CN1129289C - Join compensation method and device for decreasing ratio of peak power to average power for multi-carrier signals - Google Patents
Join compensation method and device for decreasing ratio of peak power to average power for multi-carrier signals Download PDFInfo
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Abstract
一种降低多载波信号峰值功率对平均功率之比的联合补偿方法，其特点是：多载波信号分别经过调制后，进行相加形成一和路信号，并根据该和路信号，由至少一路以上的计算和搜索进行单路补偿或联合补偿，获取相应的补偿信号，将该补偿信号和一和路信号相加产生一补偿后的标准信号。本发明有效地降低了多载波信号峰值功率对平均功率之比。
A joint compensation method for reducing the ratio of peak power to average power of multi-carrier signals, which is characterized in that multi-carrier signals are respectively modulated and added to form a sum signal, and according to the sum signal, at least one or more Computing and searching for single-channel compensation or combined compensation to obtain a corresponding compensation signal, and adding the compensation signal to the first-channel signal to generate a compensated standard signal. The invention effectively reduces the ratio of the peak power to the average power of multi-carrier signals.
Description
The present invention relates to a kind of associating compensation method that reduces multi-carrier signal peak value power to the ratio of average power in the digital communication system.
In digital communication system, especially in the mobile communication system, the high modulation mode of seeking superior performance under given channel condition is important research project always.For the radio frequency unit of digital intermediate frequency transmitter, when modulation signal remains on a quite constant level, radio frequency amplifier work in the radio frequency unit gets best, and big peak value or can cause the poor efficiency of amplifier to be used, or can cause the situation of linearity variation.Therefore the radio frequency amplifier peak power of wishing modulation signal to the ratio of average power as much as possible near 0db.As Fig. 1 is a kind of digital intermediate frequency transmitter of multicarrier system, and multi-carrier signal passes through DAC (digital to analog converter) after by Base Band Unit modulation and upconverter again, just enters into radio frequency unit.If system does not carry out the restriction of necessity to the peak power of multi-carrier signal with the ratio of average power.Then in order to guarantee that signal is undistorted and avoid frequency spectrum diffusion, the maximum power of the radio frequency amplifier in the radio frequency unit can be far longer than average power.This had both caused the waste of radio frequency unit, had caused suitable trouble also for simultaneously the design of radio frequency unit.
And at present, the method for multi-carrier modulation is to walk abreast with several data flow to modulate several carrier waves.Form the composite signal of multi-user's multi-carrier modulation in the base station, make base station common numbers MF transmitter, rather than transmitter of a carrier wave employing, so just can reduce production costs, thereby obtain good economic benefit.And the ratio of the shortcoming of the method maximum of this multi-carrier modulation to be signal after synthetic present very high peak power and average power, just maximum power is much larger than average power.For fear of distortion with reduce spectrum diffusion, the signal after synthetic is amplified need very big linear dynamic range.This means that also the designer is forced to use an amplifier that the range of linearity is very big simultaneously, and its peak power is far longer than the average power of signal, and this can improve the cost of system undoubtedly greatly.Therefore under the prerequisite that does not reduce other performance index, reduce the ratio of peak power with the average power of composite signal as much as possible, make the permanent as far as possible envelope of signal or, just become designer's target near permanent envelope.
Band external compensation method is a kind of novel method.Its basic principle is according to input signal, generate certain band external compensation signal, the envelope approximately constant of gained composite signal after original signal and the compensating signal addition or signal peak power and the ratio of average power are reduced, and requiring to make the power of compensating signal and error rate of system as far as possible little, composite signal also can satisfy the requirement of agreement.Because compensating signal is added in outside the band, so less to the original signal influence.The major defect of this method is: when requiring compensate for slower for a long time, calculation of complex is loaded down with trivial details, often not necessarily can realize real-time operation.Can't find the solution on a lot of points of signal simultaneously, compensation method this moment not necessarily can improve the ratio of peak power with the average power of signal.Less then limited with the improvement of the ratio of average power when compensating to peak power.This makes this method be difficult to reach practical level.
The object of the present invention is to provide of the associating compensation method of a kind of reduction multi-carrier signal peak value power that can ensure signal quality to the ratio of average power.
To achieve these goals, the present invention, it is a kind of associating compensation method that reduces multi-carrier signal peak value power to the ratio of average power, its characteristics are: multi-carrier signal is respectively after ovennodulation, carry out addition formation one and road signal, and, carry out the single channel compensation or unite compensation by calculating more than at least one road and search according to this and road signal, obtain the corresponding compensation signal, with the standard signal after this compensating signal and described and road signal plus generation one compensation.Wherein, calculate and the step of the compensating signal that search is obtained is: 1) for all carrying out the whether judgement in allowed band earlier with each sample value of road signal: for permanent envelope cancellation, then allowed band is in permanent envelope value ± 5% scope; For other compensation, then if the absolute value of sample value less than maximum, for being in the allowed band and the sampling point road signal, the sample value tax of corresponding compensation signal is 0, otherwise, carry out the following steps computing; 2) calculate first compensating signal and whether separate,, then compensate with this signal if separate; 3) if first compensating signal does not have to be separated, calculate second compensating signal and whether separate, if separate, then compensate with this signal; 4) if second compensating signal still do not have to be separated, then unite compensation, utilize searching algorithm to find the solution.
Above-mentioned reduction multi-carrier signal peak value power is to the associating compensation method of the ratio of average power, wherein, the search step of associating compensation is: make the amplitude of one road compensating signal change by a fixed step size in a certain specified scope, whether another compensating signal this moment of calculating is simultaneously separated, if separating arranged and meet the requirement of appointment, then get the numerical value of this moment and jump out search loop; Otherwise, then continue search until going beyond the scope.
Above-mentioned reduction multi-carrier signal peak value power is to the associating compensation method of the ratio of average power, and wherein, the calculation procedure of uniting compensation is: calculate certain sampling time and phase place road signal phasor and first via compensating signal vector; Calculate the phase place of two anti-vectors; If the phase place of the second road compensating signal vector between two anti-vector phases, then directly compensates with the second road compensating signal; Otherwise, then unite compensation with the inverted signal of the second road compensating signal.
Above-mentioned a kind of associating compensation method is used for reducing the ratio of signal peak power and average power, all signaling points all had compensation effect, can solve existing compensating signal and not have the ratio problem that can't improve signal peak power and average power that causes of separating, improve the service efficiency of radio frequency amplifier simultaneously, and reduced the cost of system.
The present invention is further illustrated below in conjunction with embodiment and accompanying drawing.
Fig. 1 is the structure function block diagram of existing digital intermediate frequency transmitter;
Fig. 2 is that the present invention reduces the structure function block diagram of multi-carrier signal peak value power to the embodiment of the device of the ratio of average power;
Fig. 3 is the calculating in the inventive method and searches for the flow chart of compensation;
Fig. 4 is the compensation schematic diagram of vector representation.
As shown in Figure 2, the present invention reduces the associating compensation arrangement of multi-carrier signal peak value power to the ratio of average power, and it comprises: modulator 22, the multi-carrier signal 21 of input is modulated respectively, and each signal after the output modulation; With road device 23, receive each signal of modulator 22 outputs, carry out addition, formation one and road signal and output; Compensation maker 25, from road device 23 receive and the road signal carries out calculating and search more than at least one road formation compensating signal, and export this compensating signal; Adder 24 from receiving respectively and road signal and compensating signal with compensating the maker 25 with road device 23, is carried out addition, the standard signal after the output compensation.
Multi-carrier signal 21 is through behind the modulators 22, is being summed into one and the road signal with road device 23.This and road signal be input in the compensation maker 25 calculate and search for, can calculate the corresponding compensation signal.Use compensating signal and former and road signal addition in adder 24 then.
If requiring the signal of output is the signal of permanent envelope, then amount of calculation is very big, probably can appear at the situation that some point can't compensate simultaneously.So can be suitable soften terms, and do not require that the signal of output is the signal of a permanent envelope, can reduce the number of amount of calculation and no solution point so greatly.
When having only one road compensating signal, can occur not having the situation of separating at some point certainly.And in the two-way compensating signal, under certain conditions, all points are all had compensation effect.
Compensating signal adopts a kind of amplitude-modulated signal, and it is asked for is that mode by solving an equation is carried out.When negative separating appears in compensating signal, mean that signal has one 180 phase transformation of spending at this point, signal no longer is a simple amplitude-modulated signal, but the signal of an amplitude modulation phase modulation.In this algorithm compensating signal only found the solution and uniting desirable negative value under the situation of compensation.Other situation only allow get on the occasion of.
The present invention can also realize by following method, it is a kind of associating compensation method that reduces multi-carrier signal peak value power to the ratio of average power, its process is: multi-carrier signal is respectively after ovennodulation, carry out addition formation one and road signal, and according to this and road signal, carry out single channel compensation or unite compensation by calculating more than at least one road and search, obtain the corresponding compensation signal, with each compensating signal and one and the road signal plus produce standard signal after the compensation.
What compensating signal can adopt is a kind of amplitude-modulated signal, and asking for of compensating signal is that method by solving an equation is asked for.When negative separating appears in compensating signal, mean that signal is not a simple amplitude-modulated signal, but an amplitude modulation phase-modulated signal.In this algorithm, compensating signal only found the solution uniting and just gets negative value under the situation of compensation, only allow under other situation get on the occasion of.
As shown in Figure 3, in the said process, the step of calculating and searching for compensation is:
1) for all carrying out the whether judgement in allowed band earlier with each sample value of road signal: for permanent envelope cancellation, then allowed band is in permanent envelope value ± 5% scope; For other compensation, then if the absolute value of sample value less than maximum, for being in the allowed band and the sampling point road signal, the sample value tax of corresponding compensation signal is 0, otherwise, carry out the following steps computing;
2) calculate first compensating signal and whether separate,, then compensate with this signal if separate;
3) if first compensating signal does not have to be separated, calculate second compensating signal and whether separate, if separate, then compensate with this signal;
4) if second compensating signal still do not have to be separated, unite compensation, utilize searching algorithm to find the solution.
In the above-mentioned process, the search step of associating compensation is: make the amplitude of one road compensating signal change by a fixed step size in a certain specified scope, calculate this moment another compensating signal simultaneously and whether separate,, then get the numerical value of this moment and jump out search loop if separating arranged and meet the requirement of appointment; Otherwise, then continue search until going beyond the scope.
Judge that uniting the algorithm that compensates validity mainly realizes by method for vector analysis.Basic ideas are as follows:
Can be the signal phasor on an I-Q plane with the multi-carrier signal equivalence, the mould of vector be
Phase place also can be by Q (t), and I (t) determines; The then available vector representation of rotation in the counterclockwise direction of compensating signal y (t), its angular velocity of rotation is Δ f, mould is a (t).
Radius of a circle is represented the size of desired permanent envelope among Fig. 4 under permanent envelope cancellation situation, represents the maximum of the composite signal envelope that is allowed under non-permanent envelope cancellation situation.
When adopting two combined signal compensation, the situation of this moment is comparatively complicated, is difficult to reach a conclusion with the method for mathematical derivation, method with signal phasor is analyzed, through research and test, to conclude and summed up the situation of not having normal solution when uniting compensation, this conclusion can reduce:
When the second road compensating signal vector drops in the folded zone of the anti-vector of the anti-vector of first via compensating signal vector and original signal vector, can unite compensation; Otherwise, then can't unite compensation.But because we can compensate with the anti-vector of compensating signal.For this situation, we can think phase hit 180 degree that is equivalent to compensating signal, and this moment, in fact compensating signal contained the composition of phase modulation.Considering under the situation of anti-vector that adopt the two-way compensating signal just can accomplish all can compensate in all cases, Fig. 4 is seen in concrete analysis.
Among Fig. 4, first via compensating signal vector
And anti-vector, the multi-carrier signal vector
And two tangent lines of end points are divided into 6 zones with the plane.Can finish compensation (if in zone 4, then compensating) in 1,4 in the zone if a compensating signal is arranged with its anti-vector: if the vector of second compensating signal in regional 2,5, then with
Finish the associating compensation; If second vector in 3,6 zones, then with
Anti-vector finish the associating compensation, this shows, adopt the two-way compensating signal just can accomplish all can compensate in all cases.
In sum, the present invention proposes the method that a kind of associating compensation method reduces signal peak power and the ratio of average power, at first signal is compensated, obtain compensating signal by certain calculating and search earlier.Add compensating signal, produce the standard signal after compensating.The present invention can solve compensating signal does not have the ratio problem that can't improve signal peak power and average power that causes of separating.And in backoff algorithm and design, certain improvement is arranged also.
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Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119623 CN1129289C (en) | 2000-08-17 | 2000-08-17 | Join compensation method and device for decreasing ratio of peak power to average power for multi-carrier signals |
| EP01983405A EP1324556A4 (en) | 2000-08-17 | 2001-07-09 | Method and apparatus for reducing multi-carrier signals ratio of peak power to average power |
| AU2002214917A AU2002214917A1 (en) | 2000-08-17 | 2001-07-09 | Method and apparatus for reducing multi-carrier signals ratio of peak power to average power |
| PCT/CN2001/001164 WO2002015507A1 (en) | 2000-08-17 | 2001-07-09 | Method and apparatus for reducing multi-carrier signals ratio of peak power to average power |
| US10/367,419 US7236533B2 (en) | 2000-08-17 | 2003-02-14 | Method and apparatus for reducing ratio of peak power to average power of multi-carrier signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 00119623 CN1129289C (en) | 2000-08-17 | 2000-08-17 | Join compensation method and device for decreasing ratio of peak power to average power for multi-carrier signals |
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| CN1338851A CN1338851A (en) | 2002-03-06 |
| CN1129289C true CN1129289C (en) | 2003-11-26 |
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