CN102461279A - Method of and base station for reducing peak - to - average power ratio for a multicarrier transmission - Google Patents

Method of and base station for reducing peak - to - average power ratio for a multicarrier transmission Download PDF

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CN102461279A
CN102461279A CN2009801598170A CN200980159817A CN102461279A CN 102461279 A CN102461279 A CN 102461279A CN 2009801598170 A CN2009801598170 A CN 2009801598170A CN 200980159817 A CN200980159817 A CN 200980159817A CN 102461279 A CN102461279 A CN 102461279A
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phase shift
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sub
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郭志恒
缪庆育
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Ericsson China Communications Co Ltd
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    • H—ELECTRICITY
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • 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
    • H04L27/2621—Reduction thereof using phase offsets between subcarriers

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Abstract

A method (500) of and a BS (402) for reducing a PAPR for a multicarrier transmission in a cell in a TD-SCDMA system are provided. The method (500) comprises the steps of determining (502) an index of a basic midamble code of the cell and an index of each carrier of carriers used for the multicarrier transmission in the cell; for each carrier used for the multicarrier transmission in the cell, looking up (504) a phase shift in a table of phase shifts according to the index of the basic midamble code of the cell and the index of the carrier, and applying (506) the looked-up phase shift to the carrier. Each phase shift in the table of phase shifts has been optimized for PAPR reduction.

Description

For transmitting, multicarrier reduces method and the base station of peak value to average power ratio
Technical field
The present invention relates generally to TD SDMA (TD-SCDMA) system, and more particularly, the multicarrier that is related in the sub-district in the TD-SCDMA system transmits the reduction peak value to average power ratio (PAPR).
Background technology
TD-SCDMA is one of third generation partner program (3GPP) standard.Physical channel in the TD-SCDMA system is a kind of burst, transmits in its particular time-slot in the radio frame that distributes.The duration of burst is a time slot.Fig. 1 schematically illustrates a kind of structure of burst, it comprise in order 352 chips that are used for data symbol piece, be used for synchronous 144 chips of (midamble) piece, be used for data symbol 352 chips piece and be used for the piece of 16 chips of protection period (GP).Be used for channel estimating synchronously in the middle of the burst.
The use of multi-transceiver technology can make base station (BS) support more users in the TD-SCDMA system, and therefore reduces the quantity of BS greatly, thereby reduces the investment of Virtual network operator.The typical multicarrier that Fig. 2 schematically illustrates in the sub-district in the TD-SCDMA system transmits.The cyclic shift version that comprises a given basic middle synchronous code of a plurality of carrier waves uses of main carrier wave and less important carrier wave in the sub-district.The cyclic shift version of each self-contained given basic middle synchronous code of a plurality of baseband signals also makes up through a plurality of carrier modulation subsequently.The signal of combination will carry out radio frequency (RF) modulation and transmit through the antenna (not shown) subsequently.
Because the TD-SCDMA system is synchro system, and it is identical to be used for the basic synchronous code of a plurality of carrier waves, therefore, compares with the PAPR of the data symbol field of the signal of transmission, and the PAPR of the middle synchronization field of the signal of transmission is high.High PAPR will impel the signal entering nonlinear area of transmission, and therefore produce distorted signals and strong spectrum leakage, thereby cause the performance degradation of system.
Therefore, most important for the transmission of the multicarrier in the sub-district in TD-SCDMA system reduction PAPR.In order to reduce PAPR, prior art has been proposed various solutions, like block encoding, slicing etc.Yet the realization of block encoding is very complicated for the TD-SCDMA system.Slicing often causes the performance degradation of error vector value (EVM).
What noticed is, the multicarrier that one Chinese patent application CN1953361A discloses in the sub-district in a kind of TD-SCDMA system transmits, and wherein, shown in Fig. 3 signal, phase shift is used to reduce PAPR.The cyclic shift version of each self-contained given basic middle synchronous code of a plurality of baseband signals, they at first carry out phase shift through corresponding phase shift factor.Dephased signal will carry out carrier modulation and RF modulation, and transmits through the antenna (not shown) subsequently.
Yet this disclosed method has a plurality of shortcomings.For example, in case phase shift factor is determined, they will not change when synchronous code changes in basic.Therefore, this disclosed method is dumb in reality realizes.In addition, the introducing of phase shift is at the baseband signal place away from the final signal that transmits, and this will cause so not desirable effect in the PAPR reduction.
Summary of the invention
Therefore, an object of the present invention is through being provided for solving above-mentioned advantage for the multicarrier in the sub-district in the TD-SCDMA system transmits method and the BS that reduces PAPR.
According to an aspect of the present invention, provide a kind of for the multicarrier in the sub-district in the TD-SCDMA system transmits the method that reduces PAPR, wherein, the number of carriers N in the sub-district is more than or equal to two.This method may further comprise the steps: the index of the index of confirming synchronous code in sub-district basic and each carrier wave that is used for N the carrier wave that the sub-district multicarrier transmits; For being used for each carrier wave that the sub-district multicarrier transmits,, in the phase shift table, search phase shift according to the index of synchronous code in sub-district basic and the index of this carrier wave; And the phase shift of finding is applied to this carrier wave, wherein each phase shift in the phase shift table reduces optimised for PAPR.
In an embodiment of this method, when the manufacturing/configuration BS of factory, the phase shift indumentum is stored among the said BS that comprises in the TD-SCDMA system.
In an embodiment of this method, dynamically generated among the BS that the phase shift table comprises in the TD-SCDMA system.
In an embodiment of this method, the phase shift table changes according to the quantity of carrier wave in the sub-district and/or the frequency separation between the adjacent carrier.
In an embodiment of this method, the optimization of each phase shift is carried out in digital intermediate frequency territory in the phase shift table.Preferably, basic middle synchronous code converts digital intermediate frequency signal to by root raised cosine (RRC) filter.
In an embodiment of this method, be assigned in the group of sub-district all basic in synchronous code PAPR in the phase shift table according to its optimization sort.
In an embodiment of this method, be assigned to synchronous code in the PAPR that has minimum optimization in the group of sub-district basic and during the network planning, be selected as synchronous code in this sub-district basic.
Implement in the row in one of this method, the phase shift that finds is applied to this carrier wave comprises this carrier wave multiply by the phase shift that finds.
In an embodiment of this method, the quantity of all available basic middle synchronous codes is 128 in the TD-SCDMA system.
According to a further aspect in the invention, provide a kind of for the multicarrier in the sub-district in the TD-SCDMA system transmits the BS that reduces PAPR, wherein, the number of carriers N in the sub-district is more than or equal to two.BS comprises one or more treatment circuits, and it is configured to: the index of the index of confirming synchronous code in sub-district basic and each carrier wave that is used for N the carrier wave that the sub-district multicarrier transmits; For being used for each carrier wave that the sub-district multicarrier transmits, according to the index of synchronous code in sub-district basic and the index of this carrier wave, in the phase shift table, search phase shift, wherein each phase shift in the phase shift table is optimised for the PAPR reduction; And the phase shift that finds is applied to this carrier wave.
In the embodiment of this BS, when the said BS of factory's manufacturing/configuration, the phase shift indumentum is stored among the said BS.
In the embodiment of this BS, the phase shift table is dynamically generated in this BS.
In the embodiment of this BS, the phase shift table changes according to the quantity of carrier wave in the sub-district and/or the frequency separation between the adjacent carrier.
In the embodiment of this BS, the optimization of each phase shift is carried out in digital intermediate frequency territory in the phase shift table.Preferably, basic middle synchronous code converts digital intermediate frequency signal to by the RRC filter.
In the embodiment of this BS, be assigned in the group of sub-district all basic in synchronous code PAPR in the phase shift table according to its optimization sort.
In the embodiment of this BS, be assigned to synchronous code in the PAPR that has minimum optimization in the group of sub-district basic and during the network planning, be selected as synchronous code in sub-district basic.
In the embodiment of this BS, said one or more treatment circuits are configured to through this carrier wave multiply by the phase shift that finds and the phase shift that finds is applied to this carrier wave.
In the embodiment of this BS, the quantity of all available basic middle synchronous codes is 128 in the TD-SCDMA system.
Description of drawings
From of the present inventionly describing more specifically below in conjunction with accompanying drawing is described, above-mentioned and others, feature and advantage of the present invention will be more obvious, wherein:
Fig. 1 schematically illustrates the structure of a kind of burst in the TD-SCDMA system;
The typical multicarrier that Fig. 2 schematically illustrates in the sub-district in the TD-SCDMA system transmits;
The multicarrier that Fig. 3 schematically illustrates in the sub-district of TD-SCDMA system that phase shift is used for reducing PAPR transmits;
Fig. 4 is the schematic block diagram according to the BS that is used to the multicarrier transmission reduction PAPR in the sub-district in the TD-SCDMA system of one embodiment of the invention;
Fig. 5 is the flow chart that schematically illustrates according to the method that is used to the multicarrier transmission reduction PAPR in the sub-district in the TD-SCDMA system of one embodiment of the invention;
Fig. 6 schematically illustrates according to the multicarrier in the sub-district in the TD-SCDMA system of an example embodiment of the present invention and transmits; And
Fig. 7 schematically illustrates the unoptimizable and the analog result of optimizing PAPR for 128 basic middle synchronous codes with 9 carrier waves.
At several diagrammatic sketch of figure everywhere, the corresponding corresponding assembly of reference character indication.
Embodiment
Following embodiment states essential information so that those skilled in the art can put into practice the present invention, and illustrates and put into practice optimal mode of the present invention.When below according to advantages, describing, it should be appreciated by those skilled in the art that notion of the present invention, and will recognize the not application of special these notions that propose among this paper.Should be understood that these notions and use in the scope that drops on the disclosure and the claim of enclosing.
In the description of this specification and claim everywhere, term " BS " includes but not limited to is base station, Node B, enode b (eNode-B) or has radio transmission/receiving ability, is used for providing in part TD-SCDMA system the device of any other type that radio covers.
Fig. 4 is the schematic block diagram according to the BS 402 that is used to the multicarrier transmission reduction PAPR in the sub-district in the TD-SCDMA system of one embodiment of the invention.The multicarrier that N carrier wave is used in the sub-district of TD-SCDMA system transmits, and wherein, N is more than or equal to two.BS 402 comprises one or more treatment circuits 404.
The index of index that said one or more treatment circuit 404 is configured to confirm synchronous code in sub-district basic and each carrier wave that is used for N the carrier wave that the sub-district multicarrier transmits.Said one or more treatment circuit 404 also is configured to the index of the basic middle synchronous code of basis and the index of each carrier wave is searched phase shift for each carrier wave that is used for sub-district multicarrier transmission in the phase shift table; And the phase shift of finding is applied to carrier wave; For example, carrier wave multiply by the phase shift of finding.Each phase shift in the phase shift table is optimized for PAPR reduces.
Should be understood that said one or more treatment circuit 404 can comprise hardware, firmware, software or its any combination.In at least one embodiment, said one or more treatment circuit 404 comprises and is programmed for one or more general or special microprocessor and/or the digital signal processor of execution corresponding to the operation of the method step that is described below.This type of instruction can be embodied as the one or more computer programs that comprise program stored instruction in the memory element (for example, memory).
With reference to Fig. 5, this figure schematically illustrates the flow chart of the method 500 of the multicarrier transmission reduction PAPR in the sub-district that is used in the TD-SCDMA system according to one embodiment of the invention.N carrier wave is used for the multicarrier transmission of sub-district, and wherein, N is more than or equal to two.Should be understood that this method be not necessarily limited to shown in the order, some steps can be omitted when needed, and some steps can be carried out together or with the mode of cross-correlation.
This method is from step 502 beginning, wherein, when cell setting, the index of index that the BS that comprises in the TD-SCDMA system confirms synchronous code in sub-district basic and each carrier wave that is used for N the carrier wave that the sub-district multicarrier transmits.
Subsequently, in step 504, BS searches phase shift for each carrier wave that is used for sub-district multicarrier transmission according to the index of the basic middle synchronous code of sub-district and the index of carrier wave in the phase shift table.Each phase shift in the phase shift table is optimized for PAPR reduces.
Below in conjunction with Fig. 6, provide an example that how to obtain to reduce the phase shift table of optimizing into PAPR, this illustrated illustrates according to the multicarrier in the sub-district in the TD-SCDMA system of an example embodiment of the present invention and transmits.
Usually, 128 basic middle synchronous codes are arranged in the TD-SCDMA system, synchronous code is divided into 32 groups in these.Each group comprises four basic middle synchronous codes and is assigned to a sub-district.A sub-district will use one of four basic middle synchronous codes as the pilot tone that is used for the channel estimating of down link and up link.Since in the TD-SCDMA system basic in the total quantity of synchronous code be 128, therefore, in the sub-district, carry out under the situation that multicarrier transmits, possibly be all basic in synchronous codes generate the table of optimizing phase shifts.
In this example embodiment of the present invention, middle synchronous code is come over-sampling (or interior inserting) by root raised cosine (RRC) filter of realizing through digital up converter (DUC) in the hardware, and the signal of over-sampling is called digital intermediate frequency signal (with respect to baseband signal).
The middle synchronous code of over-sampling will have 144xr sample, and wherein, r is an over-sampling rate.Suppose that the multicarrier combination back signal in the synchronous code field is provided by following formula
s N, v, a=[s 0, N, v, a, s 1, N, v, a..., s 144 * r-1, N, v, a] equality (1)
Wherein, N is the quantity of carrier wave in the sub-district, and v is the index of the basic middle synchronous code of sub-district, and a is the index of multi-carrier signal, and r is an over-sampling rate, and And m I, vBe v basic in i sample of over-sampling in the middle synchronous code field of synchronous code and a carrier wave, θ N, N, v, aBe the phase shift that is used for n carrier wave, and f nIt is the frequency of n carrier wave.
In order to reduce the PAPR of multi-carrier signal, the phase shift that is used for each carrier wave is dropped to minimum by careful the selection with the PAPR with multicarrier combination back oversampled signals.Below calculating is a kind of possibility mode of searching the optimization phase shift that is used for each carrier wave.
Suppose that the phase shift vector is provided by following formula
Θ N, v, a=[θ 0, N, v, a, θ 1, N, v, a..., θ N-1, N, v, a] equality (2)
Wherein, N is the quantity of carrier wave in the sub-district, and v is the index of the basic middle synchronous code of sub-district, and a is the index of phase shift vector.If θ N, N, v, aCan be any value, then possible Θ N, v, aQuantity will be unlimited.In order to reduce complexity of calculation, realize relative optimal results simultaneously, suppose θ N, N, v, a∈ Φ={ φ 0, φ 1..., φ L-1And 0≤φ l＜2 π, wherein, l=0,1 ..., L-1.So, 1≤a≤(L) NThe typical amounts of L is 2,4 or 8.
s N, v, aPAPR will be
β N , v , a = Max ( | s l , N , v , a | 2 ) / ( Σ j = 0 144 × r - 1 | s j , N , v , a | 2 ) Equality (3)
Subsequently, the phase shift of optimization will be
Θ N , v , Min = Arg Min θ n , N , v , a ∈ Φ ( β N , v , a ) Equality (4)
Θ wherein N, v, min=[θ 0, N, v, min, θ 1, N, v, min..., θ N-1, N, v, min]
Therefore, the optimization phase shift that is used for each carrier wave is
Figure BPA00001480457800073
equality (5)
Wherein, n is the index of carrier wave, and N is the quantity of carrier wave in the sub-district, and v is the index of the basic middle synchronous code of sub-district.
In this way; Can come the phase shift
Figure BPA00001480457800074
of calculation optimization and therefore, the phase shift table that can obtain to optimize through simulation.Table 1 is the example of a part that is used for the optimization phase shift table of 6 carrier waves in sub-district.
Table 1
Figure BPA00001480457800081
The phase shift table that it should be noted that the optimization that obtains through aforementioned calculation generally changes according to the quantity of carrier wave in the sub-district and/or the frequency separation between the adjacent carrier.For example, the value of phase shift is general different with those values that are phase shift in the table of 9 carrier wave acquisitions in the sub-district in the table that obtains for 6 carrier waves in the sub-district.In addition, the frequency separation between the adjacent carrier also influences the value of phase shift.In the TD-SCDMA system, because chip-rate is 1.28MHz, and bandwidth is 1.6MHz, and therefore, the frequency separation between the nearby frequency bands is about 1.6MHz normally.Yet in some cases, the frequency separation between the adjacent carrier can be 1.8MHz, and the value of phase shift therefore can be different.
It shall yet further be noted that the phase shift table of the optimization of acquisition can be stored when the manufacturing/configuration BS of factory in BS.Alternative is that the phase shift table of optimization can dynamically generate in BS.
Can see that from foregoing the optimization of phase shift can be carried out in the table in digital intermediate frequency territory.Because digital intermediate frequency signal more near the signal of final transmission, therefore, can realize the better effect in the PAPR reduction than baseband signal.
In addition, after obtaining the phase shift of optimization through simulation, under the situation of N carrier wave, synchronous code had the PAPR of optimization during each was basic, and this PAPR synchronous code from basic changes to basic middle synchronous code.Fig. 7 schematically illustrates the unoptimizable and the analog result of optimizing PAPR for 128 basic middle synchronous codes with 9 carrier waves.Obviously, belong to the PAPR that phase four the basic middle synchronous codes on the same group that are assigned to the sub-district have different optimization.Therefore, four basic middle synchronous codes can sort by the PAPR according to its optimization in table.In addition, have synchronous code in PAPR basic of minimum optimization in the group and can during the network planning, be selected as synchronous code in sub-district basic.
Refer again to Fig. 5, in step 506, for being used for each carrier wave that the sub-district multicarrier transmits, BS is applied to carrier wave with the phase shift of finding at last, for example, carrier wave multiply by the phase shift of finding so that use in the transmission of the multicarrier in the sub-district.
By means of the phase shift of each carrier wave, the PAPR of multicarrier can reduce greatly.This means for identical power amplifier (PA), can increase maximum average radiating power, and can increase the radio covering.Maximum average radiating power for identical can use the PA that has the narrower range of linearity, and therefore can save cost.
In addition, the present invention is because the use of phase shift table and in reality realizes, be flexibly, and this makes the present invention be applicable to easily to utilize various BS that different multi-carrier transmits and need not the hardware change.
In the description of this specification and claim everywhere; Word " comprises ", the modification of " comprising " and these speech (for example " comprise ... (comprising) " and " comprising (comprises) ") expression " including but not limited to ", and be not intended to (and not) and get rid of other assembly, integral body or step.
In the description of this specification and claim everywhere, odd number is contained plural number, only if additionally requirement of context.Particularly, when using indefinite article, specification is appreciated that for having considered plural number and odd number, only if additionally requirement of context.
To understand,, state the above description of embodiments of the invention in order to illustrate and purpose of description.This description is not exhaustive, and the invention that does not limit institute's prescription is accurate open form.In view of above description, it is possible revising and changing, and perhaps can obtain from putting into practice the present invention.Claim and identity-definition thereof scope of the present invention.

Claims (20)

1. one kind is that multicarrier in the sub-district in TD SDMA (TD-SCDMA) system transmits and reduces the method (500) of peak value to average power ratio (PAPR), and the quantity N of carrier wave said method comprising the steps of more than or equal to two in the wherein said sub-district:
The index of the index of the basic middle synchronous code of definite (502) said sub-district and each carrier wave of N the carrier wave that is used for the transmission of multicarrier described in the said sub-district;
For being used for each carrier wave that multicarrier described in the said sub-district transmits:
According to the index of synchronous code in said sub-district said basic and the index of this carrier wave, in the table of phase shift, search (504) phase shift, each phase shift in the table of wherein said phase shift is optimised for the PAPR reduction; And
The phase shift that is found is used (506) to this carrier wave.
2. the method for claim 1 (500), wherein when factory's manufacturing/configurating base station (BS), the indumentum of said phase shift is stored among the said BS that comprises in the said TD-SCDMA system.
3. the method for claim 1 (500) is dynamically generated in the base station (BS) that the table of wherein said phase shift comprises in said TD-SCDMA system.
4. like each described method (500) of claim 1 to 3, the table of wherein said phase shift changes according to the quantity of carrier wave in the sub-district and/or the frequency separation between the adjacent carrier.
5. like each described method (500) of claim 1 to 4, the optimization of each phase shift is carried out in digital intermediate frequency territory in the table of wherein said phase shift.
6. method as claimed in claim 5 (500), wherein said basic middle synchronous code converts digital intermediate frequency signal to by root raised cosine (RRC) filter.
7. like each described method (500) of claim 1 to 6, wherein be assigned in the group of sub-district all basic in synchronous code PAPR in the table of said phase shift according to its optimization sort.
8. like each described method (500) of claim 1 to 6, wherein be assigned to synchronous code in the PAPR that has minimum optimization in the group of sub-district basic and during the network planning, be selected as synchronous code in said sub-district basic.
9. like each described method (500) of claim 1 to 8, wherein the phase shift application (506) that is found is comprised to this carrier wave this carrier wave multiply by the phase shift that is found.
10. like each described method (500) of claim 1 to 9, in the wherein said TD-SCDMA system all available basic in the quantity of synchronous codes be 128.
11. transmitting, the multicarrier in the sub-district that is used in TD SDMA (TD-SCDMA) system reduces the base station (BS) (402) of peak value to average power ratio (PAPR); The quantity N of carrier wave is more than or equal to two in the wherein said sub-district; Said BS comprises one or more treatment circuits (404), and said treatment circuit is configured to:
The index of the index of the basic middle synchronous code of definite (502) said sub-district and each carrier wave of N the carrier wave that is used for the transmission of multicarrier described in the said sub-district;
For being used for each carrier wave that multicarrier described in the said sub-district transmits:
According to the index of synchronous code in said sub-district said basic and the index of this carrier wave, in the table of phase shift, search (504) phase shift, each phase shift in the table of wherein said phase shift is optimised for the PAPR reduction; And
The phase shift that is found is used (506) to this carrier wave.
12. BS as claimed in claim 9 (402), when wherein making/disposing said base station (BS) in factory, the indumentum of said phase shift is stored among the said BS.
13. BS as claimed in claim 9 (402), the table of wherein said phase shift are dynamically generated in said BS.
14. like each described BS (402) of claim 11 to 13, the table of wherein said phase shift changes according to the quantity of carrier wave in the sub-district and/or the frequency separation between the adjacent carrier.
15. like each described BS (402) of claim 11 to 14, the optimization of each phase shift is carried out in digital intermediate frequency territory in the table of wherein said phase shift.
16. BS as claimed in claim 15 (402), wherein said basic middle synchronous code converts digital intermediate frequency signal to by root raised cosine (RRC) filter.
17. like each described BS (402) of claim 11 to 16, wherein be assigned in the group of sub-district all basic in synchronous code PAPR in the table of said phase shift according to its optimization sort.
18., wherein be assigned to synchronous code in the PAPR that has minimum optimization in the group of sub-district basic and during the network planning, be selected as synchronous code in said sub-district basic like each described BS (402) of claim 11 to 16.
19. like each described BS (402) of claim 11 to 18, wherein said one or more treatment circuits (404) are configured to through this carrier wave being multiply by the phase shift that is found the phase shift that is found used (506) to this carrier wave.
20. like each described BS (402) of claim 11 to 19, in the wherein said TD-SCDMA system all available basic in the quantity of synchronous codes be 128.
CN2009801598170A 2009-06-05 2009-06-05 Method of and base station for reducing peak - to - average power ratio for a multicarrier transmission Pending CN102461279A (en)

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CN101262628A (en) * 2007-03-08 2008-09-10 鼎桥通信技术有限公司 A modulation processing method and transmission device for transmitting data in multi-carrier system
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