CN101340411B - Method for amplitude modulation and transmitter - Google Patents
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Abstract
The invention discloses an amplitude modulation method and a transmitter. The method of the invention comprises the steps as follows: a base-band signal and a carrier signal are received; the first amplitude modulation is carried out on the received base-band signal and the carrier signal, and a first amplitude modulation result is output; error treatment is carried out on the first amplitude modulation result and a feedback signal, and an error feedback control signal is output; the received carrier signal is amplified, and the carrier signal after the amplification is output; the second amplitude modulation is carried out on the carrier signal which is amplified and the error feedback control signal, and an amplitude modulated wave signal is output; the amplitude modulated wave signal is coupled, and the coupled result is output as a feedback signal for error treatment. A power amplification circuit and a feedback control circuit are combined by the invention, thereby reducing power loss, reducing distortion during the modulation process and improving the linearity of the output amplitude modulated wave signal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an amplitude modulation method and a transmitter.
Background
Improving system efficiency and reducing power consumption are always pursued goals of wireless communication systems. In practical communication systems, it is often necessary to obtain a high-power amplitude modulated wave signal, and there are two ways to implement this: firstly, carrying out amplitude modulation on a signal, and then amplifying the signal by a power amplifier tube to obtain a high-power amplitude modulated wave signal; the other method is to directly use the power amplifier tube to perform amplitude modulation on the signal, and the common method is to perform collector amplitude modulation on the power amplifier tube. In any way, the participation of the power amplifier cannot be avoided, so that the power loss of the system is closely related to the efficiency of the power amplifier.
In the prior art, an amplitude modulated wave signal with high power is obtained by adopting a structure of firstly modulating amplitude and then amplifying in a communication system, as shown in fig. 1, a baseband signal is subjected to amplitude modulation and band-pass filtering to obtain an amplitude modulated signal, and at the moment, the signal amplitude of the amplitude modulated wave signal is still very small, so that the amplitude modulated signal with high power needs to be obtained through a power amplifier. The amplitude modulation part is generally implemented by using an analog multiplier amplitude modulation circuit, and specifically, as shown in fig. 2, a modulation signal f (t) is added to a direct current signal l to obtain a signal l + f (t), a signal l + f (t) and a carrier signal Vcmcosw0t passage coefficient of KmThe multiplier performs multiplication operation and then obtains amplitude modulated wave signal K through band-pass filteringmVcm[l+f(t)]cosw0t. The amplitude modulated wave signal can be amplified by a power amplifier to generate a high-power amplitude modulated wave signal for wireless transmission.
During the research and practice of the prior art, the inventor finds that at least the following problems exist in the prior art: the levels of the input carrier signal and the baseband signal are limited, and the structure can not directly use a high-efficiency power amplifier (such as E-type power) to complete amplitude modulation, so that the system efficiency is difficult to improve.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an amplitude modulation method and apparatus thereof, which can improve the system efficiency in the amplitude modulation process and reduce the power loss.
In order to solve the technical problems, the invention is realized by the following technical scheme:
one embodiment of the present invention provides a transmitter for receiving a carrier signal and a baseband signal, the transmitter comprising:
power amplifier unit, first amplitude modulation unit, coupling unit, error processing unit, second amplitude modulation unit, wherein:
the power amplification unit is used for amplifying the received carrier signal to obtain an amplified carrier signal;
the first amplitude modulation unit is used for carrying out amplitude modulation on the received baseband signals and carrier signals and outputting a first amplitude modulation result;
the coupling unit is used for coupling the amplitude modulated wave signal output by the second amplitude modulation unit and outputting a coupling result, wherein the coupling result is the attenuation K times of the amplitude modulated wave signal, and K is the amplification factor of the power amplification unit;
the error processing unit is configured to perform error processing on the first amplitude modulation result output by the first amplitude modulation unit and the coupling result output by the coupling unit to obtain an error feedback control signal; the error processing unit includes: the error extraction unit is used for comparing the coupling result output by the coupling unit with the first amplitude modulation result output by the first amplitude modulation unit to obtain an error signal; a baseband signal demodulation unit, configured to demodulate the error signal according to the received carrier signal to obtain a baseband error signal; the amplitude error integrating unit is used for carrying out integration summation on the fundamental frequency error signal to obtain an error feedback control signal;
and the second amplitude modulation unit is used for carrying out amplitude modulation on the carrier signal amplified by the power amplification unit and the error feedback control signal and outputting an amplitude modulated wave signal.
Another embodiment of the present invention provides a method of amplitude modulation, including:
receiving a baseband signal and a carrier signal;
carrying out first amplitude modulation on the received baseband signal and the carrier signal, and outputting a first amplitude modulation result;
performing error processing on the first amplitude modulation result and the feedback signal, and outputting an error feedback control signal, wherein the error processing includes comparing the feedback signal with the first amplitude modulation output result to obtain an error signal; demodulating the error signal according to the received carrier signal to obtain a fundamental frequency error signal; carrying out integral summation on the fundamental frequency error signal to obtain an error feedback control signal;
amplifying the received carrier signal and outputting the amplified carrier signal;
carrying out secondary amplitude modulation on the amplified carrier signal and the error feedback control signal, and outputting an amplitude modulated wave signal;
and coupling the amplitude modulated wave signal, outputting a coupling result as a feedback signal for error processing, wherein the coupling result is attenuation K times of the amplitude modulated wave signal, and K is the amplification multiple.
Above technical scheme can see that, because when carrying out signal modulation, through combining power amplifier circuit and feedback control circuit, adopt high efficiency power amplifier (for example E type power amplifier) circuit through enlargiing the carrier signal of input, improve entire system's efficiency, combine feedback control circuit simultaneously for the distortion in the modulation process reduces, realizes high efficiency linear amplitude modulation, has improved entire system's efficiency, has reduced power loss.
Drawings
Fig. 1 is a schematic diagram of an amplitude modulation structure provided in the prior art;
FIG. 2 is a schematic diagram of an analog multiplier provided in the prior art for implementing a common amplitude wave modulation;
FIG. 3 is a schematic diagram of an apparatus provided in accordance with an embodiment of the present invention;
fig. 4 is a flowchart of a method provided by another embodiment of the present invention.
Detailed Description
The embodiment of the invention provides an amplitude modulation method and a transmitter, which are used for combining a high-efficiency power amplifier (such as an E-type power amplifier) circuit with a feedback control circuit when acquiring a high-power amplitude modulation wave signal to realize high-efficiency linear amplitude modulation so as to reduce power loss in a wireless communication system.
In order to make the technical scheme of the invention more clear, the following embodiments are listed for detailed description:
one embodiment of the present invention provides a transmitter for receiving a carrier signal and a baseband signal (in this embodiment, the received baseband signal is <math><mrow><msub><mi>v</mi><mi>Ω</mi></msub><mo>=</mo><mover><msub><mi>v</mi><mi>Ω</mi></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mi>Ω</mi></msub><mi>t</mi><mo>,</mo></mrow></math> The received carrier signal is <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi><mo>,</mo></mrow></math> 
Which represents the amplitude of the baseband signal and,representing the amplitude, omega, of the carrier signalΩRepresenting the modulation frequency, ω0Representing carrier angular frequency) as shown in fig. 3, includes:
a power amplifier unit 101, a first amplitude modulation unit 102, a coupling unit 103, an error processing unit 104, and a second amplitude modulation unit 105, wherein:
the power amplifier unit 101 is configured to amplify the received carrier signal to obtain an amplified carrier signal. In this embodiment, the received carrier signal <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Inputting the carrier signal to a power amplifier unit 101, and amplifying the carrier signal by the power amplifier unit 101 <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Amplifying to obtain a carrier signal v with larger amplitude0′＝Kv0cosω0t. It will be appreciated that the power amplifier unit is a high efficiency power amplifier, for example a class E amplifier. Wherein,
representing the amplitude of the carrier signal, K representing the amplification factor, omega0Representing the carrier angular frequency.
The first amplitude modulation unit 102 is configured to perform amplitude modulation on the received baseband signal and carrier signal, and output a first amplitude modulation result.
In the present embodiment, the first amplitude modulation unit 102 performs demodulation on the received baseband signal <math><mrow><msub><mi>v</mi><mi>Ω</mi></msub><mo>=</mo><mover><msub><mi>v</mi><mi>Ω</mi></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mi>Ω</mi></msub><mi>t</mi><mo>,</mo></mrow></math> And carrier wave signal <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Performing a first amplitude modulation to generate a first amplitude modulation result A ═ V'cm(1+macosωΩt)cosω0t (amplitude modulated wave signal). Wherein,
which represents the amplitude of the baseband signal and,
representing the amplitude, V ', of the carrier signal'cmRepresenting the output carrier amplitude, maRepresenting the modulation index, ωΩRepresenting the modulation frequency, ω0Representing the carrier angular frequency.
The coupling unit 103 is configured to couple the amplitude modulated wave signal output by the second amplitude modulation unit 105, and output a coupling result.
For example, the amplitude modulated wave signal output by the second amplitude modulation unit 105 is: KVcm(1+macosωΩt)cosω0t, the amplitude modulated wave signal B is coupled by the coupling means 103, and a coupling result C is obtained as B/K (i.e., a feedback signal) and output. Wherein K represents a magnification factor, VcmRepresenting the linear output carrier amplitude, maRepresenting the modulation index, ωΩRepresenting the modulation frequency, ω0Representing the carrier angular frequency.
An error processing unit 104, configured to perform error processing on the first amplitude modulation result output by the first amplitude modulation unit 102 and the coupling result output by the coupling unit 103, so as to obtain an error feedback control signal.
In this embodiment, the first amplitude modulation result a ═ V 'output to the first amplitude modulation section 102'cm(1+macosωΩt)cosω0t and the coupling result C output by the coupling unit 103 are subjected to error processing to obtain an error feedback control signal Er ═ Σ Er · cos Ω t.
And a second amplitude modulation unit 105, configured to perform amplitude modulation on the carrier signal amplified by the power amplification unit 101 and the error feedback control signal, and output an amplitude modulated wave signal.
In this embodiment, the error feedback control signal Er generated by the error processing unit 104 and the carrier signal v amplified by the power amplifier unit 101 are ═ Σ Er · cos Ω t0′＝Kv0cosω0t is input to the second amplitude modulation unit 105 for amplitude modulation, and an amplitude modulated wave signal B with high power is generatedcm(1+macosωΩt)cosω0t, it can be understood that the result of the coupling of the amplitude modulated wave signal B by the coupling unit 103 is a feedback signal.
In this embodiment, the error processing unit 104 includes:
an error extracting unit 106, configured to compare the coupling result output by the coupling unit 103 with the first amplitude modulation result output by the first amplitude modulating unit 102, so as to obtain an error signal.
For example, error extraction section 106 compares first amplitude modulation result a with coupling result C to obtain error signal error — C-a. It is understood that the error signal error at this time has a structural form of an amplitude modulated wave signal.
The baseband signal demodulation unit 107 is configured to demodulate the error signal according to the received carrier signal to obtain a baseband error signal.
For example, the baseband signal demodulation unit 107 demodulates the obtained error signal error. This part can be implemented using multiplication principles, for example using multipliers or quadrature modulators, etc.
Carrier signal to be received <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Multiplying the error signal error, and filtering the multiplication result to obtain a base frequency error signal with a base band signal frequency omega <math><mrow><mi>er</mi><mo>=</mo><mover><mi>er</mi><mo>·</mo></mover><mo>·</mo><mi>cos</mi><mi>Ωt</mi><mo>,</mo></mrow></math> Wherein
Representing the amplitude of the error signal.
And the amplitude error integrating unit 108 is configured to perform integration and summation on the fundamental frequency error signal to obtain an error feedback control signal.
For example, the fundamental frequency error signal is integrated by the amplitude error integration unit <math><mrow><mi>er</mi><mo>=</mo><mover><mi>er</mi><mo>·</mo></mover><mo>·</mo><mi>cos</mi><mi>Ωt</mi></mrow></math> And performing integral summation to obtain an error feedback control signal Er ═ Σ Er · cos Ω t.
In this embodiment, the baseband signal demodulation unit 107 includes:
a multiplication unit for multiplying the received carrier signal by the error signal and outputting a multiplication result;
and the filtering unit is used for filtering the multiplication result output by the multiplication unit to obtain the fundamental frequency error signal.
In this embodiment, a high-efficiency power amplifier (e.g., class E power amplifier) functional unit is combined with a feedback control functional unit, and the high-efficiency power amplifier (e.g., class E power amplifier) functional unit amplifies an input carrier signal to improve the efficiency of the entire system.
Another embodiment of the present invention provides a method of amplitude modulation, see fig. 4, comprising:
s201: a baseband signal and a carrier signal are received. For example, receiving baseband signals <math><mrow><msub><mi>v</mi><mi>Ω</mi></msub><mo>=</mo><mover><msub><mi>v</mi><mi>Ω</mi></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mi>Ω</mi></msub><mi>t</mi><mo>,</mo></mrow></math> And carrier signal without amplification <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi><mo>.</mo></mrow></math>
S202: the baseband signal and the carrier signal received in S201 are subjected to first amplitude modulation, and a first amplitude modulation result is output.
In the present embodiment, the received baseband signal is processed <math><mrow><msub><mi>v</mi><mi>Ω</mi></msub><mo>=</mo><mover><msub><mi>v</mi><mi>Ω</mi></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mi>Ω</mi></msub><mi>t</mi><mo>,</mo></mrow></math> And carrier wave signal <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Performing a first amplitude modulation to generate a first amplitude modulation result A ═ V'cm(1+macosωΩt)cosω0t. Wherein,
which represents the amplitude of the baseband signal and,
representing the amplitude, V ', of the carrier signal'cmRepresenting the output carrier amplitude, maRepresenting the modulation index, ωΩRepresenting the modulation frequency, ω0Representing the carrier angular frequency.
S203: and carrying out error processing on the first amplitude modulation result and the feedback signal, and outputting an error feedback control signal.
In this embodiment, the first amplitude modulation result a is compared with the feedback signal C to obtain the error signal error — C-a. It is understood that the error signal error at this time has a structural form of an amplitude modulated wave signal.
Based on received carrier signals <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Demodulating the error signal error to obtain a fundamental frequency error signal;
this part can be implemented using multiplication principles, for example using multipliers or quadrature modulators, etc.
Carrier signal to be received <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><mover><msub><mi>v</mi><mn>0</mn></msub><mo>·</mo></mover><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Multiplying the error signal error by the error signal error, outputting the multiplication result, and filtering the multiplication result to obtain a base frequency error signal having a base band signal frequency omega <math><mrow><mi>er</mi><mo>=</mo><mover><mi>er</mi><mo>·</mo></mover><mo>·</mo><mi>cos</mi><mi>Ωt</mi><mo>,</mo></mrow></math> Wherein
Representing the amplitude of the error signal.
For the base frequency error signal <math><mrow><mi>er</mi><mo>=</mo><mover><mi>er</mi><mo>·</mo></mover><mo>·</mo><mi>cos</mi><mi>Ωt</mi></mrow></math> And performing integral summation to obtain an error feedback control signal Er ═ Σ Er · cos Ω t.
S204: and amplifying the carrier signal received in the step S201, and outputting the amplified carrier signal.
In this embodiment, a high frequency carrier signal <math><mrow><msub><mi>v</mi><mn>0</mn></msub><mo>=</mo><msub><mover><mi>v</mi><mo>.</mo></mover><mn>0</mn></msub><mi>cos</mi><msub><mi>ω</mi><mn>0</mn></msub><mi>t</mi></mrow></math> Inputting an E-type power amplification unit, amplifying the high-frequency carrier signal by the E-type power amplification unit to obtain a carrier signal v with larger amplitude0′＝Kv0cosω0t。
S205: and performing second amplitude modulation on the carrier signal amplified in the step S204 and the error feedback control signal output in the step S203 to output an amplitude modulated wave signal.
In this embodiment, the error feedback control signal Er ═ Σ Er · cos Ω t and the amplified carrier signal v0′＝Kv0cosω0t is amplitude modulated for the second time to generate amplitude modulated wave signal B with high power KVcm(1+macosωΩt)cosω0t。
S206: and coupling the amplitude modulated wave signal, and outputting the coupled result as a feedback signal for error processing.
For example, the amplitude modulated wave signal B output in step S205 is KVcm(1+macosωΩt)cosω0t are coupled to obtain a feedback signal C which is B/K. Wherein K represents a magnification factor, VcmRepresenting the linear output carrier amplitude, maRepresenting the modulation index, ωΩRepresenting the modulation frequency, ω0Representing the carrier angular frequency.
The embodiment shows that the efficiency of the whole system is improved by adopting a high-efficiency power amplifier (such as an E-type power amplifier) circuit to amplify the input carrier signal, and meanwhile, the distortion in the modulation process is reduced by combining feedback control, so that the high-efficiency linear amplitude modulation is realized, and the power loss in a wireless communication system is reduced.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
It can be seen from the above embodiments that, in the process of linear modulation, a high-efficiency power amplifier (e.g., a class E power amplifier) is combined with an error feedback control circuit, and the high-efficiency power amplifier (e.g., a class E power amplifier) circuit is used to amplify the power of an input carrier signal, so as to improve the efficiency of the whole system; meanwhile, by combining a feedback control circuit, through coupling, demodulation and error processing, the distortion in the modulation process is reduced, high-efficiency linear amplitude modulation is realized, and the power loss in a wireless communication system is reduced; and because the high-efficiency power amplifier and the error feedback control circuit are adopted, the method is simple in structure and easy to realize.
While the method and transmitter for amplitude modulation provided by the present invention have been described in detail, those skilled in the art will appreciate that the various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (5)
1. A transmitter for receiving a carrier signal and a baseband signal, the transmitter comprising:
power amplifier unit, first amplitude modulation unit, coupling unit, error processing unit, second amplitude modulation unit, wherein:
the power amplification unit is used for amplifying the received carrier signal to obtain an amplified carrier signal;
the first amplitude modulation unit is used for carrying out amplitude modulation on the received baseband signals and carrier signals and outputting a first amplitude modulation result;
the coupling unit is used for coupling the amplitude modulated wave signal output by the second amplitude modulation unit and outputting a coupling result, wherein the coupling result is the attenuation K times of the amplitude modulated wave signal, and K is the amplification factor of the power amplification unit;
the error processing unit is configured to perform error processing on the first amplitude modulation result output by the first amplitude modulation unit and the coupling result output by the coupling unit to obtain an error feedback control signal;
the second amplitude modulation unit is used for carrying out amplitude modulation on the carrier signal amplified by the power amplification unit and the error feedback control signal and outputting an amplitude modulated wave signal;
the error processing unit includes:
the error extraction unit is used for comparing the coupling result output by the coupling unit with the first amplitude modulation result output by the first amplitude modulation unit to obtain an error signal;
a baseband signal demodulation unit, configured to demodulate the error signal according to the received carrier signal to obtain a baseband error signal;
and the amplitude error integrating unit is used for integrating and summing the fundamental frequency error signal to obtain an error feedback control signal.
2. The transmitter according to claim 1, wherein the baseband signal demodulation unit comprises:
a multiplication unit for multiplying the received carrier signal by the error signal and outputting a multiplication result;
and the filtering unit is used for filtering the multiplication result output by the multiplication unit to obtain the fundamental frequency error signal.
3. The transmitter of claim 1 or 2, wherein the power amplifier unit is a class E power amplifier.
4. A method of amplitude modulation, comprising:
receiving a baseband signal and a carrier signal;
carrying out first amplitude modulation on the received baseband signal and the carrier signal, and outputting a first amplitude modulation result;
performing error processing on the first amplitude modulation result and the feedback signal, and outputting an error feedback control signal, wherein the error processing includes comparing the feedback signal with the first amplitude modulation output result to obtain an error signal; demodulating the error signal according to the received carrier signal to obtain a fundamental frequency error signal; carrying out integral summation on the fundamental frequency error signal to obtain an error feedback control signal;
amplifying the received carrier signal and outputting the amplified carrier signal;
carrying out secondary amplitude modulation on the amplified carrier signal and the error feedback control signal, and outputting an amplitude modulated wave signal;
and coupling the amplitude modulated wave signal, outputting a coupling result as a feedback signal for error processing, wherein the coupling result is attenuation K times of the amplitude modulated wave signal, and K is the amplification multiple.
5. The method of claim 4, wherein demodulating the error signal from the received carrier signal to obtain a baseband error signal comprises:
multiplying the received carrier signal by the error signal and outputting a multiplication result;
and filtering the multiplication result to obtain the fundamental frequency error signal.
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