CN111669132A - Method for improving short wave digital predistortion processing index precision - Google Patents
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Abstract
The invention belongs to the technical field of self-adaptive digital predistortion, and discloses a method for improving the index precision of short wave digital predistortion processing, which comprises the following steps: step 1, amplifying an original input signal by a power amplifier to obtain an output signal after power amplification; step 2, processing the original input signal and the output signal after power amplification by adopting a predistortion algorithm module to obtain a lookup table parameter of the inverse characteristic of the power amplification distortion; wherein, an integer integration decimal table index structure is adopted in the predistortion algorithm module; step 3, correcting the input signal of the power amplifier by using the lookup table parameter of the inverse characteristic of the power amplifier distortion to obtain a signal after pre-distortion treatment; aiming at the short wave signal standard characteristic, the method designs an integer integration decimal table index structure, so that the table index precision can be improved, the performance of a digital predistortion system is improved, and compared with the integer table index structure, the third-order intermodulation index (2-30 MHz) of a transmitter can be improved by more than 5 dB.
Description
Technical Field
The invention relates to the technical field of self-adaptive digital predistortion, in particular to a method for improving the index precision of short-wave digital predistortion processing, which is suitable for improving the efficiency of a short-wave radio frequency power amplifier and the performance of a digital predistortion system.
Background
The radio electromagnetic wave frequency with the frequency range of 1.6 MHz-30 MHz is generally called as short wave frequency band, and the short wave frequency is utilized to carry out broadcasting transmission in the world to carry out one-way communication, which is generally called as short wave broadcasting; a radio capable of receiving a certain frequency is called a short wave radio station. Because the short-wave communication is mainly transmitted by back-and-forth reflection and refraction between the ionized layer and the ground, the short wave can be transmitted far no matter day or night. With the continuous development of computer, microelectronic and wireless communication technologies, the short wave communication technology has breakthrough development, and the short wave communication technology plays more important and wider roles in emergency communication, disaster-resistant communication, and particularly in military requirement unified communication command of land, sea and air.
At present, short-wave radio stations are increasingly digitalized, and the working frequency band of the short-wave radio stations is not limited to the original short-wave frequency band range, so that the short-wave radio stations have the characteristics of multiple bands and multiple channels. In the digitization process of the short-wave radio station, higher and higher requirements are provided for the performance of the short-wave power amplifier, namely, the power amplifier has higher efficiency on the premise of meeting higher linear requirements. In order to meet the requirement, the amplifier is linear and efficient, various means are adopted to realize the high efficiency and high linearity of the amplifier, and the predistortion technology can also utilize the self-adaptive principle to track and compensate the error of the power amplifier caused by the change of environmental factors such as temperature, humidity and the like. In a word, the predistortion technology not only can improve the efficiency of the transmitter, reduce the cost and reduce the volume, but also can effectively increase the linearity of the transmitter so as to improve the system efficiency and the communication quality, and has very important practical significance for the development and the realization of a future high-efficiency short-wave radio station.
For the convenience of implementation, the short-wave digital predistortion structure adopts a Lookup Table (LUT) method, and as shown in fig. 1, this form of predistortion works by means of the LUT. The LUT is retrieved as a function of the amplitude of the signal, or input amplitude, and then modifies the amplitude and phase of the signal applied to the input of the power amplifier. The predistortion system architecture contains two channels: a loop path for data training and a predistortion path. The data training channel is a loop structure, the core part of the data training channel is a predistortion algorithm module, and the module extracts the distortion characteristic of the power amplifier by processing a feedback (obtained by power amplifier output coupling) signal after power amplification and an original input signal, so as to obtain an LUT parameter of the inverse distortion characteristic of the power amplifier. When the power amplifier characteristic changes along with the change of time or external environment, the parameter of the predistortion inverse characteristic LUT can be updated through the adaptive predistortion algorithm.
FIG. 2 is a diagram illustrating a basic predistortion parameter extraction method; where X is the input signal and Y is the output (feedback) signal. Firstly, determining output power according to requirements, when the system runs for the first time, the system is in a straight-through state, LUT parameters are all '1', LUT (X) is equal to X, after signals pass through a power amplifier, a first group of output data is obtained, predistortion is carried out through feedback, LUT parameters are obtained through solving min | LUT (Y) -LUT (X) |, then the LUT parameters are continuously corrected in an iteration process until output signals Y obtain a satisfactory effect, and the LUT parameters at the moment are extracted to be used as a predistortion LUT under the output power for an open-loop system.
In the conventional table index of the predistortion model, an integer index structure is adopted, that is, an integer division with equal intervals is adopted for the amplitude of an input signal to obtain a table index address. Therefore, the index precision of the table is reduced, and under the condition that the length of the table is limited, the predistortion effect of the table generates 'burrs' in a time domain due to the problem of insufficient index precision, which further influences other short-wave system processing links such as capture and the like in the following.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for improving the index precision of short-wave digital predistortion processing, and the method designs a memory polynomial model of an integer integration decimal table index structure aiming at the standard characteristic of a short-wave signal, so that the table index precision can be improved, and the performance of a digital predistortion system is further improved; and compared with an integer table index structure, the third-order intermodulation index (2 MHz-30 MHz) of the transmitter can be improved by more than 5 dB.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A method for improving index precision of short wave digital predistortion processing comprises the following steps:
step 1, amplifying an original input signal X (n) by a power amplifier to obtain an output signal after power amplification; wherein the input signal of the power amplifier is equal to the original input signal x (n);
and 3, correcting the amplitude and the phase of the input signal X (n) of the power amplifier by using the parameters of the lookup table of the distortion inverse characteristic of the power amplifier to obtain a signal Z (n) after pre-distortion treatment.
Further, step 2 specifically includes the following substeps:
substep 2.1, carrying out power calculation on the original input signal X (n) to obtain the power of the input signal;
and substep 2.2, dividing the power of the input signal into an integer part and a decimal part, and determining corresponding lookup table parameters of the inverse distortion characteristic of the power amplifier according to the integer part and the decimal part.
Further, the substep 2.2 is specifically:
determining a corresponding table index address according to the integer part, and then finding a corresponding integer part lookup table and an adjacent lookup table which is 1 larger than the integer part according to the table index address, so that an integer part lookup table parameter corresponding to the integer part lookup table and an adjacent lookup table parameter corresponding to the adjacent lookup table can be obtained;
performing difference operation on the adjacent lookup table parameters and the integer lookup table parameters to obtain difference values; multiplying the difference value by the decimal part to obtain a product;
and performing summation operation on the product and the parameters of the lookup table of the integer part to obtain a summation value, wherein the summation value is the parameters of the lookup table of the distortion inverse characteristic of the power amplifier.
Further, in substep 2.2, the calculation formula of the look-up table parameters of the inverse distortion characteristic of the power amplifier is as follows:
LUT(A.B)＝LUT(A)+(A.B-A)*(LUT(A+1)-LUT(A))
wherein, a.b is the power of the input signal, a is the integer part of the power of the input signal, B is the decimal part of the power of the input signal, LUT (a) is the integer part lookup table parameter, (LUT (a +1) is the adjacent lookup table parameter, LUT (a.b) is the lookup table parameter of the inverse characteristic of the power amplifier distortion.
Further, step 3 specifically comprises:
and multiplying the summation value by an input signal X (n) of the power amplifier to obtain a signal Z (n) after predistortion treatment.
Compared with the prior art, the invention has the beneficial effects that:
because the characteristics of the power amplifier are different along with the different characteristics of input signals, a memory polynomial model of an integer integration decimal form index structure is designed aiming at the digital predistortion linearization of the short-wave power amplifier according to the comprehensive consideration of factors such as the actual predistortion linearization performance, the realization complexity and the like, so that the form index precision can be improved, and the performance of a digital predistortion system is further improved; compared with an integer table index structure, the integer integration decimal table index structure can eliminate 'burrs' generated by the integer index structure in the time domain, and meanwhile, the third-order intermodulation index (2 MHz-30 MHz) of the transmitter can be improved by more than 5 dB.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a diagram of the overall architecture of a basic predistortion architecture;
FIG. 2 is a diagram illustrating a conventional extraction of a pre-distortion table;
FIG. 3 is a diagram of a table index structure of a conventional predistortion model;
FIG. 4 is a diagram of a time domain simulation result indexed by an integer table of a conventional predistortion model; wherein, (a) is an integral simulation result diagram; (b) is a partial enlarged view at A in figure (a);
FIG. 5 is a diagram of an index structure of an integer integration decimal table of a predistortion model of the present application;
FIG. 6 is a graph of a predistortion model integer-integrated decimal table index time domain simulation result of the present application; (a) is an integral simulation result graph; (b) is a partial enlarged view at A in figure (a);
FIG. 7 is a graph of frequency domain simulation results for integer index and integer integral fractional index of a predistortion model; wherein; (a) a comparison graph of the overall simulation result is obtained; (b) is a partial enlarged view at a in fig. (a).
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
A method for improving index precision of short wave digital predistortion processing comprises the following steps:
step 1, amplifying an original input signal X (n) by a power amplifier to obtain an output signal after power amplification; wherein the input signal of the power amplifier is equal to the original input signal x (n).
Specifically, step 2 comprises the following substeps:
substep 2.1, carrying out power calculation on the original input signal X (n) to obtain the power of the input signal;
substep 2.2, dividing the power of the input signal into an integer part and a fractional part; determining corresponding lookup table parameters of the inverse characteristics of the power amplifier distortion according to the integer part and the decimal part, which is as follows:
determining a corresponding table index address according to the integer part, and then finding a corresponding integer part lookup table and an adjacent lookup table which is 1 larger than the integer part according to the table index address, so that an integer part lookup table parameter corresponding to the integer part lookup table and an adjacent lookup table parameter corresponding to the adjacent lookup table can be obtained;
performing difference operation on the adjacent lookup table parameters and the integer lookup table parameters to obtain difference values; multiplying the difference value by the decimal part to obtain a product;
and performing summation operation on the product and the lookup table parameters of the integer part to obtain a summation value, wherein the summation value is the lookup table parameters of the distortion inverse characteristic of the power amplifier, and the specific calculation formula is as follows:
LUT(A.B)＝LUT(A)+(A.B-A)*(LUT(A+1)-LUT(A))
wherein, a.b is the power of the input signal, a is the integer part of the power of the input signal, B is the decimal part of the power of the input signal, LUT (a) is the integer part lookup table parameter, (LUT (a +1) is the adjacent lookup table parameter, LUT (a.b) is the lookup table parameter of the inverse characteristic of the power amplifier distortion.
And 3, correcting the amplitude and the phase of the input signal X (n) of the power amplifier by using the parameters of the lookup table of the distortion inverse characteristic of the power amplifier to obtain a signal Z (n) after pre-distortion treatment.
The method specifically comprises the following steps: and multiplying the summation value by an input signal X (n) of the power amplifier to obtain a signal Z (n) after predistortion treatment.
As shown in fig. 5, in the structure diagram of the integer-integrated fractional table index of the predistortion model of the present application, when the calculated power of the input signal is 36.6, the integer-integrated fractional table index structure is adopted, and the look-up table parameter LUT (36.6) of the inverse characteristic of the power amplifier distortion is obtained by the following formula:
LUT(36.6)＝LUT(36)+(36.6-36)*(LUT(37)-LUT(36))
and then multiplying the obtained look-up table parameter LUT (36.6) of the distortion inverse characteristic of the power amplifier with an input signal X (n) of the power amplifier to obtain a signal Z (n) after pre-distortion treatment.
FIG. 6 is a diagram of a time domain simulation result of integer integration decimal table indexing of a predistortion model; as shown in fig. 6, the predistortion effect of the integer-integrated decimal table index is improved by the precision of the index, and the "glitch" generated by the integer index structure is eliminated in the time domain.
Comparative example 1
Fig. 3 is a diagram of an index structure of a conventional predistortion model table. The power calculation is carried out by an input signal X (n) to obtain a corresponding table index address P (X (n)), then a corresponding LUT parameter, namely LUT (P (X (n)) is obtained according to the table index address P (X (n)), and then the LUT (P (X (n)) is adopted to correct the amplitude and the phase of the signal X (n) applied to the power amplifier input end to obtain Z (n) after the predistortion treatment.
In the table index, an integer index structure is adopted, that is, an equally spaced integer division is adopted for the amplitude of the input signal, so as to obtain a table index address. As shown in fig. 4, when the calculated power is 36.6, a rounding method is generally adopted to directly round 36.6 to 37, and then the table index lookup table parameters corresponding to 37 are adopted to correct the amplitude and phase of the signal x (n) applied to the input end of the power amplifier. As can be seen from fig. 4, the index precision of the table is reduced by using the integer table index, and in the case of limited table length, the predistortion effect of the table generates a "glitch" phenomenon in the time domain due to the problem of insufficient index precision, which further affects other short-wave system processing links such as capture and the like in the following.
The integer-integrated decimal index structure of the predistortion model of example 1 and the integer index structure of comparative example 1 were simulated in the frequency domain, and the results are shown in fig. 7. As can be seen from fig. 7, after the integer-integrated decimal index structure is adopted, the third-order intermodulation index (2 MHz-30 MHz) of the transmitter can be improved by more than 5dB, and the frequency spectrum quality of the transmitter is also greatly improved.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. A method for improving index precision of short wave digital predistortion processing is characterized by comprising the following steps:
step 1, amplifying an original input signal X (n) by a power amplifier to obtain an output signal after power amplification; wherein the input signal of the power amplifier is equal to the original input signal x (n);
step 2, processing the original input signal X (n) and the output signal after power amplification by adopting a predistortion algorithm module, and extracting the distortion characteristic of the power amplification so as to obtain a lookup table parameter of the distortion inverse characteristic of the power amplification; wherein, an integer integration decimal table index structure is adopted in the predistortion algorithm module;
and 3, correcting the amplitude and the phase of the input signal X (n) of the power amplifier by using the parameters of the lookup table of the distortion inverse characteristic of the power amplifier to obtain a signal Z (n) after pre-distortion treatment.
2. The method for improving the index accuracy of short wave digital predistortion processing according to claim 1, wherein step 2 specifically comprises the following substeps:
substep 2.1, carrying out power calculation on the original input signal X (n) to obtain the power of the input signal;
and substep 2.2, dividing the power of the input signal into an integer part and a decimal part, and determining corresponding lookup table parameters of the inverse distortion characteristic of the power amplifier according to the integer part and the decimal part.
3. The method for improving the index accuracy of short wave digital predistortion processing according to claim 2, wherein substep 2.2 is specifically:
determining a corresponding table index address according to the integer part, and then finding a corresponding integer part lookup table and an adjacent lookup table which is 1 larger than the integer part according to the table index address, so that an integer part lookup table parameter corresponding to the integer part lookup table and an adjacent lookup table parameter corresponding to the adjacent lookup table can be obtained;
performing difference operation on the adjacent lookup table parameters and the integer lookup table parameters to obtain difference values; multiplying the difference value by the decimal part to obtain a product;
and performing summation operation on the product and the parameters of the lookup table of the integer part to obtain a summation value, wherein the summation value is the parameters of the lookup table of the distortion inverse characteristic of the power amplifier.
4. The method for improving the index accuracy of short wave digital predistortion processing according to claim 3, wherein in substep 2.2, the calculation formula of the look-up table parameters of the inverse characteristics of power amplifier distortion is:
LUT(A.B)＝LUT(A)+(A.B-A)*(LUT(A+1)-LUT(A))
wherein, a.b is the power of the input signal, a is the integer part of the power of the input signal, B is the decimal part of the power of the input signal, LUT (a) is the integer part lookup table parameter, (LUT (a +1) is the adjacent lookup table parameter, LUT (a.b) is the lookup table parameter of the inverse characteristic of the power amplifier distortion.
5. The method for improving the index accuracy of short wave digital predistortion processing according to claim 3, wherein step 3 is specifically:
and multiplying the summation value by an input signal X (n) of the power amplifier to obtain a signal Z (n) after predistortion treatment.
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