CN109218245A - A kind of PAPR suppressing method based on cascade optimum angle - Google Patents
A kind of PAPR suppressing method based on cascade optimum angle Download PDFInfo
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- CN109218245A CN109218245A CN201811120166.1A CN201811120166A CN109218245A CN 109218245 A CN109218245 A CN 109218245A CN 201811120166 A CN201811120166 A CN 201811120166A CN 109218245 A CN109218245 A CN 109218245A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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Abstract
The invention discloses a kind of PAPR suppressing method based on cascade optimum angle, step 1: the order of initialization SLM algorithm, the phase sequence number of each order algorithm；Step 2: judging whether to be greater than the phase sequence number given under current SLM order, if so, EP (end of program), if it is not, then carrying out step 3；Step 3: judging whether to calculate optimum angle, if then carrying out step 5, if otherwise carrying out step 4；Step 4: optimum angle is calculated；Step 5: SLM algoritic module is calculated, and return step two recycles.The present invention effectively improves the probability that low PAPR occurs.
Description
Technical field
The present invention relates to a kind of PAPR suppressing method, especially a kind of PAPR suppressing method based on cascade optimum angle.
Background technique
OFDM is a kind of Highspeed Data Transmission Technology, and high-speed serial data is transformed into the parallel data of multichannel relative low speeds
And different carrier waves is modulated.This parallel transmission system greatly expands the pulse width of symbol, improves anti-multipath
The performance of the bad transmissions conditions such as decline.
However, the output of ofdm system, which is easy to cause, there is biggish papr compared with single-carrier system
(Peak to Average Power Ratio, PAPR).High PAPR proposes the linearity of transmitter power amplifier very high
Requirement.If it is impossible to meet the variation of signal, signals to pass through waveform meeting after amplifier for the dynamic range of power amplifier
It is distorted, so that the signal spectrum of superposition is changed, destroyed so as to cause the orthogonality between each subcarrier.
Therefore, many people study the suppressing method of PAPR in recent years.
Pre-distortion signal technology is that the direct method for reducing peak-to-average force ratio limits it substantially by Nonlinear Processing predistortion
System is within the dynamic range of amplifier.Signal carries out clipping before by nonlinear device, and peak signal can be made low
In desired maximum level value.But clipping causes the distortion of signal, so that error code (BER) performance of whole system is
Decline, the thresholding of clipping is lower, and distorted signals is more obvious, and the BER performance of system is poorer.
Second class is coding class technology, and the basic principle of this method is to generate the lesser OFDM of PAPR using different coding
Symbol, that is, avoid the coding pattern that big peak power signal can be generated using those.But the shortcomings that this method, is
Available coding pattern is fewer, and code efficiency is reduced as sub-carrier number increases.
Third class is probability class technology, selects have minimum PAPR by the way that different scramble sequences is added to OFDM symbol
Ofdm signal transmitted.Probability class method usually has SLM and PTS.SLM method is first generated comprising identical information and independent
Multiple ofdm signals, wherein the small signal of PAPR is sent for selection, if the biography generated after inverse Fourier (IFFT) transformation
The more more then performances of defeated sequence are better.Partial transmission sequence technology (PTS) method is that the data vector of input is divided into multiple phases
The subvector not overlapped, to the subcarrier in subvector multiplied by an identical twiddle factor, by selection twiddle factor come
Reduce PAPR.
For margining amplitude technique, the excessively high part of signal is limited, so that distorted signals.Coding mode is many in carrier number
When, complexity is very high and has very high redundancy.Probability class method will not influence the bit error rate of signal, and complexity is connecing
By in range, and without very high redundancy, wherein including two ways SLM and PTS.In addition, the computation complexity of SLM wants small
In the complexity of PTS.Therefore SLM is widely used in the inhibition of ofdm signal PAPR.
In an ofdm system, ofdm signal is formed by stacking by multiple independent, through ovennodulation sub-carrier signals, in this way
Synthesized superposed signal, which has, can produce very big peak power, thus can bring biggish peak-to-average power ratio (PAPR).
The peak-to-average power ratio of ofdm signal is defined as
Traditional SLM method, multiplied by out of phase sequence, is generated new by generating the signal of multiple groups identical data information
Signal, select to be transmitted with the signal of minimum PAPR.Traditional SLM configuration block diagram is as shown in Figure 1.In the left side side Fig. 3
In frame, box upper part is OFDM spectrogram, is below time domain waveform.Different boxes represent the letter of identical data information
Number.These signals are multiplied with one group of different random phasic serial signal P (i) respectively, wherein i=1,2 ..., U.U is random phase
Bit sequence number.P (i) is represented by [pi/2 ,-pi/2 ,-pi/2 ... pi/2], and [- pi/2, pi/2 ..., pi/2], [π, π ... ,-π] etc. has
U kind random phasic serial signal has phase element identical with carrier number in each sequence, these phase elements are mainly by ± pi/2
Or ± π composition.The signal of identical data information original in this way becomes new mutual after the multiplication of different random phase sequence
Different signal, after then converting using IFFT, blue and red curve indicate time domain waveform as shown in figure 1.Finally count
Each new PAPR value for generating signal is calculated, selects one group of signal with minimum PAPR to be sent, time domain waveform such as Fig. 3
Middle red curve indicates.
However, if it is desired to want PAPR lower, the number of increase phase sequence, ability can only be passed through for SLM algorithm
There is higher probability to obtain the phase of lower PAPR, however the reduction of PAPR be not as the growth of phase is linear,
Therefore for SLM, a large amount of phase sequence may be unsatisfactory to the inhibitory effect of PAPR.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of PAPR suppressing methods based on cascade optimum angle, effectively
Improve the probability that low PAPR occurs in ground.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of PAPR suppressing method based on cascade optimum angle, it is characterised in that comprise the steps of:
Step 1: the order of initialization SLM algorithm, the phase sequence number of each order algorithm；
Step 2: judging whether to be greater than the phase sequence number given under current SLM order, if so, EP (end of program), if
It is no, then carry out step 3；
Step 3: judging whether to calculate optimum angle, if then carrying out step 5, if otherwise carrying out step 4；
Step 4: optimum angle is calculated；
Step 5: SLM algoritic module is calculated, and return step two recycles.
Further, the step 4 is specially and the phase between [0, π] is equally divided into several pieces, calculates separately this
Under a little phase conditions, the corresponding PAPR value of out of phase, selecting the corresponding phase of minimum PAPR value is optimum angle.
Further, in the step 5, under identical carrier number and identical phase sequence, it is only necessary to be calculated
The optimum angle calculating of optimum angle, second-order SLM algorithm is on the basis of first time, and n-th is then at (n-1)th time
On the basis of, until the SLM algorithm of all orders all obtains optimal phase.
Further, the phase sequence number and corresponding carrier number will be saved in multistage SLM algorithm, be calculated
After primary, as long as giving identical phase sequence number and carrier number later, all do not need to recalculate optimum angle.
Further, the PAPR value is the peak-to-average power ratio of ofdm signal,
Further, it in the step 1, receives and comes from modulated signal, and carry out serioparallel exchange.
Further, the phase average between [0, π] is divided into 100 parts by the step 4, and detailed process is as follows
For phase=[π/100: π/100: π]
Initialization: phase sequence number L, carrier number；
Optimal PAPR value indicates that optimal solution subscript is indicated with i with P0；
At given phase, PAPR is calculated；
It is executed before every rank SLM algorithm once, wherein i is the subscript of optimum angle, and corresponding phase is optimal phase
Position.
Compared with prior art, the present invention having the following advantages that and effect: the present invention passes through MSOP-SLM algorithm, Ke Yiyou
It imitates ground and improves the probability that low PAPR occurs, when 3 ranks optimize SLM algorithm, the probability of 10dB phase sequence appearance below
Have relative to traditional SLM algorithm close to 47% increase rate.In addition, we simulate SLM by 10000 OFDM symbols
Algorithm and MSOP-SLM algorithm proposed by the present invention, in the case where order is 3 and phase sequence number is 360, MSOP-SLM is calculated
Method has the gain of 0.5dB relative to SLM algorithm.
Detailed description of the invention
Fig. 1 is a kind of flow chart of PAPR suppressing method based on cascade optimum angle of the invention.
Fig. 2 is the flow chart of calculating optimum angle of the invention.
Fig. 3 is the schematic diagram of the prior art.
Fig. 4 is the Inhibitory Effects figure of the different phase to PAPR of the embodiment of the present invention.
Fig. 5 be the embodiment of the present invention PAPR in 120 phase sequences inhibit system MSOPS-SLM not
Raw probability is issued with series.
Fig. 6 be the embodiment of the present invention in CCDF in 10-3, C-OFDM (warning triangle), C-SLM (circle mark
Note) and MSOP-SLM (square marks) CCDF performance.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
As illustrated in fig. 1 and 2, a kind of PAPR suppressing method based on cascade optimum angle comprising the steps of:
Step 1: the order of initialization SLM algorithm, the phase sequence number of each order algorithm；It receives from modulated
Signal, and carry out serioparallel exchange.
Step 2: judging whether to be greater than the phase sequence number given under current SLM order, if so, EP (end of program), if
It is no, then carry out step 3；
Step 3: judging whether to calculate optimum angle, if then carrying out step 5, if otherwise carrying out step 4；
Step 4: optimum angle is calculated；
The phase between [0, π], several pieces are equally divided into, are calculated separately under these phase conditions, out of phase is corresponding
PAPR value, selecting the corresponding phase of minimum PAPR value is optimum angle.
PAPR value is the peak-to-average power ratio of ofdm signal,
Step 5: SLM algoritic module is calculated, and return step two recycles.
Under identical carrier number and identical phase sequence, it is only necessary to carry out calculating an optimum angle, second-order SLM
The optimum angle calculating of algorithm is on the basis of first time, and n-th is then on the basis of (n-1)th time, until all orders
SLM algorithm all obtain optimal phase.Phase sequence number and corresponding carrier number will be saved in multistage SLM algorithm,
After calculating once, as long as giving identical phase sequence number and carrier number later, all do not need to recalculate optimum angle.
Signal receives to carry out the model after automodulation first, then exports by serioparallel exchange by multistage SLM.SLM
Order, can according to PAPR inhibit requirement be selected.For example, the cascade for a n rank optimizes SLM algorithm, receiving
Signal after carrying out automodulation and going here and there and fill alternatively.The algorithm is executed if it is first OFDM symbol, we are firstly the need of first counting
Calculate the optimum angle value of SLM algorithm in the case where current order.Then, on the basis of the first rank, the optimal of second-order is calculated
Phase, and so on, until calculating the optimum angle under all orders.When the second OFDM symbol may not necessarily calculate often again
The optimum angle of the SLM of rank, it is only necessary to directly execute the SLM algorithm of corresponding order.
The present invention is further illustrated below by specific emulation embodiment:
The MATLAB that this emulation uses simulates the transmitting terminal of an OFDM.Signal source is using 15 rank pseudorandoms
Code (PRBS15), modulation format using 16 ranks quadrature amplitude modulation (16QAM).The carrier number used is 1024, is adopted
With the SLM optimization algorithm of 3 ranks, 120 different phase sequences are provided with for every rank SLM.
In order to more accurately find optimum angle, direct for 0 to π we are equally divided into 100 parts.Therefore in every level-one
Before SLM algorithm, phase [0, π] is divided into 100 equal parts.And this is calculated separately in the case of 100, the value of corresponding PAPR, such as
Shown in Fig. 4 (a), it is corresponding PAPR value under 100 kinds of phases that first order SLM algorithm is tested before, is marked out in red circle
Range where optimum angle.It such as Fig. 4 (b), has simulated before the SLM algorithm of the second level, PAPR is corresponding under 100 kinds of phases
Value, the same range that optimum angle is identified using red circle.Such as Fig. 4 (c), in the case of simulating third level SLM algorithm
The corresponding PAPR of 100 kinds of phases, red circle in be optimum angle range.
In order to observe that the low PAPR phase sequence of the opposite C-SLM of MSOP-SLM algorithm in the case of different rank goes out
Existing probability will be used under test different rank, the probability of occurrence of different PAPR using 10000 different phase sequences.
As shown in Fig. 5 (a), the corresponding probability distribution graph of first order SLM algorithm is illustrated, wherein Selecting phasing and biography
The SLM algorithm of system is identical, so first figure is similarly represented as traditional corresponding probability distribution of SLM algorithm, wherein PAPR is big
Reach 71.67% in the probability of 10dB.As shown in Fig. 5 (b), by level-one SLM algorithm, we have reselected optimal phase
Position, wherein PAPR only has 28.02% greater than 10dB.As shown in Fig. 5 (c), wherein PAPR only has 23.55% greater than 10dB.
With the continuous improvement of order, it can be clearly seen that the probability of the phase sequence of low PAPR is being continuously improved.
Finally, 10000 ofdm signals are used to test in traditional SLM algorithm and multilevel optimization proposed by the present invention
CCDF curve in the case of two kinds of SLM algorithm, in the case of total phase sequence number is 360, algorithm proposed by the present invention
There is the gain of 0.5dB relative to traditional SLM algorithm.
The present invention can effectively improve the probability that low PAPR occurs by MSOP-SLM algorithm, calculate in 3 ranks optimization SLM
In the case of method, the probability that 10dB phase sequence below occurs has relative to traditional SLM algorithm close to 47% increase rate.
In addition, we simulate SLM algorithm and MSOP-SLM algorithm proposed by the present invention by 10000 OFDM symbols, it is 3 in order
MSOP-SLM algorithm has the gain of 0.5dB relative to SLM algorithm in the case where being 360 with phase sequence number.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only
It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (7)
1. a kind of PAPR suppressing method based on cascade optimum angle, it is characterised in that comprise the steps of:
Step 1: the order of initialization SLM algorithm, the phase sequence number of each order algorithm；
Step 2: judging whether to be greater than the phase sequence number given under current SLM order, if so, EP (end of program), if it is not, then
Carry out step 3；
Step 3: judging whether to calculate optimum angle, if then carrying out step 5, if otherwise carrying out step 4；
Step 4: optimum angle is calculated；
Step 5: SLM algoritic module is calculated, and return step two recycles.
2. a kind of PAPR suppressing method based on cascade optimum angle described in accordance with the claim 1, it is characterised in that: the step
Rapid four be specially that the phase between [0, π] is equally divided into several pieces, calculated separately under these phase conditions, out of phase pair
The PAPR value answered, selecting the corresponding phase of minimum PAPR value is optimum angle.
3. a kind of PAPR suppressing method based on cascade optimum angle described in accordance with the claim 1, it is characterised in that: the step
In rapid five, under identical carrier number and identical phase sequence, it is only necessary to carry out calculating an optimum angle, second-order SLM
The optimum angle calculating of algorithm is on the basis of first time, and n-th is then on the basis of (n-1)th time, until all orders
SLM algorithm all obtain optimal phase.
4. a kind of PAPR suppressing method based on cascade optimum angle described in accordance with the claim 3, it is characterised in that: the phase
Bit sequence number and corresponding carrier number will be saved in multistage SLM algorithm, after calculating once, as long as given phase later
Same phase sequence number and carrier number, does not all need to recalculate optimum angle.
5. a kind of PAPR suppressing method based on cascade optimum angle according to claim 2, it is characterised in that: described
PAPR value is the peak-to-average power ratio of ofdm signal,
6. a kind of PAPR suppressing method based on cascade optimum angle described in accordance with the claim 1, it is characterised in that: the step
In rapid one, receives and come from modulated signal, and carry out serioparallel exchange.
7. a kind of PAPR suppressing method based on cascade optimum angle according to claim 2, it is characterised in that: the step
Phase average between [0, π] is divided into 100 parts by rapid four, and detailed process is as follows
For phase=[π/100: π/100: π]
Initialization: phase sequence number L, carrier number；
Optimal PAPR value indicates that optimal solution subscript is indicated with i with P0；
At given phase, PAPR is calculated；
It is executed before every rank SLM algorithm once, wherein i is the subscript of optimum angle, and corresponding phase is optimum angle.
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