CN110099018B - Carrier phase recovery method and device in MC-OQAM system - Google Patents
Carrier phase recovery method and device in MC-OQAM system Download PDFInfo
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Abstract
The invention provides a carrier phase recovery method and device in an MC-OQAM system, which are characterized in that a first phase of the first N symbols of each path of subcarrier in M paths of subcarriers is obtained through a Blind Phase Search (BPS) algorithm; acquiring a linear relation of the ith path of subcarriers according to a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm; performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbols; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith sub-carrier according to the linear relation of the ith sub-carrier to obtain the first phase of the (N + r) th symbol of the ith sub-carrier, thereby improving the accuracy of phase estimation and the carrier phase recovery capability of the MC-OQAM system.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a carrier phase recovery method and apparatus in an MC-OQAM system.
Background
With the increasing requirements of communication networks on information transmission, the multi-carrier technology is widely applied. Among them, Multi-carrier interleaved quadrature amplitude modulation (MC-OQAM) is a technology supporting subcarrier multiplexing, and has attracted attention due to its advantages of high spectrum utilization rate, strong inter-symbol interference resistance, and simple implementation. Compared with a single carrier system with the same information rate, the MC-OQAM system has less constellation diagram information of signals in a unit time of a single subcarrier and poorer carrier phase recovery capability.
At present, the best method for carrier phase recovery is a Blind Phase Search (BPS) algorithm, which first performs multipath phase deflection on signals, feeds all deflected signals into a decision circuit, calculates the squared distance to the nearest constellation point, then adds the symbol distances deflected by the same angle, and determines the "best" phase angle by searching the minimum sum of the distance values.
However, in the MC-OQAM system, the estimated phase accuracy is poor when the BPS algorithm is used to perform phase estimation on each subcarrier individually.
Disclosure of Invention
The invention provides a carrier phase recovery method and a carrier phase recovery device in an MC-OQAM system, which are used for improving the carrier phase recovery capability of the MC-OQAM system.
In a first aspect, the present invention provides a carrier phase recovery method in an MC-OQAM system, including:
obtaining first phases of first N symbols of each path of subcarriers in M paths of subcarriers by a Blind Phase Search (BPS) algorithm, wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2;
acquiring a linear relation of the ith path of subcarriers according to a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N;
acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1;
performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbols;
and performing phase compensation on the reference phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier to obtain the first phase of the N + r symbol of the ith path of subcarrier.
Further, the jointly processing the initial phases of the N + r symbols of the M subcarriers to obtain the reference phase of the N + r-th symbol includes:
and acquiring the average phase of the N + r symbol according to the initial phase of the N + r symbol of the M paths of subcarriers, and taking the average phase as a reference phase.
Further, the performing phase compensation on the reference phase of the N + r th symbol of the ith subcarrier according to the linear relationship of the ith subcarrier to obtain the first phase of the N + r th symbol of the ith subcarrier includes:
obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier;
and adding the average phase of the N + r symbols and the compensation phase of the N + r symbols of the ith sub-carrier to obtain the first phase of the N + r symbols of the ith sub-carrier.
Further, the obtaining a compensation phase of the N + r th symbol of the ith subcarrier according to the linear relationship of the ith subcarrier includes:
according toFormula (II)
And obtaining the compensation phase of the N + r symbol of the ith path of subcarrier.
Wherein the content of the first and second substances,
a compensated phase for the N + r symbol of the ith subcarrieri、biIs the linear coefficient of the ith path of sub-carrier.
Further, the obtaining a linear relationship between the ith subcarrier according to the first phase of the jth symbol of the ith subcarrier and the first phase of the jth symbol of the 1 st subcarrier includes:
and obtaining the linear relation of the ith path of subcarriers by fitting a function, the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
In a second aspect, the present invention provides a carrier phase recovery apparatus in an MC-OQAM system, including:
an obtaining module, configured to obtain, through a blind phase search BPS algorithm, first phases of first N symbols of each of M subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2;
the obtaining module is further configured to obtain a linear relationship between the ith subcarrier according to a first phase of a jth symbol of the ith subcarrier and a first phase of a jth symbol of the 1 st subcarrier, where i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N;
the obtaining module is further configured to obtain an initial phase of an N + r-th symbol of each path of subcarrier through a BPS algorithm, where r is an integer greater than or equal to 1;
the obtaining module is further configured to perform joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain a reference phase of the N + r th symbol;
and the processing module is used for performing phase compensation on the reference phase of the N + r th symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier to obtain the first phase of the N + r th symbol of the ith path of subcarrier.
Further, the obtaining module is specifically configured to obtain an average phase of the N + r th symbol according to the initial phase of the N + r th symbol of the M paths of subcarriers, and use the average phase as a reference phase.
Further, the processing module is specifically configured to:
obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier;
and adding the average phase of the N + r symbols and the compensation phase of the N + r symbols of the ith sub-carrier to obtain the first phase of the N + r symbols of the ith sub-carrier.
Further, the processing module is specifically configured to determine a formula
And obtaining the compensation phase of the N + r symbol of the ith path of subcarrier.
Wherein the content of the first and second substances,
a compensated phase for the N + r symbol of the ith subcarrieri、biIs the linear coefficient of the ith path of sub-carrier.
Further, the obtaining module is specifically configured to obtain a linear relationship of the ith subcarrier by fitting a function, and a first phase of a jth symbol of the ith subcarrier and a first phase of a jth symbol of the 1 st subcarrier.
According to the carrier phase recovery method and device in the MC-OQAM system, the first phases of the first N symbols of each path of subcarrier in M paths of subcarriers are obtained through a Blind Phase Search (BPS) algorithm, wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; acquiring a linear relation of the ith path of subcarriers according to a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbols; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith sub-carrier according to the linear relation of the ith sub-carrier to obtain the first phase of the (N + r) th symbol of the ith sub-carrier, so that the estimated phases of all the sub-carriers are linked, the accuracy of the estimated phase is improved, and the carrier phase recovery capability of the MC-OQAM system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a first embodiment of a carrier phase recovery method in an MC-OQAM system according to the present invention;
fig. 2 is a schematic flowchart of a second embodiment of a carrier phase recovery method in the MC-OQAM system according to the present invention;
fig. 3 is a schematic flowchart of a third embodiment of a carrier phase recovery method in the MC-OQAM system according to the present invention;
fig. 4 is a schematic flowchart of a fourth embodiment of a carrier phase recovery method in the MC-OQAM system according to the present invention;
fig. 5 is a schematic structural diagram of a first embodiment of a carrier phase recovery apparatus in an MC-OQAM system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The method comprises the steps of obtaining first phases of first N symbols of each path of subcarrier in M paths of subcarriers through a Blind Phase Search (BPS) algorithm, wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; acquiring a linear relation of the ith path of subcarriers according to a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbols; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain the first phase of the (N + r) th symbol of the ith subcarrier, so that the estimated phases of all subcarriers are linked, the accuracy of the estimated phase is improved, and the carrier phase recovery capability of the MC-OQAM system is improved.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic flow chart of a first embodiment of a carrier phase recovery method in an MC-OQAM system according to the present invention, as shown in fig. 1, the method of this embodiment may include:
s101, acquiring first phases of the first N symbols of each path of subcarrier in the M paths of subcarriers through a BPS algorithm.
Wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2.
The MC-OQAM signal consists of M paths of mutually independent subcarriers, each path of subcarrier can support a high-order modulation format, and staggered offset is introduced between an in-phase component and an orthogonal component of the signal, so that the subcarriers have orthogonality and crosstalk among the subcarriers cannot be generated.
S102, acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
Wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N.
Because adjacent subcarrier signals in the MC-OQAM system have close phase noise deflection values at the same moment, the phase of each subcarrier has a linear relation after analysis and research. And taking the first phase of the jth symbol of the 1 st path of subcarriers as a reference to obtain the linear relation between the rest subcarriers and the 1 st path of subcarriers.
S103, acquiring the initial phase of the N + r symbol of each path of subcarrier through a BPS algorithm.
Wherein r is an integer of 1 or more.
And acquiring a corresponding initial phase for the symbol behind the Nth symbol of each path of subcarrier through a BPS algorithm.
S104, carrying out joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbol.
S105, performing phase compensation on the reference phase of the N + r th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain a first phase of the N + r th symbol of the ith subcarrier.
The BPS algorithm applies feedforward configuration, the phase of the current symbol is obtained according to the phase estimation after the compensation of the previous symbol, the first phase obtained after the compensation of the (N + r) th symbol is brought into the BPS algorithm, and the steps S103 to S105 are repeated to obtain the first phases of the rest symbols.
In this embodiment, a BPS algorithm is used to obtain first phases of first N symbols of each of M paths of subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; carrying out joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbol; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain the first phase of the (N + r) th symbol of the ith subcarrier, so that the estimated phase obtained by combining the phase relation among the subcarriers has higher accuracy, and the carrier phase recovery capability of the MC-OQAM system is improved.
Fig. 2 is a schematic flow chart of a second embodiment of a carrier phase recovery method in an MC-OQAM system according to the present invention, and fig. 2 is a description of a specific implementation manner of the method shown in fig. 1 based on the embodiment shown in fig. 1, as shown in fig. 2:
s201, acquiring first phases of the first N symbols of each path of subcarrier in the M paths of subcarriers through a BPS algorithm.
Wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2.
S202, acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
Wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N.
And S203, acquiring the initial phase of the N + r symbol of each path of subcarrier through a BPS algorithm.
Wherein r is an integer of 1 or more.
S204, acquiring the average phase of the N + r symbol according to the initial phase of the N + r symbol of the M paths of subcarriers, and taking the average phase as a reference phase.
The average phase of the N + r-th symbol is obtained by the following formula (1):
wherein the content of the first and second substances,
is the average phase of the N + r-th symbol,
is the initial phase of the N + r symbol of the ith subcarrier, ai、biM is the number of subcarriers, which is a linear coefficient of the ith subcarrier.
S205, performing phase compensation on the reference phase of the N + r th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain a first phase of the N + r th symbol of the ith subcarrier.
In this embodiment, a BPS algorithm is used to obtain first phases of first N symbols of each of M paths of subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; acquiring the average phase of the N + r symbol according to the initial phase of the N + r symbol of the M paths of subcarriers, and taking the average phase as a reference phase; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain the first phase of the (N + r) th symbol of the ith subcarrier, so that the estimated phase obtained through the phase relation between the average phase and each subcarrier has higher accuracy, and the carrier phase recovery capability of the MC-OQAM system is improved.
Fig. 3 is a schematic flow chart of a third embodiment of a carrier phase recovery method in an MC-OQAM system according to the present invention, and fig. 3 is a description of a specific implementation manner of the method shown in fig. 2 based on the embodiment shown in fig. 2, as shown in fig. 3:
s301, acquiring first phases of the first N symbols of each path of subcarriers in the M paths of subcarriers through a BPS algorithm.
Wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2.
S302, acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
Wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N.
And S303, acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm.
Wherein r is an integer of 1 or more.
S304, according to the initial phase of the (N + r) th symbol of the M paths of subcarriers, acquiring the average phase of the (N + r) th symbol, and taking the average phase as a reference phase.
The average phase of the N + r th symbol is obtained by equation (1) in S204:
wherein the content of the first and second substances,
is the average phase of the N + r-th symbol,
is the initial phase of the N + r symbol of the ith subcarrier, ai、biM is the number of subcarriers, which is a linear coefficient of the ith subcarrier.
S305, obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier.
S306, adding the average phase of the (N + r) th symbol and the compensation phase of the (N + r) th symbol of the ith sub-carrier to obtain the first phase of the (N + r) th symbol of the ith sub-carrier.
Obtaining a first phase of the N + r symbol of the ith subcarrier by the following formula (2):
wherein the content of the first and second substances,
is the first phase of the N + r symbol of the ith subcarrier,
is the average phase of the N + r-th symbol,
the compensated phase of the N + r symbol of the ith subcarrier.
In this embodiment, a BPS algorithm is used to obtain first phases of first N symbols of each of M paths of subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; acquiring a linear relation of the ith path of subcarriers according to the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; acquiring the average phase of the N + r symbol according to the initial phase of the N + r symbol of the M paths of subcarriers, and taking the average phase as a reference phase; obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier; and adding the average phase of the (N + r) th symbol and the compensation phase of the (N + r) th symbol of the ith sub-carrier to obtain the first phase of the (N + r) th symbol of the ith sub-carrier, so that the estimated phase obtained by the phase relation between the average phase and each sub-carrier has higher accuracy, and the carrier phase recovery capability of the MC-OQAM system is improved.
Optionally, one possible implementation manner of step S305 is:
the compensated phase of the N + r symbol of the ith subcarrier is obtained by the following formula (3):
wherein the content of the first and second substances,
a compensated phase for the N + r symbol of the ith subcarrieri、biIs the linear coefficient of the ith path of sub-carrier.
Fig. 4 is a schematic flowchart of a fourth embodiment of a carrier phase recovery method in an MC-OQAM system according to the present invention, and fig. 4 is a description of a specific implementation manner of the method shown in fig. 1 based on the embodiment shown in fig. 1, as shown in fig. 4:
s401, acquiring first phases of the first N symbols of each path of subcarriers in the M paths of subcarriers through a BPS algorithm.
Wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2.
S402, obtaining the linear relation of the ith path of subcarriers by fitting a function, and the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
Wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N.
According to the first phase of the first N symbols of each path of subcarriers in the M paths of subcarriers, taking the first phase of the 1 st path of subcarriers as a reference, and fitting a functionObtaining the linear coefficient a between the rest sub-carriers and the 1 st path sub-carrieri、biAs shown in the following equation (4):
wherein, ai、biIs the linear coefficient of the ith sub-carrier, X is the number of symbols of the ith sub-carrier,
is the first phase of the xth symbol of the ith subcarrier,
is the first phase of the xth symbol of the 1 st subcarrier.
And S403, acquiring the initial phase of the N + r th symbol of each path of subcarrier through a BPS algorithm.
Wherein r is an integer of 1 or more.
S404, carrying out combined processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbol.
S405, performing phase compensation on the reference phase of the N + r th symbol of the ith sub-carrier according to the linear relation of the ith sub-carrier to obtain a first phase of the N + r th symbol of the ith sub-carrier.
In this embodiment, a BPS algorithm is used to obtain first phases of first N symbols of each of M paths of subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; obtaining a linear relation of the ith path of subcarriers by fitting a function, a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1; carrying out joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbol; and performing phase compensation on the reference phase of the (N + r) th symbol of the ith subcarrier according to the linear relation of the ith subcarrier to obtain the first phase of the (N + r) th symbol of the ith subcarrier, so that the estimated phase obtained by combining the phase relation among the subcarriers has higher accuracy, and the carrier phase recovery capability of the MC-OQAM system is improved.
Fig. 5 is a schematic structural diagram of a first embodiment of a carrier phase recovery apparatus in an MC-OQAM system according to the present invention, and as shown in fig. 5, the apparatus of the present embodiment includes an obtaining module 501 and a processing module 502.
The obtaining module 501 is configured to obtain first phases of first N symbols of each of M paths of subcarriers by using a blind phase search BPS algorithm, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2; the obtaining module 501 is further configured to obtain a linear relationship between the ith subcarrier and the ith symbol according to a first phase of the jth symbol of the ith subcarrier and a first phase of the jth symbol of the 1 st subcarrier, where i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N; the obtaining module 501 is further configured to obtain an initial phase of an N + r th symbol of each path of subcarriers through a BPS algorithm, where r is an integer greater than or equal to 1; the obtaining module 501 is further configured to perform joint processing on the initial phases of the N + r symbols of the M paths of subcarriers, and obtain a reference phase of the N + r th symbol; the processing module 502 is configured to perform phase compensation on the reference phase of the N + r th symbol of the ith subcarrier according to the linear relationship of the ith subcarrier, so as to obtain a first phase of the N + r th symbol of the ith subcarrier.
Optionally, the obtaining module 501 is specifically configured to obtain an average phase of the N + r th symbol according to the initial phase of the N + r th symbol of the M paths of subcarriers, and use the average phase as a reference phase.
Optionally, the processing module 502 is specifically configured to:
obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier;
and adding the average phase of the N + r symbols and the compensation phase of the N + r symbols of the ith sub-carrier to obtain the first phase of the N + r symbols of the ith sub-carrier.
Optionally, the processing module 502 is specifically configured to calculate the formula
And obtaining the compensation phase of the N + r symbol of the ith path of subcarrier.
Wherein the content of the first and second substances,
a compensated phase for the N + r symbol of the ith subcarrieri、biIs the linear coefficient of the ith path of sub-carrier.
Optionally, the obtaining module 501 is specifically configured to obtain the linear relationship of the ith subcarrier by fitting a function, and a first phase of a jth symbol of the ith subcarrier and a first phase of a jth symbol of the 1 st subcarrier.
The apparatus of this embodiment may be used in the technical solutions of any of the above embodiments of the present invention, and the implementation principles and technical effects are similar, which are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A carrier phase recovery method in an MC-OQAM system is characterized by comprising the following steps:
obtaining first phases of first N symbols of each path of subcarriers in M paths of subcarriers by a Blind Phase Search (BPS) algorithm, wherein M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2;
acquiring a linear relation of the ith path of subcarriers according to a first phase of a jth symbol of the ith path of subcarriers and a first phase of a jth symbol of the 1 st path of subcarriers, wherein i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N;
acquiring the initial phase of the (N + r) th symbol of each path of subcarrier through a BPS algorithm, wherein r is an integer greater than or equal to 1;
performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r symbols;
performing phase compensation on the reference phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier to obtain a first phase of the N + r symbol of the ith path of subcarrier;
the performing joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain the reference phase of the N + r th symbol includes:
acquiring the average phase of the N + r symbol according to the initial phase of the N + r symbol of the M paths of subcarriers, and taking the average phase as a reference phase;
obtaining an average phase of the N + r-th symbol by the following formula:
wherein the content of the first and second substances,
is the average phase of the N + r-th symbol,
is the initial phase of the N + r symbol of the ith subcarrier, ai、biM is the number of the subcarriers as the linear coefficient of the ith subcarrier.
2. The method according to claim 1, wherein the phase compensating the reference phase of the N + r th symbol of the ith subcarrier according to the linear relationship of the ith subcarrier to obtain the first phase of the N + r th symbol of the ith subcarrier comprises:
obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier;
and adding the average phase of the N + r symbols and the compensation phase of the N + r symbols of the ith sub-carrier to obtain the first phase of the N + r symbols of the ith sub-carrier.
3. The method according to claim 2, wherein the obtaining the compensated phase of the N + r th symbol of the ith subcarrier according to the linear relationship of the ith subcarrier comprises:
according to the formula
Obtaining the compensation phase of the N + r symbol of the ith path of subcarrier;
wherein the content of the first and second substances,
and the compensation phase is the (N + r) th symbol of the ith sub-carrier.
4. The method according to claim 1, wherein the obtaining the linear relationship of the ith subcarrier according to the first phase of the jth symbol of the ith subcarrier and the first phase of the jth symbol of the 1 st subcarrier comprises:
and obtaining the linear relation of the ith path of subcarriers by fitting a function, the first phase of the jth symbol of the ith path of subcarriers and the first phase of the jth symbol of the 1 st path of subcarriers.
5. A carrier phase recovery apparatus in an MC-OQAM system, comprising:
an obtaining module, configured to obtain, through a blind phase search BPS algorithm, first phases of first N symbols of each of M subcarriers, where M is an integer greater than or equal to 2, and N is an integer greater than or equal to 2;
the obtaining module is further configured to obtain a linear relationship between the ith subcarrier according to a first phase of a jth symbol of the ith subcarrier and a first phase of a jth symbol of the 1 st subcarrier, where i is greater than or equal to 2 and less than or equal to M, and j is greater than or equal to 1 and less than or equal to N;
the obtaining module is further configured to obtain an initial phase of an N + r-th symbol of each path of subcarrier through a BPS algorithm, where r is an integer greater than or equal to 1;
the obtaining module is further configured to perform joint processing on the initial phases of the N + r symbols of the M paths of subcarriers to obtain a reference phase of the N + r th symbol;
the processing module is used for performing phase compensation on the reference phase of the (N + r) th symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier to obtain a first phase of the (N + r) th symbol of the ith path of subcarrier;
the obtaining module is specifically configured to obtain an average phase of an N + r th symbol according to an initial phase of the N + r th symbol of the M paths of subcarriers, and use the average phase as a reference phase;
obtaining an average phase of the N + r-th symbol by the following formula:
wherein the content of the first and second substances,
is the average phase of the N + r-th symbol,
is the initial phase of the N + r symbol of the ith subcarrier, ai、biM is the number of the subcarriers as the linear coefficient of the ith subcarrier.
6. The apparatus of claim 5, wherein the processing module is specifically configured to:
obtaining the compensation phase of the N + r symbol of the ith path of subcarrier according to the linear relation of the ith path of subcarrier;
and adding the average phase of the N + r symbols and the compensation phase of the N + r symbols of the ith sub-carrier to obtain the first phase of the N + r symbols of the ith sub-carrier.
7. The apparatus of claim 6, wherein the processing module is specifically configured to perform the processing according to a formula
Obtaining the compensation phase of the N + r symbol of the ith path of subcarrier;
wherein the content of the first and second substances,
and the compensation phase is the (N + r) th symbol of the ith sub-carrier.
8. The apparatus according to claim 5, wherein the obtaining module is specifically configured to obtain the linear relationship of the ith subcarrier by fitting a function, and a first phase of a jth symbol of the ith subcarrier and a first phase of a jth symbol of the 1 st subcarrier.
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