Baseband chip, transmitter, and terminal device

Abstract

The embodiments of the present invention relate to the field of communications. Provided are a baseband chip, a transmitter, and a terminal device. The baseband chip comprises: a low-order filter, which is used for performing filtering processing on a target signal, so as to obtain a transmission signal, and sending the transmission signal to a radio-frequency unit, wherein the low-order filter is determined on the basis of suppression level requirements for out-of-band spurs of a target channel, and the target channel is a communication channel used for transmitting the transmission signal; and a pre-compensator, which is used for performing, on the basis of a pre-compensation parameter, pre-compensation processing on a baseband signal to obtain the target signal, so as to compensate for in-band distortion caused by the low-order filter performing filtering processing on the target signal, wherein the pre-compensation parameter is determined on the basis of parameters of the low-order filter.

Description

Baseband chip, transmitter, terminal equipment

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202411954661.8, filed on December 27, 2024, entitled "Baseband Chip, Transmitter, Terminal Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present invention relate to the field of communications, and more specifically, to a baseband chip, a transmitter, and a terminal device. Background Technology

[0004] Out-of-band spurs refer to stray signals that appear outside the signal band in wireless communication systems due to non-ideal hardware characteristics (such as nonlinear effects, clock imperfections, etc.). These spurious signals may interfere with the normal operation of other communication systems, leading to a degraded communication quality. Therefore, suppressing out-of-band spurs is an important aspect of wireless communication system design.

[0005] In wireless communication systems, suppressing out-of-band spurious signals is crucial for ensuring communication quality and avoiding interference. If out-of-band spurious signals are not effectively suppressed, these signals can interfere with adjacent or distant channels, affecting the communication experience of other users and potentially causing system failure. Therefore, designing effective out-of-band spurious signal suppression techniques is a key challenge in wireless communication system design.

[0006] Currently, the suppression of out-of-band spurious signals in baseband chips mainly employs filtering-based methods. For example, adding a low-pass filter (LPF) to the signal link can effectively suppress out-of-band spurious signals. However, to achieve the desired suppression effect, higher-order filters are usually required. Higher-order filters occupy more baseband chip area, sometimes even requiring a larger baseband chip. Therefore, it is difficult to meet the requirements for miniaturization of baseband chips. Summary of the Invention

[0007] This invention provides a baseband chip, a transmitter, and a terminal device.

[0008] According to an embodiment of the present invention, a baseband chip is provided, comprising: a low-order filter for filtering a target signal to obtain a transmit signal and transmitting the transmit signal to a radio frequency unit, wherein the low-order filter is determined based on the out-of-band spurious suppression level requirement of a target channel, the target channel being a communication channel for transmitting the transmit signal; and a pre-compensator for pre-compensating the baseband signal based on pre-compensation parameters to obtain the target signal, thereby compensating for in-band distortion caused by the low-order filter filtering the target signal, wherein the pre-compensation parameters are determined based on the parameters of the low-order filter.

[0009] According to another embodiment of the present invention, a transmitter is provided, comprising: a baseband chip as described in any of the preceding claims; and a radio frequency unit for transmitting the transmitted signal.

[0010] According to yet another embodiment of the present invention, a terminal device is also provided, including the transmitter as described above. Attached Figure Description

[0011] Figure 1 is a schematic diagram of the frequency band division covering the 2380-2500MHz spectrum range;

[0012] Figure 2 is a schematic diagram of the spectrum template required by SRRC and the spectrum template required by IEEE when a communication system or device is operating in channel 13 of the WIFI band.

[0013] Figure 3 is a schematic diagram of the frequency-amplitude response of a certain channel X under different out-of-band spurious suppression methods;

[0014] Figure 4 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention;

[0015] Figure 5 is a schematic diagram of the out-of-band spurious suppression effect achieved by combining a pre-compensator and a low-order filter according to an embodiment of the present invention;

[0016] Figure 6 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention;

[0017] Figure 7 is a schematic diagram of the structure of the baseband chip according to an embodiment of the present invention;

[0018] Figure 8 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention;

[0019] Figure 9 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention. Detailed Implementation

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] In related technologies, the specific definition or characteristics of a transmit spectrum template (SEM) are constrained by spectrum behavior due to various regulatory requirements affecting adjacent radio frequency (RF) ranges. For example, in China (where the State Radio Regulatory Commission of the People's Republic of China (SRRC) is responsible for regulating services), certain RF bands may be reserved or allocated for specific purposes (e.g., LTE bands operated by specific operators), while other bands may be allocated to wireless LAN services (such as Wi-Fi-based communication technologies).

[0023] Figure 1 is a schematic diagram of the frequency band division within the 2380-2500MHz spectrum range. As shown in Figure 1, this RF range includes the first SRRC band edge 101, with a frequency range of 2380-2400MHz. Adjacent to this is the WIFI band 102, which corresponds to the 2.4GHz frequency point and is divided into channels 1 to 13, with a corresponding frequency range of 2400-2483MHz. Adjacent to this is the second SRRC band edge 103, with a frequency range of 2483.5-2500MHz.

[0024] For example, in certain situations, communication systems and devices operating in channels (e.g., channel 1, channel 13) near the edge of the first SRRC band 101 or the edge of the second SRRC band 103 may be subject to different spectral behavior constraints. For instance, when a communication system or device operates in channel 13 of the WIFI band 102 (i.e., near the edge of the second SRRC band 103 in Figure 1), the communication system or device needs to comply with SRRC regulatory requirements (i.e., the requirements regarding how much power leakage to the edge of the second SRRC band 103 is allowed) and must also comply with the IEEE spectrum requirements corresponding to channel 13.

[0025] Figure 2 is a schematic diagram of the spectrum templates required by the SRRC and the IEEE when a communication system or device operates in channel 13 of the WIFI band. As shown in Figure 2, the divided channel is affected by both the IEEE and SRRC regulatory requirements. For example, channel 13 is primarily constrained by the IEEE regulatory spectrum template 202. To the left of channel 13 is channel 12. Since channel 12 is an in-band channel of WIFI band 102, the left side of channel 13 can be primarily constrained by the IEEE regulatory spectrum template 200. Spectrum template 200 allows for a relaxed spectrum fading in the left region of channel 13 (i.e., the left region of channel 13 can gradually decrease to a specified amplitude level). To the right of channel 13 is the second SRRC band edge 103. Since the second SRRC band edge 103 is an out-of-band channel of WIFI band 102, the right side of channel 13 is primarily constrained by the SRRC regulatory spectrum template 204. Specifically, spectrum template 204 requires a strict spectral drop in the right-hand region of channel 13 (i.e., the right-hand region of channel 13 needs to be rapidly reduced to a low amplitude level). Therefore, under the combined effect of IEEE regulatory requirements and SRRC regulatory requirements, a spectrum 205 within a certain frequency range can be obtained.

[0026] Because the degree of IEEE and SRRC regulatory requirements (i.e., the degree of out-of-band spurious emission suppression) varies across different frequency ranges, in one implementation, the spectral constraints to be met can be determined using the location of a specific operating frequency band of the communication system or device. For example, strict out-of-band spurious emission suppression is required at the edge frequencies of the 2.4 GHz band (e.g., channels 1 and 13), while normal out-of-band spurious emission suppression can be applied to other frequencies (e.g., channels 2-12).

[0027] In related technologies, low-order filters can be used to achieve ordinary out-of-band spurious suppression, while high-order filters can be used to achieve strict out-of-band spurious suppression.

[0028] Figure 3 is a schematic diagram of the frequency-amplitude response variation of a certain channel X under different out-of-band spurious suppression methods. As shown in Figure 3, ordinary out-of-band spurious suppression is achieved by applying stopband slow-down filtering behavior to the right side of channel X (corresponding to amplitude response curve 301), and strict out-of-band spurious suppression is achieved by applying stopband fast-attenuation filtering behavior to the right side of channel X (corresponding to amplitude response curve 302).

[0029] Based on the above, a baseband chip is provided in an embodiment of the present invention. Figure 4 is a schematic diagram of the structure of the baseband chip according to an embodiment of the present invention. As shown in Figure 4, the baseband chip includes: a pre-compensator 1 and a low-order filter 2.

[0030] Among them, the low-order filter 2 is used to filter the target signal to obtain the transmitted signal and send the transmitted signal to the radio frequency unit 3. The low-order filter 2 is determined based on the out-of-band spurious suppression level requirement of the target channel, which is a communication channel used to transmit the transmitted signal.

[0031] Pre-compensator 1 is used to pre-compensate the baseband signal based on pre-compensation parameters to obtain the target signal, so as to compensate for the in-band distortion caused by the low-order filter 2 filtering the target signal. The pre-compensation parameters are determined based on the parameters of the low-order filter 2.

[0032] In one exemplary embodiment, the baseband signal is pre-compensated by pre-compensator 1 based on pre-compensation parameters to obtain the target signal. A low-order filter 2 filters the target signal to obtain the transmitted signal, which is then sent to the radio frequency unit 3. The radio frequency unit 3 then transmits the obtained transmitted signal to the receiving end.

[0033] By adopting the above technical solution, the target signal is filtered using a low-order filter 2 to obtain the transmitted signal, which effectively suppresses out-of-band spurious signals and avoids the baseband chip area occupation problem caused by using a high-order filter. Compared with a high-order filter, the low-order filter 2 occupies a smaller chip area, which helps to achieve the miniaturization of the baseband chip.

[0034] However, the low-order filter 2 may cause in-band distortion to the target signal during the filtering process. To address this issue, embodiments of the present invention introduce a pre-compensator 1, which performs pre-compensation processing on the baseband signal based on pre-compensation parameters to compensate for the in-band distortion caused by the low-order filter 2 filtering the target signal. The pre-compensation parameters are determined based on the parameters of the low-order filter 2, thus ensuring that the pre-compensator 1 can effectively compensate for the distortion during the filtering process.

[0035] By combining the low-order filter 2 with the pre-compensator 1, this invention reduces the area occupied by the baseband chip while ensuring out-of-band spurious suppression, thus solving the problem of difficulty in meeting the miniaturization requirements of baseband chips in related technologies. This achieves the effect of both improving communication quality and meeting the design requirements of baseband chip miniaturization.

[0036] Figure 5 is a schematic diagram illustrating the out-of-band spurious suppression effect achieved by combining the pre-compensator 1 and the low-order filter 2 according to an embodiment of the present invention. As shown in Figure 5, amplitude curve 501 can be obtained based on the pre-compensator 1, and amplitude curve 502 can be obtained based on the low-order filter 2. Therefore, the baseband signal can be pre-compensated based on the pre-compensator 1 to obtain the target signal. The target signal is then filtered based on the low-order filter 2 to obtain the transmitted signal. Thus, since the pre-compensator 1 pre-compensates the in-band distortion caused by the low-order filter 2 filtering the target signal, the in-band distortion can be canceled by using the low-order filter 2 to filter the target signal, thereby achieving the amplitude response corresponding to the superimposed amplitude curve 403.

[0037] In one embodiment, FIG6 is a second schematic diagram of the structure of a baseband chip according to an embodiment of the present invention. As shown in FIG6, the baseband chip further includes: a controller 4, used to determine a low-order filter 2 based on the suppression level requirement; and / or, used to determine pre-compensation parameters based on the parameters of the low-order filter 2.

[0038] In one exemplary embodiment, the matching relationship between the suppression level requirement and the low-order filter 2 can be stored in the controller 4, and program code for identifying the suppression level requirement can be compiled to determine the corresponding low-order filter 2 based on the suppression level requirement. The matching relationship between the parameters of the low-order filter 2 and the pre-compensation parameters can also be stored to determine the pre-compensation parameters based on the parameters of the low-order filter 2.

[0039] Therefore, firstly, by intelligently selecting filters and setting pre-compensation parameters, controller 4 can optimize the entire filtering and pre-compensation process. This helps reduce the area occupied by the baseband chip while maintaining out-of-band spurious suppression, thus achieving miniaturization of the baseband chip. Secondly, the intelligent decision-making of controller 4 helps improve communication quality. By precisely controlling the filtering and pre-compensation process, signal distortion can be reduced and signal purity improved, thereby enhancing the overall performance of the communication system. Moreover, controller 4 can adjust the filter and pre-compensation parameters according to the regulatory requirements of different countries and regions (such as IEEE and SRRC), ensuring the global compliance of communication equipment. Therefore, controller 4 implements intelligent management of low-order filter 2 and pre-compensator 1 in the baseband chip to meet different spectral constraints and communication quality requirements, while optimizing the performance and size of the baseband chip. This design not only improves the efficiency and performance of communication equipment but also helps reduce costs and power consumption, meeting the demands of modern communication equipment for miniaturization and high performance.

[0040] Of course, it should be noted that the selection of the low-order filter 2 and the selection of the pre-compensation parameters can also be determined manually.

[0041] In one embodiment, the controller 4 is further configured to: determine the parameters of the low-order filter 2 based on the suppression level requirement, wherein the parameters of the low-order filter 2 include the order and impulse response.

[0042] In one exemplary implementation, for example, the order of the low-order filter 2 can be represented by n, and the impulse response can be represented by h(n). The controller 4 determines the order and impulse response of the low-order filter 2 based on the out-of-band spurious suppression level requirements, achieving multiple benefits such as more accurate out-of-band spurious suppression, optimized filtering performance, improved flexibility and adaptability, reduced hardware costs, improved energy efficiency, reduced in-band distortion, and simplified design and debugging. These effects work together to improve the overall performance and market competitiveness of communication equipment.

[0043] In one implementation, controller 4 is also used to: determine pre-compensation parameters based on order and impulse response.

[0044] In one exemplary embodiment, with the order and impulse response serving as parameters of the low-order filter 2, the pre-compensation parameters of the pre-compensator 1 can be obtained by the controller 4 based on the order and impulse response of the low-order filter 2. By accurately understanding the order and impulse response of the low-order filter 2, the controller 4 can calculate the specific impact of the low-order filter 2 on the signal, including changes in phase and amplitude. Thus, the pre-compensator 1 can more accurately predict and compensate for these changes, thereby reducing in-band distortion during the filtering process. Moreover, depending on the specific parameters of the filter, the controller 4 can adjust the pre-compensation parameters so that the filter suppresses out-of-band spurious signals while minimizing the impact on in-band signal quality. This helps improve the overall performance of the communication system.

[0045] In one embodiment, the controller 4 is further configured to: perform discrete-time fast Fourier transform processing on the impulse response to obtain pre-compensation parameters, wherein the independent variable of the impulse response is the order.

[0046] In one exemplary implementation, for example, controller 4 can calculate the pre-compensation parameters based on the following formula: u(i) = IFFT(h(n)), i = 0, 1, ..., N sc -1.

[0047] Where IFFT is the Discrete-Time Fast Fourier Transform processing function, N sc This represents the number of subcarriers.

[0048] Based on Discrete-Time Fast Fourier Transform (DFT) processing, controller 4 can accurately analyze the response of low-order filter 2 at different frequencies, thereby determining the impact of low-order filter 2 on the target signal, particularly in terms of in-band and out-of-band spurious suppression. Based on the results of the DFT processing, controller 4 can calculate precise pre-compensation parameters, which are used to compensate for in-band distortion that low-order filter 2 may introduce during filtering. By analyzing the frequency response of low-order filter 2, controller 4 can optimize the design of low-order filter 2 to better meet specific out-of-band spurious suppression requirements while reducing in-band distortion. The accurate calculation of pre-compensation parameters helps improve communication quality because it reduces signal distortion caused by the filter, thereby improving signal clarity and reliability.

[0049] By adopting the above technical solution, the controller 4 is allowed to dynamically adjust the pre-compensation parameters according to the parameters and suppression level requirements of different low-order filters 2, thereby adapting to different communication environments and channel conditions.

[0050] In one embodiment, the controller 4 is further configured to: determine the in-band frequency range and suppression level requirements of the target channel based on preset requirements, wherein the suppression level requirements include a value of the transmit power that the communication device is allowed to leak to adjacent channels when communicating in the target channel.

[0051] In one exemplary implementation, the preset requirements may correspond to the regulatory requirements of SRRC and IEEE mentioned above. Controller 4 receives preset requirements from regulatory bodies (such as IEEE, SRRC, etc.), which define the in-band frequency range and permissible out-of-band spurious levels for different channels. Based on the preset requirements, the center frequency and bandwidth of each channel are determined, thereby defining the in-band frequency range. The out-of-band spurious suppression level for each channel is also determined based on the preset requirements, which typically includes the permissible transmit power leakage to adjacent channels. The parameters of the low-order filter 2 (such as order and impulse response) are automatically calculated or adjusted to meet specific suppression level requirements. Based on the parameters of the low-order filter 2, pre-compensation parameters are automatically calculated to compensate for in-band distortion that may occur during filtering. Furthermore, the performance of the communication equipment is monitored in real time, and the filter and pre-compensation parameters are dynamically adjusted according to the actual transmit power and spurious levels. Therefore, by precisely controlling the in-band frequency range and suppression level requirements, controller 4 not only ensures that communication equipment meets regulatory requirements, but also optimizes communication quality, improves energy efficiency, and helps to achieve miniaturization of baseband chips. This not only meets technical requirements but also brings economic benefits and enhances market competitiveness.

[0052] In one implementation, the pre-compensator 1 is also used to store pre-compensation parameters for recall during operation.

[0053] In one exemplary embodiment, the pre-compensation parameters can be determined in real time by the controller 4 based on the order and impulse response. The controller 4 stores the real-time pre-compensation parameters in the pre-compensator 1 so that the pre-compensator 1 can retrieve the pre-compensation parameters at any time.

[0054] In one embodiment, FIG7 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention. As shown in FIG7, the baseband chip further includes a storage module 5 for storing pre-compensation parameters so that the pre-compensator 1 can call the pre-compensation parameters when it is working.

[0055] In one exemplary embodiment, the pre-compensation parameters can be calculated online in real time, or they can be calculated offline and stored in the storage module 5, so that the pre-compensator 1 can retrieve the pre-compensation parameters from the storage module 5 at any time.

[0056] In one embodiment, FIG8 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention. As shown in FIG8, the baseband chip further includes a discrete-time fast Fourier transform (IFFT) unit 6, which is used to convert the target signal from a frequency domain signal to a time domain signal so that the low-order filter 2 can perform filtering processing on the target signal converted to a time domain signal.

[0057] In one exemplary implementation, the target signal, after being processed by the Discrete-Time Fast Fourier Transform (IFFT) unit 6, is converted from a frequency domain signal to a time domain signal, so that the low-order filter 2 can filter the converted time-domain target signal. Therefore, the low-order filter 2 can process the time-domain signal more effectively. Furthermore, through the IFFT unit 6, the low-order filter 2 can operate in its most suitable domain, thereby improving filtering efficiency and effectiveness. Thus, through accurate frequency-to-time domain conversion, the IFFT unit 6 helps improve the overall quality of the communication signal, reduce distortion, and ensure that the signal meets regulatory requirements.

[0058] In one implementation, the output of the Discrete-Time Fast Fourier Transform (IFFT) unit 6 can also be applied to the pre-compensator 1, which can adjust the signal based on the IFFT output to further compensate for the in-band distortion that may be introduced by the low-order filter 2.

[0059] In one embodiment, FIG9 is a schematic diagram of the structure of a baseband chip according to an embodiment of the present invention. As shown in FIG9, the baseband chip further includes a signal generation unit 7 for generating baseband signals.

[0060] In one exemplary embodiment, the signal generation unit 7 may include a signal source, which may be a digital signal processor (DSP), a microcontroller (MCU), or a dedicated signal generator. This signal source is responsible for generating raw digital signals, which may be data, voice, or other types of information. The generated raw signals may undergo certain processing to adapt to specific communication standards or protocols. This may include encoding, pre-modulation processing (such as constellation mapping, pulse shaping, etc.), and possible encryption. The modulation process may be simple, such as amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM), or more complex, such as orthogonal frequency division multiplexing (OFDM).

[0061] Of course, to ensure that the signal can be correctly demodulated at the receiving end, the signal generation unit 7 can also generate synchronization signals, such as clock signals and frame synchronization signals, which help the receiving end lock onto the signal from the transmitting end. The processed and modulated baseband signal will be output to subsequent hardware modules, such as digital-to-analog converters (DACs), or sent directly to the compensation low-order filter 2 for pre-compensation.

[0062] In one implementation, the activation and deactivation of the pre-compensator 1 are determined based on the out-of-band spurious suppression level requirement of the target channel, so that the pre-compensator 1 works in conjunction with the low-order filter 2 when activated, or so that the pre-compensator 1 uses the low-order filter 2 to filter the target signal when deactivated.

[0063] In one exemplary implementation, referring to Figure 2, for example, in a scenario where the spectrum template 200 allows for a relaxed spectral gradient in the left region of channel 13, the pre-compensator 1 can be set to the off state to allow the low-order filter 2 to perform filtering, achieving a general suppression effect on out-of-band spurious signals. For example, in a scenario where channel 13 is primarily constrained by the IEEE regulatory requirements of the spectrum template 202 to maintain a constant amplitude, the pre-compensator 1 can also be set to the off state to allow the low-order filter 2 to perform filtering, achieving a general suppression effect on out-of-band spurious signals. For example, in a scenario where the spectrum template 204 requires a strict spectral gradient in the right region of channel 13, the pre-compensator 1 can be set to the on state, first performing pre-compensation processing on the baseband signal based on pre-compensation parameters to compensate for the in-band distortion caused by the low-order filter 2 filtering the target signal. The target signal is then filtered again using low-order filter 2 to obtain the transmitted signal. This effectively suppresses out-of-band spurious signals, achieving out-of-band spurious suppression effects equivalent to or even exceeding those of high-order filters, while avoiding the baseband chip area occupation problem caused by using high-order filters. Of course, the correspondence between the above suppression level requirements and pre-compensator 1 can be stored in controller 4, allowing controller 4 to control the pre-compensator 1 to be turned on or off based on the corresponding suppression level requirements.

[0064] In an embodiment of the present invention, a transmitter is also provided, including a baseband chip as described above, and a radio frequency unit for transmitting a transmission signal.

[0065] In an embodiment of the present invention, a terminal device is also provided, including the transmitter as described above.

[0066] In one exemplary implementation, the terminal device can be a personal computer, laptop, tablet, smartphone, smartwatch, smart home device, router, switch, etc.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A baseband chip, comprising: A low-order filter is used to filter the target signal to obtain a transmitted signal, and the transmitted signal is sent to the radio frequency unit. The low-order filter is determined based on the out-of-band spurious suppression level requirement of the target channel, and the target channel is a communication channel used to transmit the transmitted signal. A pre-compensator is used to pre-compensate the baseband signal based on pre-compensation parameters to obtain the target signal, thereby compensating for the in-band distortion caused by the low-order filter filtering the target signal, wherein the pre-compensation parameters are determined based on the parameters of the low-order filter.

2. The baseband chip according to claim 1, wherein, Also includes: A controller is configured to determine the low-order filter based on the suppression level requirement; And / or, The pre-compensation parameters are used to determine the parameters based on the parameters of the low-order filter.

3. The baseband chip according to claim 2, wherein, The controller is further configured to: determine the parameters of the low-order filter based on the suppression level requirement, wherein the parameters of the low-order filter include the order and impulse response.

4. The baseband chip according to claim 3, wherein, The controller is also configured to: determine the pre-compensation parameters based on the order and the impulse response.

5. The baseband chip according to claim 4, wherein, The controller is further configured to: perform discrete-time fast Fourier transform processing on the impulse response to obtain the pre-compensation parameters, wherein the independent variable of the impulse response is the order.

6. The baseband chip according to claim 1, wherein, The pre-compensator is also used to store the pre-compensation parameters so that they can be called during operation.

7. The baseband chip according to claim 1, wherein, Also includes: A storage module is used to store the pre-compensation parameters so that the pre-compensator can call the pre-compensation parameters when it is working.

8. The baseband chip according to claim 1, wherein, Also includes: The Discrete-Time Fast Fourier Transform (IFFT) unit is used to convert the target signal from a frequency domain signal to a time domain signal, so that the low-order filter can perform filtering processing on the target signal converted to a time domain signal.

9. The baseband chip according to claim 1, wherein, Also includes: A signal generation unit is used to generate the baseband signal.

10. The baseband chip according to claim 1, wherein, The controller is also used for: The in-band frequency range of the target channel and the suppression level requirement are determined based on preset requirements, wherein the suppression level requirement includes a value of the transmit power that the communication device is allowed to leak to adjacent channels when communicating in the target channel.

11. A transmitter, comprising: The baseband chip as described in any one of claims 1 to 10; The radio frequency unit is used to transmit the transmitted signal.

12. A terminal device comprising the transmitter as described in claim 11.

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