Signal sending device, system and method without radio frequency filter

Abstract

The invention provides a signal sending device, system and method without a radio frequency filter, and relates to the technical field of wireless signal transmission, the device comprises a signal control module, a pre-distortion processing module and a plurality of branches, each branch comprises a small power control unit and a power amplifier unit, the power amplification units of the branches are used for amplifying the power of the signals sent by the low-power control units of the branches; at least one branch in the plurality of branches is in an open state for signal transmission; under the condition that the interference generated by the signal sending device on other signal sending devices is not less than the out-of-band noise threshold of the signal sending device, the signal control module closes the opened shunt or reduces the gain of the small power control unit in the opened shunt; the interference of the signal sending device on other signal sending devices is reduced through the pre-distortion processing module, so that the interference of the signal sending device on other signal sending devices is reduced to an out-of-band noise threshold. The invention aims to improve the flexibility of signal transmission.

Description

Technical Field

[0001] This application relates to the field of wireless signal transmission technology, specifically to a signal transmission device, system, and method without a radio frequency filter. Background Technology

[0002] With the development of the low-altitude economy, low-altitude monitoring and control have become particularly important. In order to effectively utilize existing network equipment or signals and improve the adaptability of various equipment and signals to low-altitude networks, it is necessary to propose effective solutions to the problems existing in the current equipment and signals, so as to provide a solid and effective foundation for promoting the development of the low-altitude economy.

[0003] In current DTMB (Digital Terrestrial Television Multimedia Broadcasting) systems, to avoid interference from transmitted signals to other signals, filters are often added at the end to filter out out-of-band signals. While this approach solves the interference problem, it limits the flexibility of the equipment, requiring filter replacement when using different frequencies. This increases the difficulty of production, engineering installation, and maintenance. In addition, the insertion loss introduced by the filter also results in additional power consumption and increased power waste. Summary of the Invention

[0004] In view of this, this application provides a signal transmission device, system, and method without an RF filter. It aims to solve or partially solve the problems existing in the prior art.

[0005] The first aspect of this application provides a signal transmission device without radio frequency filter, including: a signal control module, a predistortion processing module, and multiple branches, each branch including a low power control unit and a power amplifier unit, wherein the power amplifier unit on one branch is used to amplify the power of the signal transmitted through the low power control unit on that branch; At least one of the multiple branches is in the open state to transmit signals; When the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold of the signal transmitting device, the signal control module closes the opened branch or reduces the gain of the low-power control unit in the opened branch, and the pre-distortion processing module reduces the interference generated by the signal transmitting device to other signal transmitting devices, so as to reduce the interference generated by the signal transmitting device to other signal transmitting devices to the out-of-band noise threshold.

[0006] The second aspect of this application provides a signal transmission system, including: a predistortion processing module for reducing interference caused by the signal transmission device to other signal transmission devices; and the signal transmission device without radio frequency filter described in the first aspect of this application.

[0007] A third aspect of this application provides a branch control method applied to a signal control module in a signal transmitting device without an RF filter. The signal transmitting device includes multiple branches, each branch including a low-power control unit and a power amplifier unit. The power amplifier unit on one branch amplifies the power of the signal emitted by the low-power control unit on that branch. The method includes: The signal transmission power of the signal transmitting device is obtained within the coverage area of ​​the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is obtained; the signal transmission power of the signal transmitting device increases with the increase of the gain of the low power control unit in each of the activated branches of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices decreases with the decrease of the gain of the low power control unit in each of the activated branches of the signal transmitting device. Set the default state of the low-power control unit in the plurality of branches to the off state; The low-power control units in the multiple branches are switched to the on state one by one. Whenever a low-power control unit in a branch is turned on, the gain of the low-power control unit is adjusted so that the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device. If the power of the transmitted signal of the signal transmitting device is equal to the power threshold of the signal transmitting device, and if the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold, then the gain adjustment of the low power control unit in all the activated branches is stopped, and the opening or closing of any branch is stopped. If the power of the transmitted signal from the signal transmitting device is equal to the power threshold of the signal transmitting device, and if the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, then a new branch is opened, and the gain of the low-power control unit in each opened branch is reduced one by one. Furthermore, the transmitted signal from the signal transmitting device is pre-distorted to reduce the interference generated by the signal transmitting device to other signal transmitting devices, so that the power of the transmitted signal from the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold. The transmitted signal from the signal transmitting device is obtained by combining the signals generated by each opened branch of the signal transmitting device at the operating frequency of the signal transmitting device.

[0008] The signal transmitting device without an RF filter provided in this application has the following advantages: The signal transmitting device without an RF filter provided in this application includes a signal control module and multiple branch circuits. Each branch circuit includes a low-power control unit and a power amplifier unit. The signal control module controls the switching of the branch circuits and the gain of the low-power control unit in each branch circuit based on the current interference generated by the signal transmitting device to other signal transmitting devices. Simultaneously, a pre-distortion processing module performs pre-distortion processing on the signal to further reduce out-of-band interference generated by the signal transmitting device to other signal transmitting devices, thereby achieving interference levels as low as the out-of-band noise threshold of the signal transmitting device. This signal transmitting device can control the interference generated by the transmitted signal to be below the out-of-band noise threshold of the signal transmitting device, thus eliminating the need for an additional filter at the end to remove out-of-band signals from the transmitted signal. This improves the flexibility of the device, eliminating the need to replace filters when using different frequency points (because the device of this application does not require additional filters). Furthermore, the absence of additional filters avoids insertion loss, thus preventing power waste. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a structural diagram illustrating a signal transmission device without a radio frequency filter according to one embodiment of this application; Figure 2This is a flowchart illustrating the branch control process in a signal transmitting device without an RF filter, as shown in one embodiment of this application. Figure 3 This is a schematic diagram illustrating a signal transmission system according to one embodiment of this application; Figure 4 This is a flowchart illustrating a branch control method according to one embodiment of this application. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] refer to Figure 1 , Figure 1 This is a structural diagram illustrating a signal transmission device without a radio frequency filter, as shown in one embodiment of this application. Figure 1 As shown, the device includes: a signal control module, a predistortion processing module, and multiple branches. Each branch includes a low-power control unit and a power amplifier unit. The power amplifier unit on one branch amplifies the power of the signal emitted by the low-power control unit on that branch. At least one of the multiple branches is in an active state for signal transmission. When the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold of the signal transmitting device, the signal control module closes the active branch or reduces the gain of the low-power control unit in the active branch. The predistortion processing module reduces the interference generated by the signal transmitting device to other signal transmitting devices to reduce the interference to the out-of-band noise threshold.

[0013] In this embodiment, the signal transmitting device without an RF filter provided in this application includes multiple branches arranged in parallel. Each branch includes a low-power control unit and a power amplifier unit. The power amplifier unit on one branch amplifies the power of the signal emitted by the low-power control unit on that branch before transmitting the signal. At least one branch of the signal transmitting device is in an active state for signal transmission. When the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold of the signal transmitting device, in order to reduce the interference, this application uses a signal control module to close the active branch to reduce interference, or reduces the gain of the low-power control unit in the active branch to reduce interference. Simultaneously, a pre-distortion processing module performs pre-distortion processing on the signal to further reduce the out-of-band interference generated by the signal transmitting device to other signal transmitting devices, ultimately reducing the interference to the out-of-band noise threshold.

[0014] The signal transmitting device without an RF filter provided in this application includes a signal control module and multiple branches. Each branch includes a low-power control unit and a power amplifier unit. The signal control module is used to control the switching of the branches and the gain of the low-power control unit in the branch to reduce the interference generated by the signal transmitting device to other signal transmitting devices to below the out-of-band noise threshold of the signal transmitting device, based on the current interference generated by the signal transmitting device to other signal transmitting devices. This signal transmitting device can control the interference generated by the transmitted signal to be below the out-of-band noise threshold of the signal transmitting device, thus eliminating the need for an additional filter at the end to remove out-of-band signals from the transmitted signal. This improves the flexibility of the device, as there is no need to replace the filter when the device uses different frequencies (because the device of this application does not require an additional filter). Furthermore, without an additional filter, insertion loss is avoided, thus preventing power waste.

[0015] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. In this signal transmitting device without an RF filter, the signal generating device further includes a monitoring module; the monitoring module monitors the transmitted signal power of the signal transmitting device at its operating frequency within the coverage area of ​​the signal transmitting device, and monitors the interference generated by the signal transmitting device to other signal transmitting devices; the transmitted signal power of the signal transmitting device increases with the increase of the gain of the low-power control unit in each activated branch of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices decreases with the decrease of the gain of the low-power control unit in each activated branch of the signal transmitting device; with the goal of the transmitted signal power of the signal transmitting device being equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices being less than the out-of-band noise threshold of the signal transmitting device, the signal control module controls the multiple branches.

[0016] In this embodiment, the signal generating device provided in this application may further include a monitoring module. This monitoring module first selects an operating frequency based on the signal coverage requirements of the device and the signal conditions within the coverage area, using preset selection criteria. It then calculates the out-of-band noise threshold for the signal transmitted by the device. When the interference generated by the device (i.e., one signal transmitting device) to other signal transmitting devices is lower than this out-of-band noise threshold, the out-of-band interference caused by the device will not affect other signal networks within the coverage area. The preset selection criteria are that the noise floor of the operating frequency should be as low as possible, ensuring that the out-of-band interference caused by the device will not affect other signal networks within the coverage area. Simultaneously, the monitoring module monitors the transmitted signal power of the signal transmitting device at the operating frequency within the coverage area of ​​the signal transmitting device, and also monitors the interference generated by the signal transmitting device to other signal transmitting devices. Both the transmitted signal power and the interference generated by the signal transmitting device to other signal transmitting devices, as monitored by the monitoring module, are provided to the signal control module. The transmission power of the signal transmitting device increases as the gain of the low-power control unit in each of the activated branches of the signal transmitting device increases, while the interference generated by the signal transmitting device to other signal transmitting devices decreases as the gain of the low-power control unit in each of the activated branches of the signal transmitting device decreases.

[0017] In one implementation, the monitoring module selects the operating frequency point based on preset selection criteria, including: the monitoring module traverses each candidate frequency point of the device, on the one hand, determining whether the signal transmitted by the device at the traversed candidate frequency point can meet the device's signal coverage requirements, and on the other hand, determining the interference caused by the signal transmitted by the device at the traversed candidate frequency point within the coverage area, and then determining the out-of-band noise threshold corresponding to the candidate frequency point; if the signal transmitted by the device at a candidate frequency point can meet the device's signal coverage requirements, and the out-of-band noise threshold corresponding to the candidate frequency point is the lowest among all candidate frequency points, then the candidate frequency point is determined as the device's operating frequency point.

[0018] In this embodiment, the signal control module calculates the power threshold of the transmitted signal based on the coverage requirements and operating frequency noise of the signal generator. Then, with the goal of the transmitted signal power of the signal generator being equal to its power threshold and the interference it generates to other signal generators being less than its out-of-band noise threshold, the signal control module controls multiple branches of the signal generator (e.g., switching branches on and off, adjusting the gain of the small power control unit in the active branch) to achieve this goal. The goal is that the transmitted signal power of the signal generator is equal to its power threshold, and the interference it generates to other signal generators is less than its out-of-band noise threshold.

[0019] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. In this signal transmitting device without an RF filter, the signal control module sets the default state of the low-power control units in the plurality of branches to a closed state; with the goal of the transmitted signal power of the signal transmitting device being equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices being less than the out-of-band noise threshold of the signal transmitting device, the signal control module controls the plurality of branches, including: determining the average gain of the low-power control units in a single branch of the plurality of branches based on the power threshold and out-of-band noise threshold of the signal transmitting device and the total number of the plurality of branches; turning on each branch of the plurality of branches, and adjusting the gain of the low-power control units in that branch to the average gain, thereby achieving the goal.

[0020] In this embodiment, in order to achieve the set goal (i.e., the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold of the signal transmitting device), this application provides an optional implementation of the signal control module controlling the branch.

[0021] Specifically, the signal control module sets the default state of the low-power control units in multiple branches of the signal transmitting device to the off state. Subsequently, all branches are turned on. At this point, based on the power threshold, out-of-band noise threshold, and the total number of branches of the signal transmitting device, the average gain of the low-power control units in each branch of the signal transmitting device is determined. Then, the signal control module turns on all branches of the signal transmitting device and adjusts the gain of the low-power control units in each branch to the determined average gain to achieve the set target.

[0022] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. In this signal transmitting device without an RF filter, the signal control module sets the default state of the low-power control units in the plurality of branches to a closed state; with the goal of the transmitted signal power of the signal transmitting device being equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices being less than the out-of-band noise threshold of the signal transmitting device, the signal control module controls the plurality of branches, including: switching the low-power control units in the plurality of branches to an open state one by one through the signal control module; whenever a low-power control unit in a branch is turned on, the signal control module adjusts the gain of the low-power control unit so that the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device; If the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold, then the gain adjustment of the low-power control units in all the activated branches is stopped, and the activation or deactivation of any branch is stopped; if the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, then a new branch is activated, and the gain of the low-power control units in the activated branches is adjusted one by one by the signal control module, and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module, so as to achieve the objective.

[0023] In this embodiment, the first requirement is to achieve the set objective (i.e., the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold of the signal transmitting device). Furthermore, to ensure good power amplifier efficiency, this application will enable as few branch circuits as possible. Based on this, this application provides another optional implementation of the signal control module controlling the branch circuits.

[0024] Specifically, the signal control module sets the default state of the low-power control units in multiple branches of the signal transmitting device to the off state. Then, the signal control module switches each low-power control unit in the multiple branches to the on state one by one. That is, only one low-power control unit in a branch is activated at a time. Whenever a low-power control unit in a branch is activated, the signal control module adjusts the gain of that low-power control unit. If the gain adjustment of that low-power control unit cannot satisfy the condition that the transmitted signal power of the signal transmitting device equals its power threshold, then another low-power control unit in another branch is activated, and its gain is adjusted again. Simultaneously, the pre-distortion processing module is activated throughout the adjustment process to pre-distort the signal and further reduce the out-of-band interference generated by the signal transmitting device on other signal transmitting devices, so that the transmitted signal power of the signal transmitting device equals its power threshold. In this way, the condition that the transmitted signal power of the signal transmitting device equals its power threshold is achieved by activating as few branches as possible.

[0025] After the transmission signal power of the signal transmitting device equals its power threshold, the relationship between the interference generated by the signal transmitting device to other signal transmitting devices and the out-of-band noise threshold is determined. If the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold, the control action ends; no branching is opened or closed, and no gain adjustment is made for the opened branching. If the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, a new branching is opened, and the gain of the small power control unit in each opened branching is gradually reduced by the signal control module to achieve the set target (i.e., the transmission signal power of the signal transmitting device equals its power threshold, and the interference generated by the signal transmitting device to other signal transmitting devices is less than its out-of-band noise threshold). Opening a new branching when the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold is to simultaneously achieve two conditions of the set target. This is because the current condition is that the transmitted signal power of the signal transmitting device is equal to its power threshold, but the interference it generates to other signal transmitting devices is less than the out-of-band noise threshold. If the gain of the low-power control unit in the currently activated branch is reduced to reduce interference, this will also reduce the transmitted signal power of the signal transmitting device, thus failing to meet the condition that the transmitted signal power is equal to its power threshold. Therefore, this application opens a new branch when the transmitted signal power of the signal transmitting device is equal to its power threshold, but the interference it generates to other signal transmitting devices is not less than the out-of-band noise threshold. At this time, the transmitted signal power can be increased to a certain extent. After opening the new branch, the gain of the low-power control unit in each activated branch is reduced by the signal control module, which can reduce both the transmitted signal power and the interference, thereby achieving the two conditions of the set target (i.e., the transmitted signal power of the signal transmitting device is equal to its power threshold, and the interference it generates to other signal transmitting devices is less than the out-of-band noise threshold).

[0026] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmission device without a radio frequency filter. In this signal transmitting device without an RF filter, the signal control module sequentially switches the low-power control units in the plurality of branches to the on state. Whenever a low-power control unit in a branch is turned on, the signal control module adjusts the gain of that low-power control unit so that the transmitted signal power of the signal transmitting device equals the power threshold of the signal transmitting device. This includes: turning on the first branch of the plurality of branches through the signal control module and gradually increasing the gain of the low-power control unit in the first branch; if the gain of the low-power control unit in the first branch has been adjusted to the maximum gain, and the transmitted signal power of the signal transmitting device is less than the power threshold, then turning on a new branch through the signal control module and gradually increasing the gain of the low-power control unit in the new branch, until the gains of the low-power control units in the first to (n-1)th branches of the signal transmitting device have all been adjusted to the maximum gain; and by gradually increasing the gain of the low-power control unit in the nth branch, the transmitted signal power of the signal transmitting device equals the power threshold of the signal transmitting device.

[0027] In this embodiment, an optional implementation method where the signal control module controls the low-power control units in multiple branches to switch to the on state one by one and adjust their gain is as follows: The signal control module sets the default state of the low-power control units in multiple branches of the signal transmitting device to the off state. Then, the signal control module controls the low-power control unit of the first branch of the signal transmitting device to switch to the on state. After turning on the low-power control unit in the first branch, the gain of the low-power control unit in the first branch is increased. After each adjustment, it is determined whether the transmission signal power of the signal transmitting device has increased to equal the power threshold of the signal transmitting device. If the transmission signal power of the signal transmitting device has not increased to equal the power threshold of the signal transmitting device, the gain of the low-power control unit in the first branch is further increased.

[0028] If, after adjusting the gain of the low-power control unit in the first branch to its maximum gain, the transmitted signal power of the signal transmitting device still does not increase to equal the power threshold of the signal transmitting device, then the signal control module controls the low-power control unit in the second branch of the signal transmitting device to switch to the on state. After activating the low-power control unit in the second branch, the gain of the low-power control unit in the second branch is increased. The adjustment method is the same as the gain adjustment method of the low-power control unit in the previous branch. That is, after each adjustment, it is determined whether the transmitted signal power of the signal transmitting device has increased to equal the power threshold of the signal transmitting device. If it is not equal, the gain of the low-power control unit in the second branch is further increased.

[0029] If, after adjusting the gain of the low-power control unit in the second branch to its maximum gain, the transmitted signal power of the signal transmitting device still does not increase to equal the power threshold of the signal transmitting device, then the signal control module controls the low-power control unit in the next branch of the signal transmitting device to switch to the on state. Using the same gain adjustment method, the gain of the low-power control unit in the newly opened branch is gradually increased until the gains of the low-power control units in the first to (n-1)th opened branches of the signal transmitting device have all been adjusted to their maximum gain. Then, the gain of the low-power control unit in the nth opened branch is gradually increased until the transmitted signal power of the signal transmitting device equals the power threshold of the signal transmitting device.

[0030] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. In this signal transmitting device without an RF filter, when the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, the activated branches among the plurality of branches include the 1st to the Nth activated branches; when the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, if the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, a new branch is activated, and the gain of the low-power control unit in each activated branch is gradually reduced by the signal control module; and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module to achieve the objective, including: activating the (N+1)th branch among the plurality of branches by the signal control module, and gradually reducing the gain of the (N+1)th branch by the signal control module. The gain of the low-power control unit in the N+1 enabled branch is adjusted, and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module to reduce the transmission signal power of the signal transmitting device; if the gain of the low-power control unit in the N+1 enabled branch has been adjusted to the minimum gain, and the transmission signal power of the signal transmitting device is not less than the power threshold, then the gain of the low-power control unit in the 1st to Nth enabled branch is reduced by the signal control module, and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module so that the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

[0031] In this embodiment, one possible implementation method where the signal control module controls the activation of a new branch and gradually reduces the gain of the low-power control unit in each activated branch is as follows: The current transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the activated branches among the multiple branches of the signal transmitting device include the 1st to the Nth activated branches. At this time, the signal control module activates a new branch, specifically the (N+1)th branch among the multiple branches. The signal control module then gradually reduces the gain of the low-power control unit in the (N+1)th activated branch. During the gain adjustment process, the pre-distortion processing module continuously performs pre-distortion processing on the signal to further reduce interference from the signal transmitting device to other signal transmitting devices. After each reduction of the gain of the low-power control unit in the (N+1)th activated branch, it is determined whether the transmission signal power of the signal transmitting device has decreased to equal the power threshold. If the gain of the low-power control unit in the (N+1)th activated branch has been adjusted to the minimum gain, but the transmission signal power of the signal transmitting device has not yet decreased to equal the power threshold, then the gain of the low-power control unit in the 1st to Nth activated branches is reduced by the signal control module. During this gain adjustment process, the predistortion processing module is also in a state of predistorting the signal to further reduce the interference of the signal transmitting device to other signal transmitting devices, so that the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference of the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

[0032] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. In this signal transmitting device without an RF filter, when the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, the enabled branches among the plurality of branches include the 1st to the Nth enabled branches; when the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, if the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, a new branch is enabled, and the gain of the low-power control unit in each enabled branch is gradually reduced by the signal control module, and the pre-distortion... The processing module reduces interference from the signal transmitting device to other signal transmitting devices to achieve the objective, including: activating the (N+1)th branch of the plurality of branches through the signal control module, and gradually reducing the gain of the low-power control unit in the (N+1)th activated branch through the signal control module; and reducing interference from the signal transmitting device to other signal transmitting devices through the pre-distortion processing module, thereby reducing the transmission signal power of the signal transmitting device; if the gain of the low-power control unit in the (N+1)th activated branch has been adjusted to the minimum gain, and the signal transmission... If the transmitted signal power of the transmitting device is not less than the power threshold, then the gain of the low-power control unit in the Nth activated branch is reduced by the signal control module, and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module, thereby reducing the transmitted signal power of the signal transmitting device and reducing the interference generated by the signal transmitting device to other signal transmitting devices; if the gain of the low-power control unit in the Nth activated branch has been adjusted to the minimum gain, and the transmitted signal power of the signal transmitting device is not less than the power threshold, or if the Nth If the gain of the low-power control unit in the activated branch has been adjusted to the minimum gain, and the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, then the gain of the low-power control unit in the (N-1)th activated branch is reduced by the signal control module, and the interference generated by the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module until the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

[0033] In this embodiment, another optional implementation method where the signal control module controls the activation of a new branch and gradually reduces the gain of the low-power control unit in each activated branch is as follows: The current transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the activated branches among the multiple branches of the signal transmitting device include the 1st to the Nth activated branches. At this time, the signal control module activates a new branch, specifically the (N+1)th branch among the multiple branches. The signal control module then gradually reduces the gain of the low-power control unit in the (N+1)th activated branch, while the pre-distortion processing module reduces interference from the signal transmitting device to other signal transmitting devices, thereby reducing the transmission signal power of the signal transmitting device. After each reduction of the gain of the low-power control unit in the (N+1)th activated branch, it is determined whether the transmission signal power of the signal transmitting device has decreased to equal the power threshold. If the gain of the low-power control unit in the (N+1)th activated branch has been adjusted to its minimum gain, but the transmission signal power of the signal transmitting device has not yet decreased to equal the power threshold, the signal control module gradually reduces the gain of the low-power control unit in the Nth activated branch. During the gain adjustment process, the predistortion processing module continuously performs predistortion processing on the signal to further reduce the interference generated by the signal transmitting device to other signal transmitting devices, thereby reducing the transmission signal power of the signal transmitting device and reducing the interference generated by the signal transmitting device to other signal transmitting devices. Similarly, after each reduction of the gain of the low-power control unit in the Nth activated branch, it is determined whether the transmission signal power of the signal transmitting device has decreased to equal the power threshold. Only if the transmission signal power of the signal transmitting device has not decreased to equal the power threshold will the gain of the low-power control unit in the Nth activated branch be further reduced.

[0034] If the gain of the low-power control unit in the Nth activated branch has been adjusted to the minimum gain, but the transmission signal power of the signal transmitting device still has not been reduced to the power threshold, then the same gain reduction method is used to gradually reduce the gain of the low-power control unit in the (N-1)th activated branch through the signal control module until the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold. Alternatively, if the gain of the low-power control unit in the Nth activated branch has been adjusted to the minimum gain, but the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, the same gain reduction method is used to gradually reduce the gain of the low-power control unit in the (N-1)th activated branch through the signal control module. During this gain adjustment process, the predistortion processing module is also in a state of predistorting the signal to further reduce the interference generated by the signal transmitting device to other signal transmitting devices, until the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

[0035] In conjunction with the above embodiments, in one implementation, this application also provides a signal transmitting device without an RF filter. This signal transmitting device without an RF filter further includes: a combining control unit; the combining control unit combines the signals generated by each activated branch of the signal transmitting device at the operating frequency of the signal transmitting device to obtain the transmitted signal of the signal transmitting device, and determines the power of the transmitted signal as the transmitted signal power of the signal transmitting device.

[0036] In this embodiment, the signal transmitting device further includes a combining control unit located after the power amplifier units of all branch circuits. This combining control unit combines the signals generated by the activated branch circuits at the operating frequency of the signal transmitting device to obtain the transmitted signal. The power of this transmitted signal is the transmitted signal power of the signal transmitting device. The signal control module controls the power amplifier section based on the transmitted signal power value and the out-of-band noise threshold value of the transmitted signal, such as... Figure 2 As shown, the power amplifier section comprises multiple branch and combiner control units in the signal transmitting device.

[0037] This application provides a signal transmitting device without an RF filter, such as... Figure 2As shown, branch control is performed by a signal control module, the core of which is controlling the switching and gain adjustment of the low-power control units in the branch. First, a new branch is opened. If two of the set target conditions are not met, the gain of the low-power control unit in the newly opened branch is adjusted. After adjusting the gain of the low-power control unit in the newly opened branch, it is determined whether the signal transmission power equals the power threshold.

[0038] If the signal transmission power equals the power threshold, the transmitted signal undergoes pre-calibration processing. After pre-calibration, it is determined whether the interference generated by this signal transmitting device to other signal transmitting devices is less than or equal to the out-of-band noise threshold. If the interference generated by this signal transmitting device to other signal transmitting devices is less than or equal to the out-of-band noise threshold, signal transmission proceeds. If the interference generated by this signal transmitting device to other signal transmitting devices is greater than the out-of-band noise threshold, a new branch is opened. If, after opening a new branch, the two conditions of the set target are still not met, the gain of the low-power control unit in the newly opened branch is adjusted. After adjusting the gain of the low-power control unit in the newly opened branch, it is determined whether the signal transmission power equals the power threshold.

[0039] If, after adjusting the gain of the low-power control unit in the newly activated branch, it is determined that the signal transmission power is not equal to the power threshold, but is less than the power threshold, then it is determined whether the gain of the low-power control unit in the newly activated branch has been adjusted to the maximum gain. If the gain of the low-power control unit in the newly activated branch has not been adjusted to the maximum, then the gain of the low-power control unit in the newly activated branch is increased. This continues until the maximum gain is reached. If the signal transmission power is still less than the power threshold after this process, then a new branch is activated, and its gain is adjusted to achieve the set target.

[0040] If, after adjusting the gain of the low-power control unit in the newly activated branch, it is determined that the signal transmission power is not equal to the power threshold, but is greater than the power threshold, then it is determined whether the gain of the low-power control unit in the newly activated branch has been adjusted to the minimum gain. If the gain of the low-power control unit in the newly activated branch has not been adjusted to the minimum gain, then the gain of the low-power control unit in the newly activated branch is further reduced. This continues until the gain is adjusted to the minimum. If the signal transmission power is still greater than the power threshold after adjustment, then it is determined whether the number of activated branches is equal to 1. If the number of activated branches is equal to 1, then pre-calibration processing is performed before signal transmission. If the number of activated branches is not equal to 1, then one branch is shut down, and the low-power control unit and power amplifier unit of that branch are shut down to reduce the signal transmission power.

[0041] Based on the same inventive concept, this application provides a signal transmission system, such as Figure 3 As shown, the system includes: a predistortion processing module for reducing interference from the signal transmitting device to other signal transmitting devices; and the signal transmitting device without a radio frequency filter as described in the first aspect of this application.

[0042] In this embodiment, as Figure 3 As shown, this application provides a signal transmission system including a DTMB signal modulation / predistortion processing module, a D / A converter, an up-converter, and a signal transmission device provided in this application. The signal transmission device includes a branch control / low-power control unit, a power amplifier unit, a switch and combiner control, a detection link, a signal control module, and a monitoring module. The monitoring module determines the operating frequency and provides this frequency to the signal control module. The interaction between the signal control module and the up-converter is as follows: based on the received operating frequency, the local oscillator frequency of the up-converter is precisely controlled, thereby ensuring that the center frequency of the finally transmitted radio frequency signal strictly falls on the operating frequency. The DTMB signal modulation / predistortion processing module is used for signal encoding and modulation, as well as predistortion processing of the signal. Predistortion processing reduces interference from the signal transmission device to other signal transmission devices, thereby improving efficiency. The D / A converter converts the predistorted digital I / Q signal into a true analog intermediate frequency signal, preparing for subsequent radio frequency processing.

[0043] Based on the same inventive concept, this application provides a branch control method applied to the signal control module of a signal transmitting device without an RF filter. The signal transmitting device includes multiple branches, each branch including a low-power control unit and a power amplifier unit. The power amplifier unit on one branch amplifies the power of the signal emitted by the low-power control unit on that branch, such as... Figure 4 As shown, the method includes: Step S01: Obtain the transmission signal power of the signal transmitting device within the coverage area of ​​the signal transmitting device, and obtain the interference generated by the signal transmitting device to other signal transmitting devices; the transmission signal power of the signal transmitting device increases with the increase of the gain of the low-power control unit in each of the activated branches of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices decreases with the decrease of the gain of the low-power control unit in each of the activated branches of the signal transmitting device; Step S02: Set the default state of the low-power control unit in the plurality of branch circuits to the off state; Step S03: Switch the low-power control units in the multiple branch circuits to the on state one by one. Whenever a low-power control unit in a branch circuit is turned on, adjust the gain of the low-power control unit so that the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device. Step S04: If the power of the transmitted signal of the signal transmitting device is equal to the power threshold of the signal transmitting device, and if the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold, then stop adjusting the gain of the low-power control unit in all the open branches, and stop opening or closing any branch. Step S05: If the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and if the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, then a new branch is opened, and the gain of the low-power control unit in each opened branch is reduced one by one. Furthermore, the transmitted signal of the signal transmitting device is pre-distorted to reduce the interference generated by the signal transmitting device to other signal transmitting devices, so that the transmitted signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold. The transmitted signal of the signal transmitting device is obtained by combining the signals generated by each opened branch of the signal transmitting device at the operating frequency of the signal transmitting device.

[0044] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily necessary for the embodiments of this application. As for the method embodiments, since they are basically similar to the system embodiments, the description is relatively simple; relevant details can be found in the descriptions of the system embodiments.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0048] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0049] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0050] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0051] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0052] The foregoing has provided a detailed description of a signal transmission device, system, and method without an RF filter provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A signal transmitting apparatus without a radio frequency filter, characterized by comprising: The device comprises: a signal control module, a pre-distortion processing module, a plurality of branches, each branch comprising a low-power control unit and a power amplifier unit, the power amplifier unit in one branch being used to amplify the power of the signal sent through the low-power control unit in the branch; at least one branch of the plurality of branches is in an open state to send signals; when the interference generated by the signal sending device to other signal sending devices is not less than the out-of-band noise threshold of the signal sending device, the signal control module is used to close the open branch or reduce the gain of the low-power control unit in the open branch, and the pre-distortion processing module is used to reduce the interference generated by the signal sending device to other signal sending devices, so as to reduce the interference generated by the signal sending device to other signal sending devices to the out-of-band noise threshold.

2. A signal transmitting apparatus without a radio frequency filter according to claim 1, characterized by The device further comprises a monitoring module; the monitoring module is used to monitor the transmission signal power of the signal sending device at the operating frequency point in the coverage area of the signal sending device, and monitor the interference generated by the signal sending device to other signal sending devices; the transmission signal power of the signal sending device increases with the increase of the gain of the low-power control unit in each open branch of the signal sending device, and the interference generated by the signal sending device to other signal sending devices decreases with the decrease of the gain of the low-power control unit in each open branch of the signal sending device; The signal control module controls the plurality of branches to achieve the target that the transmission signal power of the signal sending device is equal to the power threshold of the signal sending device, and the interference generated by the signal sending device to other signal sending devices is less than the out-of-band noise threshold of the signal sending device.

3. A signal transmitting apparatus without a radio frequency filter according to claim 1, characterized by The signal control module sets the default state of the low-power control unit in the plurality of branches to a closed state; The signal control module controls the plurality of branches to achieve the target that the transmission signal power of the signal sending device is equal to the power threshold of the signal sending device, and the interference generated by the signal sending device to other signal sending devices is less than the out-of-band noise threshold of the signal sending device, comprising: determining the average gain of the low-power control unit in each branch of the plurality of branches according to the power threshold and the out-of-band noise threshold of the signal sending device and the total number of the plurality of branches; opening each branch of the plurality of branches and adjusting the gain of the low-power control unit in the branch to the average gain to achieve the target.

4. A signal transmitting apparatus without a radio frequency filter according to claim 1, characterized by The signal control module sets the default state of the low-power control unit in the plurality of branches to a closed state; The signal control module controls the plurality of branches to achieve the target that the transmission signal power of the signal sending device is equal to the power threshold of the signal sending device, and the interference generated by the signal sending device to other signal sending devices is less than the out-of-band noise threshold of the signal sending device, comprising: switching the small power control units in the multiple branches to the on state one by one by the signal control module, and adjusting the gain of the small power control unit in each branch by the signal control module when the small power control unit in the branch is turned on, so that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device; if the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, switching on a new branch, and adjusting the gain of the small power control units in the switched-on branches one by one by the signal control module, and reducing the interference of the signal transmitting device to other signal transmitting devices by the pre-distortion processing module to achieve the target, when the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device. if the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, switching on a new branch, and adjusting the gain of the small power control units in the switched-on branches one by one by the signal control module, and reducing the interference of the signal transmitting device to other signal transmitting devices by the pre-distortion processing module to achieve the target, when the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device.

5. A signal transmitting apparatus without a radio frequency filter according to claim 4, characterized in that, switching the small power control units in the multiple branches to the on state one by one by the signal control module, and adjusting the gain of the small power control unit in each branch by the signal control module when the small power control unit in the branch is turned on, so that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, including: switching on the first branch in the multiple branches by the signal control module, and gradually increasing the gain of the small power control unit in the first branch; if the gain of the small power control unit in the first branch has been adjusted to the maximum gain, and the transmitting signal power of the signal transmitting device is less than the power threshold, switching on a new branch by the signal control module, and gradually increasing the gain of the small power control unit in the new branch, until the gain of the small power control units in the first to the n-1 switched-on branches of the signal transmitting device has been adjusted to the maximum gain, and gradually increasing the gain of the small power control unit in the n switched-on branch, so that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device.

6. A signal transmitting apparatus without a radio frequency filter according to claim 4, wherein if the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, switching on a new branch, and adjusting the gain of the small power control units in the switched-on branches one by one by the signal control module, and reducing the interference of the signal transmitting device to other signal transmitting devices by the pre-distortion processing module to achieve the target, when the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device. if the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, switching on a new branch, and adjusting the gain of the small power control units in the switched-on branches one by one by the signal control module, and reducing the interference of the signal transmitting device to other signal transmitting devices by the pre-distortion processing module to achieve the target, when the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device. opening the N+1th branch of the plurality of branches by the signal control module, gradually reducing the gain of the low power control unit in the N+1th opened branch by the signal control module, and reducing the interference generated by the signal transmitting device to other signal transmitting devices by the pre-distortion processing module, so as to reduce the transmitting signal power of the signal transmitting device; if the gain of the low power control unit in the N+1th opened branch has been adjusted to the minimum gain, and the transmitting signal power of the signal transmitting device is not less than the power threshold, then reducing the gain of the low power control unit in the 1st to Nth opened branches by the signal control module, and reducing the interference generated by the signal transmitting device to other signal transmitting devices by the pre-distortion processing module, so that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference generated by the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

7. A signal transmitting apparatus without a radio frequency filter according to claim 4, wherein In the case that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, the opened branches of the plurality of branches include the 1st to Nth opened branches; in the case that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, if the interference generated by the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, then opening a new branch, gradually reducing the gain of the low power control unit in the opened branch by the signal control module, and reducing the interference generated by the signal transmitting device to other signal transmitting devices by the pre-distortion processing module, so as to achieve the target, comprising: opening the N+1th branch of the plurality of branches by the signal control module, gradually reducing the gain of the low power control unit in the N+1th opened branch by the signal control module, and reducing the interference generated by the signal transmitting device to other signal transmitting devices by the pre-distortion processing module, so as to reduce the transmitting signal power of the signal transmitting device; if the gain of the low power control unit in the N+1th opened branch has been adjusted to the minimum gain, and the transmitting signal power of the signal transmitting device is not less than the power threshold, then reducing the gain of the low power control unit in the Nth opened branch by the signal control module, and reducing the interference generated by the signal transmitting device to other signal transmitting devices by the pre-distortion processing module, so as to reduce the transmitting signal power of the signal transmitting device and reduce the interference generated by the signal transmitting device to other signal transmitting devices; If the gain of the small power control unit in the Nth turned-on branch has been adjusted to the minimum gain, and the transmission signal power of the signal transmitting device is not less than the power threshold, or if the gain of the small power control unit in the Nth turned-on branch has been adjusted to the minimum gain, and the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, the gain of the small power control unit in the N-1th turned-on branch is reduced by the signal control module, and the interference of the signal transmitting device to other signal transmitting devices is reduced by the pre-distortion processing module, until the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference of the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold.

8. A signal transmitting apparatus without a radio frequency filter according to any one of claims 1 to 7, characterized by Also comprising: a combining control unit; the combining control unit combines the signals generated by each turned-on branch of the signal transmitting device at the operating frequency point of the signal transmitting device to obtain a transmission signal of the signal transmitting device, and determines the power of the transmission signal as the transmission signal power of the signal transmitting device.

9. A signal transmitting system, characterized by comprising: comprising: a pre-distortion processing module for reducing the interference of the signal transmitting device to other signal transmitting devices; and the signal transmitting device without radio frequency filter of any of claims 1-8.

10. A method for branch control, applied to a signal control module in a signal transmitting device without radio frequency filter, the signal transmitting device comprising a plurality of branches, each branch comprising a low power control unit and a power amplifier unit, the power amplifier unit in a branch being used to amplify the power of the signal sent through the low power control unit in the branch, characterized in that, The method comprises: obtaining the transmission signal power of the signal transmitting device in the coverage area of the signal transmitting device, and obtaining the interference of the signal transmitting device to other signal transmitting devices; the transmission signal power of the signal transmitting device increases with the increase of the gain of the small power control unit in each turned-on branch of the signal transmitting device, and the interference of the signal transmitting device to other signal transmitting devices decreases with the decrease of the gain of the small power control unit in each turned-on branch of the signal transmitting device; setting the default state of the small power control unit in the plurality of branches to the closed state; switching the small power control unit in the plurality of branches to the open state one by one, and adjusting the gain of the small power control unit in each branch to make the transmission signal power of the signal transmitting device equal to the power threshold of the signal transmitting device when the small power control unit in the branch is turned on; if the interference of the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold when the transmission signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, stopping the adjustment of the gain of the small power control unit in all turned-on branches, and stopping the turning on or turning off of any branch. In the case that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, if the interference of the signal transmitting device to other signal transmitting devices is not less than the out-of-band noise threshold, a new branch is opened, the gain of the small power control unit in the opened branch is reduced one by one, and the transmitting signal of the signal transmitting device is pre-distorted to reduce the interference of the signal transmitting device to other signal transmitting devices, so that the transmitting signal power of the signal transmitting device is equal to the power threshold of the signal transmitting device, and the interference of the signal transmitting device to other signal transmitting devices is less than the out-of-band noise threshold; the transmitting signal of the signal transmitting device is the signal obtained by combining the signals generated by each opened branch of the signal transmitting device at the operating frequency point of the signal transmitting device.

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