CN1866944A - Peak-to-average power ratio optimizing process and apparatus - Google Patents
Peak-to-average power ratio optimizing process and apparatus Download PDFInfo
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Abstract
The invention relates to a method for optimizing peak-valley ratio and relative device. Wherein, said method comprises: recognizing the type of transmitted signal, to generate relative peak counteract impulse; layering said peak counteract impulse and the transmitted signal to be output. The invention can improve the maximum sending power and efficiency of sending device and improve the low-level modulation, etc. The invention improves the cover range in low-level modulation method. And it can be used in time division communication system.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of method and device of peak-to-average power ratio optimizing.
Background technology
Orthogonal frequency division multiplexi (OFDM) is an important technology that is applied in the communication system, its main thought is that the channel with assignment is divided into many orthogonal sub-channels, on each subchannel, carry out narrowband modulation and transmission, make the correlation bandwidth of signal bandwidth less than channel.OFDM has fairly obvious advantage, as can effectively overcoming intersymbol interference (ISI), is applicable to the high speed data transfer in multi-path environment and the fading channel; By the combined coding of each subcarrier, has very strong anti-ageing ability; Can select OFDM implementation method for use based on IFFT/FFT; Channel utilization is very high, and this point is particularly important in frequency spectrum resource limited wireless environment; When the subcarrier number was very big, the availability of frequency spectrum of system was tending towards 2Baud/Hz.
Plurality of advantages in view of orthogonal frequency division multiplexi, this technology should be widely used in the signal transmission, but when the signal of high peak-to-average ratio (PAR) passes through power amplifier, nonlinear distortion and spectral re-growth for fear of signal, need power amplifier to have the big range of linearity, make power amplifier that bigger rollback be arranged, but this can cause power amplification efficiency lower, the energy consumption and the cost height of unit power output.
For the problems referred to above, the power amplifier input signal is carried out the efficient that peak-to-average ratio suppresses to improve power amplifier design, therefore reducing the peak-to-average ratio that transmits is a key issue using the OFDM technology.
Prior art realizes based on signal predistortion technology the inhibition method of signal peak-to-average ratio, promptly produces the peak value that the peak value offset pulse reduces signal, reduces the signal peak-to-average ratio.
But because transmission signals may adopt different modulation, type of coding, and prior art is not distinguished modulation, the type of coding of signal when signal is handled, and all signals are adopted identical processing method.
In ofdm system, system supports multiple modulation system simultaneously, comprise binary phase shift keying (BPSK), orthogonal PSK (QPSK), quadrature amplitude modulation (16QAM), high-order orthogonal amplitude modulation(PAM) (64QAM) etc., can also support the coding of multiple speed; The physical layer of system disposes corresponding modulation coding mode according to high-rise configuration of system and factors such as channel, business characteristic, is that unit forms signal segment (Burst) data flow with symbol.In some protocol specifications, as 802.16d, each signal segment is selected a kind of modulation coding mode for use, the modulation coding mode difference of the employing of different signal segment signals, and the demand on signal quality of unlike signal segment signal is also inequality.
If the above-mentioned multiple signal that transmits in ofdm system is used prior art, the method for do not distinguish signal type, all signals being carried out same treatment then can not realize effective peak-to-average ratio of all signals is suppressed.For example, when high order modulation, high-rate coded signal and low-order-modulated signal transmit simultaneously, because high order modulation signal is to waveform quality demand height, the surplus of leaving the processing of predistortion slicing for is little, if employed prior art can reduce high order modulation and high-order rate coding signal peak-to-average ratio, then for the low-order-modulated signal, the optimization of its peak-to-average ratio and power amplifier power also reaches optimum state far away.
Summary of the invention
In view of above-mentioned existing in prior technology problem, purpose of the present invention provides a kind of can carry out peak-to-average power ratio optimizing method and device to signal with different type simultaneously.
The objective of the invention is to be achieved through the following technical solutions:
A kind of peak-to-average power ratio optimizing method comprises:
The type of A, identification transmission signals produces the corresponding peaks cancellation pulses respectively according to dissimilar transmission signals;
B, with described peak value offset pulse and transmission signals stack output.
Before described steps A, also comprise:
P1, be that transmission signals adds synchronous signal type identification mark;
The type of the transmission signals of identification described in the steps A is finished by detected transmission signal classification logotype.
Before described steps A, also comprise:
P2, dissimilar transmission signals is carried out the transmitted power adjustment;
The type of the transmission signals of identification described in the steps A is by the transmitted power identification transmission of signal-type to transmission signals.
Described type detection to transmission signals comprises that the live signal modulation type detects, the live signal type of coding detects, and described detection is that least unit is carried out with the data symbol in the signal segment.
Before or after described peak value offset pulse and transmission signals overlap-add procedure, transmission signals is carried out the power adjustment; Or after base band is earlier adjusted the power of transmission signals again with its transmission.
Transmission signals before the described overlap-add procedure or after the overlap-add procedure being carried out the amplitude of power adjustment determines by the bigoted factor list query of the power that carries out according to transmission of signal-type.
Before described peak value offset pulse and the superimposed processing of transmission signals, need carry out the synchronous detecting and the adjustment of peak value offset pulse and transmission signals.
The processing that described generation peak value offset pulse reduces the signal peak-to-average ratio needs to carry out in conjunction with the variable Rate Filtering Processing to transmission signals.
Described variable Rate Filtering Processing to transmission signals is realized jointly that by variable Rate filter bank and upconverter the peak value offset pulse produces and carries out before or after signal enters filter bank or in the process with the process of transmission signals stack.
Described peak value offset pulse comprises:
Single-stage peak-to-average ratio cancellation pulses or multistage peak-to-average ratio cancellation pulses;
It is according to the tabulation of transmission of signal-type single inquiry slicing thresholding that described single-stage peak value offset pulse produces, and obtains single-stage slicing thresholding configuration parameter; According to single-stage slicing thresholding configuration parameter transmission signals is carried out single treatment, the peak value that exceeds thresholding is carried out Filtering Processing, and produce single-stage peak value offset pulse and transmission signals and carry out single-stage and superpose and obtain;
The generation of multistage peak value offset pulse is to inquire about multistage slicing thresholding tabulation according to the transmission of signal-type testing result, obtains multistage slicing thresholding configuration parameter; According to multistage slicing thresholding configuration parameter transmission signals is carried out multistage peak value offset and handle, the transmission signals peak value that exceeds thresholdings at different levels is carried out Filtering Processing, produce multistage peak value offset pulse and transmission signals and carry out multi-stage superimposed and obtain; Separate configurations is supported in multistage slicing thresholding tabulation, or supports unified configuration.
Also comprise in described single-stage stack: use the method for the reduction peak-to-average ratio that does not worsen signal quality to realize that jointly peak-to-average ratio suppresses before the pulse of generation peak value offset, the described method that does not worsen the reduction peak-to-average ratio of signal quality comprises based on the selection mapping method of symbol processing, keeps subcarrier method, symbol scrambling reduction peak-to-average ratio method.
Also need noise extraction in the described multistage peak value offset processing procedure, and, identical filter processing method and noise extraction method adopted in the peak value offset processing procedures at different levels.
In described multi-stage superimposed processing procedure, one or many uses the method for the reduction peak-to-average ratio that does not worsen signal quality to realize that jointly peak-to-average ratio suppresses before the pulse of first order peak value offset produces or between the additive process of peak value offset pulse at different levels and transmission signals.
The described method that other do not worsen the reduction peak-to-average ratio of signal modulation quality comprises that selection mapping method, reservation subcarrier TR method, the symbol scrambling handled based on symbol reduce peak-to-average ratio method etc.
A kind of peak-to-average power ratio optimizing device comprises:
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter;
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
Also comprise:
The peak-to-average ratio that does not worsen quality suppresses module, is connected with described signal type detection module, is used for before producing the peak value offset pulse according to signal type peak-to-average ratio being suppressed.
Described peak-to-average ratio suppresses module and comprises:
The peak value offset pulse produces submodule, according to the pulse of the corresponding generation of slicing thresholding configuration parameter peak value offset, when tabulation obtained multistage slicing threshold parameter according to multistage slicing thresholding, peak value offset pulse of every grade of corresponding input of parameter produced submodule, produces multistage peak value offset pulse;
The stack submodule carries out synchronous regime to transmission signals and peak value offset pulse and detects and adjust, when transmission signals and peak value offset impulsive synchronization with transmission signals and peak value offset superimposed pulses.
Described peak-to-average ratio suppresses module and also comprises:
Cache sub-module is carried out buffer memory to transmission signals before peak value offset pulse and transmission signals superpose;
Power adjustment submodule is inquired about the tabulation of the power bias factor according to modulation type, the type of coding of transmission signals and is obtained the power bias factor, the power of adjustment transmission signals before transmission signals and peak value offset superimposed pulses or after the stack.
A kind of OFDM transmitter, comprise base band Fourier transform module, D/A converter module, comprise by a plurality of filters form frequency conversion filter bank and digital frequency conversion module, it is characterized in that, between base band Fourier transform module and D/A converter module, also comprise the peak-to-average power ratio optimizing module
Described peak-to-average power ratio optimizing module is used to discern different transmission signals classifications, and carries out peak-to-average ratio respectively according to different transmission signals classifications and suppress.
Described peak-to-average power ratio optimizing module further comprises;
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
Described peak-to-average power ratio optimizing module is connected between each filter of variable Rate filter bank; Or be connected between variable Rate filter bank and the digital frequency conversion module; Or be connected between digital frequency conversion module and the D/A converter module.
As seen from the above technical solution provided by the invention, the present invention improves the maximum transmission power and the efficient of transmitter power amplifier, improve the peak-to-average ratio and the power of low exponent number modulation, coded data, improve corresponding power amplifier peak power output, the power consumption of reduction equipment, strengthen the coverage under the communication system employing low order code modulation mode, be beneficial to system network planning and optimization; Can be used for supporting the time division communication system of multiple modulation, have system suitability widely.
Description of drawings
Figure 1 shows that the realization position view of the embodiment of the invention one in transmitter;
Figure 2 shows that the embodiment of the invention two promotes signal power earlier and re-uses the schematic diagram that the peak-to-average ratio inhibition is carried out in the pulse of single-stage peak value offset;
Figure 3 shows that the embodiment of the invention three elder generations use unimodal value cancellation pulses to carry out the schematic diagram that peak-to-average ratio suppresses to promote signal power again;
Figure 4 shows that the schematic diagram that the embodiment of the invention four uses two-stage peak value offset pulse carrying out peak-to-average ratio to suppress;
Figure 5 shows that the embodiment of the invention five suppresses the schematic diagram of peak-to-average ratio jointly in conjunction with other methods that do not worsen the reduction peak-to-average ratio of signal modulation quality.
Figure 6 shows that the device schematic diagram of the embodiment of the invention 6.
Embodiment
Core of the present invention is that the signal in every segment signal section of transmitting with different modulating, coding mode is modulated and coded system identification, after inverse fast Fourier transform (IFFT), modulation and the coded system different according to signal in each signal segment, inquire about corresponding slicing thresholding tabulation, producing peak value offset pulse and transmission signals superposes, in many, under the situation of modulating-coding type coexistence peak-to-average ratio is fully optimized, made maximum transmission power and the efficient of transmitter power amplifier under all kind of modulations coded data condition high as far as possible.
More specifically say, the present invention is after the base band inverse fast Fourier transform (IFFT) of OFDM transmitter is handled, increase peak-to-average ratio before and suppress module carrying out digital-to-analogue conversion (DAC), be used for signal to different modulation and coded system have at inquiry of slicing thresholding configuration parameter and power adjustment, it is superimposed to produce peak value offset pulse and transmission signals, effectively reduce the peak-to-average ratio of signal, export suitable power.
Need before carrying out the peak-to-average ratio inhibition, carry out modulation system and coded system identification among the present invention to different signal segments, so that peak-to-average ratio suppresses module and according to the concrete modulation and the coded system of signal signal carried out respective handling, be that least unit is carried out with the data symbol in the signal segment to the real-time detection of transmission signals.
For modulation, the type of coding that can identify transmission signals, when sending transmission signals, need to send and synchronous coding and the modulation signature information of transmission signals simultaneously, system determines modulation, the type of coding of transmission signals by the identification to this information.
The method of transmission signals being carried out type identification includes but not limited to:
For transmission signals adds synchronous signal type identification mark;
The type of described identification transmission signals is finished by detected transmission signal classification logotype.
Dissimilar transmission signals is carried out the transmitted power adjustment;
The type of described identification transmission signals is by the transmitted power identification transmission of signal-type to transmission signals.
Under Adaptive Modulation and Coding, peak-to-average ratio suppress module after the modulation of picked up signal and coded system information by consulting the suitable slicing thresholding configuration parameter of slicing thresholding list configuration; After obtaining suitable slicing thresholding configuration parameter, the module that suppresses peak-to-average ratio disposes according to threshold parameter carries out Filtering Processing to the peak value that exceeds thresholding, produce suitable counteracting peak pulse, the peakedness ratio that reduces transmission signals makes it satisfy the requirement of ofdm system.
Realization position to the allocating power biasing of tabling look-up of signal with different type section both can realize before slicing, and the link link that also can be placed on behind the slicing realizes.In system employs, the power bias of the configuration different coding modulation type signal segment of tabling look-up also can directly be realized when base band signalization segment data power.
Use peak-to-average ratio of the present invention suppresses the method that module reduces peak-to-average ratio and comprises: use the peak-to-average ratio of single peak value cancellation pulses to suppress that peak-to-average ratio that module suppresses, uses multistage peak value offset pulse suppresses that module suppresses, comprehensive peak-to-average ratio suppresses module and suppress peak-to-average ratio jointly as the additive method of TR method.
Below in conjunction with the specific embodiment of the invention accompanying drawing the present invention is elaborated.
Figure 1 shows that the realization position view of the embodiment of the invention one in transmitter.
Described is to carry out after the baseband signal transmission process, before the digital-to-analogue conversion to the peak-to-average ratio process of inhibition.
The optimization of transmission signals peak-to-average ratio is promptly suppressed peak-to-average ratio need be wanted to combine with the variable Rate Filtering Processing.
Described variable Rate Filtering Processing to transmission signals is realized jointly by variable Rate filter bank and upconverter, the peak value offset pulse produces and can carry out before signal enters filter bank with the process of transmission signals stack, or after signal output filter bank, carry out, or in filter bank, carry out between each filter of cascade mutually.
Figure 2 shows that the embodiment of the invention two promotes signal power earlier and re-uses the schematic diagram that the peak-to-average ratio inhibition is carried out in the pulse of single-stage peak value offset.
As shown in Figure 2, the embodiment of the invention two promotes signal powers earlier and re-uses the pulse of single-stage peak value offset and carry out the flow process that peak-to-average ratio suppresses and comprise:
Step 11, the transmission signals that will need to suppress the signal peak-to-average ratio are modulated, coded system detects.
In the ofdm system of Adaptive Modulation and Coding, different signal segment (Burst) can adopt different modulation, coded system.Every segment signal is made up of several data symbols (Symbol) and the concrete quantity of data symbol can be provided with, therefore be that least unit detects when becoming segment signal to detect, obtain real-time modulation, the coded message of each data symbol with data symbol (Symbol).
Step 12, dispose suitable slicing thresholding configuration parameter for signal segment according to the live signal modulation that obtains, the tabulation of coding type information inquiry slicing thresholding.
Because modulation, coded system that transmission signals may adopt are more, as long as but can determine that its certain concrete modulation, coded system just can go out corresponding thresholding configuration according to existing slicing thresholding list query.
Table 1 is depicted as the corresponding slicing thresholding tabulation under some code rate of several modulation systems, just can corresponding following table after determining modulation system finds the slicing thresholding configuration parameter under certain code rate.
Type Type | Modulation type Modulation | Code rate Coding Rate | EVM(%) | The power bias table | Slicing thresholding table | Output PAR (dB) | Power output promotes (dB) |
1 | QAM64 | 3/4 | 7% | 1024 | 1024 | 8.0 | 0.0 |
2 | QAM64 | 2/3 | 1.2% | 1085 | 1024 | 7.6 | 0.5 |
3 | QAM16 | 3/4 | 1.8% | 1149 | 1024 | 7.2 | 1.0 |
4 | QAM16 | 1/2 | 2.5% | 1217 | 1024 | 6.7 | 1.5 |
5 | QPSK | 3/4 | 3.3% | 1289 | 1024 | 6.3 | 1.9 |
6 | QPSK | 1/2 | 5.0% | 1446 | 1024 | 5.6 | 2.7 |
7 | BPSK | 1/2 | 5.8% | 1515 | 1024 | 5.2 | 3.0 |
Table 1: several modulation systems corresponding slicing thresholding under some code rate is tabulated
Slicing thresholding configuration parameter in the last table determines jointly that by modulation system and two indexs of code rate every kind of modulation system has different slicing thresholding configuration parameters under different code rates.Be optimized after parameter in final definite need reference table of slicing thresholding configuration parameter and coupling system platform and performance index demand are converted in proportion and draw.
The real-time slicing thresholding configuration parameter at unlike signal of gained is used for generator and produces the peak value offset pulse, in addition, also needs with reference to this slicing thresholding configuration parameter during the tabulation of the inquiry power bias factor.
Step 13, according to the real-time modulation that obtains, coded message and slicing thresholding configuration parameter by tabling look-up and obtaining, the tabulation of the inquiry power bias factor obtains the power bias value of signal under certain code rate of various modulation, type of coding.
Step 14, according to the power bias factor of the different coding modulation signal section numerical value of tabling look-up, according to the power bias factor amplitude that numerical value determines that power is adjusted of tabling look-up, and then adjust the power of different coding, modulation signal, promote less peak-to-average ratio signal power, the power amplifier power output that it is satisfied under the different coding modulation signal waveform quality requirement condition is big as far as possible.Transmission signals through the overpower adjustment is divided into two-way, and one tunnel input data buffer carries out buffer memory, another road input peak value offset pulse generator.
The power adjustment of a pair of transmission signals of the embodiment of the invention is carried out before transmission signals and peak value offset pulse superpose, and the present invention also can carry out after transmission signals and peak value offset superimposed pulses the power adjustment of transmission signals.
Step 15, peak value offset pulse generator carry out Filtering Processing according to the slicing thresholding to the peak value that the transmission signals through the overpower adjustment exceeds thresholding, produce suitable peak value offset pulse, the peak value offset pulse that is produced requires needs to meet certain time domain and frequency domain limited characteristic according to the different system characteristic.
The transmission signals of step 16, process metadata cache superposes with offsetting peak pulse, realizes the inhibition to the signal peak-to-average ratio.Transmission signals with offset the peak pulse stack before, need carry out signal Synchronization and detect, if any asynchrony phenomenon, just can superpose after need being adjusted into synchronously.
Because the single-stage slicing is limited to the effect that suppresses peak-to-average ratio, the present invention can also use multistage peak value offset pulse to carry out peak-to-average ratio and suppress except using the pulse of single-stage peak value offset.
Described peak-to-average ratio suppresses can be before the variable Rate filter bank, afterwards, or between the dual stage filter of cascade mutually, carry out.
Figure 3 shows that the embodiment of the invention three elder generations use unimodal value cancellation pulses to carry out the schematic diagram that peak-to-average ratio suppresses to promote signal power again.
As shown in Figure 3, the embodiment of the invention three is similar to the processing procedure of embodiment two, at first all need signal is detected in real time, and obtain suitable slicing thresholding configuration parameter and power bias parameter value by tabling look-up according to testing result, produce the peak value offset pulse respectively and determine according to slicing thresholding configuration parameter and power bias parameter value transmission signals is carried out the amplitude that power is adjusted.
The embodiment of the invention three is close with the operation principle of embodiment two, and its difference is:
The embodiment of the invention three produces the peak value offset pulse earlier after obtaining slicing thresholding configuration parameter, and it is peak value offset pulse and transmission signals is superimposed, carrying out peak value offset handles, the peak-to-average ratio that suppresses transmission signals, after suppressing peak-to-average ratio again, the power bias parameter value that obtains according to tabling look-up carries out the power adjustment to the signal that suppresses through peak-to-average ratio; Though and also produce the peak value offset pulse among the embodiment two according to the slicing thresholding configuration parameter that obtains, but do not superpose with transmission signals immediately, but adjust the not power of superposed transmission signal according to the power bias parameter value that obtains of tabling look-up, after getting a promotion, power carrying out the peak-to-average ratio inhibition.
Figure 4 shows that the schematic diagram that the embodiment of the invention four uses two-stage peak value offset pulse carrying out peak-to-average ratio to suppress.
Step 21, needs are carried out the transmission signals that peak-to-average ratio suppresses carries out signal modulation style, type of coding detects.
With the modulation of transmission signals input signal, coded system detector, detector detects in real time to transmission signals, obtains real-time modulation, the coded message of each data symbol in each signal segment.
Step 22, the real-time modulation type of transmission signals that obtains according to detection, the tabulation of coding type information inquiry two-stage slicing thresholding, separate configurations is separately supported in this two-stage slicing thresholding tabulation, also supports to unify configuration.Can obtain two groups of slicing thresholding configuration parameters by the tabulation of inquiry slicing thresholding, these two groups of parameters are sent to peak value offset pulse generator 1 and peak value offset pulse generator 2 respectively, so that carry out the processing that two-stage reduces peak-to-average ratio according to two groups of slicing thresholding configuration parameters.
Step 23, according to the real-time modulation type that obtains, coding type information and slicing thresholding configuration parameter by tabling look-up and obtaining, the tabulation of the inquiry power bias factor obtains the power bias value of signal under certain code rate of various modulation types, type of coding.
Step 24, according to the numerical value of tabling look-up of the power bias factor under the different coding modulation signal section, according to the power bias factor amplitude that numerical value determines that power is adjusted of tabling look-up, and then adjust the power of different coding type, modulation type signal, promote less peak-to-average ratio signal power, the power amplifier power output that it is satisfied under the different coding modulation signal waveform quality requirement condition is big as far as possible.
The power adjustment of four pairs of transmission signals of the embodiment of the invention is carried out before transmission signals and peak value offset superimposed pulses, also can be by transmission signals and peak pulse stack back are carried out power adjustment realization to the signal after superposeing to the power adjustment of transmission signals.
First order peak value offset pulse generator during step 25, two-stage peak value offset are handled carries out Filtering Processing according to the slicing thresholding configuration parameter that receives to the peak value that the transmission signals through the overpower adjustment exceeds thresholding, produces the first order simultaneously and offsets peak pulse.
The transmission signals of step 26, process metadata cache and one-level are offset the peak pulse stack, realize the first order of signal peak-to-average ratio is suppressed.Transmission signals with offset the peak pulse stack before, need carry out synchronous detecting to transmission signals and corresponding peaks cancellation pulses, if any asynchrony phenomenon, just can superpose after being adjusted into synchronously.
Second level peak value offset pulse generator during step 27, two-stage peak value offset are handled carries out Filtering Processing according to the slicing thresholding configuration parameter that receives to the peak value that exceeds twice gated service in the transmission signals of handling through a peak-to-average ratio inhibition, produces the second level simultaneously and offsets peak pulse.
Step 28, transmission signals and the secondary counteracting peak pulse handled through the one-level peak value offset superpose, and realize the secondary of signal peak-to-average ratio is suppressed.
Transmission signals with offset the peak pulse stack before, need carry out signal Synchronization equally and detect, if any asynchrony phenomenon, just can superpose after being adjusted into synchronously.
Multistage slicing processing method of the present invention is the expansion to the method for above-mentioned secondary slicing processing, both operation principles are identical, difference is, inquire about multistage slicing thresholding tabulation according to modulation type, the type of coding of transmission signals in the multistage slicing processing method and obtain many group slicing thresholding configuration parameters, the multistage peak value offset pulse of many corresponding generations of group slicing thresholding configuration parameters, with multistage peak value offset pulse successively with transmission signals stack, just obtain supporting the peak-to-average ratio transmission signals through what multistage peak-to-average ratio suppressed.In addition, also need noise extraction in the multistage peak value offset processing procedure, and, identical filter processing method and noise extraction method adopted in the peak value offset processing procedures at different levels.
The method of above-mentioned single-stage, two-stage or multistage inhibition peak-to-average ratio adopts under the situation of system's minimal configuration; Under the situation of system design abundant resource, can also on the basis of this method, expand in conjunction with other methods that do not worsen the reduction peak-to-average ratio of signal modulation quality.
The described method that other do not worsen the reduction peak-to-average ratio of signal modulation quality comprises that selection mapping method, reservation subcarrier TR (Tone Reserve) method, the symbol scrambling handled based on symbol reduce peak-to-average ratio method etc.Use these class methods to reduce peak-to-average ratio and do not influence the signal modulation quality, realize that the position is also very approaching, but difficult stable control peak value, the method that influences signal quality with the present invention in allowed band has complementarity, therefore can use when of the present invention, so that better must reduce peak-to-average ratio in conjunction with these class methods.This method that is used in combination has positive effect for the demanding high order modulation of waveform quality.
Figure 5 shows that the embodiment of the invention five suppresses the schematic diagram of peak-to-average ratio jointly in conjunction with other methods that do not worsen the reduction peak-to-average ratio of signal modulation quality.
As shown in Figure 5, the method that this embodiment of the invention is at first used the reduction peak-to-average ratio that does not worsen the signal modulation quality suppresses the processing of peak-to-average ratio to transmission signals, and the method for the reduction peak-to-average ratio that does not worsen the signal modulation quality that uses in the embodiment of the invention five is that the symbol scrambling reduces the peak-to-average ratio method.
After handling through the reduction peak-to-average ratio method that does not worsen the signal modulation quality, again transmission signals is carried out the processing that produces peak value offset pulse inhibition signal peak-to-average ratio by the identification signal type of the present invention, the inhibition to peak-to-average ratio can obtain better effect like this.
Transmission signals after five pairs of reduction peak-to-average ratio methods through not worsening the signal modulation quality of the embodiment of the invention are handled carries out the single-stage peak-to-average ratio to be suppressed, and can carry out two-stage or multistage peak-to-average ratio here equally and suppress, and the progression that carries out the peak-to-average ratio inhibition is unrestricted.
In addition, for multistage peak value offset method, when the reduction peak-to-average ratio method that does not worsen the signal modulation quality in conjunction with other suppresses peak-to-average ratio jointly, other processing procedures that do not worsen the reduction peak-to-average ratio of signal modulation quality can be in before the first order peak value offset in or multistage peak value offset process between the two-stage peak value offset is handled arbitrarily, and can use the method for the reduction peak-to-average ratio that does not worsen signal quality realize the peak-to-average ratio inhibition jointly by one or many before the pulse of first order peak value offset produces or between the additive process of peak value offset pulse at different levels and transmission signals.
Figure 6 shows that the device schematic diagram of the embodiment of the invention six.
A kind of peak-to-average power ratio optimizing device comprises:
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter;
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
Also comprise:
The peak-to-average ratio that does not worsen quality suppresses module, is connected with described signal type detection module, is used for before producing the peak value offset pulse according to signal type peak-to-average ratio being suppressed.
Described peak-to-average ratio suppresses module and comprises:
The peak value offset pulse produces submodule, according to the pulse of the corresponding generation of slicing thresholding configuration parameter peak value offset, when tabulation obtained multistage slicing threshold parameter according to multistage slicing thresholding, peak value offset pulse of every grade of corresponding input of parameter produced submodule, produces multistage peak value offset pulse;
The stack submodule carries out synchronous regime to transmission signals and peak value offset pulse and detects and adjust, when transmission signals and peak value offset impulsive synchronization with transmission signals and peak value offset superimposed pulses.
Described peak-to-average ratio suppresses module and also comprises:
Cache sub-module is carried out buffer memory to transmission signals before peak value offset pulse and transmission signals superpose;
Power adjustment submodule is inquired about the tabulation of the power bias factor according to modulation type, the type of coding of transmission signals and is obtained the power bias factor, the power of adjustment transmission signals before transmission signals and peak value offset superimposed pulses or after the stack.
All method for inhibiting peak-to-average ratio of the present invention all can be before the variable Rate filter bank in system, afterwards, or between the dual stage filter of cascade mutually, carry out.The embodiment of the invention comprises a kind of OFDM transmitter, this transmitter comprises base band Fourier transform module, D/A converter module, the frequency conversion filter bank and the digital frequency conversion module that comprise a plurality of filters, it is characterized in that, between base band Fourier transform module and D/A converter module, also comprise the peak-to-average power ratio optimizing module
Described peak-to-average power ratio optimizing module is used to discern different transmission signals classifications, and carries out peak-to-average ratio respectively according to different transmission signals classifications and suppress.
Described peak-to-average power ratio optimizing module further comprises;
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter;
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
Described peak-to-average power ratio optimizing module is connected between each filter of variable Rate filter bank; Or be connected between variable Rate filter bank and the digital frequency conversion module; Or be connected between digital frequency conversion module and the D/A converter module.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (21)
1, a kind of peak-to-average power ratio optimizing method is characterized in that, comprising:
The type of A, identification transmission signals produces the corresponding peaks cancellation pulses respectively according to dissimilar transmission signals;
B, with described peak value offset pulse and transmission signals stack output.
2, a kind of peak-to-average power ratio optimizing method according to claim 1 is characterized in that, also comprises before described steps A:
P1, be that transmission signals adds synchronous signal type identification mark;
The type of the transmission signals of identification described in the steps A is finished by detected transmission signal classification logotype.
3, a kind of peak-to-average power ratio optimizing method according to claim 1 is characterized in that, also comprises before described steps A:
P2, dissimilar transmission signals is carried out the transmitted power adjustment;
The type of the transmission signals of identification described in the steps A is by the transmitted power identification transmission of signal-type to transmission signals.
4, a kind of peak-to-average power ratio optimizing method according to claim 2, it is characterized in that, described type detection to transmission signals comprises that the live signal modulation type detects, the live signal type of coding detects, and described detection is that least unit is carried out with the data symbol in the signal segment.
5, a kind of peak-to-average power ratio optimizing method according to claim 1 is characterized in that, before or after described peak value offset pulse and transmission signals overlap-add procedure, transmission signals is carried out the power adjustment; Or after base band is earlier adjusted the power of transmission signals again with its transmission.
6, a kind of peak-to-average power ratio optimizing method according to claim 5, it is characterized in that, transmission signals before the described overlap-add procedure or after the overlap-add procedure is carried out the amplitude of power adjustment and determine by the bigoted factor list query of the power that carries out according to transmission of signal-type.
7, a kind of peak-to-average power ratio optimizing method according to claim 1 is characterized in that, before described peak value offset pulse and the superimposed processing of transmission signals, need carry out the synchronous detecting and the adjustment of peak value offset pulse and transmission signals.
8, a kind of peak-to-average power ratio optimizing method according to claim 1 is characterized in that, the processing that described generation peak value offset pulse reduces the signal peak-to-average ratio needs to carry out in conjunction with the variable Rate Filtering Processing to transmission signals.
9, a kind of peak-to-average power ratio optimizing method according to claim 8, it is characterized in that, described variable Rate Filtering Processing to transmission signals is realized jointly that by variable Rate filter bank and upconverter the peak value offset pulse produces and carries out before or after signal enters filter bank or in the process with the process of transmission signals stack.
10, according to the described a kind of peak-to-average power ratio optimizing method of claim 1 to 9, it is characterized in that described peak value offset pulse comprises:
Single-stage peak-to-average ratio cancellation pulses or multistage peak-to-average ratio cancellation pulses;
It is according to the tabulation of transmission of signal-type single inquiry slicing thresholding that described single-stage peak value offset pulse produces, and obtains single-stage slicing thresholding configuration parameter; According to single-stage slicing thresholding configuration parameter transmission signals is carried out single treatment, the peak value that exceeds thresholding is carried out Filtering Processing, and produce single-stage peak value offset pulse and transmission signals and carry out single-stage and superpose and obtain;
The generation of multistage peak value offset pulse is to inquire about multistage slicing thresholding tabulation according to the transmission of signal-type testing result, obtains multistage slicing thresholding configuration parameter; According to multistage slicing thresholding configuration parameter transmission signals is carried out multistage peak value offset and handle, the transmission signals peak value that exceeds thresholdings at different levels is carried out Filtering Processing, produce multistage peak value offset pulse and transmission signals and carry out multi-stage superimposed and obtain; Separate configurations is supported in multistage slicing thresholding tabulation, or supports unified configuration.
11, a kind of peak-to-average power ratio optimizing method according to claim 10, it is characterized in that, also comprise in described single-stage stack: use the method for the reduction peak-to-average ratio that does not worsen signal quality to realize that jointly peak-to-average ratio suppresses before the pulse of generation peak value offset, the described method that does not worsen the reduction peak-to-average ratio of signal quality comprises based on the selection mapping method of symbol processing, keeps subcarrier method, symbol scrambling reduction peak-to-average ratio method.
12, a kind of peak-to-average power ratio optimizing method according to claim 10, it is characterized in that, also need noise extraction in the described multistage peak value offset processing procedure, and, identical filter processing method and noise extraction method adopted in the peak value offset processing procedures at different levels.
13, a kind of peak-to-average power ratio optimizing method according to claim 10, it is characterized in that, in described multi-stage superimposed processing procedure, one or many uses the method for the reduction peak-to-average ratio that does not worsen signal quality to realize that jointly peak-to-average ratio suppresses before the pulse of first order peak value offset produces or between the additive process of peak value offset pulse at different levels and transmission signals.
14, a kind of peak-to-average power ratio optimizing method according to claim 10, it is characterized in that the described method that other do not worsen the reduction peak-to-average ratio of signal modulation quality comprises that selection mapping method, reservation subcarrier TR method, the symbol scrambling handled based on symbol reduce peak-to-average ratio method etc.
15, a kind of peak-to-average power ratio optimizing device is characterized in that, comprising:
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter;
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
16, a kind of peak-to-average power ratio optimizing device according to claim 14 is characterized in that, also comprises:
The peak-to-average ratio that does not worsen quality suppresses module, is connected with described signal type detection module, is used for before producing the peak value offset pulse according to signal type peak-to-average ratio being suppressed.
17, a kind of peak-to-average power ratio optimizing device according to claim 14 is characterized in that, described peak-to-average ratio suppresses module and comprises:
The peak value offset pulse produces submodule, according to the pulse of the corresponding generation of slicing thresholding configuration parameter peak value offset, when tabulation obtained multistage slicing threshold parameter according to multistage slicing thresholding, peak value offset pulse of every grade of corresponding input of parameter produced submodule, produces multistage peak value offset pulse;
The stack submodule carries out synchronous regime to transmission signals and peak value offset pulse and detects and adjust, when transmission signals and peak value offset impulsive synchronization with transmission signals and peak value offset superimposed pulses.
According to the described a kind of peak-to-average power ratio optimizing device of claim 15 to 17, it is characterized in that 18, described peak-to-average ratio suppresses module and also comprises:
Cache sub-module is carried out buffer memory to transmission signals before peak value offset pulse and transmission signals superpose;
Power adjustment submodule is inquired about the tabulation of the power bias factor according to modulation type, the type of coding of transmission signals and is obtained the power bias factor, the power of adjustment transmission signals before transmission signals and peak value offset superimposed pulses or after the stack.
19, a kind of OFDM transmitter, comprise base band Fourier transform module, D/A converter module, comprise the frequency conversion filter bank and the digital frequency conversion module of a plurality of filters, it is characterized in that, between base band Fourier transform module and D/A converter module, also comprise the peak-to-average power ratio optimizing module
Described peak-to-average power ratio optimizing module is used to discern different transmission signals classifications, and carries out peak-to-average ratio respectively according to different transmission signals classifications and suppress.
20, a kind of OFDM transmitter according to claim 19 is characterized in that, described peak-to-average power ratio optimizing module further comprises;
The signal type detection module is used for the type of detected transmission signal;
Slicing thresholding configuration module, be used for type inquiry slicing thresholding tabulation, obtain slicing thresholding configuration parameter, in slicing thresholding configuration module configuration one-level or the tabulation of above slicing thresholding according to transmission signals, inquire about slicing thresholding tabulations at different levels, obtain multistage slicing thresholding configuration parameter;
Peak-to-average ratio suppresses module, is used for producing peak value offset pulse and transmission signals stack according to slicing thresholding configuration parameter, reduces the transmission signals peak-to-average ratio.
21, according to claim 19 or 20 described a kind of OFDM transmitters, it is characterized in that described peak-to-average power ratio optimizing module is connected between each filter of variable Rate filter bank; Or be connected between variable Rate filter bank and the digital frequency conversion module; Or be connected between digital frequency conversion module and the D/A converter module.
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WO2010149012A1 (en) * | 2009-06-22 | 2010-12-29 | 华为技术有限公司 | Method and device for transmitting signal |
CN101562478B (en) * | 2009-05-25 | 2012-08-29 | 成都芯通科技股份有限公司 | Method for adaptively adjusting CFR threshold and radio frequency zooming system |
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