CN110868280A - Data sending method, data receiving method and device - Google Patents
Data sending method, data receiving method and device Download PDFInfo
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- CN110868280A CN110868280A CN201810993844.9A CN201810993844A CN110868280A CN 110868280 A CN110868280 A CN 110868280A CN 201810993844 A CN201810993844 A CN 201810993844A CN 110868280 A CN110868280 A CN 110868280A
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Abstract
Provided is a data transmission method, including: acquiring an effective frequency spectrum on a frequency band; acquiring configuration information of subcarrier grouping; generating a random sequence; generating a basic modulation waveform according to the effective frequency spectrum, the subcarrier grouping and the random sequence; performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and transmitting the modulated bit sequence. The invention introduces the subcarrier grouping on the basis of the existing AJSS system, thereby introducing the frequency domain orthogonality on the basis of the sequence orthogonality, solving the problem of orthogonality damage of the existing AJSS system when the number of users is large, and improving the performance of the AJSS system.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a data transmission method, a data reception method, a transmitter, a receiver, and a corresponding computer-readable storage medium, which can be used for spectrum sharing.
Background
With the rapid development of wireless communication services, more and more wireless spectrum resources are required, and the problem of spectrum resource shortage is increasingly serious. However, actual measurement data shows that the spectrum of most frequency bands is not fully used. Some bands are not used by any user for most of the time, and some bands are very competitive in use. An Anti-Jamming Spectrum Sharing (AJSS) system provides a new idea for improving the Spectrum efficiency to the maximum extent.
In the existing AJSS system, the increase of the number of users makes the interference between users more serious, and destroys the orthogonality of different codewords used between users, thereby affecting the access capability.
Disclosure of Invention
Aiming at the problems, the invention provides an AJSS multiple access scheme based on subcarrier grouping, which introduces a carrier grouping mode among users and increases the orthogonality among the users through frequency division on the basis of code division, thereby effectively improving the multiple access capability on the premise of keeping the advantages of the AJSS system.
According to a first aspect of the present invention, there is provided a data transmission method, including: acquiring an effective frequency spectrum on a frequency band; acquiring configuration information of subcarrier grouping; generating a random sequence; generating a basic modulation waveform according to the effective frequency spectrum, the subcarrier grouping and the random sequence; performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and transmitting the modulated bit sequence. For example, the data processing method may be generally performed on the user equipment side.
In one embodiment, obtaining the configuration information of the subcarrier grouping may include: and receiving configuration information, wherein the configuration information comprises configuration information of subcarrier grouping, random sequence generation configuration information and modulation order of the cyclic code shift keying CCSK.
In one embodiment, obtaining the subcarrier grouping may include: selecting the grouping of subcarriers from a grouping set of subcarriers, wherein at least a portion of the grouping of subcarriers of the grouping set of subcarriers do not overlap.
In one embodiment, the cyclic shift modulation may be cyclic code shift keying CCSK modulation, and the cyclic shift modulating the base modulation waveform according to a bit sequence to be transmitted may further include: and according to the total number N of subcarriers and the modulation order of the CCSK modulation, performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted.
In an embodiment, performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted according to the total number N of subcarriers and a modulation order of the CCSK modulation may include:
when the modulation order is the maximum cyclic shift number S which can be used, determining the bit number which can be transmitted by a single basic modulation waveform according to the maximum cyclic shift number S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Or
When the modulation order is adjacent cyclic shift interval deltasAccording to the cyclic shift interval deltasAnd the total subcarrier number N determines the maximum cyclic shift number S which can be used, and the bit number which can be carried by a single basic modulation waveform is determined according to the maximum cyclic shift number S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the basic modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval is deltas(ii) a Or
When the modulation order is the bit number B which can be carried by a single modulation waveform, determining the cyclic shift interval delta according to the total subcarrier number N and the bit number B which can be carried by the single modulation waveformsGrouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Where S is the maximum number of cyclic shifts, S-2B。
In one embodiment, acquiring the configuration information of the subcarrier packet may include acquiring the configuration information of the subcarrier packet through system information or downlink control information or higher layer signaling.
In one embodiment, the configuration information of the subcarrier grouping may include any one or more of: all possible subcarrier grouping modes and indexes of subcarrier grouping, subcarrier grouping sequences indicating subcarrier grouping modes, and grouping information including subcarrier grouping number and/or subcarrier number in each grouping.
In one embodiment, the random sequence generation configuration information may include any one or more of: generating information or generating sequence information of the pseudo-random sequence; base sequence and/or initial cyclic shift information of the ZC sequence; initial state information generated by the pseudo-random bit sequence and phase mapping rule information.
In one embodiment, the CCSK modulation order comprises any one or more of: maximum number of cyclic shifts S that can be used, adjacent cyclic shift interval ΔsOr the number of bits B that a single modulation waveform can carry.
According to a second aspect of the present invention, there is provided a data receiving method comprising: acquiring an effective frequency spectrum on a frequency band; extracting branch signals corresponding to the subcarrier packets based on the effective spectrum and the subcarrier packets; and extracting data from the branch signals according to the random sequence and demodulating. For example, the data receiving method may be generally performed on the base station side.
According to a third method of the present invention, there is also provided a data receiving method, including: sending configuration information to user equipment, wherein the configuration information comprises configuration information of subcarrier grouping, random sequence generation configuration information and a modulation order of a Cyclic Code Shift Keying (CCSK); and receiving a bit sequence sent by the user equipment, wherein the bit sequence is obtained by the user equipment after performing cyclic shift modulation on a basic modulation waveform according to the bit sequence to be sent, and the basic modulation waveform is generated according to an effective frequency spectrum, a subcarrier group and a random sequence on a frequency band. For example, the method for spectrum sharing may be generally performed at the base station side.
According to a fourth aspect of the present invention, there is also provided a transmitter comprising: an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band; a subcarrier grouping acquisition unit configured to acquire configuration information of a subcarrier grouping; a random sequence generation unit configured to generate a random sequence; a basic modulation waveform generation unit configured to generate a basic modulation waveform from the effective spectrum, the subcarrier group, and the random sequence; a modulation unit configured to perform cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and a transmitting unit configured to transmit the modulated bit sequence. The transmitter may be implemented in a user equipment in general, for example.
According to a fifth aspect of the present invention, there is also provided a receiver comprising: an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band; a tributary signal extraction unit configured to extract tributary signals corresponding to the subcarrier packets based on the effective spectrum and the subcarrier packets; and an extraction unit configured to extract data from the branch signal according to a random sequence and demodulate. The receiver may be implemented in a base station, for example.
According to a sixth aspect of the present invention, there is also provided a receiver comprising: a configuration information sending unit configured to send configuration information to the user equipment, the configuration information including configuration information of subcarrier grouping, random sequence generation configuration information, and a modulation order of Cyclic Code Shift Keying (CCSK); and a receiving unit, configured to receive a bit sequence transmitted by a user equipment, where the bit sequence is obtained after the user equipment performs cyclic shift modulation on a basic modulation waveform according to the bit sequence to be transmitted, and the basic modulation waveform is generated according to an effective spectrum on a frequency band, a subcarrier group, and a random sequence. The receiver may be implemented in a base station, for example.
According to a seventh aspect of the present invention, there is also provided a computer-readable storage medium comprising instructions which, when executed by a processor, cause the processor to perform the method as described in the first to third aspects above.
The invention introduces the subcarrier grouping on the basis of the existing AJSS system, thereby introducing the frequency domain orthogonality on the basis of the sequence orthogonality, solving the problem of orthogonality damage of the existing AJSS system when the number of users is large, and improving the performance of the AJSS system. In addition, the technical scheme provided by the invention is suitable for various application scenes, such as licensed-assisted access (licensed-assisted access) in 4G/5G, a spectrum sharing system and the like.
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The above and other objects and features will become apparent from the following description with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout the various views, and in which:
FIG. 1 shows a schematic diagram of a multi-user AJSS system transmitter;
fig. 2 shows a schematic diagram of a receiver structure of a multi-user AJSS system;
fig. 3 illustrates a flowchart of a subcarrier grouping based signal generation method according to an embodiment of the present invention;
figure 4 shows a schematic diagram of a multi-user AJSS system subcarrier allocation in accordance with an embodiment of the present invention;
FIGS. 5A and 5B are schematic diagrams illustrating a multi-user AJSS system transmitter according to an embodiment of the present invention;
fig. 6A and 6B show schematic diagrams of a multi-user AJSS system receiver structure according to an embodiment of the present invention;
fig. 7 illustrates a flowchart of a data transmission method according to an embodiment of the present invention;
fig. 8 shows a flow chart of a data receiving method according to an embodiment of the invention; and
fig. 9 shows a flow chart of a data receiving method according to an embodiment of the present invention.
Detailed Description
The block diagrams of the transmitter and the receiver of the traditional multi-user AJSS system are respectively shown in FIGS. 1 and 2.
Fig. 1 shows a schematic diagram of a multi-user AJSS system transmitter (e.g., user device) architecture. The transmitter mainly comprises a spectrum sensing and judging module, a pseudorandom polynomial sequence generating module, an inverse Fourier transform module and a Cyclic Code Shift Keying (CCSK) modulating module. In the transmitter, a spectrum sensing and judging module is used for monitoring and judging available spectrum of the spectrum to obtain effective spectrum; the pseudo-random sequence module is used to generate sequences with good orthogonality for distinguishing different users (e.g., user 1 to user k) at the base station side. The generated pseudo-random sequence may use a sequence with good orthogonality, such as a Discrete Fourier Transform (DFT) sequence, or a sequence with cyclic orthogonality properties, such as an M sequence, or a Zadoff-chu (zc) sequence. It should be noted that different users distinguish between users by using different pseudo-random sequences; the inverse Fourier transform module is used for transforming the pseudo-random sequence considering the effective frequency spectrum from a frequency domain to a time domain; and the CCSK modulation module can modulate the signal which is subjected to the inverse Fourier transform by adopting a cyclic shift mode. Finally, the transmitter transmits the CCSK modulated signal via a transmitting antenna.
Fig. 2 shows a schematic diagram of a multi-user AJSS system receiver (e.g., base station) architecture. At the base station side, the base station performs spectrum sensing and judgment by adopting the same method as the user, so as to determine the effective spectrum. Considering that the base station and the users (e.g., user 1 to user k) are located in similar environments, the effective spectrum perceived by the base station and the users is generally the same or approximately the same. And generating a corresponding sequence according to the pseudo-random sequence used by each user, and determining the sequence circulating position corresponding to each user in a relevant mode, thereby obtaining the sending signal estimation of the corresponding user.
In the AJSS system, in order to fully utilize the idle spectrum resources, the AJSS system decomposes the idle frequency band into a series of independent spectrums. Interference between users in non-idle bands is avoided by dynamically changing the spectrum of the transmitted signal within a given spectral range. By random phase matching and cyclic shift keying, the transmitted signal has statistical properties similar to noise and therefore has a lower probability of detection for receivers without a priori information. The AJSS can adapt to a rapidly changing wireless communication environment, actively avoid interference and realize frequency spectrum sharing.
The aforementioned AJSS system has problems while having the aforementioned advantages. The AJSS realizes multiple access through orthogonality among different User basis functions, and as the number of users increases, Multi-User Interference (MUI) destroys orthogonality among different users, thereby affecting multiple access capability.
The following describes an AJSS multiple access scheme based on subcarrier grouping according to an embodiment of the present invention, which can effectively improve multiple access capability on the premise of maintaining the advantages of an AJSS system.
Fig. 3 shows a flow diagram of a subcarrier grouping based signal generation method 300 according to an embodiment of the present invention. The method 300 may include the steps of:
obtaining an effective spectrum 301, obtaining an effective spectrum on a frequency band through modes such as spectrum sensing and the like, namely a subcarrier set which can be used for spectrum sharing;
a subcarrier grouping 302 that acquires a subcarrier grouping for data transmission;
a basic modulation waveform generation unit 303 for generating a basic modulation waveform for the user transmission from the effective spectrum and the subcarrier group; and
and the CCSK modulation 304 is configured to perform cyclic shift on the basic modulation waveform according to the input bits to obtain data to be transmitted. And finally, sending out the data.
The method for transmitting and receiving AJSS signals based on subcarrier grouping is described in detail below in conjunction with fig. 4, fig. 5A and 5B, and fig. 6A and 6B. Fig. 4 shows a schematic diagram of multi-user AJSS system subcarrier allocation according to an embodiment of the present invention. Fig. 5A and 5B are schematic diagrams illustrating a multi-user AJSS system transmitter according to an embodiment of the present invention. Fig. 6A and 6B show schematic diagrams of a multi-user AJSS system receiver structure according to an embodiment of the present invention.
The multi-user AJSS system transmitter shown in fig. 5A may include spectrum sensing and decision 11 for obtaining the effective spectrum. Specifically, a spectrum sensing technology is adopted to obtain the characteristics of an external electromagnetic environment, and the power spectral densities at different frequency points are obtained. Comparing the obtained power spectrum amplitudes of all frequency points with a preset power spectrum amplitude threshold, and constructing a frequency spectrum sequence A ═ A0，A1，...，AN-1]Wherein A iskN-1 represents the occupation situation of each frequency point, if the k-th power spectrum amplitude is larger than the threshold, the frequency point is occupied, and the value A of the frequency point is setkIs 0; if the power spectrum amplitude is less than the threshold, the frequency point is idle, and the value A of the frequency point is setkIs 1. The parameter N is the number of frequency points. By comparing the power spectrum amplitude, a frequency spectrum sequence consisting of the values 0 and 1 can be obtained to describe the use condition of the external environment frequency point. The sequence of spectra may be referred to as a spectrum utility sequence, describing the effective subcarrier locations of the effective spectrum.
It should be noted that, considering that the transmitters of different users and the base station for receiving signals are in the same electromagnetic environment and perform spectrum sensing on the same frequency band with the same timing, the sensed spectrum utility sequences are the same or approximately the same.
In the following description, it is assumed that the spectrum utility sequences acquired by spectrum sensing by different users and transmitters are the same.
The transmitter may further include an acquisition subcarrier packet 12 that acquires information of the subcarrier packet through a predetermined rule or information acquired from the base station.
One possible way is to obtain the subcarrier grouping information directly from the base station. For example, a user obtains all possible grouping manners by reading a common channel, such as downlink control information transmitted in a common search space in the downlink control channel, or system information, or broadcast messages in a broadcast channel, and the like, where all possible grouping manners may form a subcarrier grouping set including a plurality of subcarrier groupings. The grouping mode can be obtained in a look-up table mode. All possible grouping modes can be obtained in a preset mode. In addition, the user acquires the corresponding downlink control information through the C-RNTI of the user through the downlink control information transmitted by the user dedicated channel, for example, the downlink control channel in the user dedicated search space, so as to acquire the corresponding subcarrier grouping index.
In another mode, a user obtains a subcarrier packet allocated to the user by reading a downlink control channel or system information. The grouping mode may be notified by a bit sequence mode, for example, when the bit sequence length is the number of all subcarriers, and the corresponding element is 1, the subcarrier indicating the position belongs to the subcarrier group allocated to the user, otherwise, the subcarrier does not belong to the subcarrier group allocated to the user.
In addition, the sub-carrier grouping information can also be acquired through higher layer signaling.
According to the embodiment of the present invention, in another possible manner, the user acquires the grouping parameter through the downlink control channel or the system information, and generates the corresponding subcarrier grouping through the same grouping manner.
The optimal grouping is such that the maximum cross-correlation between different sub-carrier packets is minimized. However, for an actual system, the complexity of the solution that can satisfy the above conditions is too high, and the method is not suitable for an actual system. Possible solutions are as follows.
For example, the user knows the number G of packets and the number M of subcarriers in each packet, and generates and selects a corresponding subcarrier packet according to a preset rule. This will be described below with reference to fig. 4. A possible approach, a two-step subcarrier grouping approach, is provided, briefly described as follows:
randomly distributing the subcarriers of the whole spectrum, wherein the total number of the subcarriers is N, the number of the subcarriers of each group is M, and the obtained total number of the subcarriers is N
A set of subcarriers. The
The set of groups of subcarriers occupies the entire spectrum, but there is no overlap between different groups of subcarriers.
Then, the rest G-
Set of group subcarriers, the G-
The sub-carrier groups in the sub-carrier set are not overlapped, but can be obtained in the previous step
The subcarrier sets overlap. Combining the two steps, G groups of subcarrier sets each including M subcarriers can be obtained.
The sub-carrier grouping obtained by the above-described procedure is schematically shown in fig. 4. In the example shown in fig. 4, each group of sub-carriers occupies half of the sub-carriers, and needs to be divided into three groups. According to the above procedure, first, a first packet and a second packet which occupy all subcarriers (frequency bands) and do not overlap with each other are obtained, and then, on the basis of the first packet and the second packet, a third packet which overlaps with both the first packet and the second packet is obtained.
That is, a portion of the total subcarrier grouping set GE.g. of
The individual groups of subcarriers in a set of subcarriers are orthogonal, or non-overlapping, with respect to each other. Likewise, for G-
The set of subcarriers, wherein the respective subcarrier groups are orthogonal or non-overlapping with each other. However, there may be overlap between the sets of subcarriers that are subsets of set G, e.g., the third set of fig. 4 may overlap the first and second sets.
The subcarrier sets obtained by the way of grouping in the two steps can reduce the interference among different subcarrier sets, thereby improving the overall performance.
In another grouping method, all subcarriers are equally divided into mutually non-overlapping subcarrier groups. One possible way is that each sub-carrier packet contains the same number of sub-carriers, and each packet does not overlap with each other. When the number of all subcarriers (i.e. bandwidth) N and the number of subcarrier groups G are configured, the number of subcarriers in each subcarrier group is
Can be connected in series
The sub-carriers are divided into a group; or grouping in a predetermined manner, e.g., the intervals between adjacent subcarriers in the same group are equal; or randomly extracting the sub-carriers in each packet and ensuring that different packets do not overlap with each other.
After obtaining the sub-carrier groups, the user selects one group from the sub-carrier groups. The possible ways are:
a. randomly selecting a sub-carrier group from a sub-carrier group set comprising G sub-carrier groups according to equal probability;
b. reading a subcarrier grouping index from a downlink control channel, and selecting a subcarrier grouping according to the subcarrier grouping index;
c. and establishing a corresponding relation between a user network identifier (C-RNTI) and a grouping index in a predetermined mode, and obtaining the grouping index according to the C-RNTI by the user and finally obtaining a corresponding subcarrier grouping.
After obtaining the sub-carrier grouping, the user calculates the frequency spectrum utility sequence corresponding to the grouping
Specifically, the sub-carriers are grouped into ΩgIf subcarrier n belongs to the subcarrier group omega for this usergThen, then
If the subcarrier n does not belong to the subcarrier grouping set omega of the usergThen, then
Through the above-described processing, the signal can be divided into G branches corresponding to respective subcarrier groups, for example, branch 1 to branch G, and the spectrum utility sequence 13 of branches 1 to G is generated accordingly. The branch spectral utility sequence is further used for branch multi-user modulation. The branch multi-user modulation in fig. 5A will be described in detail below with reference to fig. 5B.
The branch multi-user modulation comprises: pseudo-random sequence generation 14, basic modulation waveform generation 15, inverse fourier transform 16 and CCSK modulation 17, as detailed below.
And generating a basic modulation waveform 15, wherein the basic modulation waveform is used for generating a time domain basic modulation waveform required by subsequent CCSK modulation. The specific mode is as follows: first, a random sequence 14 is generated, and then a sequence A is generated according to the frequency spectrum utility of the userg(e.g., frequency utility series 13 in fig. 5A), a base modulation waveform is generated.
Random sequence
The initial state of the generated sequence can be determined by the C-RNTI of the user by adopting an M-sequence, a Gold sequence or the like, or the initial state is controlled according to system information or downlinkThe channel determines the generator polynomial, as well as the initial state.
Or using Zadoff-Chu (ZC) sequence to generate, and determining the base sequence used by the user according to the system information or the downlink control channel.
Or a random phase sequence is adopted, and the generation method is as follows: and a pseudo-random sequence generator is utilized to generate a random bit sequence, the generation of the random bit sequence is related to the user identification C-RNTI, and the base station can generate the same random bit sequence according to the C-RNTI. Thereafter, corresponding pseudo-random sequences are generated based on the phase map, i.e.
Representing the phase of the kth element of the user g random phase sequence. In actual operation, the random access phase sequence may be generated using MPSK. I.e. a random sequence PgEach element in the MPSK modulation is a constellation point of the MPSK modulation, which is determined by a bit group in the random bit sequence.
After obtaining the random sequence, obtaining a frequency domain expression of a basic Modulation Waveform (FMW) of the user by combining the spectrum utility sequence of the user as follows:
wherein λ isgAre normalized parameters. Namely, the frequency domain expression of the basic modulation waveform is obtained by point multiplication of the frequency spectrum utility sequence and the random sequence.
Inverse fourier transforming 16 the following frequency domain expression to obtain the time domain waveform of FMW as follows:
bg＝F-1(Bg)
wherein, F-1(. cndot.) denotes an IDFT operation, and IFFT may also be used.
The CCSK modulation 17 is configured to perform CCSK modulation on bit data to be sent according to the FMW time domain waveform, and specifically includes the following steps: each time taking
The bit data is obtained according to the most right bit and the most significant bit principle
The decimal representation of the bit data is S, and the time domain FMW is cyclically shifted by S units.
It is to be noted that
Cyclic shift of time domain FMW for a group of bits of data can achieve maximum spectrum utilization, but is weak against fading channels. In order to improve the system reliability under the fading channel, the cyclic shift interval can be set to K > 1. At this time, get
One bit for each group, and S for the corresponding decimal number, the cyclic shift amount is KS.
Corresponding to the data transmission described in fig. 5A and 5B, the present embodiment proposes a receiver suitable for the AJSS system based on subcarrier grouping, as shown in fig. 6A and 6B. As described in detail below.
First, the signal received from the receive antenna is converted to a frequency domain waveform via a fourier transform 18. The tributary signal extraction 19 is then performed, e.g. to obtain sub-carrier packets in the same way as the users. Next, multi-user demodulation is performed as shown in fig. 6B.
Detecting the spectrum characteristics of all regions according to the electromagnetic characteristics of the external environment, and comparing the spectrum sensing result with a preset threshold to generate a spectrum utility sequence 20; the spectrum utility sequence 21 of each user is obtained from the branch spectrum sequences 21 (which reflect the sub-carrier groups assigned to the user) and the random sequences 22 assigned to the user. That is, for each subcarrier group, extracting the signals on the subcarriers occupied by the branch in the received signals respectively, setting the signals on the unoccupied subcarriers as 0, and obtaining the received signals of each subcarrier group; and demodulating the signals of each subcarrier group to obtain demodulated data and outputting the demodulated data.
The above demodulation process is as follows:
the CCSK demodulated data is obtained by means of correlation and peak search, which is specifically as follows:
for each sub-carrier group, the corresponding spectrum utility sequence is multiplied by the random sequence of different users, and the product is conjugated. Namely acquiring the conjugate of the basic modulation waveform of the user;
multiplying the received signal of the subcarrier group by the conjugate of the basic modulation waveform, performing inverse fourier transform 24, and extracting a real number part 25;
peak search is performed on the signal subjected to real part extraction, and peak position information is respectively output as demodulation data 26;
and converting the demodulated data into binary data to obtain the detection result of the sub-carrier packet (namely, the corresponding user).
According to the embodiment of the present invention, the ue performs signal transmission as shown in fig. 5A and 5B, and allows multiple users to perform spectrum sensing and data transmission simultaneously on the same time-frequency resource; and the base station distinguishes and detects data from multiple users as shown in fig. 6A and 6B.
Fig. 7 shows a flow chart of a data transmission method 700 according to an embodiment of the invention. The method 700 comprises: step 701, acquiring an effective frequency spectrum on a frequency band; step 702, obtaining configuration information of subcarrier grouping; step 703, generating a random sequence; step 704, generating a basic modulation waveform according to the effective frequency spectrum, the subcarrier grouping and the random sequence; step 705, performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and step 706, transmitting the modulated bit sequence. The method 700 may be performed, for example, in a user equipment.
As described above, configuration information of a subcarrier grouping may be received, and the configuration information includes the configuration information of the subcarrier grouping, random sequence generation configuration information, and a modulation order of a cyclic code shift keying CCSK. According to the configuration information, the user equipment can acquire a subcarrier grouping for the equipment. In obtaining the subcarrier grouping, the user equipment may select the subcarrier grouping from a set of subcarrier groupings, wherein at least a portion of the subcarrier groupings of the set of subcarrier groupings do not overlap, such as described with reference to fig. 4. The user equipment may also generate a random sequence for the device based on the random sequence generation configuration information, which may be used to distinguish the device from other devices. The subcarrier groupings obtained in the manner described above, the generated random sequence, and the acquired effective spectrum may be used to generate a base modulation waveform in step 704.
In addition, the modulation order of CCSK included in the configuration information may be used for cyclic shift modulation in step 705. Specifically, performing cyclic shift modulation on the basic modulation waveform obtained in step 704 according to the bit sequence to be transmitted may further include: and according to the modulation order of the NCCSK modulation of the total number of the subcarriers, carrying out cyclic shift modulation on the basic modulation waveform according to a bit sequence to be sent. For example, in one embodiment, the modulation parameter may be the maximum number of cyclic shifts S that can be used, the adjacent cyclic shift interval ΔsOr one or more of the number of bits B that a single modulation waveform can carry.
Specifically, when the modulation order is the maximum number of cyclic shifts S that can be used, the number of bits that a single base modulation waveform can transmit is determined from the maximum number of cyclic shifts S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Or
When the modulation order is adjacent cyclic shift interval deltasAccording to the cyclic shift interval deltasAnd the total subcarrier number N determines the maximum cyclic shift number S which can be used, and the bit number which can be carried by a single basic modulation waveform is determined according to the maximum cyclic shift number S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the basic modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval is deltas(ii) a Or
When the modulation order is the bit number B which can be carried by a single modulation waveform, determining the cyclic shift interval delta according to the total subcarrier number N and the bit number B which can be carried by the single modulation waveformsGrouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Where S is the maximum number of cyclic shifts, S-2B。
In addition, as described above, the configuration information, for example, the configuration information of the subcarriers, the random sequence generation configuration information, and the like, may be acquired through system information, downlink control information, or higher layer signaling. The configuration information of the sub-carrier grouping may include any one or more of: all possible subcarrier grouping modes and indexes of subcarrier grouping, subcarrier grouping sequences indicating subcarrier grouping modes, and grouping information including subcarrier grouping number and/or subcarrier number in each grouping. The random sequence generation configuration information may include any one or more of: generating information or generating sequence information of the pseudo-random sequence; base sequence and/or initial cyclic shift information of the ZC sequence; initial state information generated by the pseudo-random bit sequence and phase mapping rule information.
The data transmission method according to the embodiment of the present invention is described above. Accordingly, the present invention also provides a corresponding data transmission apparatus (not shown) having corresponding units or modules for (e.g. configured to) implementing the respective method steps. For example, there is provided a data transmission apparatus, which may include: an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band; a subcarrier grouping acquisition unit configured to acquire configuration information of a subcarrier grouping; a random sequence generation unit configured to generate a random sequence; a basic modulation waveform generation unit configured to generate a basic modulation waveform from the effective spectrum, the subcarrier group, and the random sequence; a modulation unit configured to perform cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and a transmitting unit configured to transmit the modulated bit sequence. Note that the data transmission apparatus may be generally implemented in a user equipment. The above listed units or modules can equally be configured to or perform various details of the above described methods.
Fig. 8 shows a flow chart of a data receiving method 800 according to an embodiment of the invention. The data processing method 800 includes: step 801, acquiring an effective frequency spectrum on a frequency band; step 802, extracting branch signals corresponding to the sub-carrier grouping based on the effective frequency spectrum and the sub-carrier grouping; and a step 803 of extracting data from the branch signal according to the random sequence and demodulating the data. For example, the data processing method may be generally performed on the base station side.
Similarly, the present invention also provides a corresponding data processing apparatus (not shown) having corresponding units or modules for (e.g. configured to) implementing respective method steps, such as: an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band; a tributary signal extraction unit configured to extract tributary signals corresponding to the subcarrier packets based on the effective spectrum and the subcarrier packets; and an extraction unit configured to extract data from the branch signal according to a random sequence and demodulate.
Fig. 9 shows a flow chart of a data receiving method 900 according to an embodiment of the invention. The method 900 for spectrum sharing includes: step 901, sending configuration information to user equipment, where the configuration information includes configuration information of subcarrier grouping, random sequence generation configuration information, and modulation order of cyclic code shift keying CCSK; and step 902, receiving a bit sequence sent by the user equipment, wherein the bit sequence is obtained by the user equipment after performing cyclic shift modulation on a basic modulation waveform according to the bit sequence to be sent, and the basic modulation waveform is generated according to an effective frequency spectrum on a frequency band, a subcarrier grouping and a random sequence. For example, the method for spectrum sharing may be generally performed at the base station side.
Similarly, the present invention also provides a corresponding apparatus for spectrum sharing (not shown) having corresponding means or modules for (e.g. configured to) implement the respective method steps, such as: a configuration information sending unit configured to send configuration information to the user equipment, the configuration information including configuration information of subcarrier grouping, random sequence generation configuration information, and a modulation order of Cyclic Code Shift Keying (CCSK); and a receiving unit, configured to receive a bit sequence transmitted by a user equipment, where the bit sequence is obtained after the user equipment performs cyclic shift modulation on a basic modulation waveform according to the bit sequence to be transmitted, and the basic modulation waveform is generated according to an effective spectrum on a frequency band, a subcarrier group, and a random sequence.
In addition, the present invention also provides a computer-readable storage medium, which may include instructions that, when executed by a processor (e.g., any type of processor provided in a user equipment or a base station), cause the processor to perform any of the methods described above.
Although example embodiments have been described, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the inventive concept. Accordingly, it should be understood that the above-described exemplary embodiments are not limiting, but illustrative.
Claims (15)
1. A method of data transmission, comprising:
acquiring an effective frequency spectrum on a frequency band;
acquiring configuration information of subcarrier grouping;
generating a random sequence;
generating a basic modulation waveform according to the effective frequency spectrum, the subcarrier grouping and the random sequence;
performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and
and transmitting the modulated bit sequence.
2. The method of claim 1, wherein obtaining configuration information for a subcarrier grouping comprises:
and receiving configuration information, wherein the configuration information comprises configuration information of subcarrier grouping, random sequence generation configuration information and modulation order of the cyclic code shift keying CCSK.
3. The method of claim 1, obtaining a subcarrier grouping comprises: selecting the grouping of subcarriers from a grouping set of subcarriers, wherein at least a portion of the grouping of subcarriers of the grouping set of subcarriers do not overlap.
4. The method of claim 1, wherein the cyclic shift modulation is Cyclic Code Shift Keying (CCSK) modulation, and wherein cyclic shift modulating the base modulation waveform according to a bit sequence to be transmitted further comprises: and according to the total number N of subcarriers and the modulation order of the CCSK modulation, performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted.
5. The method of claim 4, wherein performing cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted according to a total number of subcarriers N and a modulation order of the CCSK modulation comprises:
when the modulation order is the maximum cyclic shift number S which can be used, determining the bit number which can be transmitted by a single basic modulation waveform according to the maximum cyclic shift number S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Or
When the modulation order is adjacent cyclic shift interval deltasAccording to the cyclic shift interval deltasAnd the total subcarrier number N determines the maximum cyclic shift number S which can be used, and the bit number which can be carried by a single basic modulation waveform is determined according to the maximum cyclic shift number S
Grouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the basic modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval is deltas(ii) a Or
When the modulation order is the bit number B which can be carried by a single modulation waveform, determining the cyclic shift interval delta according to the total subcarrier number N and the bit number B which can be carried by the single modulation waveformsGrouping bit sequences to be transmitted according to the bit number B, and converting each group into a 10-system number; cyclically shifting the base modulation waveform according to the 10-ary number and a cyclic shift interval, wherein the cyclic shift interval
Or
Where S is the maximum number of cyclic shifts, S-2B。
6. The method of any of claims 1 to 5, wherein obtaining configuration information for a subcarrier grouping comprises: and acquiring the configuration information of the subcarrier grouping through system information or downlink control information or high-level signaling.
7. The method according to any of claims 2 or 6, wherein the configuration information of the sub-carrier grouping comprises any one or more of: all possible subcarrier grouping modes and indexes of subcarrier grouping, subcarrier grouping sequences indicating subcarrier grouping modes, and grouping information including subcarrier grouping number and/or subcarrier number in each grouping.
8. The method of claim 2, wherein the random sequence generation configuration information comprises any one or more of: generating information or generating sequence information of the pseudo-random sequence; base sequence and/or initial cyclic shift information of the ZC sequence; initial state information generated by the pseudo-random bit sequence and phase mapping rule information.
9. The method of claim 2, wherein the CCSK modulation order comprises any one or more of: maximum number of cyclic shifts S that can be used, adjacent cyclic shift interval ΔsOr the number of bits B that a single modulation waveform can carry.
10. A data receiving method, comprising:
acquiring an effective frequency spectrum on a frequency band;
extracting branch signals corresponding to the subcarrier packets based on the effective spectrum and the subcarrier packets; and
and extracting data from the branch signals according to the random sequence and demodulating the data.
11. A data receiving method, comprising:
sending configuration information to user equipment, wherein the configuration information comprises configuration information of subcarrier grouping, random sequence generation configuration information and a modulation order of a Cyclic Code Shift Keying (CCSK); and
receiving a bit sequence sent by user equipment, wherein the bit sequence is obtained by the user equipment after performing cyclic shift modulation on a basic modulation waveform according to the bit sequence to be sent, and the basic modulation waveform is generated according to an effective frequency spectrum, a subcarrier group and a random sequence on a frequency band.
12. A transmitter, comprising:
an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band;
a subcarrier grouping acquisition unit configured to acquire configuration information of a subcarrier grouping;
a random sequence generation unit configured to generate a random sequence;
a basic modulation waveform generation unit configured to generate a basic modulation waveform from the effective spectrum, the subcarrier group, and the random sequence;
a modulation unit configured to perform cyclic shift modulation on the basic modulation waveform according to a bit sequence to be transmitted; and
a transmitting unit configured to transmit the modulated bit sequence.
13. A receiver, comprising:
an effective spectrum acquisition unit configured to acquire an effective spectrum on a frequency band;
a tributary signal extraction unit configured to extract tributary signals corresponding to the subcarrier packets based on the effective spectrum and the subcarrier packets; and
and the extraction unit is configured to extract data from the branch signals according to a random sequence and demodulate the data.
14. A receiver, comprising:
a configuration information sending unit configured to send configuration information to the user equipment, the configuration information including configuration information of subcarrier grouping, random sequence generation configuration information, and a modulation order of Cyclic Code Shift Keying (CCSK); and
the receiver comprises a receiving unit configured to receive a bit sequence transmitted by a user equipment, wherein the bit sequence is obtained after the user equipment performs cyclic shift modulation on a basic modulation waveform according to the bit sequence to be transmitted, and the basic modulation waveform is generated according to an effective spectrum on a frequency band, a subcarrier group and a random sequence.
15. A computer-readable storage medium comprising instructions that, when executed by a processor, cause the processor to perform the method of any of claims 1 to 11.
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Cited By (2)
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|---|---|---|---|---|
| WO2023005944A1 (en) * | 2021-07-29 | 2023-02-02 | 华为技术有限公司 | Data transmission method and related apparatus |
| WO2024007937A1 (en) * | 2022-07-08 | 2024-01-11 | 华为技术有限公司 | Modulation and coding method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005944A1 (en) * | 2021-07-29 | 2023-02-02 | 华为技术有限公司 | Data transmission method and related apparatus |
| WO2024007937A1 (en) * | 2022-07-08 | 2024-01-11 | 华为技术有限公司 | Modulation and coding method and apparatus |
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