CN112713912B - Spread spectrum index modulation and demodulation communication method, transmitter, receiver and storage medium - Google Patents
Spread spectrum index modulation and demodulation communication method, transmitter, receiver and storage medium Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The embodiment of the invention discloses a communication method, a transmitter, a receiver and a storage medium for modulation and demodulation of spread spectrum indexes. The spread spectrum index modulation communication method comprises the following steps: acquiring information to be transmitted; carrying out quality evaluation on a channel corresponding to information to be transmitted to obtain the bit length of code index information and the bit length of modulation information; carrying out bit grouping on information to be transmitted according to the bit length of the code index information and the bit length of the modulation information to obtain a code index information bit group and a modulation information bit group; obtaining a spread spectrum code sequence according to the code index information bit group, and obtaining a modulation symbol according to the modulation information bit length and the modulation information bit group; and obtaining a spread spectrum modulation signal according to the spread spectrum code sequence and the modulation symbol. By dividing the information to be transmitted into a code index information bit group and a modulation information bit group through bit grouping and transmitting a part of the information to be transmitted through a spread spectrum code sequence, the communication reliability is ensured and the utilization rate of time-frequency resources is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a communication method, a communication device and a storage medium.
Background
Wireless communication has technical indicators of reliability and effectiveness, and effectiveness requires maximization of resource utilization within limited resources, and resources mainly include time domain resources and frequency domain resources. With the development of wireless communication technology, the utilization rate of time-frequency resources can be improved to a certain extent by the technologies such as source coding, space division multiplexing, beam forming and the like under the condition of not changing the transmission power and the bandwidth.
Although the existing communication technology can improve the utilization rate of time-frequency resources to a certain extent, the existing communication technology still has defects, mainly has strict requirements on antenna synchronization, and the complexity of modulation of a transmitter and a demodulation algorithm of a receiver is usually higher, so that the improvement of the utilization rate of the time-frequency resources is influenced.
Disclosure of Invention
The embodiment of the invention provides a communication method, a transmitter, a receiver and a storage medium for modulation and demodulation of spread spectrum indexes, which are used for realizing effective transmission of wireless communication signals.
In a first aspect, an embodiment of the present invention provides a spread spectrum index modulation communication method, applied to a transmitter, including: acquiring information to be transmitted, wherein the information to be transmitted comprises a preset number of segmented information;
performing quality evaluation on a channel corresponding to information to be transmitted to obtain a code index information bit length and a modulation information bit length, wherein the sum of the code index information bit length and the modulation information bit length is equal to a preset number;
carrying out bit grouping on information to be transmitted according to the bit length of the code index information and the bit length of the modulation information to obtain a code index information bit group and a modulation information bit group;
obtaining a spread spectrum code sequence according to the code index information bit group, and obtaining a modulation symbol according to the modulation information bit length and the modulation information bit group;
and obtaining a spread spectrum modulation signal according to the spread spectrum code sequence and the modulation symbol.
In a second aspect, an embodiment of the present invention provides a method for spread spectrum index demodulation communication, which is applied to a receiver, and includes: obtaining a spread spectrum signal;
obtaining a spreading code serial number to be demodulated and a modulation symbol to be demodulated according to the spreading signal;
obtaining a code index information bit group according to the serial number of the spread spectrum code to be demodulated;
demodulating according to the modulation symbol to be demodulated to obtain a modulation information bit group;
and assembling the code index information bit group and the modulation information bit group to obtain the receiving information.
In a third aspect, an embodiment of the present invention provides a transmitter, where the transmitter includes:
one or more processors;
storage means for storing one or more programs;
when executed by one or more processors, cause the one or more processors to implement a spread-spectrum-index-modulation communication method as described above.
In a fourth aspect, an embodiment of the present invention provides a receiver, where the receiver includes:
one or more processors;
storage means for storing one or more programs;
when executed by one or more processors, cause the one or more processors to implement a spread-spectrum index demodulation communication method as described above.
In a fifth aspect, embodiments of the present invention provide a computer storage medium having a computer program stored thereon, which when executed by a processor, implement a method according to any of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, the information to be transmitted is divided into the code index information bit group and the modulation information bit group through bit grouping, and a part of the information to be transmitted is transmitted through the spread spectrum code sequence, so that the communication reliability is ensured, and the utilization rate of time-frequency resources is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1(a) is a flowchart of a spread spectrum index modulation communication method according to an embodiment of the present invention;
fig. 1(b) is a schematic diagram of a basic framework of a transmitter according to an embodiment of the present invention;
fig. 2(a) is a flowchart of a spread spectrum index demodulation communication method according to a second embodiment of the present invention;
fig. 2(b) is a schematic diagram of a basic framework of a receiver according to a second embodiment of the present invention;
fig. 3 is a schematic hardware structure diagram of a transmitter according to a third embodiment of the present invention;
fig. 4 is a schematic hardware structure diagram of a receiver according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be further noted that, for the convenience of description, only some but not all of the relevant elements of the present invention are shown in the drawings. Before discussing exemplary embodiments in greater detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1(a) is a flowchart of a spread spectrum index modulation communication method according to an embodiment of the present invention, where this embodiment is applicable to a case where a transmitter transmits a wireless communication signal, and the method specifically includes the following operations:
step S101, obtaining information to be transmitted, wherein the information to be transmitted comprises a preset number of segment information.
Fig. 1(b) is a schematic diagram of a basic frame of a transmitter, and this embodiment is mainly based on the basic frame of the transmitter shown in fig. 1(b) to execute the spread spectrum index modulation communication method of this embodiment.
Optionally, the obtaining of the information to be transmitted may include: acquiring an original bit stream to be transmitted; segmenting the original bit stream to be transmitted according to a preset number of bits to obtain information to be transmitted.
Specifically, the preset number in this embodiment may be N, and after the original bit stream to be transmitted is obtained, the original bit stream to be transmitted is segmented according to N bits, so as to obtain information a to be transmitted including N pieces of segmentation informationi＝{ai，0，ai，1…，ai，N-1}。
Step S102, carrying out quality evaluation on a channel corresponding to information to be transmitted to obtain a code index information bit length and a modulation information bit length, wherein the sum of the code index information bit length and the modulation information bit length is equal to a preset number.
In this embodiment, the transmitter may further perform quality evaluation on a channel corresponding to information to be transmitted, obtain a code index information bit length according to a quality evaluation result, which is denoted by M, and adjust the information bit length, which is denoted by L, and require that the sum of the code index information bit length and the modulation information bit length is equal to a preset number, that is, N is M + L.
And step S103, carrying out bit grouping on the information to be transmitted according to the code index information bit length and the modulation information bit length to obtain a code index information bit group and a modulation information bit group.
Optionally, the bit grouping the information to be transmitted according to the code index information bit length and the modulation information bit length to obtain the code index information bit group and the modulation information bit group may include: selecting the segment information of the code index information bit length from the initial position of the information to be transmitted, and taking the segment information containing the code index information bit length as a code index information bit group; and taking the rest segment information in the information to be transmitted as a modulation information bit group, wherein the number of the segment information contained in the modulation information bit group is the same as the length of the modulation information bit.
Specifically, in this embodiment, the information a to be transmitted is determined according to the code index information bit length M and the adjustment information bit length Li＝{ai，0，ai，1…，ai，N-1Carry out bit grouping, specifically from the information a to be transmittediThe starting position of the code index information selects M pieces of segment information, and the M pieces of segment information are used as code index information bit groups
Represents; since N is M + L, the segment information remaining in the information to be transmitted is used as a modulation information bit group
And the number of pieces of segment information contained in the modulation information bit group is L. For example,
therefore, the information to be transmitted can be divided into code index information bit groups in sequence through bit grouping
And modulating the block of information bits
Step S104, obtaining a spread spectrum code sequence according to the code index information bit group, and obtaining a modulation symbol according to the modulation information bit length and the modulation information bit group.
Optionally, obtaining the spreading code sequence according to the code index information bit group may include: obtaining a mapping sequence number according to the code index information bit group; searching from a preset spreading code set according to the mapping sequence number to obtain a spreading code sequence corresponding to the mapping sequence number, wherein the preset spreading code set comprises 2Code index information bit lengthAnd each spreading code sequence corresponds to a different serial number.
Specifically, the preset spreading code set in this embodiment is a set with good cross-correlation, and the type may be m-sequence, Gold code, Hadamard sequence, or DFT variant basis vector. Including 2 in a predetermined set of spreading codesMAnd each spreading code sequence corresponds to a different serial number. And indexing the information bit groups according to the codes
Mapping into a spreading code sequence may include various ways, in this embodiment according to the code index information bit group
When generating the spread spectrum code sequence, specifically, the code index information bit group is adopted
Conversion to decimal value CIiAnd combine CIiAnd as a mapping sequence number, searching from a preset spreading code set to acquire a spreading code sequence corresponding to the mapping sequence number. Table 1 below shows a schematic diagram of a preset spreading code set represented in a list form:
TABLE 1
| Serial number | Spreading code sequence |
| 1 | 1 1 1 1… |
| 2 | 1 1 -1 1… |
| … | … |
| 2M | 1 -1 1 -1… |
For example, in determining code index information bit groups
For, convert it into decimal system to obtain mapping serial number CIiIf 2, the spreading code sequence c corresponding to the sequence number 2 is searched from the table 1 according to the mapping sequence number 2i＝{1，1，-1，1，…}。
Optionally, obtaining the modulation symbol according to the modulation information bit length and the modulation information bit group may include: determining a modulation order according to the bit length of the modulation information; and mapping the modulation information bit group based on the modulation order to obtain a modulation symbol.
Specifically, in the present embodiment, when the modulation order is determined according to the modulation information bit length L, the modulation order may be calculated by using a formula m — log2(L), where m represents the modulation order. Modulating information bit group based on modulation order m
Mapping can obtain a modulation symbol si。
It should be noted that different symbol modulation schemes can be selected for the same modulation order, and when the modulation order m is 2, Binary Phase Shift Keying (BPSK) or differential Coherent Binary Phase Shift Keying (DBPSK) can be selected; when the modulation order m is 4, Quadrature Phase Shift Keying (QPSK) or Offset Quadrature Phase Shift Keying (Offset Quadrature Phase Shift Keying) may be selected; when the Modulation order m is 16, Quadrature Amplitude Modulation (16 QAM) or Amplitude Phase Shift Keying (16 APSK) may be selected. For example, when the modulation order is determined to be m-2 and the adopted symbol modulation scheme is BPSK, the information bit group is modulated
By modulating groups of information bits
The modulation symbol obtained by mapping is si＝-1。
Step S105 obtains a spread modulation signal from the spread code sequence and the modulation symbol.
Optionally, obtaining a spread spectrum modulation signal according to the spreading code sequence and the modulation symbol may include: determining each element contained in a spreading code sequence; multiplying the modulation symbol with each element in the spread spectrum code sequence respectively to obtain a spread spectrum signal; and carrying out orthorhombic IQ modulation on the spread spectrum signal to obtain a spread spectrum modulation signal.
Optionally, after obtaining the spread modulation signal according to the spreading code sequence and the modulation symbol, the method may further include: the spread spectrum modulated signal is transmitted to a receiver through an antenna.
Specifically, the spreading code sequence c is obtainediAnd modulation symbol siThereafter, a spread modulation signal can be obtained from the spread code sequence and the modulation symbol. For example, when the spreading code sequence is determined to be ci1, 1, -1, 1, …, modulation symbol siWhen-1, modulation symbol siRespectively with spreading code sequence ciTo obtain a spread signal ti{ -1, -1, 1, -1, … }. And after acquiring the spread spectrum signal, the transmitter performs In-phase Quadrature (IQ) modulation on the spread spectrum signal to acquire a spread spectrum modulation signal, and transmits the spread spectrum modulation signal to the receiver through the antenna.
According to the technical scheme of the embodiment of the invention, the information to be transmitted is divided into the code index information bit group and the modulation information bit group through bit grouping, and a part of the information to be transmitted is transmitted through the spread spectrum code sequence, so that the communication reliability is ensured, and the utilization rate of time-frequency resources is improved.
Example two
Fig. 2(a) is a flowchart of a spread spectrum index demodulation communication method according to a second embodiment of the present invention, where this embodiment is applicable to a case where a receiver transmits a wireless communication signal, and the method specifically includes the following operations:
in step S201, a spread spectrum signal is obtained.
Fig. 2(b) is a schematic diagram of a basic framework of a transmitter, and this embodiment mainly executes the spread spectrum index demodulation communication method according to this embodiment based on the basic framework of the transmitter shown in fig. 2 (b).
Optionally, obtaining a spread spectrum signal, including: IQ demodulation is carried out on the spread spectrum modulation signal sent by a transmitter to obtain a complex baseband signal; and performing time-frequency synchronization on the complex baseband signal to obtain a spread spectrum signal.
In this embodiment, the receiver performs IQ demodulation on the spread spectrum modulation signal received by the antenna to obtain a complex baseband signal, and then performs time-frequency synchronization on the complex baseband signal to obtain a spread spectrum signal ri。
Step S202, obtaining the serial number of the spread spectrum code to be demodulated and the modulation symbol to be demodulated according to the spread spectrum signal.
Optionally, obtaining the spreading code number to be demodulated and the modulation symbol to be demodulated according to the spreading signal may include: performing inner product calculation on the spread spectrum signal and each spread spectrum code sequence of a preset spread spectrum code set respectively to obtain an inner product corresponding to each spread spectrum code sequence; determining a serial number corresponding to the inner product with the maximum modulus, and taking the serial number as a serial number of a spread spectrum code to be demodulated; and taking the inner product with the maximum modulus value as a modulation symbol to be demodulated.
Specifically, in this embodiment, the preset spreading code set and the spreading code sequence obtained by the transmitter according to the code index information bit group use the same preset spreading code set, so that the preset spreading code set still includes 2MAnd a spreading code sequence, wherein M represents the bit length of code index information obtained when a transmitter corresponding to the receiver performs channel quality estimation. By spreading the signal riPerforming inner product calculation with each spreading code sequence in the preset spreading code set to obtain the inner product d corresponding to each spreading code sequencei，jWherein j is 1, … 2MComparing the modulus of the inner product corresponding to each spread spectrum code sequence and determining the sequence number CI corresponding to the inner product with the maximum modulusi＝maxj|di，jAnd the serial numbers CIiAs the serial number of the spreading code to be demodulated. Simultaneously, the inner product with the maximum modulus value is taken as the modulation symbol to be demodulated
It should be noted that the preset spreading code set in this embodiment is a set with good cross-correlation, and when the preset spreading code set is composed of a Hadamard sequence or a DFT variant basis vector, the inner product operation of the receiver can be completed by fast Hadamard transform and FFT transform, thereby further simplifying the determination method of the spreading code number to be demodulated and the modulation symbol to be demodulated.
Step S203, obtaining code index information bit group according to the sequence number of the spread spectrum code to be demodulated.
Optionally, obtaining the code index information bit group according to the spreading code sequence number to be demodulated may include: determining a mapping sequence number according to the sequence number of the spreading code to be demodulated, wherein the mapping sequence number is used for searching the spreading code sequence from a preset spreading code set; and obtaining the code index information bit group according to the mapping sequence number.
Specifically, in the present embodiment, the spreading code sequence number CI is determined according to the to-be-demodulated spreading codeiWhen obtaining the code index information bit group, it specifically adopts the method according to the sequence number CI of the spread spectrum code to be demodulatediDetermining mapping numbers, e.g. in determining the spreading code number CI to be demodulatediWhen the mapping sequence number is 2, the mapping sequence number is determined to be 2. Obtaining code index information bit group by converting mapping serial number into binary system
And step S204, demodulating according to the modulation symbol to be demodulated to obtain a modulation information bit group.
Specifically, in the present embodiment, modulation symbols to be demodulated are obtained
Then, the modulation method is carried out according to the inverse process of the modulation of the transmitter symbols
Demodulating to obtain modulated information bit group
Step S205, assembling the code index information bit group and the modulation information bit group to obtain the received information.
Specifically, in this embodiment, the code index information bit group is obtained
And modulating the block of information bits
Then, will be
And
assembling in sequence to obtain received information
Thereby realizing the reception of the spread spectrum modulation signal transmitted by the transmitter by the receiver,
according to the technical scheme of the embodiment of the invention, the received spread spectrum signal is despread to obtain the serial number of the spread spectrum code to be demodulated and the modulation symbol to be demodulated, the serial number of the spread spectrum code to be demodulated is demapped to obtain the code index information bit group, the modulation symbol to be demodulated is demodulated to obtain the modulation information bit group, and the code index information bit group and the modulation information bit group are assembled to obtain the received information, so that the communication reliability is ensured and the utilization rate of time-frequency resources is improved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a transmitter according to an embodiment of the present invention. Fig. 3 shows a block diagram of an exemplary transmitter 312 suitable for use in implementing embodiments of the present invention. The transmitter 312 shown in fig. 3 is only an example and should not bring any limitations to the function and scope of use of the embodiments of the present invention.
As shown in fig. 3, the transmitter 312 is in the form of a general purpose computer transmitter. The components of the transmitter 312 may include, but are not limited to: one or more processors 316, a memory 328, and a bus 318 that couples the various system components including the memory 328 and the processors 316.
The transmitter 312 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by transmitter 312 and includes both volatile and nonvolatile media, removable and non-removable media.
The memory 328 is used to store instructions. Memory 328 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)330 and/or cache memory 332. The transmitter 312 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 334 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, and commonly referred to as a "hard drive"). Although not shown in FIG. 3, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 318 by one or more data media interfaces. Memory 328 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 340 having a set (at least one) of program modules 342 may be stored, for example, in memory 328, such program modules 342 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 342 generally perform the functions and/or methodologies of the described embodiments of the invention.
The transmitter 312 may also communicate with one or more external devices 314 (e.g., keyboard, pointing transmitter, display 324, etc.), with one or more transmitters that enable a user to interact with the transmitter 312, and/or with any transmitters (e.g., network card, modem, etc.) that enable the transmitter 312 to communicate with one or more other computer transmitters. Such communication may occur via input/output (I/O) interfaces 322. Also, the transmitter 312 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 320. As shown, the network adapter 320 communicates with the other modules of the transmitter 312 over the bus 318. It should be appreciated that although not shown in fig. 3, other hardware and/or software modules may be used in conjunction with the transmitter 312, including but not limited to: microcode, transmitter drives, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Example four
Fig. 4 is a schematic structural diagram of a receiver according to an embodiment of the present invention. Fig. 4 illustrates a block diagram of an exemplary receiver 412 suitable for use in implementing embodiments of the present invention. The receiver 412 shown in fig. 4 is only an example and should not impose any limitation on the functionality or scope of use of embodiments of the present invention.
As shown in fig. 4, receiver 412 is in the form of a general purpose computing receiver. The components of receiver 412 may include, but are not limited to: one or more processors 416, a memory 428, and a bus 418 that couples the various system components (including the memory 428 and the processors 416).
The memory 428 is used to store instructions. Memory 428 can include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)430 and/or cache memory 432. The receiver 412 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 434 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 4, commonly referred to as a "hard drive"). Although not shown in FIG. 4, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 418 by one or more data media interfaces. Memory 428 can include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 440 having a set (at least one) of program modules 442 may be stored, for instance, in memory 428, such program modules 442 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination of which may comprise an implementation of a network environment. The program modules 442 generally perform the functions and/or methodologies of the described embodiments of the invention.
The receiver 412 may also communicate with one or more external devices 414 (e.g., keyboard, pointing receiver, display 424, etc.), with one or more receivers that enable a user to interact with the receiver 412, and/or with any receiver (e.g., network card, modem, etc.) that enables the receiver 412 to communicate with one or more other computing receivers. Such communication may occur via input/output (I/O) interfaces 422. Also, the receiver 412 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) through a network adapter 420. As shown, network adapter 420 communicates with the other modules of receiver 412 over bus 418. It should be appreciated that although not shown in fig. 4, other hardware and/or software modules may be used in conjunction with the receiver 412, including but not limited to: microcode, receiver drives, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processor 416 executes instructions stored in the memory 428 to perform various functional applications and data processing, such as implementing the spread spectrum index demodulation communication method provided by the embodiment of the present invention: obtaining a spread spectrum signal; obtaining a spreading code serial number to be demodulated and a modulation symbol to be demodulated according to the spreading signal; obtaining a code index information bit group according to the serial number of the spread spectrum code to be demodulated; demodulating according to the modulation symbol to be demodulated to obtain a modulation information bit group; and assembling the code index information bit group and the modulation information bit group to obtain the receiving information.
EXAMPLE five
Embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a spread spectrum index modulation communication method as provided in a first embodiment of all inventions of this application:
acquiring information to be transmitted, wherein the information to be transmitted comprises a preset number of segmented information; performing quality evaluation on a channel corresponding to information to be transmitted to obtain a code index information bit length and a modulation information bit length, wherein the sum of the code index information bit length and the modulation information bit length is equal to a preset number; carrying out bit grouping on information to be transmitted according to the bit length of the code index information and the bit length of the modulation information to obtain a code index information bit group and a modulation information bit group; obtaining a spread spectrum code sequence according to the code index information bit group, and obtaining a modulation symbol according to the modulation information bit length and the modulation information bit group; and obtaining a spread spectrum modulation signal according to the spread spectrum code sequence and the modulation symbol.
Or, implementing the spread spectrum index demodulation communication method provided by the second invention embodiment of the present application:
obtaining a spread spectrum signal; obtaining a spreading code serial number to be demodulated and a modulation symbol to be demodulated according to the spreading signal; obtaining a code index information bit group according to the serial number of the spread spectrum code to be demodulated; demodulating according to the modulation symbol to be demodulated to obtain a modulation information bit group; and assembling the code index information bit group and the modulation information bit group to obtain the receiving information.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A communication method of spread spectrum index modulation is applied to a transmitter, and is characterized by comprising the following steps:
acquiring information to be transmitted, wherein the information to be transmitted comprises a preset number of segmented information;
performing quality evaluation on a channel corresponding to the information to be transmitted to obtain a code index information bit length and a modulation information bit length, wherein the sum of the code index information bit length and the modulation information bit length is equal to the preset number; the code index information bit length is expressed by M, and the modulation information bit length is expressed by L;
carrying out bit grouping on the information to be transmitted according to the code index information bit length and the modulation information bit length to obtain a code index information bit group and a modulation information bit group;
obtaining a spread spectrum code sequence according to the code index information bit group, and obtaining a modulation symbol according to the modulation information bit length and the modulation information bit group;
obtaining a spread spectrum modulation signal according to the spread spectrum code sequence and the modulation symbol;
the obtaining of the modulation symbol according to the modulation information bit length and the modulation information bit group includes:
determining a modulation order according to the bit length of the modulation information;
mapping the modulation information bit group based on the modulation order to obtain the modulation symbol;
the determining the modulation order according to the modulation information bit length includes:
calculating according to a formula m-log 2 (L); where m represents the modulation order.
2. The method of claim 1, wherein the obtaining information to be transmitted comprises:
acquiring an original bit stream to be transmitted;
and segmenting the original bit stream to be transmitted according to the preset number of bits to obtain the information to be transmitted.
3. The method of claim 1, wherein the bit grouping the information to be transmitted according to the code index information bit length and the modulation information bit length to obtain a code index information bit group and a modulation information bit group comprises:
selecting the segment information of the code index information bit length from the initial position of the information to be transmitted, and taking the segment information containing the code index information bit length as the code index information bit group;
and taking the rest segmented information in the information to be transmitted as the modulation information bit group, wherein the number of the segmented information contained in the modulation information bit group is the same as the length of the modulation information bit.
4. The method of claim 3, wherein obtaining a spreading code sequence from the code index information bit group comprises:
obtaining a mapping sequence number according to the code index information bit group;
searching from a preset spreading code set according to the mapping sequence number to acquire a spreading code sequence corresponding to the mapping sequence number, wherein the preset spreading code set comprises 2MAnd each spreading code sequence corresponds to a different serial number.
5. The method of claim 1, wherein obtaining a spread modulation signal from the spreading code sequence and the modulation symbol comprises:
determining each element contained in the spreading code sequence;
multiplying the modulation symbol with each element in a spread spectrum code sequence respectively to obtain a spread spectrum signal;
and carrying out orthonormal IQ modulation on the spread spectrum signal to obtain the spread spectrum modulation signal.
6. The method of claim 1, wherein after obtaining a spread modulation signal from the spreading code sequence and the modulation symbol, further comprising:
and transmitting the spread spectrum modulation signal to a receiver through an antenna.
7. A method for spread spectrum index demodulation communication for use in a receiver, comprising:
obtaining a spread spectrum signal;
obtaining a spreading code serial number to be demodulated and a modulation symbol to be demodulated according to the spreading signal;
obtaining a code index information bit group according to the sequence number of the spread spectrum code to be demodulated;
demodulating according to the modulation symbol to be demodulated to obtain a modulation information bit group;
assembling the code index information bit group and the modulation information bit group to obtain receiving information;
the method comprises the steps that quality evaluation is carried out on a channel corresponding to information to be transmitted to obtain the bit length of code index information and the bit length of modulation information; and carrying out bit grouping on the information to be transmitted according to the code index information bit length and the modulation information bit length to obtain a code index information bit group and a modulation information bit group.
8. The method of claim 7, wherein the obtaining a spread spectrum signal comprises:
carrying out orthometric IQ demodulation on a spread spectrum modulation signal sent by a transmitter to obtain a complex baseband signal;
and performing time-frequency synchronization on the complex baseband signal to obtain the spread spectrum signal.
9. The method according to claim 7, wherein the obtaining a spreading code number to be demodulated and a modulation symbol to be demodulated according to the spreading signal comprises:
performing inner product calculation on the spread spectrum signal and each spread spectrum code sequence of a preset spread spectrum code set respectively to obtain an inner product corresponding to each spread spectrum code sequence;
determining a serial number corresponding to the inner product with the maximum modulus value, and taking the serial number as the serial number of the spread spectrum code to be demodulated;
and taking the inner product with the maximum modulus value as the modulation symbol to be demodulated.
10. The method as claimed in claim 7, wherein said obtaining the code index information bit group according to the spreading code number to be demodulated comprises:
determining a mapping sequence number according to the sequence number of the spreading code to be demodulated, wherein the mapping sequence number is used for searching the spreading code sequence from a preset spreading code set;
and obtaining the code index information bit group according to the mapping sequence number.
11. A transmitter, characterized in that the transmitter comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-6.
12. A receiver, characterized in that the receiver comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 7-10.
13. A computer storage medium on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of any one of claims 1 to 6 or the method of any one of claims 7 to 10.
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| CN113630149B (en) * | 2021-07-30 | 2022-09-16 | 厦门大学 | Multi-sequence spread spectrum communication method and system based on index modulation |
| CN114584181B (en) * | 2022-03-01 | 2024-01-23 | 广东电网有限责任公司江门供电局 | Spread spectrum communication method, system, sending module and receiving module based on power line |
| CN114584178B (en) * | 2022-03-01 | 2023-12-29 | 广东电网有限责任公司江门供电局 | Code index time division multiple access method and device based on power line channel |
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