CN101888694A - Method and device for lowering signal peak-to-mean ratio of multi-carrier system - Google Patents

Method and device for lowering signal peak-to-mean ratio of multi-carrier system Download PDF

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CN101888694A
CN101888694A CN2009100840198A CN200910084019A CN101888694A CN 101888694 A CN101888694 A CN 101888694A CN 2009100840198 A CN2009100840198 A CN 2009100840198A CN 200910084019 A CN200910084019 A CN 200910084019A CN 101888694 A CN101888694 A CN 101888694A
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signal
retardation
module
carriers carry
processing module
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徐红艳
熊芳
康绍莉
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China Academy of Telecommunications Technology CATT
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses a method for lowering the signal peak-to-mean ratio of a multi-carrier system. The method comprises the following steps of: inserting a training sequence midamble code into a signal borne by each carrier; introducing different retardation into the signal borne by each carrier; and superposing the signal. A device for lowering the signal peak-to-mean ratio of the multi-carrier system disclosed by the invention comprises a retardation introduction module and a signal superposition module, wherein the retardation introduction module is used for introducing different retardation into the signal which is borne by each carrier and into which the midamble code has been inserted and outputting signals into which the retardation is introduced; and the signal superposition module is used for receiving the signals into which the retardation is introduced and superposing the received signals for outputting. Due to the adoption of the method and the device, the signal peak-to-mean ratio is lowered and an adjacent channel leakage ratio (ACLR) index and error vector magnitude (EVM) index can be prevented from deteriorating. The system is easy to realize.

Description

A kind of method and apparatus that reduces the signal peak-to-average ratio of multicarrier system
Technical field
The present invention relates to the multi-carrier polymerizing communication technical field, relate in particular to a kind of method and apparatus that reduces the signal peak-to-average ratio of multicarrier system.
Background technology
Along with developing rapidly of the communication technology, for communication systems such as WCDMA, CDMA2000 and TD-SCDMA, the demand of power system capacity increases sharply.At present, increasing frequency resource is the important means of expanding system capacity.Under the prerequisite that increases frequency resource, improve the integrated level of communication system, and then reduce cost, then need to adopt multi-transceiver technology.
Be example with the TD-SCDMA multi-carrier communications systems below, the problem that current multi-carrier communications systems transmission signals exists be described in conjunction with Fig. 1.
Fig. 1 is that the multi-carrier signal in the TD-SCDMA multi-carrier communications systems sends the form schematic diagram.
As seen from Figure 1; in the TD-SCDMA multi-carrier communications systems; inserted training sequence (midamble) sign indicating number in the same position of the signal that each carrier wave carried; wherein; DATA1 among Fig. 1 and DATA2 represent the data division of the signal of carrier wave 1～carrier wave K carrying, and GP is a protection time slot data division.
At present, in the TD-SCDMA multi-carrier communications systems, obtain a plurality of midamble sign indicating numbers after identical basic midamble sign indicating number is shifted, be inserted into respectively in the signal of a plurality of carriers carry in the sub-district, a plurality of carrier waves in sub-district adopt a cover transmitter installation to send signal, therefore, the signal demand of each carriers carry superposes in this transmitter and obtains intermediate frequency and close the road signal.Same midamble sign indicating number displacement obtains because the midamble sign indicating number that inserts in the signal of each carriers carry is based on, midamble sign indicating number part correlation in the signal of each carriers carry is higher, the position of inserting the midamble sign indicating number in the data of each carriers carry is identical, and each carrier wave sends the signal that it carries at synchronization, therefore, when the midamble sign indicating number part in the signal of each carriers carry is superimposed, the probability that the peak-to-peak value stack occurs is bigger, cause intermediate frequency to close the road signal and can produce bigger peak value, and, along with the increase of carrier number, the probability that intermediate frequency closes the big peak value of road signal generation also increases.Thereby the peak-to-average force ratio that the intermediate frequency of present multi-carrier communications systems closes the road signal is bigger usually.
The peak-to-average force ratio that intermediate frequency closes the road signal is big more, and this intermediate frequency closes the easy more inelastic region that enters of road signal, and this will reduce intermediate frequency is closed the efficiency power amplifier that the road signal carries out power amplification.In order to improve described efficiency power amplifier, need to reduce the peak-to-average force ratio that intermediate frequency closes the road signal.
At present, in order to reduce the method that peak-to-average force ratio generally adopts baseband coding or peak clipping, more typical despicking method has the method for hard peak clipping filtering, it realizes that principle is simple, the signal that will handle and peak clipping thresholding are relatively, be restricted on the peak clipping thresholding for sampling point greater than the peak clipping thresholding, this method can cause serious frequency spectrum diffusion, the back is suppressed frequency spectrum diffusion with filter bring very big pressure, and after the signal after the peak clipping is by filter, also may cause peak value to regenerate, make that the peak clipping effect is relatively poor, and can bring Error Vector Magnitude (Error Vector Magnitude, EVM) deterioration of index.Other despicking method such as peak value window method, the hard peak clipping pulse that will be higher than thresholding is through filter smoothing, come the expansion of inhibition zone external spectrum, though this method has suppressed out of band spectrum regeneration to a certain extent, but itself diminishes mistake signal, therefore the EVM index is had deterioration, no matter the sort of despicking method all can worsen the EVM index in the improved while of peak-to-average force ratio.All relevant with coded system with the baseband modulation mode for the method for baseband coding, though the EVM index can not worsen, it is too high that algorithm implements complexity, has problems in practical application for multicarrier system.
As seen, reduce the method for signal peak-to-average ratio in the existing multi-carrier communications systems or can cause adjacent-channel power to leak than (Adjacent Channel Leakage power Ratio, ACLR) deterioration of index and EVM index, perhaps algorithm complex is too high, and system realizes that difficulty is bigger.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide a kind of method and apparatus that reduces the signal peak-to-average ratio of multicarrier system, and preventing the deterioration of ACLR index and EVM index, and system realizes simple.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that reduces the signal peak-to-average ratio of multicarrier system, this method comprises:
After in the signal of each carriers carry, inserting training sequence midamble sign indicating number, in the signal of each carriers carry, introduce different retardations, and then the described signal that superposes.
A kind of device that reduces the signal peak-to-average ratio of multicarrier system, this device comprise retardation introducing module and signal laminating module;
Described retardation is introduced module, and the signal that has been used for inserting of each carriers carry the midamble sign indicating number is introduced different retardations, and the signal of retardation has been introduced in output;
Described signal laminating module is used to receive the signal of having introduced retardation, and to the signal that the receives back output that superposes.
As seen from the above technical solution, because the present invention has introduced different retardations in the signal of each carriers carry, therefore, make the higher part of signal MD of former cause different carrier carrying time of can staggering send, in other words, make each carrier wave there are differences each other, thereby avoided the peak-to-peak value of signal of each carriers carry superimposed, reduced the signal peak-to-average ratio of multicarrier system at the signal that synchronization sends.Method and apparatus provided by the present invention only need be introduced retardation in the signal of each carriers carry, the coded system and the modulation system that do not need to adopt according to baseband signal adopt complicated algorithm, ACLR index and EVM index can not worsen, and system realizes simple.
Description of drawings
Fig. 1 is that the multi-carrier signal in the TD-SCDMA multi-carrier communications systems sends the form schematic diagram.
Fig. 2 is a signal processing schematic diagram of introducing retardation in the baseband signal of each carriers carry provided by the invention.
Fig. 3 is a signal processing schematic diagram of introducing retardation in the intermediate-freuqncy signal of each carriers carry provided by the invention.
Fig. 4 is the structure drawing of device of the signal peak-to-average ratio of reduction multicarrier system provided by the invention.
Fig. 5 is the CCDF curve synoptic diagram.
Fig. 6 is the map of magnitudes of the TD-SCDMA system of 12 carrier waves output signal when not adopting carrier wave time-delay scheme.
Fig. 7 is the map of magnitudes that the TD-SCDMA system of 12 carrier waves has adopted output signal after the carrier wave time-delay scheme.
Fig. 8 is the CCDF curve comparison diagram that the TD-SCDMA system of 12 carrier waves adopts carrier wave time-delay scheme front and back.
Fig. 9 is the spectrogram of the TD-SCDMA system of 12 carrier waves output signal when not adopting carrier wave time-delay scheme.
Figure 10 is the spectrogram that the TD-SCDMA system of 12 carrier waves has adopted output signal after the carrier wave time-delay scheme.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Method and apparatus of the present invention is introduced after the different retardations in the signal of each carriers carry, and described signal again superposes.By introducing delay volume, can reduce the correlation of the signal of each carriers carry, thereby reduce the peak-to-average force ratio after each carrier signal stack.
The present invention can introduce described retardation in the baseband signal of each carriers carry, also can introduce described retardation in the intermediate-freuqncy signal of each carriers carry, describes below in conjunction with Fig. 2 and Fig. 3.
Fig. 2 is a signal processing schematic diagram of introducing retardation in the baseband signal of each carriers carry provided by the invention.
As shown in Figure 2, the signal of each carriers carry d 1... d k(k is the carrier wave number) introduces retardation Δ t respectively through ovennodulation, spectrum-spreading and scrambling and after inserting the midamble sign indicating number 1... Δ t k, retardation Δ t wherein 1... Δ t kCan be produced by the retardation generator, also can directly be stored in the retardation generator, the deferred mount retardation of self-dalay amount generator in the future is incorporated in the signal of each carriers carry.The signal of having introduced retardation superposes after interpolation filtering and up-conversion (DUC) processing again, obtains intermediate frequency and closes road signal and output.In Fig. 2, each carrier wave is all corresponding deferred mount, in fact, each deferred mount can be realized by devices such as same signal processing chips.
Fig. 3 is a signal processing schematic diagram of introducing retardation in the intermediate-freuqncy signal of each carriers carry provided by the invention.
The difference of Fig. 3 and Fig. 2 only is, in Fig. 3, earlier to through ovennodulation, spectrum-spreading and scrambling and each signal of inserting the midamble sign indicating number carries out interpolation filtering and DUC handles, and then introduces retardation Δ t 1... Δ t k
For transmitting terminal, in the signal of each carriers carry, introduce after the different retardations, the described signal that superposes again can reduce signal peak-to-average ratio, for receiving terminal, can need not the signal that receives to be carried out the signal that special processing can detect reception with being incorporated into retardation equivalence in the signal of each carriers carry at transmitting terminal in the channel delay characteristic at receiving terminal.
With the TD-SCDMA system is example, in order to estimate the channel delay characteristic, it is long that receiving terminal has set in advance channel estimation window, the condition that the value of the retardation that the present invention introduced need satisfy is: when receiving terminal utilizes the midamble sign indicating number to do the signal estimation, the value of the retardation of introducing is within channel estimation window can estimated ranges, in other words, the actual channel time delay addition of the value of retardation and the pairing channel of carrier wave of introducing this retardation and to be not more than channel estimation window long.For being positioned at indoor multi-carrier communications systems, because it is less to be positioned at the channel delay of indoor environment itself, therefore, the delay volume value of introducing in the signal of each carriers carry is bigger, correspondingly, for being positioned at outdoor multi-carrier communications systems, because it is bigger to be positioned at the channel delay of outdoor environment itself, the delay volume value of introducing in the signal of each carriers carry is less, it is wide more to be positioned at outdoor multi-carrier communications systems coverage, the channel delay of itself is big more, and then corresponding delay volume value should be more little.For each multi-carrier communications systems, can determine the span of delay volume according to the maximum channel time delay that this multi-carrier communications systems allowed, in this span, get the concrete value of arbitrary value as delay volume.
Fig. 4 is the structure drawing of device of the signal peak-to-average ratio of reduction multicarrier system provided by the invention.
As shown in Figure 4, this device comprises retardation introducing module 401 and signal laminating module 402.
Retardation is introduced module 401, and the signal that has been used for inserting of each carriers carry the midamble sign indicating number is introduced different retardations, and the signal of retardation has been introduced in output.
Signal laminating module 402 is used to receive the signal of having introduced retardation, and to the signal that the receives back output that superposes.
Retardation is introduced module 401 can comprise that retardation provides module 4011 and Postponement module 4012.
Retardation provides module 4011, is used to produce or store different retardations.
Postponement module 4012, the signal of midamble sign indicating number that received inserting of each carriers carry provides module to receive or obtain different retardations from retardation, is incorporated in the described signal described retardation and output.
Device shown in Figure 4 also comprises the baseband signal processing module 403 that carries out base band signal process and carries out the intermediate-freuqncy signal processing module 404 that intermediate-freuqncy signal is handled.
Retardation is introduced module 401 and is connected between baseband signal processing module 403 and the intermediate-freuqncy signal processing module 404, and intermediate-freuqncy signal processing module 404 links to each other 402 with the signal laminating module.
Perhaps, baseband signal processing module 403 links to each other 404 with the intermediate-freuqncy signal processing module, and retardation is introduced module 401 and is connected between intermediate-freuqncy signal processing module 404 and the signal laminating module 402.
The base band signal process that baseband signal processing module 403 carries out comprises: the signal to each carriers carry is modulated, spectrum-spreading and scrambling and insertion midamble sign indicating number.
The intermediate-freuqncy signal that intermediate-freuqncy signal processing module 404 is carried out is handled and comprised: the signal to each carriers carry carries out interpolation filtering and Digital Up Convert.
(Peak to Average Power Ratio, effect PAR) describes below in conjunction with accompanying drawing the technical scheme (hereinafter referred carrier wave time-delay scheme) that adopts the present invention to introduce delay volume to be reduced peak-to-average force ratio after each carrier signal stack.
Generally, a signal x (n), n=0 ..., the peak value of ∞ should be its envelope | x (n) |, n=0 ..., the maximum of ∞.Because the probability that the signal amplitude maximum occurs is very little, use
Figure B2009100840198D0000061
Come the definition signal amplitude peak not have too big practical significance.A kind of more efficiently peak value define method is to adopt probability method, and (Complementary Cumulative Distribution Function, CCDF) curve defines PAR to promptly contrary cumulative distribution function.
For signal x (n), n=0 ..., ∞, its relative instantaneous power may be defined as:
P x = | x ( n ) | 2 1 N Σ n = 0 N - 1 | x ( n ) | 2
Wherein, N is for participating in the signal number of samples of statistics.A signal x (n), n=0 ..., the relative instantaneous power of ∞ is at certain 1 P oAccumulated probability density F oBe defined as:
P r[P s＞P o]＝F o
The CCDF curve representation be at certain hour in the cycle, the ratio cumulative distribution from big to small of each time point instantaneous power and average power.
Fig. 5 is the CCDF curve synoptic diagram.Among Fig. 5, the longitudinal axis is represented cumulative distribution density, and unit is %, and transverse axis is represented power ratio, and unit is dB, generally with the signal PAR value of 0.1 ‰ distributed points.When the CCDF curve changes to curve 2 by curve 1, illustrate to have reduced PAR.
TD-SCDMA system with 12 carrier waves is the PAR value of the output signal after example explanation carrier wave time-delay scheme superposes to each carrier wave and faces Power leakage than (Adjacent Channel Leakage power Ratio, influence ACLR) below.Wherein, in the TD-SCDMA of this 12 carrier wave system, every carrier wave 8 users, every CU 2 code channels.
Fig. 6 is the map of magnitudes of the TD-SCDMA system of 12 carrier waves output signal when not adopting carrier wave time-delay scheme.
Fig. 7 is the map of magnitudes that the TD-SCDMA system of 12 carrier waves has adopted output signal after the carrier wave time-delay scheme.
As seen comparison diagram 6 and Fig. 7 adopt carrier wave time-delay scheme can reduce the amplitude of the Midamble part of system.
Fig. 8 is the CCDF curve comparison diagram that the TD-SCDMA system of 12 carrier waves adopts carrier wave time-delay scheme front and back.
Among Fig. 8, curve 1 is to adopt the preceding CCDF curve of carrier wave time-delay scheme, and curve 2 is the CCDF curves after the employing carrier wave time-delay scheme.As seen from Figure 8, at 0.01% place, after the employing carrier wave time-delay scheme, the PAR value is reduced to 9.58 by 14.97, effectively reduces PAR.
Fig. 9 is the spectrogram of the TD-SCDMA system of 12 carrier waves output signal when not adopting carrier wave time-delay scheme.
Figure 10 is the spectrogram that the TD-SCDMA system of 12 carrier waves has adopted output signal after the carrier wave time-delay scheme.
As seen comparison diagram 9 and Figure 10 adopt the spectrogram difference of carrier wave time-delay scheme front and back system less, and therefore, carrier wave time-delay scheme is less to the influence of ACLR.
Because the present invention has introduced different retardations in the signal of each carriers carry, make each carrier wave there are differences each other at the signal that synchronization sends, thereby avoided the peak-to-peak value of signal of each carriers carry superimposed, reduced the signal peak-to-average ratio of multicarrier system.And method and apparatus of the present invention can not make ACLR index and EVM index worsen, and can not increase extra amount of calculation yet, and the input of current communication standard and receiving terminal is not produced any influence, and system realizes simple.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a method that reduces the signal peak-to-average ratio of multicarrier system is characterized in that, this method comprises:
After in the signal of each carriers carry, inserting training sequence midamble sign indicating number, in the signal of each carriers carry, introduce different retardations, and then the described signal that superposes.
2. the method for claim 1 is characterized in that, and is described insert the midamble sign indicating number in the signal of each carriers carry after, introduces different retardations and comprise in the signal of each carriers carry:
After in the signal of each carriers carry, inserting the midamble sign indicating number and before the signal to each carriers carry carries out intermediate frequency process, in the signal of each carriers carry, introduce different retardations.
3. the method for claim 1 is characterized in that, and is described insert the midamble sign indicating number in the signal of each carriers carry after, introduces different retardations and comprise in the signal of each carriers carry:
After the signal to each carriers carry carries out intermediate frequency process and before the signal of each carriers carry of stack, in the signal of each carriers carry, introduce different retardations.
4. as the described method of the arbitrary claim of claim 1 to 3, it is characterized in that described intermediate frequency process comprises interpolation filtering and Digital Up Convert.
5. as the described method of the arbitrary claim of claim 1 to 3, it is characterized in that the channel estimation window length that the value of described retardation is not more than the signal receiving end correspondence deducts the difference of actual channel time delay gained of the channel of the carrier wave correspondence of introducing this retardation.
6. a device that reduces the signal peak-to-average ratio of multicarrier system is characterized in that, this device comprises retardation introducing module and signal laminating module;
Described retardation is introduced module, and the signal that has been used for inserting of each carriers carry the midamble sign indicating number is introduced different retardations, and the signal of retardation has been introduced in output;
Described signal laminating module is used to receive the signal of having introduced retardation, and to the signal that the receives back output that superposes.
7. device as claimed in claim 6 is characterized in that, described retardation is introduced module and comprised that retardation provides module and Postponement module;
Described retardation provides module, is used to produce or store different retardations;
Described Postponement module, the signal of midamble sign indicating number that received inserting of each carriers carry provides module to receive or obtain different retardations from retardation, is incorporated in the described signal described retardation and output.
8. device as claimed in claim 6 is characterized in that, this device also comprises the baseband signal processing module that carries out base band signal process and carries out the intermediate-freuqncy signal processing module that intermediate-freuqncy signal is handled;
Described retardation is introduced module and is connected between described baseband signal processing module and the described intermediate-freuqncy signal processing module, and described intermediate-freuqncy signal processing module links to each other with described signal laminating module.
9. device as claimed in claim 6 is characterized in that, this device also comprises the baseband signal processing module that carries out base band signal process and carries out the intermediate-freuqncy signal processing module that intermediate-freuqncy signal is handled;
Described baseband signal processing module links to each other with described intermediate-freuqncy signal processing module, and described retardation is introduced module and is connected between described intermediate-freuqncy signal processing module and the described signal laminating module.
10. install as claimed in claim 8 or 9, it is characterized in that,
The base band signal process that described baseband signal processing module carries out comprises: the signal to each carriers carry is modulated, spectrum-spreading and scrambling and insertion midamble sign indicating number;
The intermediate-freuqncy signal that described intermediate-freuqncy signal processing module is carried out is handled and comprised: the signal to each carriers carry carries out interpolation filtering and Digital Up Convert.
CN2009100840198A 2009-05-12 2009-05-12 Method and device for lowering signal peak-to-mean ratio of multi-carrier system Pending CN101888694A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012100377A1 (en) * 2011-01-30 2012-08-02 Telefonaktiebolaget L M Ericsson (Publ) A method and arrangement for training sequence allocation
CN110708268A (en) * 2019-09-25 2020-01-17 维沃移动通信有限公司 Signal modulation device and terminal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012100377A1 (en) * 2011-01-30 2012-08-02 Telefonaktiebolaget L M Ericsson (Publ) A method and arrangement for training sequence allocation
CN110708268A (en) * 2019-09-25 2020-01-17 维沃移动通信有限公司 Signal modulation device and terminal
US11817992B2 (en) 2019-09-25 2023-11-14 Vivo Mobile Communication Co., Ltd. Signal modulation device and terminal

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