CN108200001B - Method and apparatus for multi-layer modulation of signals in a communication system - Google Patents
Method and apparatus for multi-layer modulation of signals in a communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3472—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel by switching between alternative constellations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
Abstract
The invention discloses a method and a device for multi-layer modulation of signals in a communication system, which firstly divide transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of the communication system; then, according to the transmission requirements of the multiple paths of information streams, determining the modulation mode of the signal for each path of information stream; then setting constellation map for all modulation signals under each modulation mode; then, according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal, generating a modulation signal for each path of information stream; then, according to the transmission requirement of the multi-channel information stream and the channel state information, the modulation signals and the constellation map mapping of the multi-channel information stream are combined to generate the multi-layer modulation signals and the constellation map mapping of the communication system. The invention realizes the high-efficiency modulation and mapping of the transmitting end data from the bit to the multilayer modulation signal by determining the matched modulation mode and the constellation mapping for the multi-channel information stream and then combining and processing the modulation signal according to the transmission requirement and the channel state of the multi-channel information stream.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for multi-layer modulation of signals in a communication system.
Background
With the rapid development of mobile communication technology, resources such as space, time, frequency, antenna, etc. capable of carrying signals have been fully exploited and utilized. Both wired and wireless communication networks carry a strong demand for human interaction at overload. How to solve the continuously and rapidly increasing demand of communication services has become a troublesome problem for communication practitioners and organizations around the world today.
In order to solve the serious problem, researchers and organizations begin to explore and mine spectrum resources, such as power domains, degraded channel gains, and the like, which are not fully utilized, so as to improve the transmission capability of the existing communication network. And provides non-orthogonal multiple access, power division multiplexing and orthogonal power division multiplexing multiple access. These techniques require the transmitting end to map the data into multiple modulated signals, and then directly superimpose the multiple modulated signals together for transmission; and at a receiving end, sequentially demodulating the superposed multilayer signals by using a serial interference cancellation technology. The existing method for mapping the constellation diagram and directly superposing a plurality of modulation signals does not well establish the mapping relation between bit data and multilayer superposed signals, so that the demodulation of a receiving end faces the serious error accumulation problem and the demodulation performance is poor. Thus, the transmission performance of such systems is severely limited.
Disclosure of Invention
The invention aims to provide a method and a device for multi-layer modulation of signals in a communication system, which overcome the defects in the prior art, and the invention divides transmission data of a transmitting terminal into multiple information streams with transmission requirements, determines a matched modulation mode and constellation mapping for each information stream, and then combines and processes modulation signals according to the transmission requirements and channel states of the multiple information streams, thereby realizing efficient mapping of the data of the transmitting terminal from bits to multi-layer modulation signals, solving the problem that serial interference can not be effectively used to offset demodulation due to the mapping mismatch of the data and the multi-layer modulation signals in the prior communication system, and breaking through the bottleneck of low modulation performance in the prior communication system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for multi-layer modulation of signals in a communication system, comprising the steps of:
step 1: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;
step 2: determining a signal modulation mode for each information flow according to the transmission requirement of the plurality of information flows;
and step 3: setting constellation map for all modulation signals under each modulation mode;
and 4, step 4: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
and 5: combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirements and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and constellation map mapping of the communication system;
wherein, the transmission requirement of the information flow comprises: quality of service requirements of one or more services, or quality of service requirements of one or more users.
Further, the specific method for determining the modulation mode of the signal for each information stream in step 2 is as follows: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;
wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation.
Further, the specific method for setting the constellation map in step 3 is as follows:
setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of the bit code elements distributed by any two modulation signals is in direct proportion to the space distance of the constellation points of the two modulation signals on the constellation diagram.
Further, the specific method for combining the modulated signals of the multiple information streams in step 5 to generate the multilayer modulated signals and the constellation map of the communication system includes:
according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;
each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.
Further, the phase adjustment method specifically includes: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.
The device for multi-layer modulation of signals in a communication system comprises a data distribution module, wherein a modulation matching module is connected to the data distribution module, a constellation map module is connected to the modulation matching module, a signal generation module is connected to the constellation map module, and a multi-layer aliasing module is connected to the signal generation module; wherein:
the data distribution module: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;
a modulation matching module: determining a signal modulation mode for each information flow according to the transmission requirement of the plurality of information flows;
a constellation mapping module: setting constellation map for all modulation signals under each modulation mode;
a signal generation module: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
a multi-layer aliasing module: and combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirement and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and the constellation map mapping of the communication system.
Further, the specific method for determining the modulation mode of the signal for each channel of information stream in the modulation matching module is as follows: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;
wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation.
Further, the constellation mapping module specifically sets the constellation mapping as follows:
setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of the bit code elements distributed by any two modulation signals is in direct proportion to the space distance of the constellation points of the modulation signals on the constellation diagram.
Further, combining the modulation signals of the multiple information streams in the multilayer aliasing module to generate the multilayer modulation signals and the constellation map of the communication system specifically comprises:
according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;
each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.
Further, the phase adjustment in the multi-layer aliasing module is specifically: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.
Compared with the prior art, the invention has the following beneficial technical effects:
the method of the invention firstly divides the transmission data into a plurality of information streams with transmission requirements, then determines the matched modulation mode and constellation mapping for each information stream, and further carries out the combination processing mode of the modulation signals and the constellation mapping according to the transmission requirements and the channel state of the plurality of information streams, thereby realizing the high-efficiency mapping of the data of the transmitting terminal from the bit to the multilayer modulation signals under the condition of meeting the serial interference cancellation demodulation requirements, and breaking through the bottleneck of low performance of the multilayer modulation signals in the existing communication system.
The device divides data of a transmitting terminal into a plurality of information streams with transmission requirements through a data distribution module, sets a matched modulation mode for the plurality of information streams through a modulation matching module, determines proper constellation mapping for the modulation mode set by the modulation matching module through a constellation mapping module, generates a modulation signal through a signal generation module according to the constellation mapping determined by the constellation mapping module and the data in the information streams, combines the generated multi-path modulation signal and the constellation mapping through a multilayer aliasing module, realizes the high-efficiency generation of a multilayer modulation signal and the high-efficiency mapping of the transmitting terminal data and the multilayer modulation signal, and breaks through the bottleneck of low demodulation performance of the multilayer modulation signal when the conventional communication system meets the serial interference cancellation demodulation requirement.
Drawings
Fig. 1 is a flow chart of a signal multi-layer modulation method in a communication system of the present invention;
FIG. 2 is a schematic diagram of mapping and combining constellation diagrams according to the present invention;
fig. 3 is a block diagram of a signal multi-layer modulation apparatus in a communication system of the present invention.
Detailed Description
The embodiment of the invention provides a method for multi-layer modulation of signals in a communication system, which comprises the steps of dividing transmission data of a transmitting terminal into a plurality of information streams with transmission requirements, determining a matched modulation mode and constellation mapping for each information stream, and merging modulation signals and constellation mapping according to the transmission requirements and channel states of the plurality of information streams, so that efficient mapping of the data of the transmitting terminal from bits to multi-layer modulation signals is realized, the problem of difficult demodulation caused by mismatching of the data and the multi-layer modulation signals in the existing communication system is solved, and the bottleneck of low modulation performance in the existing communication system is broken through. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
Referring to fig. 1, a flowchart of a method for multi-layer modulation of signals in a communication system according to an embodiment of the present invention may include:
s101, dividing transmission data into multiple information streams with transmission requirements according to the transmission requirements of a communication system;
the following describes a method for dividing transmission data into multiple information streams with transmission requirements by taking a simple system as an example.
It is assumed that the transmission data of the system consists of two services to be served, denoted N respectively1And N2(ii) a The two services have respective quality of service requirements, respectively C1And C2。
The embodiment of the invention divides the transmission data into two information flows which are respectively expressed as X according to the service composition of the transmission data1And X2And setting the transmission requirements of the two information streams as C1And C2。
Similarly, for more than two waiting services, there is also a method of splitting into multiple information streams.
S102, determining a signal modulation mode for each information flow according to the transmission requirements of the plurality of information flows;
the specific method for determining the modulation mode of the signal for each path of information flow comprises the following steps: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;
wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation.
The following describes the determination of the signal modulation scheme in detail, taking a simple system as an example.
It is assumed that the transmission data of the system consists of two services to be served, denoted N respectively1And N2(ii) a The two services respectively need 2 bits per second and 1 bit per second transmission rates to meet the quality of service requirements; dividing the transmission data into two information streams, respectively denoted as X, according to the quality of service requirements of the transmission data1And X2And sets the transmission requirements of the two information streams to satisfy the transmission rates of 2 bits per second and 1 bit per second, respectively.
According to the transmission requirements of two information streams, the embodiment of the invention selects quaternary frequency shift keying modulation for the information stream needing 2 bits per second transmission rate, and selects binary frequency shift keying modulation for the information stream needing 1 bit per second transmission rate.
Similarly, for more than two information streams, there is also a method of determining multiple modulation schemes.
S103, setting constellation map for all modulation signals in each modulation mode;
the specific method for setting the constellation map comprises the following steps: setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of the bit code elements distributed by any two modulation signals is in direct proportion to the space distance of the constellation points of the modulation signals on the constellation diagram.
The constellation mapping setup is described in detail below by taking the simple system in S102 as an example.
Taking two information streams and two determined modulation modes in S102 as an example, the embodiment of the present invention is based on information stream X1The adopted quaternary frequency shift keying modulation sets the number of code elements to be 4, the length of the code elements to be 2, and four code words to be '00', '01', '10' and '11'; referring to fig. 2, according to the distribution of the constellation points of the four modulation signals on the constellation diagram in the quaternary frequency shift keying modulation, a codeword "00" is allocated to the constellation point in the first quadrant, a codeword "01" is allocated to the constellation point in the second quadrant, a codeword "11" is allocated to the constellation point in the third quadrant, and a codeword "10" is allocated to the constellation point in the fourth quadrant;
the embodiment of the invention is based on the information flow X2The binary frequency shift keying modulation is adopted, the number of code elements is set to be 2, the length of the code elements is 1, and two code words are respectively '0' and '1'; referring to fig. 2, according to the distribution of two modulation signals on constellation points in binary frequency shift keying modulation, code words "0" and "1" are respectively allocated to the two constellation points.
Similarly, for more than two information streams, there is also a method for setting constellation mapping for multiple modulation modes.
S104, generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
a method of generating a modulated signal for each information stream will be described in detail below by taking a simple system as an example.
Suppose that the system has two information flows, respectively denoted as X1And X2(ii) a Information stream X1The data to be transmitted is '100111', and the information stream X2The data to be transmitted is 11001; referring to FIG. 2, information flow X1Adopting quaternary frequency shift keying modulation, setting the mapping of a constellation diagram into bit code elements of constellation points on a first quadrant, a second quadrant, a third quadrant and a fourth quadrant, wherein the bit code elements are '00', '01', '11' and '10'; information stream X2The binary frequency shift keying modulation is adopted, and the bit code elements of two constellation points mapped on the abscissa axis by the constellation diagram are respectively '0' and '1'.
The embodiment of the invention maps the data to be transmitted of two information streams and the constellation diagram to obtain the information stream X1Generating a modulation signal matched with the fourth quadrant constellation point; for the information stream X2A modulation signal is generated that matches the constellation points on the negative real coordinate axis.
Similarly, for more than two information streams, different constellation point mappings and different data to be transmitted, there is also a method of generating a modulation signal for the information streams.
S105, combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirement and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and the constellation map mapping of the communication system;
the specific method for generating the multilayer modulation signal of the communication system comprises the following steps: according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;
each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; combining a plurality of bit code elements of each group of constellation points into a bit code element of a constellation point on a system constellation diagram to generate constellation diagram mapping of the system; the phase adjustment enables the modulation signals from the same information stream and the constellation points on the constellation map to adjust the same phase; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum;
a method for generating a multi-layer modulation signal of a communication system by combining a modulation signal of multiple information streams and constellation mapping is described in detail below by taking a simple system as an example.
Suppose that the system has two information flows, respectively denoted as X1And X2(ii) a The transmission requirements of the two information streams are to meet the transmission rates of 2 bits per second and 1 bit per second respectively; information stream X1Adopting quaternary frequency shift keying modulation, setting the mapping of a constellation diagram into bit code elements of constellation points on a first quadrant, a second quadrant, a third quadrant and a fourth quadrant, wherein the bit code elements are '00', '01', '11' and '10'; information stream X2The binary frequency shift keying modulation is adopted, and a constellation diagram is set to be mapped into bit code elements of two constellation points on positive and negative abscissa axes, namely '0' and '1'; after the data to be transmitted is mapped by the constellation diagram, the data is the information flow X1Generating a modulated signal matched to the constellation point of the fourth quadrant as an information stream X2Generating a modulation signal matched with the constellation point on the negative horizontal axis; the channel loss is 0.1 and the noise power is n.
The embodiment of the invention sets the information flow X according to the transmission requirement, the channel loss information and the noise power information1And information stream X2The transmitting power of the modulation signal is 60n and 10n respectively; from the information stream X1And information stream X2Respectively, to adjust the amplitude of the modulated signals to
And
to stream X of information1And information stream X2According to the amplitude of the constellation diagram of
And
adjusting; from the information stream X1And information stream X2The phases of the modulation signals are respectively adjusted to 0 degree and +45 degrees; to stream X of information1And information stream X2Adjusting the phase of a constellation point in a constellation diagram; referring to fig. 2, the two constellation diagrams after amplitude adjustment and phase adjustment are combined to generate a constellation diagram mapping of the system; superposing the two modulation signals to generate a multi-layer modulation signal of the system, wherein the multi-layer modulation signal corresponds to a constellation point with a bit code of '101' on a multi-layer modulation signal constellation diagram in the figure 2; referring to fig. 2, the bit code "101" on the multi-layer modulation signal constellation is the information stream X1Codeword "10" at quadrant constellation point and stream X2Direct combination of codewords "1" of constellation points on the negative horizontal axis;
the specific process of phase adjustment is as follows: when the information stream X1Is a modulated signal corresponding to a bit symbol "00", for an information stream X2Signal of (1) is rotated by-45 degrees; when the information stream X1Is a modulated signal corresponding to a bit symbol "01", for an information stream X2Signal rotation of-135 degrees; when the information stream X1Is a modulated signal corresponding to a bit symbol "11", for an information stream X2Signal rotation of 135 degrees; when the information stream X1Is a modulated signal corresponding to a bit symbol "10", for an information stream X2The signal in (1) is rotated by +45 degrees.
Similarly, for more than two information streams, different constellation point mappings and different data to be transmitted, there is also a method for generating a multi-layer modulation signal and constellation map mapping of a communication system.
According to the method for multi-layer modulation of the signals in the communication system, transmission data are firstly divided into multiple information streams with transmission requirements, then a matched modulation mode and constellation mapping are determined for each information stream, and the modulation signals and the constellation mapping are combined according to the transmission requirements and the channel state of the multiple information streams, so that efficient generation and mapping of the data of the transmitting end from bits to multi-layer modulation signals are realized, and the bottleneck that the multi-layer modulation signals are low in demodulation performance when the conventional communication system meets the serial interference cancellation demodulation requirements is broken through.
As shown in fig. 3, the structure diagram of the apparatus for multi-layer modulation of signals in a communication system according to an embodiment of the present invention includes:
the data distribution module: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;
a modulation matching module: determining a signal modulation mode for each information flow according to the transmission requirement of the plurality of information flows;
a constellation mapping module: setting constellation map for all modulation signals under each modulation mode;
a signal generation module: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
a multi-layer aliasing module: and combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirement and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and the constellation map mapping of the communication system.
In the embodiment of the present invention, the data splitting module 301 splits data at the transmitting end into multiple information streams with transmission requirements, the modulation matching module 302 sets a matching modulation mode for the multiple information streams, the constellation mapping module 303 determines a suitable constellation mapping for the modulation mode set by the modulation matching module 302, the signal generating module 304 generates a modulation signal according to the constellation mapping determined by the constellation mapping module and the data in the information streams, and the multilayer aliasing module 305 combines the generated multiple modulation signals and the constellation mapping, so as to implement efficient generation of multilayer modulation signals and efficient mapping of data to be transmitted and multilayer modulation signals, and break through a bottleneck of low performance of multilayer modulation signals in the existing communication system.
The method for determining the modulation mode of the signal for each channel of information stream in the modulation matching module specifically comprises the following steps: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream; wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation.
The constellation mapping module is configured with constellation mapping specifically as follows: setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of the bit code elements distributed by any two modulation signals is in direct proportion to the space distance of the constellation points of the modulation signals on the constellation diagram.
The combining of the modulation signals of the multiple information streams in the multilayer aliasing module to generate the multilayer modulation signal of the communication system specifically includes: according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system; each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream and represents a different multilayer modulation signal; combining a plurality of bit code elements of each group of constellation points into a bit code element of a constellation point on a system constellation diagram to generate constellation diagram mapping of the system; wherein, the phase adjustment in the multilayer aliasing module can adjust the modulation signal from the same information flow and the constellation point on the constellation diagram to the same phase; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.
The modules may be distributed in one device or may be distributed in a plurality of devices. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
The device for signal multi-layer modulation in the communication system can be independently arranged as a single device, and can also be integrated in the base station and the mobile terminal equipment.
According to the device for distributing uplink and downlink power of the multiple access system, the data distribution module 301 divides data at a transmitting end into multiple information streams with transmission requirements, the modulation matching module 302 sets a matched modulation mode for the multiple information streams, the constellation mapping module 303 determines a proper constellation mapping for the modulation mode set by the modulation matching module 302, the signal generation module 304 generates a modulation signal according to the constellation mapping determined by the constellation mapping module and the data in the information streams, the multilayer aliasing module 305 combines the generated multiple modulation signals and the constellation mapping, efficient generation of multilayer modulation signals and efficient mapping of data to be transmitted and the multilayer modulation signals are achieved, and the bottleneck that the demodulation performance of the multilayer modulation signals is low when the conventional communication system meets the requirements of serial interference cancellation and demodulation is broken through.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, a network device, etc.) to execute the method according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices of the embodiments can be distributed in the devices of the embodiments as described in the embodiments, and that corresponding changes can be made in one or more devices other than the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Claims (6)
1. A method for multi-layer modulation of signals in a communication system, comprising the steps of:
step 1: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;
step 2: determining a modulation mode of a signal for each information stream according to the transmission requirement of multiple information streams, wherein the specific method for determining the modulation mode of the signal for each information stream is as follows: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;
wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation;
and step 3: setting constellation map for all modulation signals under each modulation mode, wherein the specific method for setting the constellation map comprises the following steps:
setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of bit code elements distributed by any two modulation signals is in direct proportion to the space distance of constellation points of the two modulation signals on a constellation diagram;
and 4, step 4: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
and 5: combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirements and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and constellation map mapping of the communication system;
wherein, the transmission requirement of the information flow comprises: quality of service requirements of one or more services, or quality of service requirements of one or more users.
2. The method according to claim 1, wherein the step 5 of combining the modulated signals of the multiple information streams to generate the multi-layer modulated signals and the constellation mapping of the communication system comprises:
according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;
each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.
3. The method of multi-layer modulation of signals in a communication system according to claim 2, wherein the phase adjustment method is specifically: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.
4. The device for multi-layer modulation of signals in a communication system is characterized by comprising a data distribution module, wherein the data distribution module is connected with a modulation matching module, the modulation matching module is connected with a constellation map module, the constellation map module is connected with a signal generation module, and the signal generation module is connected with a multi-layer aliasing module; wherein:
the data distribution module: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;
a modulation matching module: determining a signal modulation mode for each information flow according to the transmission requirement of the plurality of information flows; the method for determining the modulation mode of the signal for each channel of information stream specifically comprises the following steps: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;
wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation;
a constellation mapping module: setting constellation map for all modulation signals under each modulation mode; the constellation map setting specifically comprises:
setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;
allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of bit code elements distributed by any two modulation signals is in direct proportion to the space distance of constellation points of the modulation signals on a constellation diagram;
a signal generation module: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;
a multi-layer aliasing module: and combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirement and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and the constellation map mapping of the communication system.
5. The apparatus for multi-layer modulation of signals in a communication system according to claim 4, wherein the multi-layer aliasing module combines the modulated signals of the multiple information streams to generate the multi-layer modulated signals and the constellation map of the communication system specifically comprises:
according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;
each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.
6. The apparatus for multi-layer modulation of a signal in a communication system as claimed in claim 5, wherein the phase adjustment in the multi-layer aliasing module is specifically: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.
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