Method and device for suppressing bandwidth of phase modulation signal for polar coordinate transmitter

Abstract

The invention relates to a phase modulation signal bandwidth suppression method and device for a polar coordinate transmitter, and relates to the technical field of signal processing, and the method comprises the steps: obtaining the amplitude of an amplitude modulation signal; determining whether the amplitude of the amplitude modulation signal is smaller than a preset threshold value or not; in response to the fact that the amplitude of the amplitude modulation signal is smaller than the threshold value, determining a compression coefficient based on the amplitude modulation signal and a preset threshold value; compressing a phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a phase modulation signal subjected to bandwidth suppression; wherein the amplitude modulation signal and the phase modulation signal are separated by a polar coordinate transmitter. According to the invention, the distortion of the amplitude modulation signal can be avoided, the original point detection is simplified, and the calculation amount is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of signal processing, and more specifically, to a method and device for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter. Background Art

[0002] The polar coordinate transmitter separates the amplitude and phase information of the IQ signal at the baseband, transmits them in the form of amplitude modulated signal and phase modulated signal respectively, and finally synthesizes them into the transmission signal through the digital power amplifier. However, the separated phase modulated signal faces the problem of bandwidth broadening. This is because the signal phase will suddenly change in the area near the origin. When the baseband signal is converted to polar coordinates, the phase modulated signal will have bandwidth broadening due to the phase mutation.

[0003] The prior art generally suppresses the bandwidth broadening phenomenon by forcibly distorting the high-frequency signal area near the origin to an area far away from the origin to slow down the phase mutation.

[0004] However, this method needs to detect whether the signal is close to the origin and compare whether the phase of adjacent signal points changes suddenly. The detection complexity is high and the amount of calculation is large. In addition, this method needs to distort the signal interval of a certain length near the high-frequency signal point. Both the amplitude modulated signal and the phase modulated signal will be distorted, and excessive distortion will cause the error vector amplitude of the final transmitted signal to decrease. Summary of the invention

[0005] The present application is provided to solve the above problems existing in the prior art. According to a method and device for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter according to an embodiment of the present application, the distortion of the amplitude modulation signal can be avoided, the origin detection can be simplified, and the amount of calculation can be reduced.

[0006] In a first aspect, an embodiment of the present application provides a method for suppressing a phase modulation signal bandwidth for a polar coordinate transmitter, comprising:

[0007] Obtaining the amplitude of an amplitude modulated signal;

[0008] Determining whether the amplitude of the amplitude modulation signal is less than a preset threshold value;

[0009] In response to the amplitude of the amplitude modulated signal being less than the threshold value, determining a compression factor based on the amplitude modulated signal and a preset threshold value;

[0010] Compressing the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal;

[0011] The amplitude modulation signal and the phase modulation signal are separated and obtained by a polar coordinate transmitter.

[0012] In a second aspect, an embodiment of the present application provides a device for suppressing a phase modulation signal bandwidth of a polar coordinate transmitter, comprising:

[0013] An acquisition module configured to acquire the amplitude of the amplitude modulated signal;

[0014] A determination module configured to determine whether the amplitude of the amplitude modulation signal is less than a preset threshold value; in response to the amplitude of the amplitude modulation signal being less than the threshold value, determine a compression factor based on the amplitude modulation signal and the preset threshold value;

[0015] A compression module, configured to compress the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal;

[0016] The amplitude modulation signal and the phase modulation signal are separated and obtained by a polar coordinate transmitter.

[0017] In a third aspect, an embodiment of the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a method as described in any of the above embodiments.

[0018] The beneficial effect of the embodiment of the present application is that simplified origin detection is achieved through a preset threshold value, and only the phase modulation signal corresponding to the amplitude modulation signal less than the threshold value is compressed. The embodiment of the present application can avoid distortion of the amplitude modulation signal, simplify origin detection, and reduce the amount of calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0020] Figure 1 It is a schematic diagram of the bandwidth broadening of an amplitude modulation signal and a phase modulation signal;

[0021] Figure 2 It is a flow chart of a method for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter provided by an embodiment of the present application;

[0022] Figure 3is a schematic structural diagram of a polar coordinate transmitter system provided by an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of comparing the power spectrum density of a phase modulated signal before and after bandwidth broadening suppression provided by an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of time domain waveforms of an in-phase component and an orthogonal component of an amplitude modulation signal and a phase modulation signal after 2-fold upsampling and interpolation, provided by an embodiment of the present application;

[0025] Figure 6 A power spectrum density of a digital power amplifier synthesized IQ signal provided by an embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of a device for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter provided by an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific embodiments, but are not intended to limit the present application. The terms "first", "second" and "third" used in the present application are only intended to distinguish the corresponding features, do not represent the need for such an order, and do not necessarily represent only the singular form.

[0028] The polar coordinate transmitter separates the amplitude information and phase information of the IQ signal at the baseband, transmits them in the form of amplitude modulated signal and phase modulated signal respectively, and finally synthesizes the transmission signal through a digital power amplifier. The biggest advantage of the polar coordinate transmitter is the high working efficiency of the power amplifier, especially for broadband signals with a high peak-to-average power ratio. This is because the phase modulated signal has a constant envelope, and the power amplifier can ensure linear output without power backoff when working. However, the separated amplitude modulated signal and phase modulated signal face serious bandwidth broadening problems, especially the phase modulated signal, which puts higher requirements on the clock frequency of the digital processing module. Therefore, suppressing the bandwidth of the phase modulated signal and making the digital module work at a lower operating frequency is crucial to realizing a low-power and high-efficiency polar coordinate transmitter system.

[0029] like Figure 1 As shown, the horizontal axis is frequency, the vertical axis is relative power spectrum density, IQ Signal is the original baseband IQ signal, AM Signal is the amplitude modulated signal after polar coordinate conversion, and PM Signal is the phase modulated signal after polar coordinate conversion. Figure 1It can be seen that the phase modulated signal has a more serious bandwidth broadening problem than the amplitude modulated signal.

[0030] The reason why phase modulated signals have bandwidth broadening problems is that when the signal trajectory passes through the area near the coordinate origin, the signal phase will change suddenly. When the baseband signal is converted to polar coordinates, the phase modulated signal will have serious bandwidth broadening due to the phase mutation. The phase mutation generally occurs in the area where the signal envelope is close to the origin.

[0031] The existing technology generally solves this problem through origin signal distortion. This solution forcibly distorts the high-frequency signal area near the origin to an area far away from the origin to slow down the phase mutation and thus suppress the bandwidth broadening phenomenon. It mainly includes two steps: origin detection and signal distortion.

[0032] Among them, the origin detection includes: detecting the high-frequency signal interval whose envelope is close to the origin and whose phase changes suddenly; the signal distortion includes: calculating a distortion vector according to the signal value of the high-frequency interval and adding it to the original signal, forcing the high-frequency interval signal to move away from the origin to suppress the high-frequency component.

[0033] However, this method needs to detect whether the signal is close to the origin and compare whether the phase of adjacent signal points has changed suddenly, which makes the detection more complicated. In addition, this method needs to distort the signal interval of a certain length near the high-frequency signal point, and will distort both the amplitude modulated signal and the phase modulated signal. Excessive distortion will lead to poor quality of the error vector amplitude of the final transmitted signal, especially when phase mutations occur frequently. In addition, this method needs to calculate a distortion vector based on the signal near the high-frequency signal point. The calculation process is complicated, but the bandwidth suppression effect is limited.

[0034] In view of this, if Figure 2 As shown, an embodiment of the present application provides a method for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter, comprising:

[0035] Step 201: Obtain the amplitude of the amplitude modulation signal.

[0036] like Figure 3 As shown, after the method is applied to polar coordinate conversion, the input signal is the amplitude modulation signal AM and the phase modulation signal PM after the baseband IQ signal is mapped to the polar coordinates. Figure 7 The device shown can be operated in Figure 3 In the bandwidth suppression module shown, DAC is a digital-to-analog converter, DPA is a digital power amplifier, and CORDIC is a coordinate rotation digital calculation.

[0037] Step 202: Determine whether the amplitude of the amplitude modulated signal is less than a preset threshold value. In response to the amplitude of the amplitude modulated signal being less than the threshold value, execute step 203; otherwise, terminate the current process.

[0038] When the amplitude modulation signal is detected to be lower than the threshold value, it is considered to be close to the coordinate origin, and the point is determined to be a high-frequency signal point that causes bandwidth widening, and then the phase modulation signal corresponding to the point is compressed at a single point to suppress bandwidth widening.

[0039] The threshold value may be determined only by the root mean square of the amplitude modulation signal, may be determined only by the maximum signal amplitude of the polar coordinate emitter, or may be determined jointly by the root mean square of the amplitude modulation signal and the maximum signal amplitude of the polar coordinate emitter.

[0040] Step 203: Determine a compression factor based on the amplitude modulation signal and a preset threshold value.

[0041] Step 204: compressing the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal.

[0042] The amplitude modulation signal and the phase modulation signal are separated by a polar coordinate transmitter.

[0043] The embodiment of the present application realizes simplified origin detection through a preset threshold value, and only compresses the phase modulation signal corresponding to the amplitude modulation signal less than the threshold value. The embodiment of the present application can avoid distortion of the amplitude modulation signal, simplify origin detection, and reduce the amount of calculation.

[0044] In one embodiment of the present application, the threshold value is a smaller value between one quarter of the root mean square of the amplitude modulation signal and one sixteenth of the maximum signal amplitude of the polar coordinate transmitter.

[0045] The RMS value of the amplitude modulated signal can be calculated by equation (1).

[0046]

[0047] Among them, A(n) is used to represent the amplitude of the amplitude modulated signal, T RMS It is used to represent the root mean square of the amplitude modulated signal, and N is used to represent the number of signal sampling points.

[0048] The larger the threshold value, the better the bandwidth suppression effect, but the more compressed phase modulation signal points are, the greater the signal distortion is. The local non-constant envelope points of the phase modulation signal after bandwidth suppression will bring about a loss of work efficiency. In view of this, the embodiment of the present application sets the threshold value based on the root mean square of the amplitude modulation signal and the maximum signal amplitude of the polar coordinate emitter, thereby reducing signal distortion and reducing the loss of work efficiency while ensuring the bandwidth suppression effect.

[0049] In one embodiment of the present application, determining a compression factor based on an amplitude modulation signal and a preset threshold value includes:

[0050] A compression factor is determined based on the amplitude modulation signal, the threshold value, and a compression factor function that is determined in advance based on the degree of compression.

[0051] The range of compression degree ∈ is 0≤∈≤1. The greater the compression degree, the greater the degree of bandwidth broadening suppression, but the greater the signal distortion. According to the compression degree, the compression coefficient function can be roughly divided into three types, as shown in Table 1.

[0052] Table 1

[0053] Compression 0≤∈<0.5 ∈＝0.5 0.5<∈≤1 Compression factor function classification Undercompression Semi-compressed Overcompression

[0054] When the signal distortion is required to be as small as possible, under-compression can be used; when the bandwidth suppression effect is required to be as good as possible, over-compression can be used; in other cases, half-compression can be used.

[0055] The present application may select a corresponding compression coefficient function based on the requirements of the actual business scenario for the degree of signal distortion and the bandwidth suppression effect.

[0056] The three compression coefficient functions in Table 1 will be described below through different embodiments.

[0057] In one embodiment of the present application, the compression coefficient is determined based on the amplitude modulation signal, the threshold value and the compression coefficient function determined in advance based on the compression degree, including:

[0058] Based on the compression coefficient function, a ratio of the amplitude of the amplitude modulation signal to the threshold value is determined as the compression coefficient.

[0059] For half compression, the compression coefficient function is shown in formula (2).

[0060]

[0061] Where f(x) is the compression factor, x is used to represent the amplitude of the amplitude modulated signal, T is used to represent the threshold value, 0≤x <T。

[0062] In one embodiment of the present application, the compression coefficient is determined based on the amplitude modulation signal, the threshold value and the compression coefficient function determined in advance based on the compression degree, including:

[0063] Based on the compression coefficient function, the square of the ratio of the amplitude of the amplitude modulation signal to the threshold value is determined as the compression coefficient.

[0064] For over-compression, the compression coefficient function is shown in formula (3).

[0065]

[0066] Where f(x) is the compression factor, x is used to represent the amplitude of the amplitude modulated signal, T is used to represent the threshold value, 0≤x <T。

[0067] In one embodiment of the present application, the compression coefficient is determined based on the amplitude modulation signal, the threshold value and the compression coefficient function determined in advance based on the compression degree, including:

[0068] For under-compression, the compression coefficient function is shown in formula (4).

[0069]

[0070] Wherein, T is used to represent the threshold value, x is used to represent the amplitude of the amplitude modulation signal, and f(x) is used to represent the compression factor.

[0071] In one embodiment of the present application, compressing a phase modulation signal corresponding to an amplitude modulation signal based on a compression coefficient to obtain a bandwidth-suppressed phase modulation signal includes:

[0072] The amplitude of the phase modulated signal after bandwidth suppression is determined as the product of the compression factor and the amplitude of the phase modulated signal before suppression.

[0073] For high-frequency signal points, the amplitude modulation signal is kept unchanged, and the phase modulation signal is proportionally compressed according to the amplitude signal value. The phase modulation signal after bandwidth suppression locally presents a non-constant inclusion characteristic.

[0074] It should be noted that the compression coefficient function provided in the above embodiment is only an example. In actual application scenarios, the compression coefficient function can be selected based on formula (5).

[0075]

[0076] It can be seen from formula (5) that the compression degree ∈ is determined by the integral of the compression coefficient function. In actual application scenarios, the compression coefficient function can be selected based on the compression degree.

[0077] By using the method provided in any of the above embodiments, the following technical effects can be achieved:

[0078] (1) Suppress the bandwidth of the phase modulated signal. Figure 4 As shown in the figure, the far-end high-frequency component is suppressed by about 12dB. This is because the local phase mutation signal strength is suppressed by a simple scaling operation, thereby effectively suppressing the high-frequency component of the phase signal and alleviating the bandwidth broadening problem of the phase modulation signal. Among them, PM Signal is the original phase modulation signal obtained after polar coordinate conversion, and Bandwidth-reduced PM is the phase modulation signal after bandwidth suppression.

[0079] (2) Improve the signal accuracy of subsequent digital modules, especially for subsequent upsampling interpolation operations. This is because the bandwidth of the phase modulated signal is suppressed, which greatly improves the aliasing phenomenon during subsequent upsampling interpolation operations. The local high-frequency components of the phase modulated signal are compressed proportionally according to the amplitude, so that the phase modulated signal is locally compressed while also carrying amplitude information, thereby ensuring the interpolation accuracy of the high-frequency components.

[0080] like Figure 5 The figure shows the time domain waveform of the in-phase component and quadrature component of the amplitude modulated signal and phase modulated signal after 2-fold upsampling and interpolation, where the horizontal axis is the time sample point and the vertical axis is the signal strength. From top to bottom, they are the in-phase component of the amplitude modulated signal, the phase modulated signal, and the quadrature component of the phase modulated signal. Ideal is the ideal signal value corresponding to the 2-fold upsampling of the IQ signal, Interpolated AM is the signal value obtained after the amplitude modulated signal of the polar coordinate transmitter is 2-fold upsampled (that is, no bandwidth suppression is performed), Interpolated PM is the signal value obtained after the phase modulated signal of the polar coordinate transmitter is 2-fold upsampled (that is, no bandwidth suppression is performed), and Bandwidth-reduced is the signal value obtained after the phase modulated signal of the polar coordinate transmitter is bandwidth suppressed and then 2-fold upsampled.

[0081] Depend on Figure 5 It can be seen that a phase mutation occurs between the sampling points n=9 and n=11. When the original phase modulated signal is interpolated, a large phase error will be generated at the n=10 signal point in the phase mutation area. The interpolated time domain waveform of the phase modulated signal after bandwidth suppression can be almost consistent with the ideal waveform, and the interpolation error is small.

[0082] Table 2

[0083]

[0084]

[0085] As shown in Table 2, the method provided by any of the above embodiments affects the error vector magnitude of a typical WLAN broadband signal. It can be seen from Table 2 that the method provided by any of the embodiments does not deteriorate the error vector magnitude of the final transmitted signal, but slightly improves the signal quality due to the improved interpolation accuracy.

[0086] (3) Improve the spectrum performance of the synthetic signal. Figure 6As shown, the out-of-band component is reduced by about 5dB. From the perspective of frequency domain, the bandwidth suppression of the amplitude modulated signal reduces the high-frequency out-of-band component of the final digital power amplifier synthesized signal. Taking the time domain waveform as an example, the error introduced by the subsequent operation of the phase modulated signal after bandwidth suppression is smaller, avoiding the breeding of out-of-band components. Among them, Without bandwidth reduction is the baseband synthesized signal obtained without bandwidth suppression, Bandwidth-reduced is the baseband synthesized signal obtained after the bandwidth suppression operation, and 3GPP spectrum mask is the spectrum emission mask specified by the Third Generation Partnership Project.

[0087] (4) Reduce system power consumption. The method proposed in this application can effectively suppress the bandwidth of the phase modulated signal. Under the premise of ensuring the error vector amplitude of the transmitted signal and the spectrum transmission template performance, it can allow the digital module to operate at a lower clock frequency, thereby significantly reducing the power consumption of the polar coordinate transmission system.

[0088] like Figure 7 As shown, an embodiment of the present application provides a device for suppressing the bandwidth of a phase modulation signal for a polar coordinate transmitter, comprising:

[0089] An acquisition module 701 is configured to acquire the amplitude of the amplitude modulated signal;

[0090] The determination module 702 is configured to determine whether the amplitude of the amplitude modulated signal is less than a preset threshold value; in response to the amplitude of the amplitude modulated signal being less than the threshold value, determine a compression factor based on the amplitude modulated signal and the preset threshold value;

[0091] A compression module 703 is configured to compress a phase modulation signal corresponding to the amplitude modulation signal based on a compression coefficient to obtain a bandwidth-suppressed phase modulation signal;

[0092] The amplitude modulation signal and the phase modulation signal are separated by a polar coordinate transmitter.

[0093] In one embodiment of the present application, the determination module 702 is configured to determine the compression coefficient based on the amplitude modulation signal, the threshold value and a compression coefficient function determined in advance based on the compression degree.

[0094] In one embodiment of the present application, the determination module 702 is configured to determine, based on a compression coefficient function, a ratio of the amplitude of the amplitude modulated signal to a threshold value as a compression coefficient.

[0095] In one embodiment of the present application, the determination module 702 is configured to determine, based on a compression coefficient function, the square of the ratio of the amplitude of the amplitude modulated signal to the threshold value as the compression coefficient.

[0096] In one embodiment of the present application, the determination module 702 is configured as a compression coefficient function as shown in formula (4).

[0097] In one embodiment of the present application, the compression module 703 is configured to determine the amplitude of the phase modulated signal after bandwidth suppression as the product of the compression coefficient and the amplitude of the phase modulated signal before suppression.

[0098] An embodiment of the present application provides a computer program product, including a computer program / instruction, which implements the method described in any of the above embodiments when executed by a processor.

[0099] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. Although several embodiments are listed and described for the wireless communication method and the wireless communication component, it should be noted that the method details involved in the description of the wireless communication component can also be incorporated into the various embodiments of the wireless communication method, and vice versa.

[0100] The elements in the claims are to be interpreted broadly based on the language employed in the claims and are not limited to the examples described in this specification or during the prosecution of the application, which examples are to be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, with the true scope and spirit being indicated by the claims and the full scope of their equivalents.

[0101] The order of each step in the present application is merely exemplary and not restrictive. Without affecting the implementation of the present application (without destroying the required logical relationship between the steps), the execution order of the steps can be adjusted, and the various embodiments obtained after the adjustment still fall within the scope of the present application.

[0102] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the application. This should not be interpreted as an intention that a disclosed feature that does not require protection is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a specific disclosed embodiment. Thus, the claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.

Claims

1. A method for suppressing the bandwidth of a phase modulated signal for a polar coordinate transmitter, characterized in that: include: Obtaining the amplitude of an amplitude modulated signal; Determining whether the amplitude of the amplitude modulation signal is less than a preset threshold value; In response to the amplitude of the amplitude modulated signal being less than the threshold value, determining a compression factor based on the amplitude modulated signal and a preset threshold value; Compressing the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal; The amplitude modulation signal and the phase modulation signal are separated and obtained by a polar coordinate transmitter.

2. The method according to claim 1, characterized in that The threshold value is determined by the root mean square of the amplitude modulated signal and the maximum signal amplitude of the polar coordinate emitter.

3. The method according to claim 2, characterized in that The threshold value is a smaller value between one quarter of the root mean square of the amplitude modulation signal and one sixteenth of the maximum signal amplitude of the polar coordinate transmitter.

4. The method according to claim 1, characterized in that Based on the amplitude modulation signal and the preset threshold value, the compression factor is determined, including: The compression coefficient is determined based on the amplitude modulation signal, the threshold value and a compression coefficient function determined in advance based on the compression degree.

5. The method according to claim 4, characterized in that Determining the compression coefficient based on the amplitude modulation signal, the threshold value, and a compression coefficient function determined in advance based on the degree of compression includes: Based on the compression coefficient function, a ratio of the amplitude of the amplitude modulation signal to the threshold value is determined as the compression coefficient.

6. The method according to claim 4, characterized in that Determining the compression coefficient based on the amplitude modulation signal, the threshold value, and a compression coefficient function determined in advance based on the degree of compression includes: Based on the compression coefficient function, the square of the ratio of the amplitude of the amplitude modulated signal to the threshold value is determined as the compression coefficient.

7. The method according to claim 4, characterized in that Determining the compression coefficient based on the amplitude modulation signal, the threshold value, and a compression coefficient function determined in advance based on the degree of compression includes: The compression factor function includes: Wherein, T is used to characterize the threshold value, x is used to characterize the amplitude of the amplitude modulation signal, and f(x) is used to characterize the compression coefficient.

8. The method according to claim 1, characterized in that Compressing the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal includes: The amplitude of the phase modulated signal after bandwidth suppression is determined as the product of the compression factor and the amplitude of the phase modulated signal before suppression.

9. A device for suppressing the bandwidth of a phase modulated signal for a polar coordinate transmitter, characterized in that: include: An acquisition module configured to acquire the amplitude of the amplitude modulated signal; A determination module, configured to determine whether the amplitude of the amplitude modulation signal is less than a preset threshold value; In response to the amplitude of the amplitude modulated signal being less than the threshold value, determining a compression factor based on the amplitude modulated signal and a preset threshold value; A compression module, configured to compress the phase modulation signal corresponding to the amplitude modulation signal based on the compression coefficient to obtain a bandwidth-suppressed phase modulation signal; The amplitude modulation signal and the phase modulation signal are separated and obtained by a polar coordinate transmitter.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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