WO2017152344A1 - Method for processing sent data, and transmitter - Google Patents

Abstract

Disclosed in the present invention are a method for processing sent data, and a transmitter. The method comprises: obtaining a modulation signal in each of M subbands according to sent data of the M subbands in a working frequency band of a transmittter, M being a positive integer greater than 1; separately performing first IDFT on the modulation signal of each subband among the M subbands; performing second IDFT on a signal, on which the first IDFT has been performed, of the M subbands; weighting, according to a filter coefficient sequence, a sequence obtained by performing the second IDFT; and performing shifting accumulation on the weighted sequence, so as to obtain a sent signal. The method for processing sent data and the transmitter in embodiments of the present invention can decrease the complexity of filtering.

Description

Method and transmitter for processing transmitted data Technical field

The present invention relates to the field of communications and, more particularly, to a method and transmitter for processing transmitted data.

Background technique

Long Term Evolution (LTE) is a long-term evolution of the Universal Mobile Telecommunications System (UMTS) technology standard developed by The 3rd Generation Partnership Project (3GPP). The month was formally established and launched at the 3GPP Toronto TSG RAN#26 conference. The LTE system introduces key transmission technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and Multi-Input & Multi-Output (MIMO), which significantly increases spectrum efficiency and data transmission rate, and supports multiple Bandwidth allocation: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, etc., and support the global mainstream 2G/3G frequency band and some new frequency bands, so the spectrum allocation is more flexible, system capacity and coverage are also significantly improved. The network architecture of the LTE system is flatter and simplistic, which reduces the complexity of network nodes and systems, thereby reducing system delay and reducing network deployment and maintenance costs. The LTE system supports interoperability with other 3GPP systems.

The physical layer of the LTE system uses OFDM technology to modulate data onto a plurality of mutually orthogonal subcarriers, and eliminates Inter-symbol Interference (ISI) by adding a Cyclic Prefix (CP). For quadrature signals, there is no interference between subcarriers; but for non-orthogonal out-of-band signals, the frequency domain sideband has a high amplitude, slow attenuation, and its out-of-band interference (OOB) is large. This requires more virtual carriers to be reserved when deploying LTE to avoid interference to the out-of-band system, that is, a frequency protection interval is required between the two frequency bands.

In future technological evolution, it is desirable to perform flexible frequency division multiplexing on a carrier. That is, a relatively free resource configuration (eg, band division at a granularity of 1 RB, 0.5 MHz, 1 Mhz, etc.) can be performed in one carrier (cell); signals having different characteristics are transmitted on different sub-bands: for example, unicast service ( With a small delay, using a short CP), multicast services (with a large delay, using a long CP), it may also carry signals generated by the Universal Mobile Telecommunication System (UMTS) system (not Use CP), and not It is also possible to introduce a signal or the like having a structure different from the existing LTE frame. This makes the existing carrier aggregation technology unable to meet the demand and needs to be further enhanced. Filter-Orthogonal Frequency Division Multiplexing (Filtered-OFDM) technology can be seen as an enhancement of carrier aggregation technology. A frequency band is divided into multiple sub-bands, and different sub-bands can perform signal modulation using different wireless communication systems, such as OFDM, GSM, UMTS, and the like. After the baseband signals are formed in the respective subbands, the filter frequency separation is performed separately. Taking OFDM modulation as an example, each sub-band performs OFDM signal modulation and then filters each, and then superimposes the composite signal to send to the intermediate RF processing. When the sub-band granularity is thinned, the number of sub-bands on one carrier becomes larger, and the existing carrier aggregation technology is directly used, which involves processing of a plurality of medium-frequency radio modules, which requires a large cost in implementation. Therefore, the filtering operation can be placed in the baseband processing.

However, each sub-band is separately filtered, the RF processing complexity is high, and the cost is high; when it is placed in the baseband processing, although the complexity has been reduced, the complexity is still high for the baseband processing capability, compared to the same subcarrier. For a number of OFDM operations, the amount of computation may need to increase by hundreds of times.

Summary of the invention

Embodiments of the present invention provide a method and a transmitter for processing transmission data, which can reduce the complexity of filtering.

In a first aspect, a method of processing transmitted data is provided, comprising:

Obtaining, according to the transmission data of the M subbands in the working frequency band of the transmitter, a modulation signal of each of the M subbands, where M is a positive integer greater than one;

Performing a first discrete inverse Fourier transform IDFT on the modulated signals of each of the M subbands;

Performing a second IDFT on the signal after the first IDFT of the M subbands;

Weighting the sequence obtained by the second IDFT according to the filter coefficient sequence;

The weighted sequence is subjected to shift accumulation to obtain a transmission signal.

The method for processing transmission data according to the embodiment of the present invention performs a first IDFT on a modulated signal of each of the M subbands, a second IDFT on a signal after the first IDFT of the M subbands, and then performs a second IDFT according to the filter coefficient. The sequence weights the sequence obtained by the second IDFT, which can convert the multiplexed filter into a single-path filtering, which reduces the computational complexity and can reduce the complexity of the filtering.

In some possible implementations, the modulated signals of each subband in the M subband are obtained according to the transmit data of the M subbands in the working frequency band of the transmitter, including:

Transmitting and modulating the transmission data of each of the M subbands separately to obtain the M The modulated signal of each subband in each subband.

In some possible implementation manners, each sub-band carries an LTE unicast service signal, an LTE multicast service signal, a UMTS signal, and a GSM signal, respectively.

Embodiments of the present invention allow a system to divide subbands at any granularity, and any frame structure feature signals can be transmitted within the subbands.

In some possible implementations, the phase modulated and/or cyclic shifts may also be separately performed on each of the sub-band modulated signals.

In some possible implementations, the first discrete Fourier transform (IDFT) IDFT is performed on the modulated signals of each of the M subbands, respectively:

Performing a first IDFT on the modulated signal of the mth subband of the M subbands according to the following equation,

among them,

a signal obtained by phase-deflecting and/or cyclically shifting the modulated signal of the m-th sub-band or a signal of the m-th sub-band, NK indicating the order of the first IDFT, K being greater than or equal to L, and A power of 2 closest to L, L represents the sequence length of the modulation signal of each of the M subbands, and N is a positive integer.

In some possible implementations, the add CP operation can also be performed.

In some possible implementation manners, performing a second IDFT on the signal after the first IDFT of the M subbands includes:

Performing a second IDFT on the signal after the first IDFT of the M subbands according to the following equation,

Where Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m ,x _m represents the first IDFT of the mth subband of the M subbands The latter signal, U _cp,m represents the cyclic prefix CP length at the QT _s granularity, Q represents the upsampling rate, L _f represents the length of the filter coefficient sequence, K _max =f _s /Δf, f _s represents the transmitter The bandwidth of the working frequency band, Δf represents the subcarrier frequency interval, and L represents the number of subcarriers in each of the M subbands,

Indicates rounding up.

In some possible implementations, the second IDFT transform may be referred to as a class IDFT transform.

In some possible implementations, the second IDFT may be performed on the signal after the first IDFT of the M subbands according to the following equation.

In this case, the second IDFT is simplified to the M-order IDFT.

This embodiment limits the air sampling rate and can be further simplified.

In some possible implementations, the sequence obtained by the second IDFT is weighted according to a series of filter coefficients, including:

The sequence obtained by the second IDFT is multiplied by the sequence of filter coefficients.

In some possible implementations, the sequence obtained by the second IDFT is weighted according to a series of filter coefficients, including:

The sequence obtained by the second IDFT is cyclically shifted and repeatedly spread and multiplied by the sequence of filter coefficients.

In some possible implementations, the weighted sequence is subjected to shift accumulation to obtain a transmission signal, including:

Shifting the weighted sequence according to the following equation,

Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

among them,

Indicates the weighted sequence, B(k) represents the sequence after the shift accumulation, B'(k) represents the sequence after shifting the output signal, Q represents the upsampling rate, and _Lf represents the sequence of filter coefficients. length,

Indicates rounding up.

For example, for cache B, the initial elements in B are all 0, and the weighted sequence will be

Accumulate with the sequence in B, output the first Q elements in B, and then shift the sequence in B to zero for the next accumulation.

In some possible implementations, the transmit signal can be,

s(n)=s(aNQ+bQ+k)=B(k), 0≤k<Q.

In some possible implementations, the signal may be further subjected to frequency relocation.

In some possible implementations, the phase deflection operation before the first IDFT can be moved to the first IDFT operation, and the signal outputted by the first IDFT is multiplied by the same phase deflection value; the cyclic shift operation before the first IDFT is also There may be an alternative operation, such as frequency relocation of the signal output by the first IDFT after the first IDFT operation, and the above two pre-processing may be combined.

In the embodiment of the present invention, the OFDM operation is performed on each sub-band, and the relationship between the up-sampling rate and the number of sub-bands of the sub-band signal is not limited, and thus is more universal and has a wider application range.

In a second aspect, there is provided a transmitter comprising means for performing the method of the first aspect or any of the possible implementations of the first aspect.

In a third aspect, a transmitter is provided. The transmitter includes a processor, a memory, and a communication interface. The processor is coupled to the memory and communication interface. The memory is for storing instructions for the processor to execute, and the communication interface is for communicating with other network elements under the control of the processor. When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any of the possible implementations of the first aspect.

In a fourth aspect, a computer readable medium is provided for storing a computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention.

FIG. 2 is a schematic flowchart of a method for processing transmission data according to an embodiment of the present invention.

3 is a schematic diagram of a method of processing transmitted data in accordance with an embodiment of the present invention.

4 is another schematic diagram of a method of processing transmitted data in accordance with an embodiment of the present invention.

FIG. 5 is a schematic diagram of a method of processing transmission data according to another embodiment of the present invention.

FIG. 6 is another schematic diagram of a method of processing transmission data according to another embodiment of the present invention.

Figure 7 is a schematic block diagram of a transmitter in accordance with an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a transmitter according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solution of the embodiments of the present invention can be applied to various communication systems and systems for joint networking of various communication systems, for example, Global System of Mobile communication (GSM) system, code division multiple access (Code) Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE frequency division duplex ( Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, A 5G communication system or a system in which the above communication system is jointly networked.

It should be understood that, in the embodiment of the present invention, a user equipment (User Equipment, UE) may be referred to as a terminal (Mobile), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc., and the user equipment may be A Radio Access Network (RAN) communicates with one or more core networks. For example, the user equipment may be a mobile phone (or "cell phone"), a computer with a mobile terminal, etc., for example, a user equipment. It can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.

In the embodiment of the present invention, the base station may be a base station (Base Transceiver Station, BTS) in GSM or CDMA, or may be a base station (NodeB, NB) in WCDMA, or may be an evolved base station in LTE (Evolutional Node B). The ENB or e-NodeB) may also be a base station or a network device in a 5G communication system, and the present invention is not limited thereto. For convenience of description, the following embodiments will be described by taking an LTE system, a base station, and a user equipment UE as an example.

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention. In FIG. 1, base station 101 and UE, such as UE 111, UE 112, and UE 113, may transmit data over multiple subbands in the operating band, ie, multiple frame structure feature signals may be frequency division multiplexed in one frequency band. Each sub-band carries signals of the same transmission characteristic, and the transmission characteristics of signals carried on different sub-bands may be the same or different. For example, LTE unicast service signals, LTE multicast service signals, UMTS signals, and GSM signals may be respectively carried on different sub-bands.

2 shows a schematic flow diagram of a method 200 of processing transmitted data in accordance with an embodiment of the present invention. The method 200 can be performed by a transmitter.

S210. Acquire, according to the transmission data of the M subbands in the working frequency band of the transmitter, a modulation signal of each of the M subbands, where M is a positive integer greater than 1.

Specifically, the transmitter divides all or part of the frequency band (such as 20 MHz, one cell) of its working frequency band into multiple (M) sub-bands (referred to as "sub-bands"), for example, four sub-bands, each The subbands can carry different frame structure feature signals, and the subband bandwidths can be the same (eg, 5 MHz).

For example, as shown in FIG. 3, the working frequency band of the transmitter is divided into M sub-bands, which respectively carry LTE unicast service signals, LTE multicast service signals, UMTS signals and GSM signals.

Therefore, the embodiments of the present invention allow the system to divide the sub-bands at any granularity, and any frame structure feature signals can be transmitted within the sub-bands.

Each sub-band can select a sub-carrier bandwidth of a suitable granularity, such as 7.5 KHz, 15 KHz, 180 KHz, and the like.

Optionally, the transmitter may separately perform code modulation processing on the transmission data of each of the M subbands to obtain a modulated signal of each of the M subbands.

For example, for each subband, code modulation processing is performed independently, such as Turbo coding of LTE signals, Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM). Convolutional code encoding or the like is performed on the UMTS signal to obtain a modulated signal.

Alternatively, the phase-modulated and/or cyclic shifts may be separately performed on each of the sub-band modulated signals. Phase deflection, cyclic shift (frequency offset), can be called preprocessing. For example, for existing LTE receivers, phase deflection or cyclic shift is required; if a new receiver is available, it may not.

For example, defining a time series,

Indicates the length of time of the CP portion of the current symbol (the signal corresponding to time t _n-1 ≤ t < t _n) on the mth subband.

"Phase deflection" is:

L represents the number of subcarriers in each subband, and θ _{m, n-1} is related to the subband number in which it is located and the time sequence number of the current subcarrier symbol. such as:

Where: f _mL = f ₀ +mL·Δf, α represents the number of subcarriers in the interval from the center frequency of the subband to the starting frequency. E.g,

"Cycle shift" is: will

After zero-padding to the NK position, cyclically shift the alpha numbers according to the direction of decreasing the number.

K is a power of 2 greater than or equal to L and closest to L, and N is a positive integer.

E.g,

then

S220: Perform a first inverse discrete Fourier transform (IDFT) on the modulated signals of each of the M subbands.

Optionally, the first IDFT of the modulated signal of the mth subband in the M subbands may be performed according to the following equation.

among them,

A signal obtained by phase-deflecting and/or cyclically shifting the modulated signal of the m-th sub-band or a signal obtained by cyclically shifting the modulated signal of the m-th sub-band, NK represents the order of the first IDFT, that is, the conversion is NK-order IDFT.

Optionally, an additional CP operation can also be performed. Taking the mth subband as an example, adding a CP operation can be,

Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m , (6)

U _cp,m represents the length of the CP at the QT _s granularity, ie

Q represents the upsampling rate,

K _max =f _s /Δf,f _s represents the bandwidth of the working frequency band of the transmitter,

T _c is the time occupied by each chip signal, and Δf represents the subcarrier frequency interval.

The signals of the individual subbands have the same sampling rate at this time, ie each sample point has an equal duration.

S230: Perform a second IDFT on the signal after the first IDFT of the M subbands.

The signals Y _m (u) and 0 ≤ m < M of the respective sub-bands at the time u·(QT _s ) are input and converted to acquire a sequence required for the subsequent operation.

For example, the second IDFT may be performed on the signal after the first IDFT of the M subbands according to the following equation.

Where L _f represents the length of the sequence of filter coefficients,

Indicates rounding up.

The sequence can be renamed to,

The second IDFT transform may be referred to as a class IDFT transform, which is different from a general IDFT transform, except that the number of input and output symbols may be unequal, and the value of the subscript of the output sequence is time-varying (and The time u of the input symbol is related to), and the number of output symbols of the general IDFT transform is equal to the number of input symbols, the subscript (or serial number) of the output sequence is not time-varying, and for the M-order IDFT, it is generally 0 to (M-1).

For example, the second IDFT transform, that is, the sequence Z after the class IDFT transform can be as shown in FIG. 4, and the number of symbols is QL _Q .

Alternatively, as an embodiment of the present invention, when K _max = ML, the above formula (7) can be simplified as

That is to say, in this case, the second IDFT is simplified to the M-th order IDFT as shown in FIG.

For example, in this case, the sequence Z after the M-th order IDFT can be as shown in FIG. 6, and the number of symbols is M.

This embodiment limits the air sampling rate based on the previous embodiment, and can be further simplified.

S240. Weight the sequence obtained by the second IDFT according to the filter coefficient sequence.

The sequence obtained by the second IDFT is weighted. Alternatively, if the length of the filter coefficient sequence does not match, the length of the filter coefficient sequence may be extended by _Lf to QL _Q by zero-padding, and filtering is implemented by weighting processing.

Optionally, in one embodiment of the invention, in the case of K _max ≠ ML, the sequence obtained by the second IDFT is multiplied by the sequence of filter coefficients.

In various embodiments of the invention, sequence multiplication refers to the fact that the elements of the two sequences are respectively multiplied, ie the kth element of the first sequence is multiplied by the kth element of the second sequence.

Specifically, in the case of K _max ≠ ML, the second IDFT is a class IDFT. As shown in Figures 3 and 4, the sequence obtained by the second IDFT can be directly multiplied by the filter coefficient sequence, namely:

Optionally, in another embodiment of the present invention, in the case of K _max = ML, the sequence obtained by the second IDFT is cyclically shifted and repeatedly extended and multiplied by the sequence of filter coefficients.

Specifically, in the case of K _max = ML, the second IDFT is an M-order IDFT. As shown in Figures 5 and 6, the sequence obtained by the second IDFT can be cyclically shifted and repeatedly spread and then multiplied by a sequence of filter coefficients. For example, the loop shift operation can be:

The sequence {Z ₀ , Z ₁ , ..., Z _M-1 } of the _M- th order IDFT transform is cyclically shifted by bQ elements, and the result is:

{Z _bQ ,...,Z _M-1 ,Z0,...,Z _bQ-1 }, where b is related to the time corresponding to signal Y.

The above sequence is further expanded into QL _Q symbols by repeated extension, and then multiplied according to the above formula (10).

Alternatively, cyclic shifts and repeated expansion operations can be exchanged.

S250, shifting and accumulating the weighted sequence to obtain a transmission signal.

Alternatively, the weighted sequence may be shifted and accumulated according to the following equation.

Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

among them,

The weighted sequence is represented, B(k) represents the sequence after the shift is accumulated, and B'(k) represents the sequence after shifting and outputting the transmission signal.

For example, for cache B, the initial elements in B are all 0, and the weighted sequence will be

Accumulate with the sequence in B, output the first Q elements in B, and then shift the sequence in B to zero for the next accumulation.

Shift zero padding can be expressed as the following equation.

B'=[B(Q:end),0 _1×Q ], (12)

The output signal can be expressed as the following equation.

s(n)=s(aNQ+bQ+k)=B(k), 0≤k<Q. (13)

Optionally, the output signal can be further subjected to frequency relocation (phase-by-sample phase rotation), such as:

Or move the signal directly to other frequencies.

Optionally, the phase deflection operation before the first IDFT may be moved to the first IDFT operation, and the signal outputted by the first IDFT is multiplied by the same phase deflection value; in addition, the cyclic shift operation before the first IDFT may also be replaced. The operation, for example, after the first IDFT operation, performs frequency relocation (phase-by-sample phase deflection) on the signal output by the first IDFT. The above two pre-processing can be combined.

For example, the specific can be:

The phase deflection can be,

Frequency relocation can be,

If you combine the two, you can,

Alternatively, there may be other variations, for example, the following conditions can be changed simultaneously:

Adjust the phase of the phase deflection to

Cancel the cyclic shift operation,

Replace the filter coefficient g with g _α ,

g _α (t)=g(t)·e ^{j2π(αΔf)(t)} , (19)

For discrete forms, you can,

or,

The delay can be arbitrary, for example, it can be:

Perform frequency shift adjustment on the last output signal,

Alternatively, in the case of K _max = ML, the rate conversion may be further performed, and the sampling rate is converted to other values to obtain a final transmitted signal.

In the embodiment of the present invention, the time is discretized, t=nT _s , n=(aN+b)Q+c, wherein

Indicates rounding down.

The Y _m (aN+b) sequence has one value per QT _s ; the output s(n) is one value per T _s .

The method for processing transmission data according to the embodiment of the present invention performs a first IDFT on a modulated signal of each of the M subbands, a second IDFT on a signal after the first IDFT of the M subbands, and then performs a second IDFT according to the filter coefficient. The sequence weights the sequence obtained by the second IDFT, which can convert the multiplexed filter into a single-path filtering, which reduces the computational complexity and can reduce the complexity of the filtering.

Further, the embodiment of the present invention performs OFDM operation on each sub-band, and the relationship between the up-sampling rate and the number of sub-bands of the sub-band signal is not limited, and thus is more universal and has a wider application range.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

The method of processing transmission data according to an embodiment of the present invention has been described in detail above, and a transmitter according to an embodiment of the present invention will be described below.

The transmitter of the embodiment of the present invention may be a base station or a UE, but the present invention is not limited thereto.

It should be understood that the transmitter of the embodiment of the present invention may perform the foregoing method of the embodiment of the present invention, that is, the specific working process of the following apparatus, and may refer to the corresponding process in the foregoing method embodiment.

FIG. 7 shows a schematic block diagram of a transmitter 700 in accordance with an embodiment of the present invention. As shown in FIG. 7, the transmitter 700 includes:

The modulation module 710 is configured to obtain, according to the transmission data of the M subbands in the working frequency band of the transmitter, a modulation signal of each of the M subbands, where M is a positive integer greater than one;

a first transform module 720, configured to perform a first discrete inverse Fourier transform IDFT on the modulated signals of each of the M subbands;

a second transform module 730, configured to perform a second IDFT on the signal after the first IDFT of the M subbands;

a weighting module 740, configured to weight the sequence obtained by the second IDFT according to the filter coefficient sequence;

The accumulating module 750 is configured to perform shift accumulation on the weighted sequence to obtain a transmission signal.

The transmitter of the embodiment of the present invention performs a first IDFT on the modulated signals of each of the M subbands, performs a second IDFT on the signals of the first sub-FTFT of the M subbands, and performs a second IDFT according to the sequence of the filter coefficients. The sequence obtained by the second IDFT is weighted, and the multiplexed filter can be converted into single-channel filtering, which reduces the computational complexity and can reduce the complexity of the filtering.

In an embodiment of the present invention, the modulation module 710 is specifically configured to separately perform coding and modulation processing on the transmission data of each of the M subbands to obtain a modulated signal of each of the M subbands. .

In an embodiment of the present invention, the first transform module 720 is specifically configured to perform a first IDFT on the modulated signal of the mth subband in the M subbands according to the following equation.

among them,

a signal obtained by phase-deflecting and/or cyclically shifting the modulated signal of the m-th sub-band or a signal of the m-th sub-band, NK indicating the order of the first IDFT, K being greater than or equal to L, and A power of 2 closest to L, L represents the sequence length of the modulation signal of each of the M subbands, and N is a positive integer.

In an embodiment of the present invention, the second transform module 730 is specifically configured to perform a second IDFT on the signal after the first IDFT of the M subbands according to the following equation.

Where Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m ,x _m represents the first IDFT of the mth subband of the M subbands The latter signal, U _cp,m represents the cyclic prefix CP length at the QT _s granularity, Q represents the upsampling rate, L _f represents the length of the filter coefficient sequence, K _max =f _s /Δf, f _s represents the transmitter The bandwidth of the working frequency band, Δf represents the subcarrier frequency interval, and L represents the sequence length of the modulated signal of each of the M subbands,

Indicates rounding up.

In an embodiment of the present invention, the weighting module 740 is specifically configured to multiply the sequence obtained by the second IDFT by the sequence of the filter coefficients.

In an embodiment of the present invention, the weighting module 740 is specifically configured to cyclically shift and repeat the sequence obtained by the second IDFT and multiply the sequence of the filter coefficients.

In an embodiment of the present invention, the accumulating module 750 is specifically configured to perform shift accumulation on the weighted sequence according to the following equation.

Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

among them,

Indicates the weighted sequence, B(k) represents the sequence after the shift accumulation, B'(k) represents the sequence after shifting the output signal, Q represents the upsampling rate, and _Lf represents the sequence of filter coefficients. length,

Indicates rounding up.

The transmitter 700 according to an embodiment of the present invention may be an execution body of the method 200 of processing transmission data according to an embodiment of the present invention, and the above and other operations and/or functions of the respective modules in the transmitter 700 are respectively implemented to implement the foregoing respective methods. The corresponding process, for the sake of brevity, will not be described here.

In the embodiment of the present invention, the OFDM operation is performed on each sub-band, and the relationship between the up-sampling rate and the number of sub-bands of the sub-band signal is not limited, and thus is more universal and has a wider application range.

8 shows a structure of a transmitter provided by still another embodiment of the present invention, including at least one processor 802 (for example, a CPU), at least one network interface 805 or other communication interface, a memory 806, and at least one communication bus 803. Used to implement connection communication between these devices. The processor 802 is configured to execute executable modules, such as computer programs, stored in the memory 806. The memory 806 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory. A communication connection with at least one other network element is achieved by at least one network interface 805 (which may be wired or wireless).

In some embodiments, the memory 806 stores a program 8061, and the processor 802 executes the program 8061 for performing the following operations:

Obtaining each of the M subbands according to the transmission data of the M subbands in the working frequency band of the transmitter a modulated signal of subbands, where M is a positive integer greater than one;

Performing a first discrete inverse Fourier transform IDFT on the modulated signals of each of the M subbands;

Performing a second IDFT on the signal after the first IDFT of the M subbands;

Weighting the sequence obtained by the second IDFT according to the filter coefficient sequence;

The weighted sequence is subjected to shift accumulation to obtain a transmission signal.

Optionally, the processor 802 is specifically configured to separately perform code modulation processing on the transmission data of each of the M subbands to obtain a modulation signal of each of the M subbands.

Optionally, the processor 802 is specifically configured to: perform a first IDFT on the modulated signal of the mth subband in the M subbands according to the following equation,

among them,

a signal obtained by phase-deflecting and/or cyclically shifting the modulated signal of the m-th sub-band or a signal of the m-th sub-band, NK indicating the order of the first IDFT, K being greater than or equal to L, and A power of 2 closest to L, L represents the sequence length of the modulation signal of each of the M subbands, and N is a positive integer.

Optionally, the processor 802 is specifically configured to: perform a second IDFT on the signal after the first IDFT of the M subbands according to the following equation,

Where Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m ,x _m represents the first IDFT of the mth subband of the M subbands The latter signal, U _cp,m represents the cyclic prefix CP length at the QT _s granularity, Q represents the upsampling rate, L _f represents the length of the filter coefficient sequence, K _max =f _s /Δf, f _s represents the transmitter The bandwidth of the working frequency band, Δf represents the subcarrier frequency interval, and L represents the sequence length of the modulated signal of each of the M subbands,

Indicates rounding up.

Optionally, the processor 802 is specifically configured to multiply the sequence obtained by the second IDFT by the sequence of the filter coefficients.

Optionally, the processor 802 is specifically configured to cyclically shift and repeat the sequence obtained by the second IDFT and multiply the sequence of the filter coefficients.

Optionally, the processor 802 is specifically configured to: perform a shift accumulation on the weighted sequence according to the following equation,

Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

among them,

Indicates the weighted sequence, B(k) represents the sequence after the shift accumulation, B'(k) represents the sequence after shifting the output signal, Q represents the upsampling rate, and _Lf represents the sequence of filter coefficients. length,

Indicates rounding up.

Optionally, the transmitter is a base station or a user equipment.

As can be seen from the foregoing technical solutions provided by the embodiments of the present invention, the first IDFT is performed on the modulated signals of each of the M subbands, and the signal after the first IDFT of the M subbands is performed. IDFT, according to the sequence of the filter coefficient system, weights the sequence obtained by the second IDFT, can convert the multiplexed filter into single-channel filtering, reduces the computational complexity, and can reduce the complexity of the filtering.

It is to be understood that the specific embodiments of the present invention are not intended to limit the scope of the embodiments of the invention.

It should be understood that in the embodiment of the present invention, the term "and/or" is merely an association relationship describing an associated object, indicating that there may be three relationships. For example, A and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, what is shown or discussed between each other The coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (15)

1. A method for processing transmitted data, comprising:

   Acquiring, according to the transmission data of the M subbands in the working frequency band of the transmitter, a modulation signal of each of the M subbands, where M is a positive integer greater than one;

   Performing a first discrete inverse Fourier transform IDFT on the modulated signals of each of the M subbands;

   Performing a second IDFT on the signal after the first IDFT of the M subbands;

   Weighting the sequence obtained by the second IDFT according to the filter coefficient sequence;

   The weighted sequence is subjected to shift accumulation to obtain a transmission signal.
2. The method according to claim 1, wherein the acquiring the modulated signal of each sub-band in the M sub-band according to the transmission data of the M sub-bands in the working frequency band of the transmitter comprises:

   The transmission data of each of the M subbands is separately subjected to code modulation processing to obtain a modulation signal of each of the M subbands.
3. The method according to claim 1 or 2, wherein the performing a first discrete inverse Fourier transform IDFT on the modulated signals of each of the M subbands respectively comprises:

   Performing a first IDFT on a modulated signal of the mth subband of the M subbands according to the following equation,

   

   among them,

   

   a signal obtained by phase-deflecting and/or cyclically shifting a modulated signal of the m-th sub-band or a modulated signal of the m-th sub-band, NK indicating an order of the first IDFT, and K being greater than or equal to L And a power of 2 closest to L, L represents the sequence length of the modulation signal of each of the M subbands, and N is a positive integer.
4. The method according to any one of claims 1 to 3, wherein the performing the second IDFT on the signal after the first IDFT of the M subbands comprises:

   Performing a second IDFT on the signal after the first IDFT of the M subbands according to the following equation,

   

   aNQ+bQ≤n<aNQ+bQ+QL _Q ,

   

   Where Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m ,x _m represents the first of the mth subband of the M subbands The IDFT signal, U _cp,m represents the cyclic prefix CP length at the QT _s granularity, Q represents the upsampling rate, L _f represents the length of the filter coefficient sequence, K _max =f _s /Δf, f _s represents The bandwidth of the working frequency band of the transmitter, Δf represents the subcarrier frequency interval, and L represents the number of subcarriers in each of the M subbands,

   

   Indicates rounding up.
5. The method according to any one of claims 1 to 4, wherein the weighting the sequence obtained by the second IDFT according to the filter coefficient series comprises:

   The sequence obtained by the second IDFT is multiplied by the sequence of filter coefficients.
6. The method according to any one of claims 1 to 4, wherein the weighting the sequence obtained by the second IDFT according to the filter coefficient series comprises:

   The sequence obtained by the second IDFT is cyclically shifted and repeatedly spread and multiplied by the sequence of filter coefficients.
7. The method according to any one of claims 1 to 6, wherein the shifting and accumulating the weighted sequence to obtain a transmission signal comprises:

   Shifting the weighted sequence according to the following equation,

   

   0 ≤ k < QL _Q ,

   

   Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

   among them,

   

   Representing the weighted sequence, B(k) represents the sequence after the shift accumulation, B'(k) represents a sequence after shifting the output signal, Q represents an upsampling rate, and _Lf represents the sequence The length of the sequence of filter coefficients,

   

   Indicates rounding up.
8. A transmitter, comprising:

   a modulation module, configured to acquire, according to the transmission data of the M subbands in the working frequency band of the transmitter, a modulation signal of each of the M subbands, where M is a positive integer greater than one;

   a first transform module, configured to perform a first discrete Fourier transform (IDFT) on the modulated signal of each of the M subbands, respectively;

   a second transform module, configured to perform a second IDFT on the signal after the first IDFT of the M subbands;

   a weighting module, configured to weight the sequence obtained by the second IDFT according to the sequence of the filter coefficient system;

   The accumulation module is configured to perform a shift accumulation on the weighted sequence to obtain a transmission signal.
9. The transmitter according to claim 8, wherein the modulation module is specifically configured to separately perform coding and modulation processing on transmission data of each of the M subbands to obtain each of the M subbands. With a modulated signal.
10. The transmitter according to claim 8 or 9, wherein the first transform module is specifically configured to perform, according to the following equation, a modulated signal of an mth subband of the M subbands according to an equation First IDFT,

    

    among them,

    

    a signal obtained by phase-deflecting and/or cyclically shifting a modulated signal of the m-th sub-band or a modulated signal of the m-th sub-band, NK indicating an order of the first IDFT, and K being greater than or equal to L And a power of 2 closest to L, L represents the sequence length of the modulation signal of each of the M subbands, and N is a positive integer.
11. The transmitter according to any one of claims 8 to 10, wherein the second transform module is specifically configured to perform a second signal after the first IDFT of the M subbands according to the following equation IDFT,

    

    aNQ+bQ≤n<aNQ+bQ+QL _Q ,

    

    Where Y _m (u)=x _m ((uU _cp,m )%(NK)), 0≤u<NK+U _cp,m ,x _m represents the first of the mth subband of the M subbands The IDFT signal, U _cp,m represents the cyclic prefix CP length at the QT _s granularity, Q represents the upsampling rate, L _f represents the length of the filter coefficient sequence, K _max =f _s /Δf, f _s represents The bandwidth of the working frequency band of the transmitter, Δf represents the subcarrier frequency interval, and L represents the number of subcarriers in each of the M subbands,

    

    Indicates rounding up.
12. The transmitter according to any one of claims 8 to 11, wherein the weighting module is specifically configured to multiply the sequence obtained by the second IDFT by the sequence of filter coefficients.
13. The transmitter according to any one of claims 8 to 12, wherein the weighting module is specifically configured to cyclically shift and repeat the sequence obtained by the second IDFT and multiply the filtering Sequence of coefficients.
14. The transmitter according to any one of claims 8 to 13, wherein the accumulating module is specifically configured to perform shift accumulation on the weighted sequence according to the following equation.

    

    0 ≤ k < QL _Q ,

    

    Shifting the output of the first Q elements of the sequence B(k) after the shift accumulation as the transmission signal,

    among them,

    

    Representing the weighted sequence, B(k) represents the sequence after the shift accumulation, B'(k) represents a sequence after shifting the output signal, Q represents an upsampling rate, and _Lf represents the sequence The length of the sequence of filter coefficients,

    

    Indicates rounding up.
15. A transmitter according to any one of claims 8 to 14, wherein the transmitter is a base station or a user equipment.

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