CN111294181A - Symbol data transmitting and receiving method, storage medium, transmitting end device and receiving end device - Google Patents

Symbol data transmitting and receiving method, storage medium, transmitting end device and receiving end device Download PDF

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CN111294181A
CN111294181A CN201910149775.8A CN201910149775A CN111294181A CN 111294181 A CN111294181 A CN 111294181A CN 201910149775 A CN201910149775 A CN 201910149775A CN 111294181 A CN111294181 A CN 111294181A
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data
symbol data
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CN111294181B (en
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茆晓军
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A method for sending and receiving symbol data, a storage medium, a sending terminal device and a receiving terminal device are provided, the method for sending the symbol data comprises the following steps: for original data corresponding to each symbol data in a baseband, expanding the original data in a time domain from a starting position of a time slot; for each expanded original data, performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in a time slot; taking each original data after cyclic shift as a data part of the corresponding symbol data; for each symbol data, copying data from the tail of the data part of the symbol data according to the length of the cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data; and sending out each symbol data. The technical scheme of the invention can improve the transmission efficiency of the symbol data.

Description

Symbol data transmitting and receiving method, storage medium, transmitting end device and receiving end device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a symbol data transmitting and receiving method, a storage medium, a transmitting end device, and a receiving end device.
Background
In a New Radio (NR) system, for a baseband signal modulated by Orthogonal Frequency Division Multiplexing (OFDM), if carrier frequencies of a transmitting end and a receiving end are not consistent, when the receiving end acquires frequency domain data, a phase difference is fixed compared with the frequency domain data transmitted by the transmitting end, and phase differences of different symbol data (symbols) are different.
Describing an OFDM modulation process of a certain carrier, assuming that a transmitting end needs to carry data a on a carrier k, according to the definition of the NR standard 3gpp38.211 standard document, the carrier is represented in the time domain as:
Figure BDA0001981497970000011
wherein the parameters k, k0、NRB、
Figure BDA0001981497970000012
Δf、NCP,l、TCThe equal parameters are parameters configured by the sending end. Here, the starting point t of t is 0, which is the starting point of each symbol data (symbol). If the frequency points of the sending carrier and the receiving carrier are not consistent, the data at the receiving end may be placed on the carrier k + M, and the waveform of the data at the receiving end is as follows:
Figure BDA0001981497970000013
as with the transmitting end, where the starting point t of t is 0, the starting point of each symbol data. The above are baseband signals; considering the carrier, assuming that the frequency of the transmitting end is ftx and the carrier frequency of the receiving end is frx, the transmitted and received radio frequency signals are respectively:
Figure BDA0001981497970000014
Figure BDA0001981497970000015
wherein: k.DELTA.f+fTX＝(k+M)·Δf+fRXThe starting point of time t' is the starting point of a slot (slot), and Ti is the time domain position of the symbol data. Visible sender andthe signal amplitude and frequency of the receiving end are the phases of the signals of the transmitting end and the receiving end which are consistent, and the phase difference is respectively:
Figure BDA0001981497970000021
Figure BDA0001981497970000022
Figure BDA0001981497970000023
from the above formula, it can be seen that the phase difference sum TiCorrelation, i.e., the phase difference of each symbol data is different. Because the existence of the phase difference causes channel estimation errors when joint channel estimation is performed between symbol data, phase compensation needs to be performed on each symbol data, so that the phase difference of each symbol data is the same, and thus joint channel estimation can be performed between the symbol data.
However, in the prior art, since the transmitting end only knows the carrier frequency of the transmitting end and the receiving end only knows the carrier frequency of the receiving end, phase compensation needs to be performed on each OFDM symbol data at the transmitting end and the receiving end. When the sampling rate of the symbol data is high, the phase compensation requires more computation resources.
Disclosure of Invention
The technical problem solved by the invention is how to improve the transmission efficiency of the symbol data.
In order to solve the above technical problem, an embodiment of the present invention provides a symbol data transmission method, where the symbol data transmission method includes: for original data corresponding to each symbol data in a baseband, expanding the original data in a time domain from a time slot starting position, wherein the original data is a numerical sequence; for each expanded original data, performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data positioned in front of the current symbol data in the same time slot; taking each original data after cyclic shift as a data part of the corresponding symbol data; for each symbol data, copying data from the tail of the data part of the symbol data according to the length of the cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data; symbol data is transmitted, each symbol data including a cyclic prefix and a data portion.
Optionally, the performing, according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the time slot, the backward cyclic shift on the current original data includes: calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the time slot to serve as the shift length of the current original data; and intercepting the data with the length of the shift length from the front part of the current original data, and putting the intercepted data into the tail part of the intercepted current original data to be used as the current original data after cyclic shift.
Optionally, the sending out each symbol data includes: modulating each symbol data with a carrier wave of a sending end; and transmitting the modulated symbol data.
Optionally, the spreading, in the time domain from the start position of the timeslot, the original data corresponding to each symbol data in the baseband includes: for each original data, determining the length after expansion according to the length of the current original data, the current symbol data corresponding to the current original data and the lengths of all symbol data of the current symbol data before the same time slot; and expanding the current original data according to the expanded length, wherein the expanded length of the current original data is more than or equal to the expanded length.
In order to solve the above technical problem, an embodiment of the present invention further discloses a symbol data receiving method, where the symbol data receiving method includes: receiving each symbol data sent by sending end equipment, wherein each symbol data comprises a cyclic prefix and a data part; removing the cyclic prefix of each symbol data to obtain a data part of each symbol data; for each data part of the symbol data, performing forward cyclic shift on the current data part according to the length of the cyclic prefix of the current symbol data corresponding to the current data part and the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the same time slot; and taking each cyclic shifted data part as corresponding original data of the corresponding symbol data in the baseband.
Optionally, the performing forward cyclic shift on the current data portion according to the length of the cyclic prefix of the current symbol data corresponding to the current data portion and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the timeslot includes: calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the time slot as the shift length of the current data portion; and intercepting the data with the length of the shift length from the rear part of the current data part, and putting the intercepted data in the front part of the intercepted current data part to be used as the current data part after cyclic shift.
Optionally, after receiving each symbol data sent by the sending end device, the method further includes: and demodulating each received symbol data and a receiving end carrier to obtain each demodulated symbol data.
The embodiment of the invention also discloses a symbol data sending device, which comprises: the device comprises an expansion module, a time division module and a data processing module, wherein the expansion module is suitable for expanding original data corresponding to each symbol data in a baseband on a time domain from a time slot starting position, and the original data is a numerical sequence; a backward cyclic shift module adapted to perform backward cyclic shift on each expanded original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the same time slot; a data portion determining module adapted to take each cyclically shifted original data as a data portion of its corresponding symbol data; a cyclic prefix determination module adapted to, for each symbol data, copy data from a tail of a data portion of the symbol data by a length of a cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data; and a transmitting module adapted to transmit symbol data, each symbol data comprising a cyclic prefix and a data portion.
The embodiment of the invention also discloses a symbol data receiving device, which comprises: the receiving module is suitable for receiving each symbol data sent by the sending terminal equipment, and each symbol data comprises a cyclic prefix and a data part; a cyclic prefix removal module adapted to remove a cyclic prefix of each symbol data to obtain a data portion of each symbol data; a forward cyclic shift module, adapted to perform forward cyclic shift on a data portion of each symbol data according to a length of a cyclic prefix of current symbol data corresponding to the current data portion and lengths of cyclic prefixes of all symbol data located before the current symbol data in a same slot; and the original data determining module is suitable for taking each cyclic shifted data part as corresponding original data of the corresponding symbol data in the baseband.
The embodiment of the invention also discloses a storage medium, wherein computer instructions are stored on the storage medium, and when the computer instructions are operated, the steps of the symbol data sending method or the steps of the symbol data receiving method are executed.
The embodiment of the invention also discloses sending end equipment, which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the processor executes the step of the symbol data sending method when running the computer instruction.
The embodiment of the invention also discloses a receiving end device, which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the processor executes the steps of the symbol data receiving method when running the computer instruction.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the technical scheme of the invention is that the original data corresponding to each symbol data in the baseband is expanded on a time domain from the initial position of a time slot, and the original data is a numerical sequence; for each expanded original data, performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the time slot; taking each original data after cyclic shift as a data part of the corresponding symbol data; for each symbol data, copying data from the tail of the data part of the symbol data according to the length of the cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data; symbol data is transmitted, each symbol data including a cyclic prefix and a data portion. In the technical scheme of the invention, for the original data to be sent, the time domain is expanded from the initial position of the time slot, namely the initial position of the time slot is used as the initial time for modulating each symbol data, the backward cyclic shift is carried out on the original data, namely the data positioned at the head of the original data is moved to the tail of the original data, so that the phase difference between the symbol data caused by the difference of modulated carriers of a sending end and a receiving end can be avoided on the basis of ensuring that the data are correctly sent and received, further, the sending end and the receiving end are prevented from respectively carrying out phase compensation on the symbol data, the operation complexity of sending and receiving the symbol data is reduced, and the sending and receiving efficiency of the symbol sending data can be reduced.
Further, calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the time slot as the shift length of the current original data; and intercepting the data with the length of the shift length from the front part of the current original data, and putting the intercepted data into the tail part of the intercepted current original data to be used as the current original data after cyclic shift. In the technical scheme of the invention, the shift length of each original data needing to be shifted is determined according to the cyclic prefix of each symbol in the time slot, so that the convenience of symbol data processing is ensured on the basis of realizing the transmission of the symbol data, and the operation complexity of transmitting and receiving the symbol data is further reduced.
Further, for each original data, determining an extended length according to the length of the current original data, the current symbol data corresponding to the current original data, and the lengths of all symbol data of the current symbol data before the same time slot; and expanding the current original data according to the expanded length, wherein the expanded length of the current original data is more than or equal to the expanded length. In the technical scheme of the invention, because each symbol data has a fixed starting position and a fixed ending position in the time slot, in order to avoid unnecessary extension operation, the extended length of each symbol data can be determined according to the length and the mutual position of each symbol data in the time slot, and the operation complexity of transmitting and receiving the symbol data is further reduced.
Drawings
Fig. 1 is a flowchart of a symbol data transmission method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an exemplary application scenario of the present invention;
FIG. 3 is a diagram illustrating another exemplary application scenario of an embodiment of the present invention;
fig. 4 is a flowchart of a symbol data receiving method according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating another exemplary application scenario of an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a symbol data transmitting apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a symbol data receiving device according to an embodiment of the present invention.
Detailed Description
For the phase compensation method in the prior artThe following relationships are mainly used: k.DELTA.f+fTX＝(k+M)·Δf+fRXWhereinΔfIs the subcarrier spacing, k is the number of subcarriers, and M is the carrier offset. Combining the phase difference term of each symbol data:
Figure BDA0001981497970000061
respectively compensating at a sending end and a receiving end:
Figure BDA0001981497970000062
Figure BDA0001981497970000063
Figure BDA0001981497970000064
wherein the content of the first and second substances,
Figure BDA0001981497970000065
the phase is compensated for at the transmitting end,
Figure BDA0001981497970000066
the phase is compensated for at the receiving end.
As described in the background art, in the prior art, since the transmitting end only knows the carrier frequency of the transmitting end and the receiving end only knows the carrier frequency of the receiving end, phase compensation needs to be performed on each OFDM symbol data at the transmitting end and the receiving end. When the sampling rate of the symbol data is high, the phase compensation requires more computation resources.
In the embodiment of the invention, for the original data to be sent, the time domain is expanded from the initial position of the time slot, that is, the initial position of the time slot is used as the initial time for modulating each symbol data, and the backward cyclic shift is performed on the original data, that is, the data at the head of the original data is moved to the tail of the original data, so that the phase difference between the symbol data caused by the difference of modulated carriers of the sending end and the receiving end can be avoided on the basis of ensuring that the data is correctly sent and received, further, the sending end and the receiving end are prevented from respectively performing phase compensation on the symbol data, the operation complexity of sending and receiving the symbol data is reduced, and the sending and receiving efficiency of the symbol sending data can be reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a method for transmitting symbol data according to an embodiment of the present invention.
The symbol data transmission method shown in fig. 1 may include the steps of:
step S101: for original data corresponding to each symbol data in a baseband, expanding the original data in a time domain from a time slot starting position, wherein the original data is a numerical sequence;
step S102: for each expanded original data, performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data positioned in front of the current symbol data in the same time slot;
step S103: taking each original data after cyclic shift as a data part of the corresponding symbol data;
step S104: for each symbol data, copying data from the tail of the data part of the symbol data according to the length of the cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data;
step S105: symbol data is transmitted, each symbol data including a cyclic prefix and a data portion.
It should be noted that the sequence numbers of the steps in this embodiment do not represent a limitation on the execution sequence of the steps.
The symbol data transmission method of this embodiment may be used in a data transmission device, for example, a user equipment or a base station.
In a specific implementation, the raw data may be a discrete number sequence obtained by sampling a continuous signal. Specifically, the sampling rate for sampling the continuous signal may be set by a user according to an actual application scenario, which is not limited in this embodiment of the present invention.
In this embodiment, the start time of the baseband modulation for the original data is the start position of the time slot.
In a specific implementation of step S101, the original data corresponding to the symbol data may be expanded in the time domain from the start position of the slot where each symbol data is located. The expansion of the original data in this embodiment refers to continuous copying of the original data in the time domain.
Referring to fig. 2, the position indicated by reference character a is the slot start position. Reference numeral 10 denotes an expansion result after expanding the original data 0, the original data 0 corresponding to the symbol data 0; reference numeral 20 denotes an expansion result after the original data 1 is expanded, the original data 1 corresponding to the symbol data 1; similarly, reference numeral 30 denotes an expansion result obtained by expanding the original data 2, and the original data 20 corresponds to the symbol data 2.
In order to ensure the accuracy of sending each symbol data, that is, to ensure that the symbol data can be correctly received by the receiving end, in the specific implementation of step S102, a backward cyclic shift operation may be performed on each original data after being extended.
In this embodiment, the backward cyclic shift operation refers to moving the value located at the front of the original data to the tail of the original data. For example, the raw data is { d }0，d1，d2，…，dM-1Selecting the sequence with the front length s in the sequence to move to the tail, and taking the original data after cyclic shift as { d }s，ds+1，ds+2，…，dM-1,d0，d1，d2,…,ds-1}。
In this embodiment, the symbol data may include a Cyclic Prefix (CP) and a data portion (data). The data portion of each symbol data can be determined by step S102. Further, in step S103, each of the circularly shifted original data may be used as a data portion of its corresponding symbol data.
In a specific implementation of step S104, a cyclic prefix for each symbol data may be determined. Specifically, data may be copied from the end of the data portion of the symbol data according to the length of the cyclic prefix of the symbol data, so as to serve as the cyclic prefix of the symbol data.
It should be noted that the length of the cyclic prefix of each symbol data may be configured in advance, and the embodiment of the present invention does not limit this. For example, as shown in table 1 below, the cyclic prefix length of symbol 0 is 160 (unit is 1/Rs, Rs is the sampling rate), and the data portion length of symbol 0 is 2048; the cyclic prefix length of symbol 1 is 144 and the data portion length of symbol 0 is 2048; by analogy, the cyclic prefix length of symbol 2 is 144, and the data portion length of symbol 0 is 2048, which is not described herein again.
TABLE 1
Symbol mark 0 1 2 3 4 5 6
Cyclic prefix 160 144 144 144 144 144 144
Data part 2048 2048 2048 2048 2048 2048 2048
In an implementation of step S105, each symbol data may be transmitted.
In the embodiment of the invention, for the original data to be sent, the time domain is expanded from the initial position of the time slot, that is, the initial position of the time slot is used as the initial time for modulating each symbol data, and the backward cyclic shift is performed on the original data, that is, the data at the head of the original data is moved to the tail of the original data, so that the phase difference between the symbol data caused by the difference of modulated carriers of the sending end and the receiving end can be avoided on the basis of ensuring that the data is correctly sent and received, further, the sending end and the receiving end are prevented from respectively performing phase compensation on the symbol data, the operation complexity of sending and receiving the symbol data is reduced, and the sending and receiving efficiency of the symbol sending data can be reduced.
In a specific example, the start position of the time slot is used as the start point of the original data spreading, that is, the start position of the time slot is used as the start time of each symbol data modulation, in this case, the phase difference between the transmitting end and the receiving end is:
Figure BDA0001981497970000091
wherein t 'is a time slot duration, and t' is a time slot starting time; k is a carrier number; k0 is carrier offset, which is a system parameter; n is a radical ofRBIs the transmission bandwidth;
Figure BDA0001981497970000092
the number of subcarriers contained in a single Resource Block (RB); m is the subcarrier deviation of the received and transmitted baseband signals; deltafIs the subcarrier spacing, fTXFor the transmitting end carrier, fRXIs the receiving end carrier.
Because of k.DELTAf+fTX＝(k+M)·Δf+fRX(ii) a Therefore, it is not only easy to use
Figure BDA0001981497970000093
That is, there is no phase difference between the signal sent by the sending end and the signal received by the receiving end.
In one non-limiting embodiment of the present invention, step S102 shown in fig. 1 may include the following steps: calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the time slot to serve as the shift length of the current original data; and intercepting the data with the length of the shift length from the front part of the current original data, and putting the intercepted data into the tail part of the intercepted current original data to be used as the current original data after cyclic shift.
In this embodiment, for the current original data, the length of the data that needs to be subjected to backward cyclic shift is: a sum of a length of a cyclic prefix of a current symbol data and lengths of cyclic prefixes of all symbol data located before the current symbol data within the slot.
For example, referring to table 1 and fig. 3 together, symbol data (symbol)0, symbol data 1, symbol data 2, symbol data 3, symbol data 4, symbol data 5, and symbol data 6 are in the same slot. For symbol data 0, which has no symbol data before it is in the slot, the original data corresponding to symbol 0 is shifted by the length 160 of the cyclic prefix of symbol 0. For symbol data 1, which has symbol 0 before it in the slot, the shift length of the original data corresponding to symbol data 1 is the sum of the length of the cyclic prefix of symbol data 0 and the length of the cyclic prefix of symbol data 1, i.e. 160+ 144. Similarly, for symbol data 2, the shift length of the original data corresponding to symbol data 2 is 160+144+ 144.
Specifically, referring to fig. 3, for the original data corresponding to the symbol data 1, a sequence with a shift length of 160+144 is selected at the front and moved to the end of the original data to obtain the data portion of the symbol data 1.
In one non-limiting embodiment of the present invention, step S105 shown in fig. 1 may include the following steps: modulating each symbol data with a carrier wave of a sending end; and transmitting the modulated symbol data.
In this embodiment, after obtaining each symbol data, the symbol data may be modulated with a carrier of a transmitting end, and the modulated symbol data may be transmitted. The process of performing the transmitting-end carrier modulation on the symbol data may be a process of band modulation.
For example, for data a to be transmitted, the baseband time domain signal after baseband modulation is:
Figure BDA0001981497970000111
the data after radio frequency modulation is:
Figure BDA0001981497970000112
wherein t 'is a time slot duration, and t' is a time slot starting time; k is a carrier number; k0 is carrier offset, which is a system parameter; n is a radical ofRBIs the transmission bandwidth;
Figure BDA0001981497970000113
for containing a single Resource Block (RB)The number of subcarriers of (a); m is the subcarrier deviation of the received and transmitted baseband signals; deltafIs the subcarrier spacing.
In one non-limiting embodiment of the present invention, step S101 shown in fig. 1 may include the following steps: for each original data, determining the length after expansion according to the length of the current original data, the current symbol data corresponding to the current original data and the lengths of all symbol data of the current symbol data before the same time slot; and expanding the current original data according to the expanded length, wherein the expanded length of the current original data is more than or equal to the expanded length.
In the embodiment of the invention, because each symbol data has a fixed starting position and a fixed ending position in the time slot, in order to avoid unnecessary extension operation, the extended length of each symbol data can be determined according to the length of each symbol data in the time slot and the mutual position, and the operation complexity of transmitting and receiving the symbol data is further reduced.
Specifically, referring to fig. 2 and table 1, symbol data 0 corresponds to original data 0, symbol data 1 corresponds to original data 1, and symbol data 2 corresponds to original data 2. The length of the original data 0 is 2048 (unit is 1/Rs, Rs is sampling rate), the length of the symbolic data 0 is 160+2048, and the extended length of the extended original data 0 is greater than 160+2048, so the original data 0 is extended twice. Similarly, the length of the original data 1 is 2048, the length of the symbol data 0 is 160+2048, the length of the symbol data 1 is 144+2048, and the extended length of the original data 1 is greater than 160+2048+144+2048, so that the original data 1 is extended three times.
Referring to fig. 4, an embodiment of the present invention further discloses a symbol data receiving method. The symbol data receiving method may include the steps of:
step S401: receiving each symbol data sent by sending end equipment, wherein each symbol data comprises a cyclic prefix and a data part;
step S402: removing the cyclic prefix of each symbol data to obtain a data part of each symbol data;
step S403: for each data part of the symbol data, performing forward cyclic shift on the current data part according to the length of the cyclic prefix of the current symbol data corresponding to the current data part and the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the same time slot;
step S404: and taking each cyclic shifted data part as corresponding original data of the corresponding symbol data in the baseband.
The symbol data receiving method of this embodiment may be used for a data receiving device, for example, a user equipment or a base station.
In this embodiment, the forward cyclic shift operation refers to moving a value at the tail of the original data to the front of the original data. For example, after the cyclic prefix is removed from the symbol data, the data portion is { e }0，e1，e，…，eM-1Selecting the sequence with the tail length s in the sequence to move to the front part, and the data part after forward cyclic shift, namely the original data is { e }M-s，eM-s+1，…，eM-1,e0，e1，e2,…,eM-s-1}。
In one non-limiting embodiment of the present invention, step S403 shown in fig. 4 may include the following steps: calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the time slot as the shift length of the current data portion; and intercepting the data with the length of the shift length from the rear part of the current data part, and putting the intercepted data in the front part of the intercepted current data part to be used as the current data part after cyclic shift.
The symbol data received at the receiving end includes a cyclic prefix and a data portion. The receiving end removes the cyclic prefix of each symbol data according to the length of the cyclic prefix of each symbol data, specifically, selects data which is located in front of the symbol data and has a length equal to the length of the cyclic prefix of the symbol data, and removes the data.
The data portion before the forward cyclic shift shown in fig. 5 is symbol data after the cyclic prefix is removed. Since the transmitting end performs backward cyclic shift in determining the data part, the transmitting end may perform forward cyclic shift on the data part to restore the original data.
Referring to fig. 5 and table 1, for symbol data 1, symbol 0 exists before the slot, and the shift length of the original data corresponding to symbol data 1 is the sum of the length of the cyclic prefix of symbol data 0 and the length of the cyclic prefix of symbol data 1, that is, 160+ 144.
For the data portion corresponding to the symbol data 1, a sequence with a shift length of 160+144 is selected at the tail and moved to the head of the original data to obtain the original data corresponding to the symbol data 1.
In one non-limiting embodiment of the invention, step S401 shown in fig. 4 may include the following steps: and demodulating each received symbol data and a receiving end carrier to obtain each demodulated symbol data.
As described above, the transmitting end may transmit symbol data after carrier modulation by the transmitting end. After receiving the modulated symbol data, the receiving end may demodulate each received symbol data and the carrier of the receiving end to recover the data before demodulation.
Referring to fig. 6, an embodiment of the present invention further discloses a symbol data transmitting apparatus 60. The symbol data transmission apparatus 60 may be used for a transmitting-end device. The symbol data transmitting apparatus 60 may include: an extension module 601, a backward cyclic shift module 602, a data portion determination module 603, a cyclic prefix determination module 604, and a sending module 605.
The spreading module 601 is adapted to spread, in a time domain, original data corresponding to each symbol data in a baseband, starting from a starting position of a time slot, where the original data is a sequence of values; the backward cyclic shift module 602 is adapted to, for each expanded original data, perform backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the same timeslot; the data portion determining module 603 is adapted to take each cyclically shifted original data as the data portion of its corresponding symbol data; the cyclic prefix determination module 604 is adapted to, for each symbol data, copy data from a tail of a data portion of the symbol data by a length of a cyclic prefix of the symbol data as the cyclic prefix of the symbol data; the transmitting module 605 is adapted to transmit symbol data, each symbol data comprising a cyclic prefix and a data portion.
For more details of the operation principle and the operation mode of the same-symbol data transmitting apparatus 60, reference may be made to the description in fig. 1 to fig. 5, which is not repeated here.
Referring to fig. 7, an embodiment of the present invention further discloses a symbol data receiving apparatus 70. The symbol data receiving apparatus 70 may be used for a receiving end device. The symbol data receiving apparatus 70 may include a receiving module 701, a cyclic prefix removing module 702, a forward cyclic shift module 703, and a raw data determining module 704.
The receiving module 701 is adapted to receive symbol data sent by a sending end device, where each symbol data includes a cyclic prefix and a data portion; the cyclic prefix removal module 702 is adapted to remove the cyclic prefix of each symbol data to obtain a data portion of each symbol data; the forward cyclic shift module 703 is adapted to perform forward cyclic shift on a data portion of each symbol data according to a length of a cyclic prefix of current symbol data corresponding to the current data portion and lengths of cyclic prefixes of all symbol data located before the current symbol data in the timeslot; the raw data determining module 704 is adapted to take each cyclically shifted data portion as corresponding raw data of its corresponding symbol data in baseband.
For more details of the operation principle and the operation mode of the symbol data receiving device 70, reference may be made to the related descriptions in fig. 1 to 5, which are not described herein again.
The embodiment of the invention also discloses a storage medium, wherein computer instructions are stored on the storage medium, and when the computer instructions are operated, the steps of the method shown in the figure 1 or the figure 4 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile memory (non-volatile) or a non-transitory memory (non-transient), and the like.
The embodiment of the invention also discloses the sending end equipment, which can comprise a memory and a processor, wherein the memory stores computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 1. The sending end device includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal devices, or a base station and a core network side device.
The embodiment of the invention also discloses a receiving end device, which can comprise a memory and a processor, wherein the memory stores computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the method shown in fig. 4. The receiving end device includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal devices, or a base station and a core network side device.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (12)

1. A symbol data transmission method, comprising:
for original data corresponding to each symbol data in a baseband, expanding the original data in a time domain from a time slot starting position, wherein the original data is a numerical sequence;
for each expanded original data, performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data positioned in front of the current symbol data in the same time slot;
taking each original data after cyclic shift as a data part of the corresponding symbol data;
for each symbol data, copying data from the tail of the data part of the symbol data according to the length of the cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data;
symbol data is transmitted, each symbol data including a cyclic prefix and a data portion.
2. The method for transmitting symbol data according to claim 1, wherein the performing backward cyclic shift on the current original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the timeslot comprises:
calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the time slot to serve as the shift length of the current original data;
and intercepting the data with the length of the shift length from the front part of the current original data, and putting the intercepted data into the tail part of the intercepted current original data to be used as the current original data after cyclic shift.
3. The method for transmitting symbol data according to claim 1, wherein said transmitting each symbol data comprises:
modulating each symbol data with a carrier wave of a sending end;
and transmitting the modulated symbol data.
4. The method for transmitting symbol data according to claim 1, wherein the spreading in the time domain from the start position of the slot for the original data corresponding to each symbol data in the baseband comprises:
for each original data, determining the length after expansion according to the length of the current original data, the current symbol data corresponding to the current original data and the lengths of all symbol data of the current symbol data before the same time slot;
and expanding the current original data according to the expanded length, wherein the expanded length of the current original data is more than or equal to the expanded length.
5. A symbol data receiving method, comprising:
receiving each symbol data sent by sending end equipment, wherein each symbol data comprises a cyclic prefix and a data part;
removing the cyclic prefix of each symbol data to obtain a data part of each symbol data;
for each data part of the symbol data, performing forward cyclic shift on the current data part according to the length of the cyclic prefix of the current symbol data corresponding to the current data part and the lengths of the cyclic prefixes of all symbol data positioned before the current symbol data in the same time slot;
and taking each cyclic shifted data part as corresponding original data of the corresponding symbol data in the baseband.
6. The method for receiving symbol data according to claim 5, wherein said performing forward cyclic shift on the current data portion according to the length of the cyclic prefix of the current symbol data corresponding to the current data portion and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the slot comprises:
calculating the length of the cyclic prefix of the current symbol data and the sum of the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the time slot as the shift length of the current data portion;
and intercepting the data with the length of the shift length from the rear part of the current data part, and putting the intercepted data in the front part of the intercepted current data part to be used as the current data part after cyclic shift.
7. The method for receiving symbol data according to claim 5, wherein the receiving each symbol data sent by the sending end device further comprises:
and demodulating each received symbol data and a receiving end carrier to obtain each demodulated symbol data.
8. A symbol data transmission apparatus, comprising:
the device comprises an expansion module, a time division module and a data processing module, wherein the expansion module is suitable for expanding original data corresponding to each symbol data in a baseband on a time domain from a time slot starting position, and the original data is a numerical sequence;
a backward cyclic shift module adapted to perform backward cyclic shift on each expanded original data according to the length of the cyclic prefix of the current symbol data corresponding to the current original data and the lengths of the cyclic prefixes of all symbol data located before the current symbol data in the same time slot;
a data portion determining module adapted to take each cyclically shifted original data as a data portion of its corresponding symbol data;
a cyclic prefix determination module adapted to, for each symbol data, copy data from a tail of a data portion of the symbol data by a length of a cyclic prefix of the symbol data to serve as the cyclic prefix of the symbol data;
and a transmitting module adapted to transmit symbol data, each symbol data comprising a cyclic prefix and a data portion.
9. A symbol data receiving apparatus, comprising:
the receiving module is suitable for receiving each symbol data sent by the sending terminal equipment, and each symbol data comprises a cyclic prefix and a data part;
a cyclic prefix removal module adapted to remove a cyclic prefix of each symbol data to obtain a data portion of each symbol data;
a forward cyclic shift module, adapted to perform forward cyclic shift on a data portion of each symbol data according to a length of a cyclic prefix of current symbol data corresponding to the current data portion and lengths of cyclic prefixes of all symbol data located before the current symbol data in a same slot;
and the original data determining module is suitable for taking each cyclic shifted data part as corresponding original data of the corresponding symbol data in the baseband.
10. A storage medium having stored thereon computer instructions which, when executed, perform the steps of a method for transmitting symbol data according to any one of claims 1 to 4 or a method for receiving symbol data according to any one of claims 5 to 7.
11. A transmitting end device comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the symbol data transmission method according to any one of claims 1 to 4.
12. A receiving-end apparatus comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the symbol data receiving method according to any one of claims 5 to 7.
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