time slot.
3, output is processed through each carrier wave time slot baseband signal to the conventional RRU device of carrier phase rotation.
In the step 1 of the inventive method, described extraction system parameter comprises id number, RRU interpolation and the filtering parameter etc. of IF spot that each carrier wave of extraction system uses, basic MIDAMBLE code that each carrier wave uses; The described best rotatable phase that is fit to the native system parameter that calculates also comprises: the basic MIDAMBLE code, RRU interpolated signal and the filtering parameter that utilize the id number of the basic MIDAMBLE code that each carrier wave of extracting in the extraction system parameter uses to extract each carrier wave produce simulation MIDAMBLE signal.
In the TD-SCDMA system, basic MIDAMBLE code has 128, and is pre-stored in system, can extract the basic MIDAMBLE code of its correspondence according to the id number of each carrier wave MIDAMBLE code separately.
In the TD-SCMDA system, the general signal processing mode that adopts BBU to separate with RRU, BBU is only to RRU output time solt baseband signal, and the mode that different RRUs is processed is had nothing in common with each other, when the parameter of RRU interpolation and filtering not simultaneously, the peak value revival that the time slot baseband signal that the postrotational BBU of same process is exported produces should be different, therefore when the time slot baseband signal to BBU output is rotated, should take into full account the parameter of RRU interpolation and filtering, namely when producing simulation MIDAMBLE signal, the parameter of input RRU interpolation and filtering is simulated out with the MIDAMBLE signal fully.
Simulation MIDAMBLE signal can produce in accordance with the following methods: make the basic MIDAMBLE code of each carrier wave be
Wherein n is the carrier number index, and n=1LN, 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=1L M, M are the physical code channel number of carrier wave n.Certainly, also can simulate the non-full physical code channel situation of M＜16.When each carrier wave physical code channel took, peak-to-average force ratio was maximum, and the state when therefore only needing 16 physical code channels of simulation to take fully can simulate the situation of peak-to-average force ratio maximum.
In the present embodiment, adopt the situation of M=16 to be explained.Expansion MIDAMBLE code MID to each carrier wave
M, nCarry out each carrier wave MIDAMBLE baseband signal of stack generation in the carrier wave:
To each carrier wave MIDAMBLE baseband signal
Carry out analog interpolation filtering and intermediate frequency Modulation, the interpolation filtering here and intermediate frequency Modulation should be fully according to the parameter of RRU, so 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, adopt the processing mode of certain RRU to be described, such as baseband signal respectively through 2 times of interpolations, RRC filtering, 4 times of interpolations, semi-band filtering, intermediate frequency Modulation, 6 times of interpolations and combed filter.Make function h
RRC(g) represent 2 times of interpolations and RRC filtering and process function h
HB(g) 4 times of interpolations of expression and semi-band filtering are processed, and the intermediate frequency Modulation of a corresponding n frequency, function h are carried out in function m (g) expression to signal
C(g) 6 times of interpolations of expression and comb filtering are processed.Each carrier wave MIDAMBLE baseband signal is carried out interpolation filtering and intermediate frequency Modulation produces each carrier wave simulation MIDAMBLE signal:
In the present embodiment, in the step 1 of the inventive method, the described best rotatable phase that is fit to the native system parameter that calculates also comprises all possible rotatable phase combinations that generate corresponding to each carrier wave, uses respectively each combination successively to each carrier wave simulation MIDAMBLE signal
Carry out the carrier wave rotation, each carrier wave simulation MIDAMBLE signal after the postrotational rotation is carried out peak value detect and produce some peak values.
In the present embodiment, in the step 1 of the inventive method, the described best rotatable phase that is fit to the native system parameter that calculates, also comprise above-mentioned some peak values are compared, with the rotatable phase of corresponding each carrier wave of minimum peak as result of calculation (being the best rotatable phase of each carrier wave).
In the step 2 of the inventive method, comprise step:
21, extract each carrier wave time slot baseband signal of framing and the best rotatable phase of each carrier wave.
22, each time slot all carries out the carrier phase rotation to fixing this best rotatable phase that uses of each carrier wave time slot baseband signal of framing.
Each carrier wave time slot baseband signal of framing in the above-mentioned steps 21 is exported by the BBU of system.The best rotatable phase of each carrier wave is the best rotatable phase of each carrier wave that produces in the above-mentioned steps 2.
In the step 3 of the inventive method, comprise step:
31, each the carrier wave time slot baseband signal through phase rotating is carried out interpolation filtering.
32, each the carrier wave time slot baseband signal through interpolation filtering is carried out RRC filtering.
33, to carrying out further interpolation filtering through each carrier wave time slot baseband signal of RRC filtering.
34, close the road to carrying out carrier wave through each carrier wave time slot baseband signal of further interpolation filtering.
As shown in Figure 3, the embodiment of the invention also provides a kind of carrier wave rotatable phase to determine device 300, comprises training sequence code extraction module 301, simulation expansion module 302, phase rotating module 303, peak detection block 304, judge module 305.Wherein, training sequence code extraction module 301 is used for extracting employed training sequence code from least one carrier wave; Simulation expansion module 302 is used for the training sequence code that training sequence code extraction module 301 extracts is simulated expansion, obtains the simulated training sequence code signal of described carrier wave; Phase rotating module 303 is used for using at least two default rotatable phases, and the simulated training sequence code signal that simulation expansion module 302 is obtained carries out phase rotating, the postrotational spread training sequence code of output phase signal; Peak detection block 304 is used for carrying out peak value according to the spread training sequence code signal behind the phase rotating of phase rotating module 303 outputs and detects; The peak value testing result that judge module 305 is used for according to phase rotating module 303, when determining to satisfy the pre-set peak value condition, the employed rotatable phase of described carrier wave.The carrier wave rotatable phase that the embodiment of the invention provides is determined device, training sequence code MIDAMBLE by 301 pairs of its uses of carrier extract of training sequence code extraction module, the reason that MIDAMBLE causes so that in the phase place pre-rotation, taken into full account the generation of peak-to-average force ratio, and then so that simulation expansion module 302 has greatly reduced amount of calculation when the simulation expansion, reduced computational complexity.
Optionally, at least two rotatable phases that phase rotating module 303 is default, and the span of described at least two rotatable phases be [0,2 π).
Optionally, simulation expansion module 302 is used for the training sequence code that extracts is carried out superposeing in the carrier wave, to produce the simulated training sequence code baseband signal of described carrier wave.
Optionally, simulation expansion module 302 is used for the training sequence code that extracts is carried out interpolation filtering, to produce the simulated training sequence code signal of described carrier wave.
Optionally, simulation expansion module 302 is used for the training sequence code that extracts is carried out the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
Optionally, simulation expansion module 302 is used for the training sequence code MID to described training sequence code extraction
M, nCarry out the simulated training sequence code baseband signal of each carrier wave of stack generation in the carrier wave
Wherein, described at least one carrier wave specifically comprises N carrier wave, and n is the carrier number index, and n=1L N, N are carrier number, and n is the call number of each physical code channel,
To each carrier wave training sequence code baseband signal
Carry out analog interpolation filtering and intermediate frequency Modulation and obtain the simulated training sequence code signal of described carrier wave
Wherein, function h
RRCRepresent X times of interpolation and RRC filtering and process function h
HBRepresent the processing of Y times of interpolation and semi-band filtering, function m represents signal is carried out the intermediate frequency Modulation of a corresponding n frequency, function h
CRepresent the processing of Z times of interpolation and comb filtering, X, Y, Z are natural number.Optionally, X=2, Y=4, Z=6.
Optionally, the judge module 305 concrete peak value that relatively detection obtains, the minimum peak after the acquisition relatively of being used for; With the rotatable phase of the corresponding described carrier wave of minimum peak as described carrier wave the corresponding rotatable phase that uses.
See also Fig. 4, the embodiment of the invention also provides a kind of and determines that with the carrier wave rotatable phase device 300 reduces the reduction peak-to-average force ratio system 400 of system peak-to-average ratio, comprises that the carrier wave rotatable phase determines device 300 and phase rotating unit 500; Wherein phase rotating unit 500 is used for determining that according to described carrier wave rotatable phase the rotatable phase that device is determined carries out phase rotating to carrier wave.Be appreciated that here phase rotating unit 500 and phase rotating module 303 public cover systems, Cost reduction.
Wherein, the carrier wave rotatable phase is determined device 300, comprises training sequence code extraction module 301, simulation expansion module 302, phase rotating module 303, peak detection block 304, judge module 305.Wherein, training sequence code extraction module 301 is used for extracting employed training sequence code from least one carrier wave; Simulation expansion module 302 is used for the training sequence code that training sequence code extraction module 301 extracts is simulated expansion, obtains the simulated training sequence code signal of described carrier wave; Phase rotating module 303 is used for using at least two default rotatable phases, and the simulated training sequence code signal that simulation expansion module 302 is obtained carries out phase rotating, the postrotational spread training sequence code of output phase signal; Peak detection block 304 is used for carrying out peak value according to the spread training sequence code signal behind the phase rotating of phase rotating module 303 outputs and detects; The peak value testing result that judge module 305 is used for according to phase rotating module 303, when determining to satisfy the pre-set peak value condition, the employed rotatable phase of described carrier wave.The carrier wave rotatable phase that the embodiment of the invention provides is determined device, training sequence code MIDAMBLE by 301 pairs of its uses of carrier extract of training sequence code extraction module, the reason that MIDAMBLE causes so that in the phase place pre-rotation, taken into full account the generation of peak-to-average force ratio, and then so that simulation expansion module 302 has greatly reduced amount of calculation when the simulation expansion, reduced 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 that connects successively, reduction peak-to-average force ratio module 620 and RRU module 630.Best rotatable phase generation module 610 is used for carrying out disposable self adaptation computing after base station system starts, and calculates the best rotatable phase that is fit to the native system parameter; Reduce peak-to-average force ratio module 620, be used for extracting the good best rotatable phase of record, after the normal operation of system, all to each carrier wave time slot baseband signal of the framing of the Base Band Unit Base Band Unit (hereinafter to be referred as BBU) of routine output, fixing this best rotatable phase that uses carries out the carrier phase rotation to each time slot; Remote Radio Unit Radio Remote Unit (hereinafter to be referred as RRU) 630 is used for output and carries out follow-up routine operation through the extremely conventional RRU device of each carrier wave time slot baseband signal of phase rotating.
In the 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 is used for id number, RRU interpolation and the filtering parameter etc. of IF spot that each carrier wave of extraction system uses, basic MIDAMBLE code that each carrier wave uses; Described carrier phase generation module 613 is used for generating all the possible rotatable phase combinations corresponding to each carrier wave; Described best rotatable phase computing module 611, basic MIDAMBLE code, RRU interpolation and filtering parameter that the id number of the basic MIDAMBLE code that each carrier wave that is used for utilizing the system parameters extraction module to extract is used extracts each carrier wave produce simulation MIDAMBLE signal.
Further, above-mentioned best rotatable phase computing module 611, also be used for extracting all the possible rotatable phase combinations corresponding to each carrier wave that generate in advance from the carrier phase generation module, use respectively each rotatable phase combination to carry out the carrier wave rotation to simulating original MIDAMBLE signal successively, MIDAMBLE signal after the postrotational simulation rotation is closed the road, produce simulation and close road MIDAMBLE signal, road MIDAMBLE signal is closed in simulation carry out the peak value detection and produce some peak values.
Further, above-mentioned best rotatable phase computing module 611 also is used for above-mentioned some peak values are compared, with the rotatable phase of corresponding each carrier wave of minimum peak as result of calculation (being 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 rotating module 622 that is connected with best rotatable phase extraction module with the time slot baseband signal.Described time slot baseband signal and best rotatable phase extraction module 621 is used for extracting and reduces peak-to-average force ratio module each carrier wave time slot baseband signal of framing and the best rotatable phase of each carrier wave.Described phase rotating module 622 is used for all fixing this best rotatable phase that uses of each carrier wave time slot baseband signal of framing being carried out the carrier phase rotation at each time slot.
In the described RRU module 630, also be used for each the carrier wave time slot baseband signal through phase rotating is carried out interpolation filtering, each carrier wave time slot baseband signal through interpolation filtering is carried out RRC filtering, to carrying out further interpolation filtering through each carrier wave time slot baseband signal of RRC filtering, close the road to carrying out carrier wave through each carrier wave time slot baseband signal of further interpolation filtering.
Described carrier phase generation module 613 hardware memory of some combination carrier phase observations that can be pre-stored also can be the computing module that calculates in real time carrier phase.In embodiments of the present invention, save hardware space for further, and in system boot, allow to carry out the calculating of one period long period, therefore adopted the computing module of real-time calculating carrier phase as the carrier phase generation module.No matter take pre-stored or the mode of real-time calculating, do not limit owing to producing corresponding to the method for all possible rotatable phases combinations of each carrier wave, carrier wave rotatable phase size is not limit, the rotatable phase span of each carrier wave be [0,2 π).In theory, the generation described in the present invention is unlimited many groups corresponding to the group number of all possible rotatable phase combinations of each carrier wave.Because physical constraints gets final product so only need produce the carrier wave rotatable phase of some.In embodiments of the present invention, allow to carry out the calculating of one period long period when beginning owing to system, therefore can produce more carrier wave rotatable phase combination such as random phase, low correlation sequence phase etc. according to certain rule, reinforcement reduces the effect of peak-to-average force ratio.
Because 0 and the particularity of π, carry out 0 and during the phase rotating of π, each carrier wave base band time slot signal phase rotating module specific implementation will significantly be simplified.When certain carrier wave base band time slot signal carried out 0 phase rotating, the base band time slot signal of this carrier wave directly remained unchanged and can realize; When certain carrier wave base band time slot signal carried out the π phase rotating, the base band time slot signal of this carrier wave was directly got negative value and can be realized.Therefore the carrier phase generation module of the present embodiment produces the arrangement of the corresponding respectively correspondence 0 of each carrier wave and two kinds of phase places of π.If carrier number N=3, common property is given birth to 8 groups of combination carrier phase observations; If carrier number N=6, common property is given birth to 64 groups of combination carrier phase observations; If carrier number N=9, common property is given birth to 512 groups of combination carrier phase observations.
Each the carrier wave simulation MIDAMBLE signal that produces carried out conventional interpolation filtering and intermediate frequency Modulation by each carrier wave MIDAMBLE baseband signal
Utilize successively some groups of combination carrier phase observations of above-mentioned generation to carry out the carrier wave rotation and superpose closing the road, produce corresponding some groups simulation and close road MIDAMBLE signal.The peak value that road MIDAMBLE signal carries out respectively the signal mode value is closed in some groups simulation ask for, produce corresponding some groups peak value.Be each group combination carrier phase observation, all the peak value of road MIDAMBLE signal mode value is closed in corresponding simulation.
Can find out, the embodiment of the invention is when arranging net in the base station, extract the employed frequency of fixed TD-SCDMA each carrier wave of system, carry out in advance the employed MIDAMBLE code of each carrier wave of disposable analysis and carry out the analog carrier rotation, intermediate frequency Modulation, fully the peak value after interpolation filtering and the stack generates situation, calculate carrier wave rotatable phase optimum under the corresponding current frequency, and use this optimum carrier wave anglec of rotation to be fixing simple carrier wave rotatable phase, avoided each time slot will repeat that all whole time slot data are carried out a large amount of traversal computings and reduced system throughput and significantly increase system hardware resources consumption.System is behind actual motion, need only carry out simple carrier wave rotation, need not increase the calculating of any complexity, fundamentally do not affect system real time, need not increase hardware consumption how, guarantee simultaneously to suppress each carrier wave baseband signal intermediate frequency Modulation and closed the peak-peak that the MIDAMBLE code produces behind the road, effectively reduced peak-to-average force ratio.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. method of selecting the carrier wave rotatable phase is characterized in that: may further comprise the steps:
Extract the employed training sequence code of at least one carrier wave;
The employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave;
Use at least two default rotatable phases, the simulated training sequence code signal of described carrier wave is carried out phase rotating;
Spread training sequence code signal behind the described phase rotating is carried out peak value to be detected;
According to the result of peak value detection, when determining to satisfy the pre-set peak value condition, the employed rotatable phase of described carrier wave.
2. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that:
The span of at least two default rotatable phases be [0,2 π).
3. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that: the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, may further comprise the steps:
The training sequence code that extracts is carried out the simulated training sequence code baseband signal of the described carrier wave of stack generation in the carrier wave.
4. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that: the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, may further comprise the steps:
The training sequence code that extracts is carried out the simulated training sequence code signal that interpolation filtering produces described carrier wave.
5. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that: the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, may further comprise the steps:
The training sequence code that extracts is carried out the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
6. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that: the employed training sequence code of described carrier wave is simulated expansion, obtain the simulated training sequence code signal of described carrier wave, may further comprise the steps:
To the training sequence code MID that extracts
M, nCarry out the simulated training sequence code baseband signal of each carrier wave of stack generation in the carrier wave
Wherein, described at least one carrier wave specifically comprises N carrier wave, and n is the carrier number index, and n=1L N, N are carrier number, and n is the call number of each physical code channel,
To each carrier wave training sequence code baseband signal
Carry out analog interpolation filtering and intermediate frequency Modulation and obtain the simulated training sequence code signal of described carrier wave
Wherein, function h
RRCRepresent X times of interpolation and RRC filtering and process function h
HBRepresent the processing of Y times of interpolation and semi-band filtering, function m represents signal is carried out the intermediate frequency Modulation of a corresponding n frequency, function h
CRepresent the processing of Z times of interpolation and comb filtering, X, Y, Z are natural number.
7. the method for selection carrier wave rotatable phase as claimed in claim 1 is characterized in that: according to the result that peak value detects, determine to use the rotatable phase of the corresponding use of described carrier wave institute when satisfying the pre-set peak value condition; May further comprise the steps:
Relatively detect the peak value that obtains, the minimum peak after the acquisition relatively;
Determine the pre-set peak value condition by: with the rotatable phase of the corresponding described carrier wave of minimum peak as described carrier wave the rotatable phase that uses of correspondence.
8. a carrier wave rotatable phase is determined device, it is characterized in that, comprising:
The training sequence code extraction module is used for extracting employed training sequence code from least one carrier wave;
The simulation expansion module is used for the employed training sequence code of described carrier wave is simulated expansion, obtains the simulated training sequence code signal of described carrier wave;
The phase rotating module be used for to be used at least two default rotatable phases, and the simulated training sequence code signal of described carrier wave is carried out phase rotating;
Peak detection block is used for that the spread training sequence code signal behind the described phase rotating is carried out peak value and detects;
Judge module is used for the result according to the peak value detection, when determining to satisfy the pre-set peak value condition, and the employed rotatable phase of described carrier wave.
9. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that:
At least two rotatable phases that described phase rotating module is default, and the span of described at least two rotatable phases be [0,2 π).
10. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that: described simulation expansion module specifically is used for the training sequence code that extracts is carried out superposeing in the carrier wave, to produce the simulated training sequence code baseband signal of described carrier wave.
11. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that: described simulation expansion module specifically is used for the training sequence code that extracts is carried out interpolation filtering, to produce the simulated training sequence code signal of described carrier wave.
12. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that: described simulation expansion module specifically is used for the training sequence code that extracts is carried out the simulated training sequence code signal that intermediate frequency Modulation produces described carrier wave.
13. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that: described simulation expansion module specifically is used for the training sequence code MID to described training sequence code extraction
M, nCarry out the simulated training sequence code baseband signal of each carrier wave of stack generation in the carrier wave
Wherein, described at least one carrier wave specifically comprises N carrier wave, and n is the carrier number index, and n=1L N, N are carrier number, and n is the call number of each physical code channel,
To each carrier wave training sequence code baseband signal
Carry out analog interpolation filtering and intermediate frequency Modulation and obtain the simulated training sequence code signal of described carrier wave
Wherein, function h
RRCRepresent X times of interpolation and RRC filtering and process function h
HBRepresent the processing of Y times of interpolation and semi-band filtering, function m represents signal is carried out the intermediate frequency Modulation of a corresponding n frequency, function h
CRepresent the processing of Z times of interpolation and comb filtering, X, Y, Z are natural number.
14. carrier wave rotatable phase as claimed in claim 8 is determined device, it is characterized in that: described judge module specifically is used for relatively detecting the peak value that obtains, the minimum peak after the acquisition relatively; With the rotatable phase of the corresponding described carrier wave of minimum peak as described carrier wave the corresponding rotatable phase that uses.
15. a system that reduces peak-to-average force ratio is characterized in that: comprise such as the described carrier wave rotatable phase of claim 8-15 and determine device and phase rotating unit;
Wherein, described phase rotating unit is used for determining that according to described carrier wave rotatable phase the rotatable phase that device is determined carries out phase rotating to carrier wave.
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