CN107438037B

CN107438037B - Data transmission method and related device

Info

Publication number: CN107438037B
Application number: CN201610364278.6A
Authority: CN
Inventors: 屈代明; 邱玉; 江涛; 陈磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-05-27
Filing date: 2016-05-27
Publication date: 2020-03-27
Anticipated expiration: 2036-05-27
Also published as: CN107438037A

Abstract

The embodiment of the invention relates to the technical field of communication, in particular to a data transmission method and a data transmission device, which are used for reducing the interference of a data signal which is the same as a time domain symbol of a pilot signal to the pilot signal in a frequency domain and improving the accuracy of channel estimation. In the embodiment of the present invention, different filter coefficients are used to perform frequency domain filtering processing on the first data signal and the pilot signal, so that a range of signals overlapping between the first data signal and the pilot signal in the frequency domain is reduced, that is, interference of the first data signal on the pilot signal in the frequency domain is reduced, and accuracy of channel estimation is improved.

Description

Data transmission method and related device

Technical Field

The present invention relates to the field of communications, and in particular, to a data transmission method and a related apparatus.

Background

The Filter Bank Multi-carrier (FBMC) is a Multi-carrier modulation technique, and compared with Orthogonal Frequency Division Multiplexing (OFDM), the FBMC has lower out-of-band radiation and higher spectral efficiency, and has a good application prospect. A typical implementation of FBMC is to use Orthogonal Frequency Division Multiplexing (OFDM) -Offset Quadrature Amplitude Modulation (OQAM) technology. The OFDM-OQAM is specifically an OFDM signal based on OQAM modulation.

The OFDM-OQAM transmits pure real number or pure imaginary number OQAM symbols, and realizes the orthogonality of transmission signals in frequency domain and time domain by using the real number domain orthogonality characteristic of a prototype filter. In addition, due to the good time-frequency local characteristic of the prototype filter, the OFDM-OQAM can achieve better transmission performance in a fading channel on the premise of not adding a Cyclic Prefix (CP for short), and compared with the OFDM, the throughput of the system is improved. OFDM-OQAM may also be referred to as FBMC or FBMC-OQAM.

An important feature of FBMC is that adjacent subcarriers and adjacent FBMC symbols may interfere with each other to varying degrees. A transmitted symbol on any one time-frequency resource may generate additional received signals on adjacent time-frequency resource locations, thereby causing interference to the desired received signal. The interference being obtained by a filter bankExpressed by a multiplexer Response (TMUX), the TMUX Response reflects the degree of spreading of a transmission symbol at a certain time-frequency position to a peripheral time-frequency position under ideal channel conditions. An example of a typical TMUX response table is given in table 1, where j represents an imaginary number in the contents of table 1, such as j represents an imaginary number in j 0.0429. The columns in table 1 represent the subcarrier numbers and the rows the numbers of FBMC symbols. The coefficients in the table represent the coefficients of the received symbols generated at the sub-carriers and symbol positions corresponding to the surrounding of the symbol transmitted at the center position (i.e., sub-carrier 0 and symbol 0). For example, assume that the transmit symbol at the center position is s₀The coefficient of the position of the subcarrier i and the symbol j is a_i,jThen s₀A received symbol a is generated at the position of subcarrier i and symbol j_i,j×s₀. If left unprocessed, this symbol will interfere with the reception of the useful symbol transmitted at that location, which is known as the inherent interference of the FBMC.

TABLE 1 TMUX response Table example

For FBMC, there are two main types of pilot signals for channel estimation: block pilot signals (PreamblePilots) and Scattered Pilots (Scattered Pilots). The method for implementing the distributed pilot signal mainly comprises the following steps: the pilot signal is randomly inserted into the middle of the data signal in a frequency domain and a time domain, at this time, the data signal with the same symbol as the time domain symbol of the pilot signal may cause interference to the pilot signal in the frequency domain, and at this time, the problem of inaccurate data may be caused by using the interfered pilot signal to perform channel estimation.

Disclosure of Invention

Embodiments of the present invention provide a data transmission method and a related apparatus, so as to reduce, in a frequency domain, interference caused by a data signal having the same time domain symbol as a pilot signal on the pilot signal, and improve accuracy of channel estimation.

An embodiment of the present invention provides a data transmission method, including:

a transmitting device generates a pilot signal and a first data signal; the transmitting device uses different filter coefficients to respectively carry out frequency domain filtering processing on the first data signal and the pilot signal; the transmitting device transmits the pilot signal and the first data signal after the frequency domain filtering processing;

in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range; the first overlapping signal range is a signal range in which overlapping signals exist between the first data signal and the pilot signal if different filter coefficients are used for respectively carrying out frequency domain filtering operation on the first data signal and the pilot signal; the second overlapping signal range is a range of signals in which there is an overlap between the first data signal and the pilot signal if the first data signal and the pilot signal are respectively subjected to frequency domain filtering operations using the same filter coefficients.

In this way, since the first data signal and the pilot signal are respectively subjected to frequency domain filtering processing by using different filter coefficients, the range of signals with overlapping between the first data signal and the pilot signal in the frequency domain is reduced, that is, the interference of the first data signal to the pilot signal in the frequency domain is reduced, and the accuracy of channel estimation is improved.

That is to say, in the embodiment of the present invention, since the transmitting apparatus performs frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients, accordingly, the receiving apparatus also performs analysis processing on the received first data signal and the pilot signal by using corresponding filters, and further, since the first data signal and the pilot signal are respectively performed frequency domain filtering processing by using different filter coefficients, a range of signals in which there is an overlap between the first data signal and the pilot signal in a frequency domain is reduced, that is, interference of the first data signal on the pilot signal in the frequency domain is reduced, that is, accuracy of the pilot signal analyzed by the receiving apparatus is improved, thereby improving accuracy of channel estimation.

Optionally, the transmitting apparatus separately frequency-domain filters the first data signal and the pilot signal using different filter coefficients, and includes: the transmitting device uses the filter coefficient corresponding to the SINC waveform to carry out frequency domain filtering on the pilot signal; the transmission apparatus performs frequency-domain filtering on the first data signal using filter coefficients corresponding to a waveform different from the SINC waveform.

Since the SINC waveform has almost 0 values at other frequency domain sampling positions except the center position, the interference of the first data signal to the pilot signal is almost zero, and at this time, the interference of the first data signal to the pilot signal is greatly reduced.

Optionally, the filter coefficient corresponding to the SINC waveform is 1. That is, the SINC waveform is used to perform frequency-domain filtering on the pilot signal, and the specific operation is to keep the value of the pilot signal unchanged, i.e., the frequency-domain filtering operation is completed by multiplying the pilot signal by 1. Therefore, the values of the pilot signal at the sampling positions of other frequency domains are all guaranteed to be 0, so that the interference of the first data signal to the pilot signal is almost zero, and at the moment, the interference of the first data signal to the pilot signal is reduced to a great extent.

Optionally, before the sending apparatus separately frequency-domain filters the first data signal and the pilot signal by using different filter coefficients, the sending apparatus further includes: the sending device generates a second data signal, and the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; the transmitting device carries out frequency domain filtering processing on the second data signal; the transmitting device transmits the second data signal after the frequency domain filtering processing; in the time domain, the second data signal after being processed by frequency domain filtering is adjacent to a time domain symbol occupied by the pilot signal; and in the frequency domain, the second data signal after the frequency domain filtering processing is the same as the subcarrier occupied by the pilot signal.

Alternatively, the invalid data signal that does not need to be parsed may be data that is all zeros, or data known to some specific receiving device, or the like, i.e., invalid data that the receiving device may discard. Since the invalid data is transmitted in the second data signal, the invalid data does not interfere with the pilot signal, or even if the invalid data interferes with the pilot signal, since the invalid data receiving apparatus is known, the receiving apparatus can successfully remove the interference suffered by the pilot signal, thereby improving the accuracy of channel estimation according to the pilot signal.

Optionally, the method further comprises: the transmitting apparatus does not transmit the data signal on a time domain symbol adjacent to a time domain symbol occupied by the pilot signal with respect to the subcarrier occupied by the pilot signal. Therefore, the time domain symbol adjacent to the time domain symbol occupied by the pilot signal can not cause interference to the pilot signal, and the accuracy of channel estimation according to the pilot signal is improved.

the receiving device receives a pilot signal and a first data signal; the receiving device analyzes the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal;

the first data signal and the pilot signal are obtained by respectively carrying out frequency domain filtering processing by using different filter coefficients; in the time domain, the first data signal after the frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the conditions for satisfying different filter coefficients are similar to those described above, and are not described herein again. That is to say, in the embodiment of the present invention, since the transmitting apparatus performs frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients, accordingly, the receiving apparatus also performs analysis processing on the received first data signal and the pilot signal by using corresponding filters, and further, since the first data signal and the pilot signal are respectively performed frequency domain filtering processing by using different filter coefficients, a range of signals in which there is an overlap between the first data signal and the pilot signal in a frequency domain is reduced, that is, interference of the first data signal on the pilot signal in the frequency domain is reduced, that is, accuracy of the pilot signal analyzed by the receiving apparatus is improved, thereby improving accuracy of channel estimation.

Optionally, the filter coefficient corresponding to the pilot signal is a filter coefficient corresponding to the SINC waveform. Since the SINC waveform has almost 0 values at other frequency domain sampling positions except the center position, the interference of the first data signal to the pilot signal is almost zero, and at this time, the interference of the first data signal to the pilot signal is greatly reduced.

Optionally, the method further comprises: the receiving device receives a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the receiving device discards the second data signal.

An embodiment of the present invention provides a transmitting apparatus, including:

a processing unit for generating a pilot signal and a first data signal; respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients;

a transmitting unit, configured to transmit the pilot signal and the first data signal after the frequency domain filtering processing; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the conditions for satisfying different filter coefficients are similar to those described above, and are not described herein again.

Optionally, the processing unit is specifically configured to: carrying out frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform; the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform.

Optionally, the processing unit is further configured to: generating a second data signal, wherein the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; performing frequency domain filtering processing on the second data signal;

a sending unit, further configured to: sending the second data signal after the frequency domain filtering processing;

in the time domain, the second data signal after being processed by frequency domain filtering is adjacent to a time domain symbol occupied by the pilot signal; and in the frequency domain, the second data signal after the frequency domain filtering processing is the same as the subcarrier occupied by the pilot signal.

Optionally, the sending unit is further configured to: and aiming at the subcarriers occupied by the pilot signals, not sending data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals. Therefore, the time domain symbol adjacent to the time domain symbol occupied by the pilot signal can not cause interference to the pilot signal, and the accuracy of channel estimation according to the pilot signal is improved.

An embodiment of the present invention provides a receiving apparatus, including:

a receiving unit for receiving a pilot signal and a first data signal; the first data signal and the pilot signal are obtained by respectively carrying out frequency domain filtering processing by using different filter coefficients; in the time domain, the first data signal after the frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

and the processing unit is used for analyzing the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal.

Optionally, the receiving unit is further configured to: receiving a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the processing unit is further configured to discard the second data signal.

a memory for storing programs and instructions;

a transmitter for communicating with a receiving device; specifically, the method is used for transmitting a pilot signal and a first data signal after frequency domain filtering processing;

a processor for executing, by calling programs and instructions stored in the memory:

generating a pilot signal and a first data signal; respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients;

transmitting, by a transmitter, the pilot signal and the first data signal after the frequency domain filtering process; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the different filter coefficients satisfy the condition: similar to the above, the description is omitted here.

Optionally, the processor is specifically configured to: carrying out frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform; the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform.

Optionally, the processor is further configured to: generating a second data signal, wherein the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; performing frequency domain filtering processing on the second data signal;

a transmitter, further configured to: sending the second data signal after the frequency domain filtering processing;

Optionally, the transmitter is further configured to: and aiming at the subcarriers occupied by the pilot signals, not sending data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals. Therefore, the time domain symbol adjacent to the time domain symbol occupied by the pilot signal can not cause interference to the pilot signal, and the accuracy of channel estimation according to the pilot signal is improved.

a memory for storing programs and instructions;

a receiver for communicating with a transmitting device; specifically, the method includes receiving a pilot signal and a first data signal transmitted by a transmitting apparatus;

receiving, by a receiver, a pilot signal and a first data signal; the first data signal and the pilot signal are obtained by respectively carrying out frequency domain filtering processing by using different filter coefficients; in the time domain, the first data signal after the frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the pilot signal and the first data signal are analyzed according to different filter coefficients corresponding to the pilot signal and the first data signal.

Wherein the different filter coefficients satisfy the condition: similar to the above, the description is omitted here.

Optionally, the receiver is further configured to: receiving a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the processor is further configured to discard the second data signal.

In the embodiment of the invention, a pilot signal and a first data signal are generated, different filter coefficients are used for respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal, and the pilot signal and the first data signal after the frequency domain filtering processing are sent; and the time domain symbols occupied by the first data signal after the frequency domain filtering processing on the time domain are the same as those occupied by the pilot signal, and the subcarriers occupied by the first data signal after the frequency domain filtering processing on the frequency domain are adjacent to those occupied by the pilot signal. Further, the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range; the first overlapping signal range is a signal range in which overlapping signals exist between the first data signal and the pilot signal if different filter coefficients are used for respectively carrying out frequency domain filtering operation on the first data signal and the pilot signal; the second overlapping signal range is a range of signals in which there is an overlap between the first data signal and the pilot signal if the first data signal and the pilot signal are respectively subjected to frequency domain filtering operations using the same filter coefficients. In this way, since the first data signal and the pilot signal are respectively subjected to frequency domain filtering processing by using different filter coefficients, the range of signals with overlapping between the first data signal and the pilot signal in the frequency domain is reduced, that is, the interference of the first data signal to the pilot signal in the frequency domain is reduced, and the accuracy of channel estimation is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.

FIG. 1a is a schematic diagram of a system architecture suitable for use in embodiments of the present invention;

FIG. 1b is a schematic flow chart of a method for processing FS-FBMC according to an embodiment of the present invention;

FIG. 1c is a schematic diagram of interference between data signals according to an embodiment of the present invention;

fig. 2a is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 2b is a diagram illustrating interference between a data signal and a pilot signal according to an embodiment of the present invention;

fig. 2c is a schematic diagram of interference between a data signal and a pilot signal according to another embodiment of the present invention;

fig. 2d is a schematic diagram of a distribution structure of pilot signals and data signals in time domain and frequency domain according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a transmitting apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a receiving apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another transmitting apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another receiving apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) System, a Long Term Evolution (Long Term Evolution) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, a Universal Mobile Telecommunications System (UMTS) System, a Worldwide Interoperability for Microwave Access (WiMAX) Communication System, a future 5G Communication System, and the like.

Fig. 1a shows a schematic architecture diagram of a communication system to which an embodiment of the invention is applied. As shown in FIG. 1a, the communication system 100 may include a network device 101 and terminal devices 102-104 connected by wireless or wired connections or other means. The sending device in the embodiment of the present invention may be a network device 101, and the receiving device may be a terminal device 102; alternatively, the transmitting apparatus may be the terminal device 102, and the receiving apparatus may be the network device 101.

The terminal device 102 may communicate with one or more core networks via a Radio Access Network (RAN), and the terminal device may refer to a User Equipment (UE), an Access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, and the like.

The network device 101 may be a device for communicating with a terminal device, and for example, may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or the network device may be a relay Station, an access point, a vehicle-mounted device, a wearable device, a network-side device in a future 5G network, or a network device in a future evolved PLMN network.

The transmitting device in the embodiment of the present invention is configured to generate a pilot signal and a data signal, where the generated data signal includes a first data signal and the like, and the first data signal is used to carry valid data that needs to be analyzed by the receiving device. The pilot signals are conventional pilot signals, such as pilot signals for channel estimation, and the like. The transmission apparatus performs frequency domain mapping on the generated pilot signal and the first data signal, performs Inverse Fast Fourier Transform (IFFT) conversion on the result, and transmits data. After receiving the data, the receiving apparatus performs Fast Fourier Transform (FFT) change, and recovers a pilot signal and a data signal from the received data.

FFT is a general term for an efficient and fast calculation method for calculating Discrete Fourier Transform (DFT) by using a computer. The multiplication times required by a computer for calculating the discrete Fourier transform can be greatly reduced by adopting the algorithm, and particularly, the more the number N of the transformed sampling points is, the more remarkable the calculation amount of the FFT algorithm is saved. The basic idea of FFT is to decompose the original N-point sequence into a series of short sequences in turn. The symmetrical property and the periodic property of the exponential factors in the DFT calculation formula are fully utilized, and then the DFTs corresponding to the short sequences are calculated and properly combined, so that the aims of deleting repeated calculation, reducing multiplication and simplifying the structure are fulfilled.

In the embodiment of the present invention, optionally, the sending apparatus is implemented based on a frequency domain spreading FBMC (frequency warping FBMC, abbreviated as FS-FBMC). FIG. 1b is a schematic diagram illustrating a flow of a method for processing FS-FBMC according to an embodiment of the present invention, and as shown in FIG. 1b, an optional basic implementation flow of FS-FBMC first generates d_i、d_i+1And d_i+2In this example, d_i、d_i+1And d_i+2After the three data signals are generated for the data signal, the three data signals are frequency domain spread.

As shown in FIG. 1b, the data signal d to be transmitted is treated with the frequency domain response of the filter_iNumber ofAccording to the signal d_i+1And a data signal d_i+2Are expanded separately, i.e. d_i、d_i+1、d_i+2Are multiplied by the filter coefficients, respectively. Wherein, in FIG. 1b, the same filter coefficients are used for d_i、d_i+1、d_i+2The multiplication is carried out, and the filter coefficient can be obtained by carrying out FFT (fast Fourier transform) on the time domain impulse response of the filter, or can be directly obtained by the frequency domain design method of some filters, such as a frequency sampling method.

If the same filter coefficient pair d is used_i、d_i+1And d_i+2Frequency domain expansion is performed, and in this example, a filter coefficient directly designed based on a frequency sampling method is assumed, and the filter coefficient is composed of 7 nonzero values, that is, H ═ H₃,H₂,H₁,H₀,H₁,H₂,H₃]Where H is the set of filter coefficients, H₃、H₂、H₁、H₀、H₁、H₂、H₃Respectively 7 filter coefficients, it is clear that the set of filter coefficients is symmetric about the center. A typical value method is: h₀＝1，H₁＝0.971960，

H₃0.235147. Obviously, d_iThe corresponding transmitted data after frequency spreading will be represented by 7 values, i.e. [ d ]_iH₃,d_iH₂,d_iH₁,d_iH₀,d_iH₁,d_iH₂,d_iH₃]；d_i+1The corresponding transmitted data after frequency spreading will be represented by 7 values, i.e. [ d ]_i+1H₃,d_i+1H₂,d_i+1H₁,d_i+1H₀,d_i+1H₁,d_i+1H₂,d_i+1H₃]；d_i+2The corresponding transmitted data after frequency spreading will be represented by 7 values, i.e. [ d ]_i+2H₃,d_i+2H₂,d_i+2H₁,d_i+2H₀,d_i+2H₁,d_i+2H₂,d_i+2H₃]。

Mapping the data after frequency domain expansion on the frequency domain sampling point, as shown in FIG. 1b, on the frequency domain, the pair d_iAfter frequency domain expansion d_iH₃,d_iH₂,d_iH₁,d_iH₀,d_iH₁,d_iH₂,d_iH₃]Mapping seven data on frequency domain sampling points; similarly, in the frequency domain, d will be the pair_i+1After frequency domain expansion d_i+1H₃,d_i+1H₂,d_i+1H₁,d_i+1H₀,d_i+1H₁,d_i+1H₂,d_i+1H₃]Mapping seven data on frequency domain sampling points; in the frequency domain, will be d_i+2After frequency domain expansion d_i+2H₃,d_i+2H₂,d_i+2H₁,d_i+2H₀,d_i+2H₁,d_i+2H₂,d_i+2H₃]Seven data are mapped on frequency domain sampling points, wherein the central positions of two adjacent frequency domain expanded data signals are different by K frequency sampling points, specifically, d_iAnd d_i+1Adjacent, frequency domain extended data signal d_iHas data of the center position of d_iH₀Data signal d after frequency domain spreading_i+1Has data of the center position of d_i+1H₀，d_iH₀And d_i+ ₁H₀With K frequency samples in between. Similarly, d_i+1H₀And d_i+2H₀With K frequency samples in between. I.e. if d_iH₀When the sampling frequency of (1) is iK, then d_i+1H₀When the frequency sampling point of (i +1) K, d_i+2H₀Is (i +2) K.

In this example, K is the overlap factor of the prototype filter, which represents the symbol-to-symbol ratio of the FBMCI.e.: in time domain, 2K OQAM symbols are overlapped with each other. In this example, K equals 4. Obviously, there is some overlap between two adjacent frequency domain extended data, as shown in FIG. 1b, d_iThree values d on the right side of_iH₁、d_iH₂、d_iH₃And d is_i+1Left three values of d_i+1H₃,d_i+1H₂And d_i+1H₁The positions are overlapped, and in the frequency domain mapping, the data overlapped at the positions may be added. Similarly, d_i+1Three values d on the right side of₊₁H₁、d_i+1H₂、d_i+1H₃And d is_i+2Left three values of d_i+ ₂H₃,d_i+2H₂And d_i+2H₁The positions are overlapping. In the frequency domain mapping, the data overlapping at these positions may be added. After frequency domain mapping, performing KM point IFFT on the mapped data to generate a time domain symbol, where M represents the total number of data to be transmitted. Finally, the IFFT-transformed data is subjected to overlap-add, K × M (where x is the meaning of multiplication) dot data output each time is shifted backward by M/2 samples, and overlap-add (overlap/sum) is performed on the dot data and the previous data, and then data x (n) is output to the receiving apparatus.

As can be seen from the above, the filter coefficients of all data signals are the same in the frequency domain, i.e., the frequency domain spreading is the same in all subcarriers, so that the orthogonality of FBMC can be ensured. It is also seen that there is an overlapping signal range for data between adjacent subcarriers, which can lead to interference between adjacent subcarriers. Fig. 1c is a schematic diagram illustrating interference between data signals according to an embodiment of the present invention, where in a frequency domain, when a data signal is subjected to a frequency domain filtering process using the same filter coefficient, such as the processing method shown in fig. 1b, a larger signal overlapping area is generated between adjacent data signals when a frequency domain expansion process is performed using the same filter coefficient. As shown in FIG. 1c, each signal is spread in frequency domain fAfter development, the structure is shown in FIG. 1c, and the signal 1201 can be d_iThe signal 1202 may be d_i+1The signal 1203 may be d_i+2The signal 1201, the signal 1202, and the signal 1203 may be data signals, and an overlapping signal range 1204 between the signal 1201 and the signal 1202 occupies a position of half of the signal 1202, and an overlapping signal range 1205 between the signal 1202 and the signal 1203 occupies a position of half of the signal 1202. As can be seen, in the frequency domain, for adjacent data signals, such as the signal 1201 and the signal 1202, if the frequency domain filtering processing is performed by using the same filter coefficient, the overlapping signal range between the data signals is wide.

Due to the orthogonality of FBMC, the overlapping signal range after frequency domain spreading between adjacent data signals does not bring much interference, since the interference can be removed in the receiving device based on the real part orthogonality property of the filter. However, in fig. 1c, when signal 1202 is a pilot signal and signals 1201 and 1203 are data signals, interference of signal 1201 to pilot signal 1202 is large and interference of signal 1203 to pilot signal 1202 is also large, and in this case, pilot signal 1202 receives large interference, so that it is inaccurate when channel estimation is performed.

In view of the foregoing problems, embodiments of the present invention provide a data transmission method in an FBMC system, which uses different filter coefficients to perform frequency-domain filtering processing on a first data signal and a pilot signal respectively, so that a range of signals overlapping between the first data signal and the pilot signal in a frequency domain is reduced, that is, interference of the first data signal on the pilot signal in the frequency domain is reduced, and accuracy of channel estimation is improved.

Fig. 2a schematically shows a flow chart of a data transmission method provided by an embodiment of the present invention.

Based on the system architecture shown in fig. 1a, as shown in fig. 2a, a data transmission method provided in an embodiment of the present invention may optionally be applied to an FBMC system, where the method includes:

step 201, a transmitting device generates a pilot signal and a first data signal;

step 202, the transmitting device uses different filter coefficients to respectively perform frequency domain filtering processing on the first data signal and the pilot signal;

step 203, the transmitting device transmits the pilot signal and the first data signal after the frequency domain filtering processing;

step 204, the receiving device receives a pilot signal and a first data signal;

step 205, the receiving apparatus analyzes the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal;

Fig. 2b is a schematic diagram illustrating interference between a data signal and a pilot signal according to an embodiment of the present invention, and based on the above example in fig. 1b, if d is given_i+1Is a pilot signal, and d_iAnd d_i+2For data signals, the data signal and the pilot signal are separately frequency-domain filtered using different filter coefficients, e.g. the data signal d is filtered using a first filter coefficient_iAnd a data signal d_i+2Frequency domain filtering is performed using the second filter coefficients for the pilot signal d_i+1The frequency domain filtering is performed, the first filter coefficient is different from the second filter coefficient, and a schematic diagram of interference between the data signal and the pilot signal after the frequency domain filtering is shown in fig. 2b, the pilot signal 2102 is located between the signal 1201 and the signal 1203, and both the signal 1201 and the signal 1203 are data signals, and at this time, the overlapping signal range 2104 and the overlapping signal range 2105 are the first overlapping signal range. If the signal 1202 in fig. 1c is taken as a pilot signal, then in fig. 1c the same filter coefficients are used for frequency-domain filtering the data signal and the pilot signal, i.e. when the data signal and the pilot signal are frequency-domain filtered using the first filter coefficients, in fig. 1c the overlapping signal range 1204 and the overlapping signal range 1205 are the second overlapping signal range. The first filter coefficients and the second filter coefficients fulfil the condition that the overlapping signal range 2104 is less than the overlapping signal range 1204 and the overlapping signal range 2105 is less than the overlapping signal range 1205.

Because the pilot signal is known data relative to the receiving device, it may not be required that the pilot signal completely does not interfere with the data signal, and the receiving device may eliminate interference from the pilot signal to the data signal according to the known pilot signal and the filter coefficient, but the data signal and the pilot signal occupy the same time domain symbol, and the subcarriers of the data signal are adjacent to the subcarriers of the pilot signal, that is, the first data signal is unknown to the receiving device, and therefore, during data transmission, it is necessary to reduce interference from the first data signal to the pilot signal as much as possible.

Optionally, filter coefficients in the embodiment of the present invention have multiple choices, and an optional implementation is provided in the embodiment of the present invention, where the frequency-domain filtering is performed on the first data signal and the pilot signal by using different filter coefficients, respectively, where the frequency-domain filtering includes: carrying out frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform; the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform. Since the SINC waveform has 0 values at other frequency domain sampling positions except the center position, the interference of the first data signal to the pilot signal is almost zero, and at this time, the interference of the first data signal to the pilot signal is greatly reduced.

Specifically, a method for inserting a subcarrier for carrying pilot signal data between subcarriers corresponding to adjacent data signals and performing frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform, specifically, the pilot signal is directly mapped to the center position of the subcarrier corresponding to two data signals, because the SINC waveform has a value of 0 at other frequency domain sampling positions except the center position. Optionally, the filter coefficient corresponding to the SINC waveform is 1. That is, the SINC waveform is used to perform frequency-domain filtering on the pilot signal, and the specific operation is to keep the value of the pilot signal unchanged, i.e., the frequency-domain filtering operation is completed by multiplying the pilot signal by 1. Fig. 2c is a schematic diagram illustrating another interference between a data signal and a pilot signal according to an embodiment of the present invention, and based on the above example in fig. 1b, if d is given_i+1For pilot signals, let d_iAnd d_i+2For data signals, the data signal and the pilot signal are separately frequency-domain filtered using different filter coefficients, e.g. the data signal d is filtered using a first filter coefficient_iAnd a data signal d_i+2Filtering in frequency domain, and using filter coefficient corresponding to SINC waveform to obtain pilot signal d_i+1The frequency-domain filtering is performed, the first filter coefficient is different from the filter coefficient corresponding to the SINC waveform, and a schematic diagram of interference between the data signal and the pilot signal after the frequency-domain filtering is shown in fig. 2c, the pilot signal 2202 is located between the signal 1201 and the signal 1203, and both the signal 1201 and the signal 1203 are data signals, and at this time, the overlapping signal range 2204 and the overlapping signal range 2205 are the first overlapping signal range. If the signal 1202 in fig. 1c is taken as a pilot signal, then in fig. 1c the same filter coefficients are used for frequency-domain filtering the data signal and the pilot signal, i.e. when the data signal and the pilot signal are frequency-domain filtered using the first filter coefficients, in fig. 1c the overlapping signal range 1204 and the overlapping signal range 1205 are the second overlapping signal range. The first filter coefficient and the second filter coefficient satisfy the conditions that the overlapping signal range 2204 is less than the overlapping signal range 1204, and the overlapping signal range 2205 is less than the overlapping signal range 1205. Moreover, since the filter coefficient corresponding to the SINC waveform performs frequency domain filtering processing on the pilot signal 2202, data is only on the vertex position of the waveform on the pilot signal 2202, and the remaining data subjected to frequency domain expansion is 0, so it can be seen that the frequency domain range occupied by the pilot signal 2202 is as small as possible, at this time, the overlapping signal range 2204 and the overlapping signal range 2205 also reach the minimum state, the interference of the signal 1201 and the signal 1203 on the pilot signal 2202 is reduced to almost zero, and at this time, more accurate channel estimation can be performed according to the pilot signal which is hardly interfered by the first data signal.

Fig. 2d schematically shows a distribution structure of pilot signals and data signals in time domain and frequency domain according to an embodiment of the present invention, as shown in fig. 2d, a horizontal axis 2301 represents time domain t, a vertical axis 2302 represents frequency domain f, and pilot signals 2305 are randomly dispersed among data signals in the time domain and the frequency domain.

As shown in fig. 2d, the position relationship between the data signal 2303 and the pilot signal 2305 is: in the time domain, the data signal 2303 after the frequency domain filtering process is the same as the time domain symbol occupied by the pilot signal 2305; in the frequency domain, the first data signal 2303 after the frequency domain filtering process is adjacent to the subcarriers occupied by the pilot signal 2305. In fig. 2d, both pilot signal 2305 and data signal 2303 occupy time domain symbol 3 in the time domain; in the frequency domain, a pilot signal 2305 is carried on subcarrier 3, and a data signal 2303 is carried on subcarrier 2, as shown in fig. 2d, where subcarrier 2 is adjacent to subcarrier 3.

As shown in fig. 2d, the position relationship between the data signal 2307 and the pilot signal 2305 is: in the time domain, the data signal 2307 after the frequency domain filtering process is the same as the time domain symbol occupied by the pilot signal 2305; in the frequency domain, the first data signal 2307 after the frequency domain filtering process is adjacent to the subcarriers occupied by the pilot signal 2305. In fig. 2d, both pilot signal 2305 and data signal 2307 occupy time domain symbol 3 in the time domain; in the frequency domain, a pilot signal 2305 is carried on subcarrier 3, and a data signal 2307 is carried on subcarrier 4, as shown in fig. 2d, where subcarrier 4 is adjacent to subcarrier 3.

As shown in fig. 2d, the position relationship between the data signal 2306 and the pilot signal 2305 is: in the time domain, the data signal 2306 after the frequency domain filtering process is adjacent to a time domain symbol occupied by the pilot signal 2305; in the frequency domain, the data signal 2306 after the frequency domain filtering process is the same as the subcarriers occupied by the pilot signal 2305. In fig. 2d, pilot signal 2305 occupies time domain symbol 3, data signal 2306 occupies time domain symbol 2 in time domain, and as shown in fig. 2d, time domain symbol 2 and time domain symbol 3 are adjacent in time domain; in the frequency domain, pilot signal 2305 and data signal 2306 are both carried on subcarrier 3.

As shown in fig. 2d, the position relationship between the data signal 2304 and the pilot signal 2305 is: in the time domain, the data signal 2304 after the frequency domain filtering process is adjacent to a time domain symbol occupied by the pilot signal 2305; in the frequency domain, the data signal 2304 after the frequency domain filtering process is the same as the subcarriers occupied by the pilot signal 2305. In fig. 2d, pilot signal 2305 occupies time domain symbol 3, data signal 2304 occupies time domain symbol 4 in time domain, and as shown in fig. 2d, time domain symbol 4 and time domain symbol 3 are adjacent in time domain; in the frequency domain, pilot signal 2305 and data signal 2304 are both carried on subcarrier 3.

In the embodiment of the present invention, optionally, the first data signal includes a data signal 2303 and a data signal 2307 in fig. 2d, and the first data signal and the pilot signal are respectively subjected to frequency domain filtering processing by using different filter coefficients, so as to reduce interference of the data signal 2303 and the data signal 2307 on the pilot signal 2305.

Optionally, before performing frequency-domain filtering on the first data signal and the pilot signal respectively by using different filter coefficients, the method further includes:

generating a second data signal, wherein the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; performing frequency domain filtering processing on the second data signal; sending the second data signal after the frequency domain filtering processing; in the time domain, the second data signal after being processed by frequency domain filtering is adjacent to a time domain symbol occupied by the pilot signal; and in the frequency domain, the second data signal after the frequency domain filtering processing is the same as the subcarrier occupied by the pilot signal.

Accordingly, optionally, the receiving means receives a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the receiving device discards the second data signal.

As shown in fig. 2d, the second data signal includes a data signal 2306 and a data signal 2304. I.e., the second data signal is transmitted at the location of data signal 2306 and data signal 2304. The invalid data signal that does not need to be parsed may be all zero data, or data known to some specific receiving device, or the like, i.e., invalid data that may be discarded by the receiving device. In the embodiment of the present invention, for invalid data, valid data, that is, some service data in a conventional data transmission process, needs to be analyzed by a receiving device. As shown in fig. 2d, assuming that only one pilot signal, i.e., pilot signal 2305, is included in the region shown in fig. 2d, valid data can be transmitted on data signals other than data signal 2306 and data signal 2304. Since the invalid data is transmitted in the second data signal, the invalid data does not interfere with the pilot signal, or even if the invalid data interferes with the pilot signal, since the invalid data receiving apparatus is known, the receiving apparatus can successfully remove the interference suffered by the pilot signal, thereby improving the accuracy of channel estimation according to the pilot signal.

Optionally, no data signal is transmitted on a time domain symbol adjacent to a time domain symbol occupied by the pilot signal on the subcarrier occupied by the pilot signal. I.e., the second data signal is transmitted at the location of data signal 2306 and data signal 2304. Specifically, in the region shown in fig. 2d, no data signal is transmitted at the position corresponding to the data signal 2306 and the data signal 2304, so that the position corresponding to the data signal 2306 and the data signal 2304 does not interfere with the pilot signal, thereby improving the accuracy of channel estimation based on the pilot signal.

In the embodiment of the present invention, the first data signal includes a data signal 2303 and a data signal 2307. I.e., the first data signal is transmitted at the location of data signal 2303 and data signal 2307. With the above method, as shown in fig. 2d, for the pilot signal 2305, because different filter coefficients are adopted to perform frequency domain filtering operations on the pilot signal 2305 and the data signal 2303, respectively, the interference of the data signal 2303 on the pilot signal 2305 is greatly reduced; because different filter coefficients are adopted to respectively carry out frequency domain filtering operation on the pilot signal 2305 and the data signal 2307, the interference of the data signal 2307 on the pilot signal 2305 is greatly reduced; since invalid data is transmitted or data is not transmitted in the position region corresponding to the data signal 2306, interference of the position region corresponding to the data signal 2306 on the pilot signal 2305 is greatly reduced; since invalid data is transmitted or data is not transmitted in the position region corresponding to the data signal 2304, interference with the pilot signal 2305 by the position region corresponding to the data signal 2304 is greatly reduced. As shown in fig. 2d, the interference of the signals transmitted from the other positions to the pilot signal is small and can be ignored, and by the method provided by the embodiment of the present invention, the pilot signal 2305 hardly receives any interference, so that more accurate channel estimation can be performed according to the pilot signal.

Furthermore, the method provided by the embodiment of the invention not only effectively eliminates the inherent interference of the data signal to the pilot signal symbol, but also enables the pilot signal to have stronger robustness to the channel change, and overcomes the defect of poor channel estimation performance in the scene of faster channel change.

As can be seen from the above, in the embodiment of the present invention, a pilot signal and a first data signal are generated, frequency-domain filtering processing is performed on the first data signal and the pilot signal respectively by using different filter coefficients, and the pilot signal and the first data signal after the frequency-domain filtering processing are sent; and the time domain symbols occupied by the first data signal after the frequency domain filtering processing on the time domain are the same as those occupied by the pilot signal, and the subcarriers occupied by the first data signal after the frequency domain filtering processing on the frequency domain are adjacent to those occupied by the pilot signal. Further, the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range; the first overlapping signal range is a signal range in which overlapping signals exist between the first data signal and the pilot signal if different filter coefficients are used for respectively carrying out frequency domain filtering operation on the first data signal and the pilot signal; the second overlapping signal range is a range of signals in which there is an overlap between the first data signal and the pilot signal if the first data signal and the pilot signal are respectively subjected to frequency domain filtering operations using the same filter coefficients. In this way, since the first data signal and the pilot signal are respectively subjected to frequency domain filtering processing by using different filter coefficients, the range of signals with overlapping between the first data signal and the pilot signal in the frequency domain is reduced, that is, the interference of the first data signal to the pilot signal in the frequency domain is reduced, and the accuracy of channel estimation is improved.

Based on the same concept, fig. 3 exemplarily shows a schematic structural diagram of a transmitting apparatus provided by an embodiment of the present invention.

As shown in fig. 3, an embodiment of the present invention provides a sending apparatus 300, configured to execute the above method flow, where the sending apparatus 300 includes a processing unit 301 and a sending unit 302, where:

a processing unit 301 for generating a pilot signal and a first data signal; respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients;

a transmitting unit 302, configured to transmit the pilot signal and the first data signal after the frequency domain filtering processing; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the conditions for satisfying different filter coefficients are similar to those in the foregoing embodiment of the method, and are not described herein again.

Optionally, the processing unit 301 is specifically configured to: carrying out frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform; the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform.

Optionally, the processing unit 301 is further configured to: generating a second data signal, wherein the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; performing frequency domain filtering processing on the second data signal;

the sending unit 302 is further configured to: sending the second data signal after the frequency domain filtering processing;

Optionally, the sending unit 302 is further configured to: and aiming at the subcarriers occupied by the pilot signals, not sending data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals. Therefore, the time domain symbol adjacent to the time domain symbol occupied by the pilot signal can not cause interference to the pilot signal, and the accuracy of channel estimation according to the pilot signal is improved.

Based on the same concept, fig. 4 exemplarily shows a schematic structural diagram of a receiving apparatus provided by an embodiment of the present invention.

As shown in fig. 4, an embodiment of the present invention provides a receiving apparatus 400, configured to execute the above method flow, where the receiving apparatus 400 includes a receiving unit 401 and a processing unit 402, where:

a receiving unit 401, configured to receive a pilot signal and a first data signal; the first data signal and the pilot signal are obtained by respectively carrying out frequency domain filtering processing by using different filter coefficients; in the time domain, the first data signal after the frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

a processing unit 402, configured to analyze the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal.

The conditions for satisfying the different filter coefficients are similar to those in the foregoing embodiment of the method, and are not described herein again.

Optionally, the receiving unit 401 is further configured to: receiving a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the processing unit 402 is further configured to discard the second data signal.

As can be seen from the above, in the embodiment of the present invention, the time domain symbols occupied by the first data signal after the frequency domain filtering processing in the time domain are the same as the time domain symbols occupied by the pilot signal, and the subcarriers occupied by the first data signal after the frequency domain filtering processing in the frequency domain are adjacent to each other. Further, the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range; the first overlapping signal range is a signal range in which overlapping signals exist between the first data signal and the pilot signal if different filter coefficients are used for respectively carrying out frequency domain filtering operation on the first data signal and the pilot signal; the second overlapping signal range is a range of signals in which there is an overlap between the first data signal and the pilot signal if the first data signal and the pilot signal are respectively subjected to frequency domain filtering operations using the same filter coefficients. In this way, since the first data signal and the pilot signal are respectively subjected to frequency domain filtering processing by using different filter coefficients, the range of signals with overlapping between the first data signal and the pilot signal in the frequency domain is reduced, that is, the interference of the first data signal to the pilot signal in the frequency domain is reduced, and the accuracy of channel estimation is improved.

Based on the same concept, fig. 5 exemplarily shows a schematic structural diagram of a transmitting apparatus provided by an embodiment of the present invention.

As shown in fig. 5, an embodiment of the present invention provides a sending apparatus 500, configured to execute the above method flow, where the sending apparatus 500 includes a processor 501, a memory 502, and a sender 503, where:

a memory 502 for storing programs and instructions;

a transmitter 503 for communicating with a receiving device; specifically, the method is used for transmitting a pilot signal and a first data signal after frequency domain filtering processing;

a processor 501, for executing, by calling the programs and instructions stored in the memory 502: generating a pilot signal and a first data signal; respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients;

the pilot signal and the first data signal after the frequency domain filtering process are transmitted by the transmitter 503; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

Optionally, the processor 501 is specifically configured to: carrying out frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform; the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform.

Optionally, the processor 501 is further configured to: generating a second data signal, wherein the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; performing frequency domain filtering processing on the second data signal;

a transmitter 503, further configured to: sending the second data signal after the frequency domain filtering processing;

Optionally, the transmitter 503 is further configured to: and aiming at the subcarriers occupied by the pilot signals, not sending data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals. Therefore, the time domain symbol adjacent to the time domain symbol occupied by the pilot signal can not cause interference to the pilot signal, and the accuracy of channel estimation according to the pilot signal is improved.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transmitter may be a number of elements providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

Based on the same concept, fig. 6 exemplarily shows a schematic structural diagram of a receiving apparatus provided by an embodiment of the present invention.

As shown in fig. 6, an embodiment of the present invention provides a receiving apparatus 600 for executing the above method flow, where the receiving apparatus 600 includes a processor 601, a memory 602, and a receiver 603, where:

a memory 602 for storing programs and instructions;

a receiver 603 for communicating with a transmitting device; specifically, the method includes receiving a pilot signal and a first data signal transmitted by a transmitting apparatus;

a processor 601, for executing by calling the programs and instructions stored in the memory 602:

receiving a pilot signal and a first data signal by a receiver 603; the first data signal and the pilot signal are obtained by respectively carrying out frequency domain filtering processing by using different filter coefficients; in the time domain, the first data signal after the frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

Optionally, the receiver 603 is further configured to: receiving a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed; in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; in the frequency domain, the second data signal and the pilot signal occupy the same subcarriers. Optionally, the processor 601 is further configured to discard the second data signal.

The bus architecture may include, among other things, any number of interconnected buses and bridges, with one or more processors, represented by a processor, and various circuits of memory, represented by memory, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The receiver may be a number of elements providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of data transmission, comprising:

a transmitting device generates a pilot signal and a first data signal; the first data signal is used for carrying effective data which needs to be analyzed by a receiving device;

the transmitting device uses different filter coefficients to respectively perform frequency domain filtering processing on the first data signal and the pilot signal;

the transmitting device transmits the pilot signal and the first data signal after frequency domain filtering processing; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range;

wherein the first overlapping signal range is a signal range in which an overlapping signal exists between the first data signal and the pilot signal if different filter coefficients are used to perform frequency domain filtering operations on the first data signal and the pilot signal respectively;

the second overlapping signal range is a range of signals in which overlapping exists between the first data signal and the pilot signal if the same filter coefficient is used to perform frequency domain filtering operation on the first data signal and the pilot signal, respectively.

2. The method of claim 1, wherein the transmitting device frequency-domain filters the first data signal and the pilot signal using different filter coefficients, respectively, comprising:

the transmitting device uses the filter coefficient corresponding to the SINC waveform to carry out frequency domain filtering on the pilot signal;

the transmission apparatus frequency-domain filters the first data signal using filter coefficients corresponding to a waveform different from an SINC waveform.

3. The method of claim 2, wherein the SINC waveform corresponds to a filter coefficient of 1.

4. The method of any of claims 1 to 3, wherein the transmitting device, prior to frequency-domain filtering the first data signal and the pilot signal using different filter coefficients, respectively, further comprises:

the sending device generates a second data signal, and the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed;

the transmitting device carries out frequency domain filtering processing on the second data signal;

the transmitting device transmits the second data signal after the frequency domain filtering processing;

in the time domain, the second data signal after the frequency domain filtering process is adjacent to a time domain symbol occupied by the pilot signal; and on the frequency domain, the second data signal after the frequency domain filtering processing is the same as the subcarrier occupied by the pilot signal.

5. The method of any of claims 1 to 3, further comprising:

and aiming at the sub-carriers occupied by the pilot signals, the sending device does not send data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals.

6. A method of data transmission, comprising:

the receiving device receives a pilot signal and a first data signal; wherein the first data signal and the pilot signal are obtained by performing frequency domain filtering processing on the first data signal and the pilot signal respectively by using different filter coefficients; in the time domain, the first data signal after being subjected to frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal; the first data signal is used for carrying effective data which needs to be analyzed by a receiving device;

the receiving device analyzes the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal;

wherein the different filter coefficients satisfy the condition: in the frequency domain, the first overlapping signal range is less than the second overlapping signal range;

7. The method of claim 6, wherein the filter coefficients corresponding to the pilot signal are filter coefficients corresponding to a SINC waveform.

8. The method of claim 7, wherein the SINC waveform corresponds to a filter coefficient of 1.

9. The method of any of claims 6 to 8, further comprising:

the receiving device receives a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed;

in the time domain, the second data signal is adjacent to a time domain symbol occupied by the pilot signal; and on the frequency domain, the second data signal and the pilot signal occupy the same subcarriers.

10. A transmitting apparatus, comprising:

a processing unit for generating a pilot signal and a first data signal; respectively carrying out frequency domain filtering processing on the first data signal and the pilot signal by using different filter coefficients; the first data signal is used for carrying effective data which needs to be analyzed by a receiving device;

a transmitting unit, configured to transmit the pilot signal and the first data signal after frequency domain filtering processing; in the time domain, the first data signal after being subjected to frequency domain filtering treatment and the pilot signal occupy the same time domain symbol; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal;

11. The transmitting device of claim 10, wherein the processing unit is specifically configured to:

performing frequency domain filtering on the pilot signal by using a filter coefficient corresponding to the SINC waveform;

the first data signal is frequency domain filtered using filter coefficients corresponding to a waveform different from the SINC waveform.

12. The transmission apparatus of claim 11, wherein the SINC waveform has a filter coefficient of 1.

13. The transmitting apparatus according to any one of claims 10 to 12, wherein the processing unit is further configured to:

generating a second data signal, wherein the second data signal is an invalid data signal which is received by a receiving device and does not need to be analyzed;

performing frequency domain filtering processing on the second data signal;

the sending unit is further configured to:

transmitting the second data signal after the frequency domain filtering processing;

14. The transmitting apparatus according to any one of claims 10 to 12, wherein the transmitting unit is further configured to:

and aiming at the subcarriers occupied by the pilot signals, not sending data signals on the time domain symbols adjacent to the time domain symbols occupied by the pilot signals.

15. A receiving apparatus, comprising:

a receiving unit for receiving a pilot signal and a first data signal; wherein the first data signal and the pilot signal are obtained by performing frequency domain filtering processing on the first data signal and the pilot signal respectively by using different filter coefficients; in the time domain, the first data signal after being subjected to frequency domain filtering processing is the same as the time domain symbol occupied by the pilot signal; on the frequency domain, the first data signal after the frequency domain filtering processing is adjacent to the sub-carrier occupied by the pilot signal; the first data signal is used for carrying effective data which needs to be analyzed by a receiving device;

a processing unit, configured to analyze the pilot signal and the first data signal according to different filter coefficients corresponding to the pilot signal and the first data signal;

16. The receiving apparatus as claimed in claim 15, wherein the filter coefficients corresponding to the pilot signal are filter coefficients corresponding to a SINC waveform.

17. The receiving apparatus of claim 16, wherein the SINC waveform corresponds to a filter coefficient of 1.

18. The receiving apparatus according to any of claims 15 to 17, wherein the receiving unit is further configured to:

receiving a second data signal; the second data signal is an invalid data signal which is received by the receiving device and does not need to be analyzed;