CN105991508A - 8QAM modulation method and system thereof - Google Patents

8QAM modulation method and system thereof Download PDF

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Publication number
CN105991508A
CN105991508A CN201610318866.6A CN201610318866A CN105991508A CN 105991508 A CN105991508 A CN 105991508A CN 201610318866 A CN201610318866 A CN 201610318866A CN 105991508 A CN105991508 A CN 105991508A
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8qam
constellation point
signal
coded data
bit
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余佳
李名
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SHENZHEN GREAT FIRST TECHNOLOGY Co Ltd
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SHENZHEN GREAT FIRST TECHNOLOGY Co Ltd
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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
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

The invention provides a 8QAM modulation method comprising the steps that digital signals generated by a signal source are coded so as to form the coded data; the serial bit stream of the coded data is converted into horizontal components and vertical components through 8QAM bit constellation point mapping; and the converted horizontal components and the vertical components are correspondingly modulated on two mutually orthogonal carriers by using an amplitude modulation mode so as to form orthogonal modulation signals. The invention also provides a 8QAM modulation system. According to the technical scheme, the total number of bit errors of a transmission system of which the spectral efficiency is equal to 3bit/s/Hz is enabled to be minimized so that the performance of the whole digital communication system can be enhanced.

Description

A kind of 8QAM modulator approach and system thereof
Technical field
The present invention relates to digital communicating field, particularly relate to a kind of 8QAM modulator approach and system thereof.
Background technology
At digital communicating field, signal was typically necessary before sending and carries out signal modulation, quadrature amplitude modulation Mode (QAM) is a kind of modulation system, and data signal is represented by the amplitude of variation of two mutually orthogonal carrier waves.QAM is a kind of Vector Modulation, first maps on (typically using Gray code) to one complex plane (constellation) by input bit, forms complex modulation symbol Number, then by the I of symbol, Q component, (real part of corresponding complex plane and imaginary part the most both horizontally and vertically) use amplitude to adjust System, respectively corresponding modulating mutually orthogonal (time domain orthogonal) two carrier waves (with) on.QAM is amplitude, phase combining modulation Technology, it make use of simultaneously the amplitude of carrier wave and phase place to transmit information bit, therefore can under conditions of minimum range is identical Realizing higher band efficiency, sampling point number is the most, and its efficiency of transmission is the highest.
The most generally using the more spectrum efficiency transmission system equal to 3bit/s/Hz is eight phase shift keying modulation modes (8PSK), but this modulation system exists into limit of locking a door higher, the defect that transmission performance is poor.Therefore, design one is needed badly Reduce into the brand-new modulation system limiting and improving transmission performance of locking a door.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of 8QAM modulator approach and system thereof, it is intended to solve existing skill The limit that enters in art to lock a door is higher, the problem that transmission performance is poor.
The present invention proposes a kind of 8QAM modulator approach, and described modulator approach includes:
To encoding digital signals produced by signal source to form coded data；
Mapped by 8QAM bit constellation point, by the serial bit stream (b of described coded data3i,b3i+1,b3i+2) conversion For horizontal component I (i) and vertical component Q (i), wherein i=0,1,2,3 ...；The following institute of 8QAM bit constellation point mapping mode Show:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) ;
Described horizontal component and described vertical component after using amplitude modulation(PAM) mode to change distinguish corresponding modulating in phase To form orthogonal demodulation signal on two the most orthogonal carrier waves.
Preferably, described concrete with the step forming coded data to encoding digital signals produced by signal source Including:
To needing the digital signal that sends produced by signal source, channel coding method is utilized to carry out encoding and compile to be formed Code data.
Preferably, described modulator approach also includes:
Power amplifier is utilized to amplify described orthogonal demodulation signal；
Signal transmission after described power amplifier amplifies is launched to antenna.
On the other hand, the present invention also provides for a kind of 8QAM modulating system, and described modulating system includes:
Coding module, is used for encoding digital signals produced by signal source to form coded data；
Mapping block, for mapping by 8QAM bit constellation point, by the serial bit stream (b of described coded data3i, b3i+1,b3i+2) be converted to horizontal component I (i) and vertical component Q (i), wherein i=0,1,2,3 ...；8QAM bit constellation point reflects Penetrate mode as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) ;
Modulation module, for using amplitude modulation(PAM) mode by the described horizontal component after conversion and described vertical component difference Corresponding modulating on two mutually orthogonal carrier waves to form orthogonal demodulation signal.
Preferably, described coding module specifically for:
To needing the digital signal that sends produced by signal source, channel coding method is utilized to carry out encoding and compile to be formed Code data.
Preferably, described modulating system also includes:
Amplification module, is used for utilizing power amplifier to amplify described orthogonal demodulation signal；
Transmitter module, for launching the signal transmission after described power amplifier amplifies to antenna.
The technical scheme that the present invention provides uses 8QAM bit constellation point to map, in the case of spectrum efficiency is identical, its The constellation point constellation point than 8PSK is more dispersed, and the distance between constellation point is bigger, and the limit that enters to lock a door is lower, the transporting obtained Can be more preferably.
Accompanying drawing explanation
Fig. 1 is 8QAM modulator approach flow chart in an embodiment of the present invention；
Fig. 2 is the transition diagram of step S12 shown in Fig. 1 in an embodiment of the present invention；
Fig. 3 is that in an embodiment of the present invention, 8QAM bit constellation point maps schematic diagram；
Fig. 4 is the flow diagram of 8QAM modulator approach in an embodiment of the present invention；
Fig. 5 is the internal structure schematic diagram of 8QAM modulating system 10 in an embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and It is not used in the restriction present invention.
The specific embodiment of the invention provides a kind of 8QAM modulator approach, mainly comprises the steps:
S11, to encoding digital signals produced by signal source to form coded data；
S12, by 8QAM bit constellation point map, the serial bit stream of described coded data is converted to horizontal component And vertical component；
S13, use amplitude modulation(PAM) mode by the described horizontal component after conversion and described vertical component respectively corresponding modulating To form orthogonal demodulation signal on two mutually orthogonal carrier waves.
A kind of 8QAM modulator approach that the present invention provides uses 8QAM bit constellation point to map, in the feelings that spectrum efficiency is identical Under condition, its constellation point constellation point than 8PSK is more dispersed, and the distance between constellation point is bigger, and the limit that enters to lock a door is lower, obtains Transmission performance more preferable.
Hereinafter a kind of 8QAM modulator approach provided by the present invention will be described in detail.
Refer to Fig. 1, for 8QAM modulator approach flow chart in an embodiment of the present invention.
In step s 11, to encoding digital signals produced by signal source to form coded data.
In the present embodiment, digital communication system generally comprises transmitter, communication channel, receiver three parts, its In, transmitter section includes signal source, and signal source is for producing the digital signal needing to send；Transmitter section also includes channel Coding, for the encoding digital signals needing transmission produced by signal source.
In the present embodiment, described to encoding digital signals produced by signal source to form coded data Step S11 specifically includes:
To needing the digital signal that sends produced by signal source, channel coding method is utilized to carry out encoding and compile to be formed Code data.
In step s 12, mapped by 8QAM bit constellation point, the serial bit stream of described coded data is converted to Horizontal component and vertical component.
In the present embodiment, transmitter section also includes that bit constellation point maps, and mainly includes 8QAM (Quadrature Amplitude Modulation) mapping of bit constellation point, each symbol period of 8QAM transmits 3 bits, namely frequency spectrum effect Rate is equal to 3bit/s/Hz.
In the present embodiment, mapped by 8QAM bit constellation point, by the serial bit stream of described coded data (b3i,b3i+1,b3i+2) be converted to horizontal component I (i) and vertical component Q (i), wherein i=0,1,2,3 ...；；8QAM bit star Seat point mapping mode is as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) .
In the present embodiment, the transition diagram of step S12 is as shown in Figure 2.
Refer to Fig. 2, show the transition diagram of step S12 shown in Fig. 1 in an embodiment of the present invention.
In the present embodiment, mapped by bit constellation point, i.e. utilize 8QAM bit constellation point to map, by encoded Serial bit stream (b3i,b3i+1,b3i+2) be converted to horizontal component and vertical component (i.e. IQ amplitude I (i) and Q (i) of constellation point). In the present embodiment, quadrature amplitude modulation (QAM) is a kind of Vector Modulation, and input bit is first mapped and (typically uses lattice by it Thunder code) on a complex plane (i.e. constellation), form complex modulation symbols, then by (the most right to the I of complex modulation symbols, Q component Answer real part and the imaginary part of complex plane, the most horizontally and vertically) use amplitude modulation(PAM).
Please continue to refer to Fig. 1, in step s 13, use amplitude modulation(PAM) mode by the described horizontal component after conversion and institute State vertical component respectively corresponding modulating on two mutually orthogonal carrier waves to form orthogonal demodulation signal.
In the present embodiment, use amplitude modulation(PAM) by the most right to the described horizontal component after conversion and described vertical component Should be modulated on two carrier waves (cos (ω t) and sin (ω t)) of mutually orthogonal (i.e. referring to time domain orthogonal).
In the present embodiment, described modulator approach also includes:
Power amplifier is utilized to amplify described orthogonal demodulation signal；
Signal transmission after described power amplifier amplifies is launched to antenna.
In the present embodiment, QAM be amplitude, phase combining modulation technology, it make use of simultaneously carrier wave amplitude and Phase place transmits information bit, therefore can realize higher band efficiency, sampling point number under conditions of minimum range is identical The most, its efficiency of transmission is the highest, such as, have the 8QAM signal of 8 sampling points, and each sampling point represents a kind of vector state, and 8QAM has 8 states, every 3 bits define the state in 8 states, define 8 kinds of carrier waves and the combination of phase place in 8QAM, and 8QAM's is each Symbol and cycle transmit 3 bits, and namely spectrum efficiency is equal to 3bit/s/Hz.But, in phase keying modulation (PSK), The spectrum efficiency of 8PSK is also equal to 3bit/s/Hz, compares the constellation point of 8PSK, the 8QAM constellation point than 8PSK more dispersed, 8QAM Constellation point between distance bigger, the limit that enters to lock a door is lower, and transmission performance is more preferable.
In the present embodiment, 8QAM bit constellation point maps as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 )
A coordinate constellations point diagram is depicted, as shown in Figure 3 according to mapping mode above.
Refer to Fig. 3, show 8QAM bit constellation point in an embodiment of the present invention and map schematic diagram.
A kind of 8QAM modulator approach that the present invention provides uses 8QAM bit constellation point to map, in the feelings that spectrum efficiency is identical Under condition, its constellation point constellation point than 8PSK is more dispersed, and the distance between constellation point is bigger, and the limit that enters to lock a door is lower, obtains Transmission performance more preferable.
Refer to Fig. 4, show the flow diagram of 8QAM modulator approach in an embodiment of the present invention.
The specific embodiment of the invention also provides for a kind of 8QAM modulating system 10, specifically includes that
Coding module 11, is used for encoding digital signals produced by signal source to form coded data；
Mapping block 12, for being mapped by 8QAM bit constellation point, is circulated the serial data of described coded data It is changed to horizontal component and vertical component；
Modulation module 13, for using amplitude modulation(PAM) mode the described horizontal component after conversion and described vertical component to be divided Other corresponding modulating on two mutually orthogonal carrier waves to form orthogonal demodulation signal.
A kind of 8QAM modulating system 10 that the present invention provides, uses 8QAM bit constellation point to map, identical in spectrum efficiency In the case of, its constellation point constellation point than 8PSK is more dispersed, and the distance between constellation point is bigger, and the limit that enters to lock a door is lower, The transmission performance obtained is more preferable.
Refer to Fig. 5, show the structural representation of 8QAM modulating system 10 in an embodiment of the present invention.In this enforcement In mode, 8QAM modulating system 10 mainly includes coding module 11, mapping block 12 and modulation module 13.
Coding module 11, is used for encoding digital signals produced by signal source to form coded data.
In the present embodiment, coding module 11 specifically for: to need produced by signal source send digital signal, Channel coding method is utilized to carry out encoding to form coded data.
Mapping block 12, for being mapped by 8QAM bit constellation point, is circulated the serial data of described coded data It is changed to horizontal component and vertical component.
In the present embodiment, described 8QAM bit constellation point maps and includes that 8QAM bit constellation point maps, and 8QAM's is every Individual symbol period transmits 3 bits, and namely spectrum efficiency is equal to 3bit/s/Hz.
In the present embodiment, mapping block 12 is for mapping by 8QAM bit constellation point, by described coded data Serial bit stream (b3i,b3i+1,b3i+2) be converted to horizontal component I (i) and vertical component Q (i), wherein i=0,1,2, 3……；；8QAM bit constellation point mapping mode is as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) .
Modulation module 13, for using amplitude modulation(PAM) mode the described horizontal component after conversion and described vertical component to be divided Other corresponding modulating on two mutually orthogonal carrier waves to form orthogonal demodulation signal.
In the present embodiment, in addition to three above main modular, 8QAM modulating system 10 also includes:
Amplification module, is used for utilizing power amplifier to amplify described orthogonal demodulation signal；
Transmitter module, for launching the signal transmission after described power amplifier amplifies to antenna.
A kind of 8QAM modulating system 10 that the present invention provides, uses 8QAM bit constellation point to map, identical in spectrum efficiency In the case of, its constellation point constellation point than 8PSK is more dispersed, and the distance between constellation point is bigger, and the limit that enters to lock a door is lower, The transmission performance obtained is more preferable.
It should be noted that in above-described embodiment, included unit is to carry out dividing according to function logic, But it is not limited to above-mentioned division, as long as being capable of corresponding function；It addition, the specific name of each functional unit is also Only to facilitate mutually distinguish, it is not limited to protection scope of the present invention.
It addition, one of ordinary skill in the art will appreciate that all or part of step realizing in the various embodiments described above method The program that can be by completes to instruct relevant hardware, and corresponding program can be stored in an embodied on computer readable storage and be situated between In matter, described storage medium, such as ROM/RAM, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.

Claims (6)

1. a 8QAM modulator approach, it is characterised in that described modulator approach includes:
To encoding digital signals produced by signal source to form coded data；
Mapped by 8QAM bit constellation point, by the serial bit stream (b of described coded data3i,b3i+1,b3i+2) be converted to water The amount of dividing equally I (i) and vertical component Q (i), wherein i=0,1,2,3 ..., 8QAM bit constellation point mapping mode is as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) ;
Described horizontal component and described vertical component after using amplitude modulation(PAM) mode to change distinguish corresponding modulating the most just Hand over two carrier waves on to form orthogonal demodulation signal.
2. 8QAM modulator approach as claimed in claim 1, it is characterised in that described digital signal produced by signal source is entered Row coding specifically includes with the step forming coded data:
To needing the digital signal that sends produced by signal source, channel coding method is utilized to carry out encoding being formed encoded According to.
3. 8QAM modulator approach as claimed in claim 1, it is characterised in that described modulator approach also includes:
Power amplifier is utilized to amplify described orthogonal demodulation signal；
Signal transmission after described power amplifier amplifies is launched to antenna.
4. a 8QAM modulating system, it is characterised in that described modulating system includes:
Coding module, is used for encoding digital signals produced by signal source to form coded data；
Mapping block, for mapping by 8QAM bit constellation point, by the serial bit stream (b of described coded data3i,b3i+1, b3i+2) be converted to horizontal component I (i) and vertical component Q (i), wherein i=0,1,2,3 ..., 8QAM bit constellation point mapping side Formula is as follows:
( I ( i ) , Q ( i ) ) = ( - 3 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 0 ) ( - 1 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 0 , 1 ) ( - 3 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 0 ) ( 1 , 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 0 , 1 , 1 ) ( - 1 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 0 ) ( 1 , - 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 0 , 1 ) ( 3 , - 3 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 0 ) ( 3 , 1 ) , ( b 3 i , b 3 i + 1 , b 3 i + 2 ) = ( 1 , 1 , 1 ) ;
Modulation module, for using amplitude modulation(PAM) mode that the described horizontal component after conversion is the most corresponding with described vertical component It is modulated on two mutually orthogonal carrier waves to form orthogonal demodulation signal.
5. 8QAM modulating system as claimed in claim 4, it is characterised in that described coding module specifically for:
To needing the digital signal that sends produced by signal source, channel coding method is utilized to carry out encoding being formed encoded According to.
6. 8QAM modulating system as claimed in claim 4, it is characterised in that described modulating system also includes:
Amplification module, is used for utilizing power amplifier to amplify described orthogonal demodulation signal；
Transmitter module, for launching the signal transmission after described power amplifier amplifies to antenna.
CN201610318866.6A 2016-05-13 2016-05-13 8QAM modulation method and system thereof Pending CN105991508A (en)

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CN108809885A (en) * 2018-04-27 2018-11-13 中国矿业大学 A kind of novel orthogonal space modulator approach based on indoor visible light communication
CN109756275A (en) * 2017-11-03 2019-05-14 深圳市中兴微电子技术有限公司 A kind of demodulation method and demodulating equipment
CN112333127A (en) * 2020-10-30 2021-02-05 中北大学 Ratioless safety coding method based on Spinal code
CN112491766A (en) * 2020-12-24 2021-03-12 深圳市鼎阳科技股份有限公司 Digital modulation method and device, and storage medium

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CN103391269A (en) * 2013-08-02 2013-11-13 深圳市统先科技股份有限公司 8 QAM (quadrature amplitude modulation) receiver and method for extracting local carrier phase error by 8QAM receiver
CN103916216A (en) * 2014-03-24 2014-07-09 重庆邮电大学 QC-LDPC coded modulation method based on 8-QAM modulation mode in optical communication system

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US20130170841A1 (en) * 2011-12-30 2013-07-04 Alcatel-Lucent Usa Method and apparatus for transmitting high-level qam optical signals with binary drive signals
CN103391269A (en) * 2013-08-02 2013-11-13 深圳市统先科技股份有限公司 8 QAM (quadrature amplitude modulation) receiver and method for extracting local carrier phase error by 8QAM receiver
CN103916216A (en) * 2014-03-24 2014-07-09 重庆邮电大学 QC-LDPC coded modulation method based on 8-QAM modulation mode in optical communication system

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Publication number Priority date Publication date Assignee Title
CN109756275A (en) * 2017-11-03 2019-05-14 深圳市中兴微电子技术有限公司 A kind of demodulation method and demodulating equipment
CN109756275B (en) * 2017-11-03 2021-10-15 深圳市中兴微电子技术有限公司 Demodulation method and demodulation device
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CN108809885B (en) * 2018-04-27 2021-07-23 中国矿业大学 Novel space orthogonal modulation method based on indoor visible light communication
CN112333127A (en) * 2020-10-30 2021-02-05 中北大学 Ratioless safety coding method based on Spinal code
CN112333127B (en) * 2020-10-30 2023-09-08 中北大学 Spinal code-based rateless safety coding method
CN112491766A (en) * 2020-12-24 2021-03-12 深圳市鼎阳科技股份有限公司 Digital modulation method and device, and storage medium

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Application publication date: 20161005