CN107196884B - A kind of method and apparatus of signal processing - Google Patents
A kind of method and apparatus of signal processing Download PDFInfo
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- CN107196884B CN107196884B CN201610146544.8A CN201610146544A CN107196884B CN 107196884 B CN107196884 B CN 107196884B CN 201610146544 A CN201610146544 A CN 201610146544A CN 107196884 B CN107196884 B CN 107196884B
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
- H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
Abstract
The embodiment of the present application provides a kind of method and apparatus of signal processing, which comprises receives the signal that terminal is sent by the Physical Uplink Shared Channel PUSCH of current subframe；When the terminal is switched to the Physical Uplink Control Channel PUCCH of next subframe by the Physical Uplink Shared Channel PUSCH of current subframe, extract operation before being executed to the signal；Discrete Fourier transform is carried out to the signal of extract operation before completing, obtains discrete Fourier transform result；According to the discrete Fourier transform result, the signal is compiled, avoid the truncated generation of data, base station is enabled to obtain the data information of the signal integrity, reduce the Block Error Rate (Block Error Ratio) that terminal sends signal, it ensure that the good receptivity of base station side, improve the efficiency of transmission of signal.
Description
Technical field
This application involves fields of communication technology, method and a kind of dress of signal processing more particularly to a kind of signal processing
It sets.
Background technique
LTE (Long Term Evolution, long term evolution) is the development trend of future wireless system.According to duplex side
The difference of formula, LTE system can be divided into FDD-LTE (Frequency Division Duplexing) and TDD-LTE (Time
Division Duplexing) two kinds of technologies.
In LTE system, ascending control information is for carrying upstream control signaling, if measurement reports, scheduling request, and confirmation
Message etc. is mainly sent on PUCCH (Physical Uplink Control CHannel, Physical Uplink Control Channel), and
Upstream data information is then mainly at PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel)
On transmitted.For FDD-LTE system, when there are cutting between PUSCH channel and PUCCH channel in adjacent subframe for terminal
When changing, there may be larger differences for the resource size that terminal is assigned on two kinds of channels, so as to cause terminal in adjacent sub-frame
Transmission power there is larger fluctuation (maximum can reach 20dB or more).Due to larger, the terminal meeting of transmission power jump of terminal
Carry out the switch work of power amplifier gear selecting.Power amplifier gear selecting is the operation that a kind of pair of analog signal executes, and entry-into-force time point cannot be accurate
Control.In general, terminal, when channel switches, the power on previous subframe PUSCH channel is larger, and latter subframe PUCCH channel
On power it is small, when carrying out power amplifier gear selecting, the onset wave in order to guarantee next subframe is complete, can carry out the behaviour of gear selecting in advance
Make, causes the also not complete transmitting of the signal waveform on previous subframe PUSCH channel to be just interrupted, with low power transmissions.This just holds
There is decoding error, shadow in the last one orthogonal frequency division multiplex OFDM symbol of PUSCH channel signal before easily causing channel to switch
Ring ascending performance.Other than the switching of PUSCH channel and PUCCH channel, if shared by the adjacent traffic scheduling twice of the user
Band resource (PRB number) difference is larger, it is also possible to will appear the problem of previous subframe last OFDM symbol is truncated.
Likewise, in TDD-LTE system, if configuring multiple sub-frame of uplink, or there are conventional subframe SRS signal (Sounding
Reference Signal, Sounding Reference Signal) and SRS signal bandwidth when differing larger with service signal bandwidth, it can also
The problem of last OFDM symbol is truncated can be will appear, influence ascending performance.
In prior art, the processing mode to the above problem is that direct computation of DFT is being done to the uplink signal received in base station
Before leaf transformation, the cyclic prefix of each OFDM symbol in the signal can be removed, only retain effective data portion, but the method
Be equivalent to and introduce distortion in the processing inlet to signal, still can further influence subsequent signal processing (as demodulation,
Compiling etc.) process, and then influence ascending performance.
Summary of the invention
In view of the above problems, it proposes the embodiment of the present application and overcomes the above problem or at least partly in order to provide one kind
A kind of method of the signal processing to solve the above problems and a kind of corresponding device of signal processing.
To solve the above-mentioned problems, the embodiment of the present application discloses a kind of method of signal processing, comprising:
Receive the signal that terminal is sent by the Physical Uplink Shared Channel PUSCH of current subframe；
When the terminal is switched to by the Physical Uplink Shared Channel PUSCH of current subframe the physical uplink control of next subframe
When channel PUCCH processed, extract operation before being executed to the signal；
Discrete Fourier transform is carried out to the signal of extract operation before completing, obtains discrete Fourier transform result；
According to the discrete Fourier transform as a result, being compiled to the signal.
Optionally, the signal includes multiple orthogonal frequency division multiplex OFDM symbols, takes behaviour before the execution to the signal
As the step of include:
Determine the last one OFDM symbol of the signal；
Extract operation before being executed to the last one described OFDM symbol.
Optionally, the OFDM symbol is made of the cyclic prefix and valid data of certain length, described to described last
The step of extract operation, includes: before one OFDM symbol executes
Determine the first length and the second length, the length of first of length no more than cyclic prefix, described second
Length is identical as the length of the valid data；
According to first length, the initial position of the preceding extract operation is determined, wherein from the initial position to described
Length at the last one position of cyclic prefix is identical as first length；
Since the initial position, the data of second length are extracted from the last one described OFDM symbol.
Optionally, include: the step of the signal progress discrete Fourier transform of extract operation before described pair of completion
Discrete Fourier transform is carried out to the last one OFDM symbol described in extract operation before completing.
Optionally, described pair of the last one described OFDM symbol for completing preceding extract operation carries out the step of discrete Fourier transform
Suddenly include:
Determine that the compensation factor of the discrete Fourier transform, the compensation factor include that phase compensating factor and frequency deviation are mended
Repay the factor；
Using the phase compensating factor and frequency deviation compensation factor, the last one OFDM described in extract operation before completing is accorded with
Number carry out discrete Fourier transform.
Optionally, the phase compensating factor is determined by following formula:
The frequency deviation compensation factor is determined by following formula:
Wherein, cpshiftFor first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the sampling per second extracted from continuous signal and form discrete signal
Number.
Optionally, described to use the phase compensating factor and frequency deviation compensation factor, to before completing described in extract operation most
The latter OFDM symbol carry out discrete Fourier transform the step of include:
Frequency deviation compensation is carried out to the last one OFDM symbol described in extract operation before the completion, obtains the first transformation knot
Fruit；
Discrete Fourier transform is carried out to first transformation results, obtains the second transformation results；
Phase compensation is carried out to second transformation results, obtains the discrete Fourier transform result.
Optionally, discrete Fourier transform is carried out to first transformation results described, obtains the second transformation results
Before step, further includes:
Constellation demodulation point compensation is carried out to first transformation results.
Optionally, determine that demodulation constellation point compensates size by following formula:
To solve the above-mentioned problems, the embodiment of the present application also discloses a kind of device of signal processing, comprising:
Receiving module, the signal sent for receiving terminal by the Physical Uplink Shared Channel PUSCH of current subframe；
Preceding modulus block, for being switched to next son by the Physical Uplink Shared Channel PUSCH of current subframe in the terminal
When the Physical Uplink Control Channel PUCCH of frame, extract operation before being executed to the signal；
Conversion module obtains direct computation of DFT for carrying out discrete Fourier transform to the signal of extract operation before completing
Leaf transformation result；
Collector, for according to the discrete Fourier transform as a result, being compiled to the signal.
Optionally, the signal includes multiple orthogonal frequency division multiplex OFDM symbols, and the preceding modulus block includes:
Submodule is determined, for determining the last one OFDM symbol of the signal；
Before take submodule, for the last one described OFDM symbol execute before extract operation.
Optionally, the OFDM symbol is made of the cyclic prefix and valid data of certain length, takes submodule before described
Include:
Length determination unit, for determining the first length and the second length, before first of length no more than circulation
The length sewed, second length are identical as the length of the valid data；
Initial position determination unit, for determining the initial position of the preceding extract operation according to first length,
In, the length from from the initial position to the last one position of the cyclic prefix is identical as first length；
Extraction unit, for since the initial position, extracting described from the last one described OFDM symbol
The data of two length.
Optionally, the conversion module includes:
Transformation submodule, for carrying out discrete fourier change to the last one OFDM symbol described in extract operation before completing
It changes.
Optionally, the transformation submodule includes:
Compensation factor determination unit, for determining the compensation factor of the discrete Fourier transform, the compensation factor packet
Include phase compensating factor and frequency deviation compensation factor；
Converter unit, for using the phase compensating factor and frequency deviation compensation factor, to described in extract operation before completing
The last one OFDM symbol carries out discrete Fourier transform.
Optionally, the phase compensating factor is determined by following formula:
The frequency deviation compensation factor is determined by following formula:
Wherein, cpshiftFor first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the sampling per second extracted from continuous signal and form discrete signal
Number.
Optionally, the converter unit includes:
First transformation subelement, for carrying out frequency deviation benefit to the last one OFDM symbol described in extract operation before the completion
It repays, obtains the first transformation results；
Second transformation subelement obtains the second transformation for carrying out discrete Fourier transform to first transformation results
As a result；
Third converts subelement, for carrying out phase compensation to second transformation results, obtains the discrete fourier
Transformation results.
Optionally, described device further include:
4th transformation subelement, for before the first transformation subelement is executed to the completion described in extract operation most
The latter OFDM symbol carries out frequency deviation compensation, after obtaining the first transformation results, carries out constellation demodulation to first transformation results
Point compensation.
Optionally, determine that demodulation constellation point compensates size by following formula:
Compared with the background art, the embodiment of the present application includes the following advantages:
In the embodiment of the present application, behaviour is taken before executing by the signal to the Physical Uplink Shared Channel PUSCH received
Make, discrete Fourier transform then is carried out to the signal of extract operation before completing, the truncated generation of data is avoided, so that base
The data information of the signal integrity can be obtained by standing, and reduce Block Error Rate (the Block Error that terminal sends signal
Ratio), it ensure that the good receptivity of base station side, improve the efficiency of transmission of signal.
Secondly, the embodiment of the present application, which passes through, determines compensation factor, and carries out discrete fourier change using the compensation factor
Change, it is ensured that the accuracy of discrete Fourier transform result, further ensure base station the signal is compiled it is accurate
Property.
Detailed description of the invention
Fig. 1 is a kind of step flow chart of the embodiment of the method one of signal processing of the application；
Fig. 2 is a kind of step flow chart of the embodiment of the method two of signal processing of the application；
Fig. 3 is a kind of structural block diagram of the Installation practice of signal processing of the application.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing and it is specific real
Applying mode, the present application will be further described in detail.
Referring to Fig.1, a kind of step flow chart of the embodiment of the method one of signal processing of the application is shown, it specifically can be with
Include the following steps:
Step 101, the signal that terminal is sent by the Physical Uplink Shared Channel PUSCH of current subframe is received；
In general, terminal mainly passes through the physics of subframe when carrying the signal of upstream data information to base station transmission
For Uplink Shared Channel PUSCH come what is carried out, base station can make further place after receiving the signal to the signal
Reason.
Step 102, the object of next subframe is switched to by the Physical Uplink Shared Channel PUSCH of current subframe when the terminal
When managing uplink control channel PUCCH, extract operation before being executed to the signal；
In general, Physical Uplink Shared Channel PUSCH and Physical Uplink Control Channel PUCCH cannot carry out the biography of signal simultaneously
It is defeated, therefore, in order to avoid as power amplifier gear selecting operation caused by signal truncate problem, in the embodiment of the present application, when terminal by
When the PUSCH channel of current subframe is switched to the PUCCH channel of next subframe, extract operation before being executed to the signal.
Generally, the signal may include multiple orthogonal frequency division multiplex OFDM symbols, and the OFDM symbol is by a fixed length
The cyclic prefix and valid data of degree form.The preceding extract operation refer to extracted since a certain position of cyclic prefix it is described
The data information of signal.Since cyclic prefix is to move the data information of OFDM symbol tail portion to head to constitute, can recognize
To be a kind of redundancy, therefore, can be believed by obtaining the total data of the signal to the preceding extract operation of cyclic prefix
Breath is without losing.
In the embodiment of the present application, described the step of executing preceding extract operation to the signal, can specifically include following sub-step
It is rapid:
Sub-step 1021 determines the last one OFDM symbol of the signal；
Sub-step 1022, extract operation before being executed to the last one described OFDM symbol.
As data truncate be the last one OFDM symbol signal on Physical Uplink Shared Channel PUSCH caused by
It influences, therefore, in the embodiment of the present application, the last one OFDM symbol of the signal can be determined first, then to institute
Extract operation before the last one OFDM symbol executes is stated, to guarantee that base station can receive the complete number of a last OFDM symbol
It is believed that breath.
In a preferred embodiment of the present application, the son that preceding extract operation is executed to the last one described OFDM symbol
Step can specifically include:
10221, determine the first length and the second length；
10222, according to first length, determine the initial position of the preceding extract operation；
10223, since the initial position, second length is extracted from the last one described OFDM symbol
Data.
In the embodiment of the present application, first length is the length of extract operation before needing to be implemented.In general, being truncated in data
Of length no more than cyclic prefix length in the case where, so that it may by obtaining the OFDM and according with to being fetched before cyclic prefix
Number total data information, therefore, the length of the cyclic prefix is not to be exceeded in first length.Those skilled in the art can
With the specific value of first length determine according to actual needs.
It, can be according to the numerical value of the first length before the circulation of the last one OFDM symbol after determining the first length
The initial position of extract operation before being determined in sewing, wherein from the initial position to the last one position of the cyclic prefix
The length at place is identical as first length.For example, being determined if the cyclic prefix of the last one OFDM symbol is 144
First length is 96, then can determine that the initial position of current preceding extract operation is the 49th position (144-96+1) of cyclic prefix.
It is then possible to which the initial position starts, second length is extracted from the last one described OFDM symbol
Data.In the embodiment of the present application, the length phase of second length and the valid data of the last one OFDM symbol
Together.
For example, corresponding second length is also answered if the valid data length of the last one OFDM symbol is 2048
It is 2048, in the examples described above, the number that length is 2048 can be extracted backward since at the 49th position of cyclic prefix
According to the last one OFDM symbol of extract operation before as completing.
Step 103, discrete Fourier transform is carried out to the signal of extract operation before completing, obtains discrete Fourier transform
As a result；
In the concrete realization, carrying out discrete Fourier transform to the signal of extract operation before completing can be by using Fu
Family name converts accelerator to realize.
In the embodiment of the present application, the step of described pair of signal for completing preceding extract operation carries out discrete Fourier transform
It can specifically include following sub-step:
Sub-step 1031 carries out discrete Fourier transform to the last one OFDM symbol described in extract operation before completing.
In the concrete realization, described pair of the last one described OFDM symbol for completing preceding extract operation carries out discrete fourier change
The sub-step changed may further include:
10311, determine the compensation factor of the discrete Fourier transform；
10312, using the phase compensating factor and frequency deviation compensation factor, to described in extract operation before completing the last one
OFDM symbol carries out discrete Fourier transform.
In general, terminal, in order to avoid generating DC component, is generally all needed when sending signal in actual LTE system
Certain frequency offset processing is carried out to the signal, therefore, base station needs to carry out above-mentioned frequency deviation after receiving the signal
Compensation.In addition, the phase offset in transmission process also will affect the result of discrete Fourier transform, it is also desirable to inclined to above-mentioned phase
Shifting compensates.
Therefore, in the embodiment of the present application, the compensation factor of the discrete Fourier transform can be determined first, it is described
Compensation factor may include phase compensating factor and frequency deviation compensation factor, then be compensated using the phase compensating factor and frequency deviation
The factor carries out discrete Fourier transform to the last one OFDM symbol described in extract operation before completing.
In the concrete realization, the phase compensating factor can be determined by following formula:
And the frequency deviation compensation factor can be determined by following formula:
Wherein, cpshiftFor first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the sampling per second extracted from continuous signal and form discrete signal
Number.
After determining phase compensating factor and frequency deviation compensation factor, can to before completing described in extract operation the last one
OFDM symbol carries out discrete Fourier transform, obtains discrete Fourier transform as a result, actual treatment process can be with following public
Formula indicates:
Wherein, DFT is discrete Fourier transform expression formula.
It should be noted that in concrete operations, due toWithVector, be applied to respectively each from
Fourier transformation result and each time domain discrete sampled point are dissipated, forWithCompensation should be respectively in discrete Fu
In carried out after leaf transformation and before transformation, that is, correspond to discrete Fourier transform realize in after multiply and before multiply.
Step 104, according to the discrete Fourier transform as a result, being compiled to the signal.
In the embodiment of the present application, after completing the discrete Fourier transform to the signal, it is ensured that base station can
Complete PUSCH channel signal is obtained, so as to carry out further process of compilation to the signal.
In the embodiment of the present application, behaviour is taken before executing by the signal to the Physical Uplink Shared Channel PUSCH received
Make, discrete Fourier transform then is carried out to the signal of extract operation before completing, the truncated generation of data is avoided, so that base
The data information of the signal integrity can be obtained by standing, and reduce Block Error Rate (the Block Error that terminal sends signal
Ratio), it ensure that the good receptivity of base station side, improve the efficiency of transmission of signal.
Secondly, the embodiment of the present application, which passes through, determines compensation factor, and carries out discrete fourier change using the compensation factor
Change, it is ensured that the accuracy of discrete Fourier transform result, further ensure base station the signal is compiled it is accurate
Property.
Referring to Fig. 2, a kind of step flow chart of the embodiment of the method two of signal processing of the application is shown, it specifically can be with
Include the following steps:
Step 201, the signal that terminal is sent by the Physical Uplink Shared Channel PUSCH of current subframe is received；
Step 202, the object of next subframe is switched to by the Physical Uplink Shared Channel PUSCH of current subframe when the terminal
When managing uplink control channel PUCCH, the last one OFDM symbol of the signal is determined；
In the concrete realization, when terminal is switched to next subframe by the Physical Uplink Shared Channel PUSCH of current subframe
When Physical Uplink Control Channel PUCCH, base station physical layer can perceive the switching of channel by the scheduling of MAC, and identify
The last one OFDM symbol of the signal.
Step 203, the first length and the second length are determined；
In the embodiment of the present application, first length is the length of extract operation before needing to be implemented.In general, being truncated in data
Of length no more than cyclic prefix length in the case where, so that it may by obtaining the OFDM and according with to being fetched before cyclic prefix
Number total data information, therefore, the length of the cyclic prefix, second length and institute is not to be exceeded in first length
The length for stating the valid data of the last one OFDM symbol is identical.
Step 204, according to first length, the initial position of the preceding extract operation is determined；
It in the concrete realization, can be according to the numerical value of the first length at the last one after determining the first length
The initial position of extract operation before being determined in the cyclic prefix of OFDM symbol, wherein before from the initial position to the circulation
The length at the last one position sewed is identical as first length.For example, if the circulation of the last one OFDM symbol
Prefix is 144, and the first length determined is 96, then can determine it is current before the initial position of extract operation be the of cyclic prefix
49 positions (144-96+1).
Step 205, since the initial position, second length is extracted from the last one described OFDM symbol
Data；
For example, corresponding second length is also answered if the valid data length of the last one OFDM symbol is 2048
It is 2048, in the examples described above, the number that length is 2048 can be extracted backward since at the 49th position of cyclic prefix
According to the last one OFDM symbol of extract operation before as completing.
Step 206, the compensation factor of the discrete Fourier transform is determined；
In the embodiment of the present application, the compensation factor may include phase compensating factor and frequency deviation compensation factor.It is described
Phase compensating factor is the compensation that the phase offset to the signal in transmission process carries out, and the frequency deviation compensation factor is pair
The compensation for certain frequency offset processing that terminal is carried out when sending signal in order to avoid generating DC component, it is generally, described
The size of the value of frequency offset processing is 7.5KHz.
In the concrete realization, the phase compensating factor can be determined by following formula:
And the frequency deviation compensation factor can be determined by following formula:
Wherein, cpshiftFor first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the sampling per second extracted from continuous signal and form discrete signal
Number.
Step 207, using the phase compensating factor and frequency deviation compensation factor, to described in extract operation before completing last
A OFDM symbol carries out discrete Fourier transform；
It is described using the phase compensating factor and frequency deviation compensation factor in a preferred embodiment of the present application, it is right
The step of the last one described OFDM symbol progress discrete Fourier transform of extract operation before completing, can specifically include following son
Step:
Sub-step 2071 carries out frequency deviation compensation to the last one OFDM symbol described in extract operation before the completion, obtains
First transformation results；
Sub-step 2072 carries out discrete Fourier transform to first transformation results, obtains the second transformation results；
Sub-step 2073 carries out phase compensation to second transformation results, obtains the discrete Fourier transform result.
In the concrete realization, if note received signal is x (n), the length that the first length takes before being is cpshift, then complete
The signal of preceding extract operation can be denoted as:
X'(m)=x (n-cpshift)N
It is then possible to carry out direct computation of DFT to the last one OFDM symbol described in extract operation before completing by following formula
Leaf transformation obtains discrete Fourier transform result:
Wherein, DFT [] is discrete Fourier transform expression formula.
It should be noted that in concrete operations, due toWithIt is vector, it is discrete is applied to each respectively
Fourier transformation result and each time domain discrete sampled point, forWithCompensation should be respectively in direct computation of DFT
With progress before transformation after leaf transformation, that is, multiplies after corresponding in discrete Fourier transform realization and before multiply.
In a preferred embodiment of the present application, discrete fourier change is carried out to first transformation results described
Before the step of changing, obtaining the second transformation results, can also include:
Constellation demodulation point compensation is carried out to first transformation results.
The applicant in practice, it has been found that according to the method described above carry out discrete Fourier transform after, it is described the last one
The demodulation constellation point of OFDM symbol has a fixed skew, therefore, more acurrate in order to make to demodulate constellation point, in the application reality
It applies in example, can also first transformation results be carried out with constellation demodulation point compensation.
It in the concrete realization, can be by determining that demodulation constellation point compensates size by following formula:
In concrete operations, due toIt is a scalar (or coefficient can be referred to as), it is contemplated that discrete fourier becomes
The linear characteristic changed, it can both be compensated in transformation precompensation or after the conversion, it can willResult and completion
The result of the signal of preceding extract operation is multiplied, and then carries out discrete fourier variation, can also be to extract operation before completing
It, will after the signal carries out discrete Fourier transformResult be multiplied with the result of discrete Fourier transform.
In a kind of example of the application, the compensation of demodulation constellation point can be carried out before Fourier transformation, that is, right first
The time-domain signal taken before menstruation does frequency deviation compensation (going 7.5kHZ frequency deviation) and demodulation constellation point compensation, corresponding with " preceding to multiply ", indicates
Operation is the processing carried out in time domain, then carries out discrete Fourier transform before discrete Fourier transform, obtains second and becomes
Change as a result, then to the second transformation results carry out phase compensation, it is corresponding with " multiplying afterwards ", i.e., after discrete Fourier transform, be
In the processing that frequency domain carries out, discrete Fourier transform result is finally obtained.
Therefore, actual treatment process can be indicated with following formula:
Wherein, DFT [] is discrete Fourier transform expression formula.
Step 208, the signal is compiled.
In the embodiment of the present application, when terminal is when carrying out channel switching, by the PUSCH channel signal received
The last one OFDM symbol execute before extract operation, frequency deviation compensation and solution then are carried out to the last one described OFDM symbol
Constellation point compensation is adjusted, the first transformation results is obtained, and discrete Fourier transform is carried out to the first transformation results, then transformation is tied
Fruit carries out phase compensation, enables base station completely to obtain the data information of the last one OFDM symbol, avoids number
According to truncated generation, the Block Error Rate (Block Error Ratio) that terminal sends signal is reduced, ensure that base station side is good
Receptivity improves the efficiency of transmission of signal.
It should be noted that for simple description, therefore, it is stated as a series of action groups for embodiment of the method
It closes, but those skilled in the art should understand that, the embodiment of the present application is not limited by the described action sequence, because according to
According to the embodiment of the present application, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art also should
Know, the embodiments described in the specification are all preferred embodiments, and related movement not necessarily the application is implemented
Necessary to example.
Referring to Fig. 3, a kind of structural block diagram of the Installation practice of signal processing of the application is shown, can specifically include
Following module:
Receiving module 301, the letter sent for receiving terminal by the Physical Uplink Shared Channel PUSCH of current subframe
Number；
Preceding modulus block 302, in the case where the terminal is switched to by the Physical Uplink Shared Channel PUSCH of current subframe
When the Physical Uplink Control Channel PUCCH of one subframe, extract operation before being executed to the signal；
Conversion module 303 obtains discrete Fu for carrying out discrete Fourier transform to the signal of extract operation before completing
In leaf transformation result；
Collector 304, for according to the discrete Fourier transform as a result, being compiled to the signal.
In the embodiment of the present application, the signal includes multiple orthogonal frequency division multiplex OFDM symbols, the preceding modulus block 302
It can specifically include following submodule:
Submodule is determined, for determining the last one OFDM symbol of the signal；
Before take submodule, for the last one described OFDM symbol execute before extract operation.
In the embodiment of the present application, the OFDM symbol is made of the cyclic prefix and valid data of certain length, described
Before take submodule to can specifically include such as lower unit:
Length determination unit, for determining the first length and the second length, before first of length no more than circulation
The length sewed, second length are identical as the length of the valid data；
Initial position determination unit, for determining the initial position of the preceding extract operation according to first length,
In, the length from from the initial position to the last one position of the cyclic prefix is identical as first length；
Extraction unit, for since the initial position, extracting described from the last one described OFDM symbol
The data of two length.
In the embodiment of the present application, the conversion module 303 can specifically include following submodule:
Transformation submodule, for carrying out discrete fourier change to the last one OFDM symbol described in extract operation before completing
It changes.
In the embodiment of the present application, the transformation submodule can specifically include such as lower unit:
Compensation factor determination unit, for determining the compensation factor of the discrete Fourier transform, the compensation factor packet
Include phase compensating factor and frequency deviation compensation factor；
Converter unit, for using the phase compensating factor and frequency deviation compensation factor, to described in extract operation before completing
The last one OFDM symbol carries out discrete Fourier transform.
In the embodiment of the present application, the phase compensating factor can be determined by following formula:
And the frequency deviation compensation factor can be determined by following formula:
Wherein, cpshiftFor first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the sampling per second extracted from continuous signal and form discrete signal
Number.
In the embodiment of the present application, the converter unit can specifically include following subelement:
First transformation subelement, for carrying out frequency deviation benefit to the last one OFDM symbol described in extract operation before the completion
It repays, obtains the first transformation results；
Second transformation subelement obtains the second transformation for carrying out discrete Fourier transform to first transformation results
As a result；
Third converts subelement, for carrying out phase compensation to second transformation results, obtains the discrete fourier
Transformation results.
In a preferred embodiment of the present application, the converter unit can also include following subelement:
4th transformation subelement, for before the first transformation subelement is executed to the completion described in extract operation most
The latter OFDM symbol carries out frequency deviation compensation, after obtaining the first transformation results, carries out constellation demodulation to first transformation results
Point compensation.
In the embodiment of the present application, it can determine that demodulation constellation point compensates size by following formula:
For device embodiment, since it is basically similar to the method embodiment, related so being described relatively simple
Place illustrates referring to the part of embodiment of the method.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
It should be understood by those skilled in the art that, the embodiments of the present application may be provided as method, apparatus or calculating
Machine program product.Therefore, the embodiment of the present application can be used complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present application can be used one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present application is referring to according to the method for the embodiment of the present application, terminal device (system) and computer program
The flowchart and/or the block diagram of product describes.It should be understood that flowchart and/or the block diagram can be realized by computer program instructions
In each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these
Computer program instructions are set to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine, so that being held by the processor of computer or other programmable data processing terminal devices
Capable instruction generates for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of specified function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing terminal devices
In computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one side of one or more flows of the flowchart and/or block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing terminal devices, so that
Series of operation steps are executed on computer or other programmable terminal equipments to generate computer implemented processing, thus
The instruction executed on computer or other programmable terminal equipments is provided for realizing in one or more flows of the flowchart
And/or in one or more blocks of the block diagram specify function the step of.
Although preferred embodiments of the embodiments of the present application have been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and all change and modification within the scope of the embodiments of the present application.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Method to a kind of signal processing provided herein and a kind of device of signal processing above have carried out in detail
It introduces, specific examples are used herein to illustrate the principle and implementation manner of the present application, the explanation of above embodiments
It is merely used to help understand the present processes and its core concept；At the same time, for those skilled in the art, according to this
The thought of application, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not answered
It is interpreted as the limitation to the application.
Claims (14)
1. a kind of method of signal processing characterized by comprising
Receive the signal that terminal is sent by the Physical Uplink Shared Channel PUSCH of current subframe；
When the terminal is believed by the physical uplink control that the Physical Uplink Shared Channel PUSCH of current subframe is switched to next subframe
When road PUCCH, extract operation before being executed to the signal；
Discrete Fourier transform is carried out to the signal of extract operation before completing, obtains discrete Fourier transform result；
According to the discrete Fourier transform as a result, being compiled to the signal；
Wherein, described the step of executing preceding extract operation to the signal, includes:
Determine the last one OFDM symbol of the signal；
Extract operation before being executed to the last one described OFDM symbol；
The OFDM symbol is made of the cyclic prefix and valid data of certain length, described to the last one described OFDM symbol
The step of extract operation, includes: before executing
Determine the first length and the second length, the length of first of length no more than cyclic prefix, second length
It is identical as the length of the valid data；
According to first length, the initial position of the preceding extract operation is determined, wherein from the initial position to the circulation
Length at the last one position of prefix is identical as first length；
Since the initial position, the data of second length are extracted from the last one described OFDM symbol.
2. the method according to claim 1, wherein the described pair of signal progress for completing preceding extract operation is discrete
The step of Fourier transformation includes:
Discrete Fourier transform is carried out to the last one OFDM symbol described in extract operation before completing.
3. according to the method described in claim 2, it is characterized in that, the last one described OFDM of the preceding extract operation of described pair of completion
Symbol carry out discrete Fourier transform the step of include:
Determine the compensation factor of the discrete Fourier transform, the compensation factor include phase compensating factor and frequency deviation compensation because
Son；
Using the phase compensating factor and frequency deviation compensation factor, to the last one OFDM symbol described in extract operation before completing into
Row discrete Fourier transform.
4. according to the method described in claim 3, it is characterized in that, determining the phase compensating factor by following formula:
The frequency deviation compensation factor is determined by following formula:
Wherein, cpshiftFor the first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
N is 0 natural number for arriving N-1；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the number of samples per second extracted from continuous signal and form discrete signal.
5. the method according to claim 3 or 4, which is characterized in that described to be mended using the phase compensating factor and frequency deviation
The factor is repaid, includes: to the step of the last one OFDM symbol described in preceding extract operation carries out discrete Fourier transform is completed
Frequency deviation compensation is carried out to the last one OFDM symbol described in extract operation before the completion, obtains the first transformation results；
Discrete Fourier transform is carried out to first transformation results, obtains the second transformation results；
Phase compensation is carried out to second transformation results, obtains the discrete Fourier transform result.
6. according to the method described in claim 5, it is characterized in that, carrying out direct computation of DFT to first transformation results described
Before the step of leaf transformation, the second transformation results of acquisition, further includes:
Constellation demodulation point compensation is carried out to first transformation results.
7. according to the method described in claim 6, it is characterized in that, determining that demodulation constellation point compensates size by following formula:
Wherein, cpshirtFor the first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
N is 0 natural number for arriving N-1；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate be it is per second extracted from continuous signal and form from
The number of samples of scattered signal.
8. a kind of device of signal processing characterized by comprising
Receiving module, the signal sent for receiving terminal by the Physical Uplink Shared Channel PUSCH of current subframe；
Preceding modulus block, for being switched to next subframe by the Physical Uplink Shared Channel PUSCH of current subframe in the terminal
When Physical Uplink Control Channel PUCCH, extract operation before being executed to the signal；
Conversion module obtains discrete fourier change for carrying out discrete Fourier transform to the signal of extract operation before completing
Change result；
Collector, for according to the discrete Fourier transform as a result, being compiled to the signal
Wherein, the signal includes multiple orthogonal frequency division multiplex OFDM symbols, and the preceding modulus block includes:
Submodule is determined, for determining the last one OFDM symbol of the signal；
Before take submodule, for the last one described OFDM symbol execute before extract operation
The OFDM symbol is made of the cyclic prefix and valid data of certain length, takes the submodule to include: before described
Length determination unit, for determining the first length and the second length, first of length no more than cyclic prefix
Length, second length are identical as the length of the valid data；
Initial position determination unit, for determining the initial position of the preceding extract operation according to first length, wherein from
Length at the initial position to the last one position of the cyclic prefix is identical as first length；
Extraction unit, it is long for since the initial position, extracting described second from the last one described OFDM symbol
The data of degree.
9. device according to claim 8, which is characterized in that the conversion module includes:
Transformation submodule, for carrying out discrete Fourier transform to the last one OFDM symbol described in extract operation before completing.
10. device according to claim 9, which is characterized in that the transformation submodule includes:
Compensation factor determination unit, for determining that the compensation factor of the discrete Fourier transform, the compensation factor include phase
Position compensation factor and frequency deviation compensation factor；
Converter unit, for using the phase compensating factor and frequency deviation compensation factor, to the described last of the preceding extract operation of completion
One OFDM symbol carries out discrete Fourier transform.
11. device according to claim 10, which is characterized in that determine the phase compensating factor by following formula:
The frequency deviation compensation factor is determined by following formula:
Wherein, cpshiftFor the first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
N is 0 natural number for arriving N-1；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate is the number of samples per second extracted from continuous signal and form discrete signal.
12. device according to claim 11, which is characterized in that the converter unit includes:
First transformation subelement, for carrying out frequency deviation compensation to the last one OFDM symbol described in extract operation before the completion,
Obtain the first transformation results；
Second transformation subelement obtains the second transformation results for carrying out discrete Fourier transform to first transformation results；
Third converts subelement, for carrying out phase compensation to second transformation results, obtains the discrete Fourier transform
As a result.
13. device according to claim 12, which is characterized in that further include:
4th transformation subelement, for before the first transformation subelement is executed to the completion described in extract operation last
A OFDM symbol carries out frequency deviation compensation, after obtaining the first transformation results, carries out constellation demodulation point to first transformation results and mends
It repays.
14. device according to claim 13, which is characterized in that determine that demodulation constellation point compensation is big by following formula
It is small:
Wherein, cpshirtFor the first length；
J is empty unit symbol；
N is that the operation of discrete Fourier transform is counted；
N is 0 natural number for arriving N-1；
feIt is the size for the value for avoiding DC component and carrying out frequency offset processing for the terminal；
TsFor the inverse of sample rate, the sample rate be it is per second extracted from continuous signal and form from
The number of samples of scattered signal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119349A (en) * | 2006-08-01 | 2008-02-06 | 北京大学 | Improved OFDM signal modulating, demodulating method |
| CN101420265A (en) * | 2007-10-26 | 2009-04-29 | 鼎桥通信技术有限公司 | Data transmission method, system and device in long term evolution system |
| CN101729217A (en) * | 2008-10-31 | 2010-06-09 | 华为技术有限公司 | Method, device and system for transmission |
| CN102571668A (en) * | 2012-01-06 | 2012-07-11 | 合肥东芯通信股份有限公司 | Phase compensation method and system in LTE (long term evolution) system |
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| JP5383819B2 (en) * | 2008-12-05 | 2014-01-08 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Method and apparatus in communication network system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101119349A (en) * | 2006-08-01 | 2008-02-06 | 北京大学 | Improved OFDM signal modulating, demodulating method |
| CN101420265A (en) * | 2007-10-26 | 2009-04-29 | 鼎桥通信技术有限公司 | Data transmission method, system and device in long term evolution system |
| CN101729217A (en) * | 2008-10-31 | 2010-06-09 | 华为技术有限公司 | Method, device and system for transmission |
| CN102571668A (en) * | 2012-01-06 | 2012-07-11 | 合肥东芯通信股份有限公司 | Phase compensation method and system in LTE (long term evolution) system |
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