Distributed antenna system for with one-way signal compensation function

Abstract

A distributed antenna system with unidirectional signal compensation includes a first device, a first signal compensation unit, and at least one second device. The first device receives radio frequency (RF) signals emitted by a base station and generates downlink signals. The first signal compensation unit selectively adjusts the RF signal strength to a preset signal strength. The second device receives the downlink signal via a coaxial cable and includes a second signal compensation unit. The second signal compensation unit detects the downlink signal to generate a measured signal strength. The second signal compensation unit generates a first loss value corresponding to the downlink signal based on the downlink signal frequency, downlink signal strength, and measured signal strength, and adjusts the downlink signal strength based on the first loss value so that the first device does not need to exchange signal strength data with the second device.

Description

Technical Field

[0001] This invention relates to the field of communications, and more particularly to a decentralized distributed antenna system with unidirectional signal compensation. Prior Technology

[0002] In recent years, various communication devices have been widely used in daily life. Taking smartphones as an example, when a smartphone transmits data or signals, it communicates with the base station via uplink and downlink signals, all through a wireless channel. However, the user's location and environmental factors can affect the transmission quality of the wireless channel. This is especially true when the user is indoors or in the basement of a building (such as an office building, residence, hotel, or hospital), where the base station's signal transmission is severely hampered, leading to poor communication quality or even signal loss. Therefore, existing technology has developed distributed antenna systems deployed within buildings to solve the problem of indoor communication signal coverage.

[0003] Generally, existing distributed antenna systems mostly employ a centralized control strategy for signal quality adjustment. Once the system is installed, the host unit used to receive the base station's RF signals enters calibration mode. The host unit uses a built-in or external fixed-power calibration signal to query and test the power reception status of each antenna communication device. If the test signal power does not reach the predetermined value, the host unit notifies each antenna communication device to perform signal calibration to compensate for signal loss caused by wiring or other devices. However, when the system enters calibration mode, the actual communication signal must be shut down first, which may cause communication interruptions, leading to system malfunction and reduced convenience. Furthermore, the more antenna communication devices there are, the longer the interruption time will be, thus reducing efficiency and increasing maintenance time and costs. Summary of the Invention

[0004] In view of this, the present invention provides a distributed antenna system with unidirectional signal compensation function. In one specific embodiment, the distributed antenna system with unidirectional signal compensation function includes a first device, a first signal compensation unit, and at least one second device. The first device is communicatively connected to a base station. The first device includes a communication interface for receiving radio frequency (RF) signals emitted by the base station and generating downlink signals based on the RF signals. The RF signals have RF signal strength, and the downlink signals have downlink signal frequency and downlink signal strength. The first signal compensation unit is coupled to the first device and pre-stores a preset signal strength corresponding to the communication interface. The first signal compensation unit is used to selectively adjust the RF signal strength of the RF signals to the preset signal strength. At least one second device is communicatively connected to the first device via at least one coaxial cable and is used to receive the downlink signals. Each second device includes a second signal compensation unit for detecting the downlink signals to generate a measured signal strength. The second signal compensation unit generates a first loss value for the corresponding downlink signal based on at least one coaxial line, downlink signal frequency, downlink signal strength, and measured signal strength, and adjusts the downlink signal strength of the downlink signal based on the first loss value.

[0005] The first signal compensation unit captures the radio frequency (RF) signal strengths of a plurality of RF signals and analyzes these RF signal strengths and a preset signal strength using machine learning to update the preset signal strength. The RF signal strength includes at least one of an idle RF signal strength and a maximum RF signal strength.

[0006] The distributed antenna system with unidirectional signal compensation further includes a power divider coupled to at least one coaxial cable. The first device transmits downlink signals to at least one second device via the power divider and the at least one coaxial cable.

[0007] The first device transmits a test signal with a test signal strength, and this test signal has the characteristic of extremely low loss on the coaxial cable. A second signal compensation unit detects the test signal to generate a measured test signal strength. The second signal compensation unit generates a second loss value based on the measured test signal strength and the test signal strength, and adjusts the downlink signal strength of the downlink signal based on the first loss value and the second loss value.

[0008] At least one second device is used to receive device signals from the third device and generate an uplink signal based on the device signals. The uplink signal includes an uplink signal frequency and an uplink signal strength. The second signal compensation unit generates a third loss value corresponding to the uplink signal based on a first loss value, a second loss value, a downlink signal frequency, and an uplink signal frequency, and adjusts the uplink signal strength of the uplink signal based on the third loss value.

[0009] The second device includes an antenna. A second signal compensation unit acquires and analyzes the measured signal strengths of a plurality of downlink signals to generate a target signal strength. The second signal compensation unit adjusts the downlink signal strength based on the target signal strength, and the antenna outputs the adjusted downlink signal.

[0010] Specifically, when the second device does not receive a downlink signal or the downlink signal strength is lower than a signal strength threshold, the antenna does not output a downlink signal.

[0011] The distributed antenna system with unidirectional signal compensation further includes a relay device that communicates with a first device and at least one second device. The first device transmits downlink signals to the relay device via a first optical fiber, and the relay device transmits downlink signals to at least one second device via at least one coaxial cable.

[0012] The second signal compensation unit generates a first loss value corresponding to the downlink signal based on the first optical fiber, at least one coaxial cable, downlink signal frequency, downlink signal strength, and measured signal strength.

[0013] In summary, the distributed antenna system with unidirectional signal compensation of the present invention can adaptively adjust the signal strength of the signal source through the first signal compensation unit, and can detect and adjust the signal strength of the signal source through machine learning to maintain signal quality. Furthermore, the distributed antenna system with unidirectional signal compensation of the present invention can compensate and correct the signal attenuation of the coaxial cable and power divider in real time through the second signal compensation unit, without requiring offline calibration by stopping the system or shutting down communication, thereby improving signal quality and reducing maintenance costs. In addition, the distributed antenna system with unidirectional signal compensation of the present invention adaptively adjusts and corrects the signal strength in each device in a decentralized manner, thereby improving efficiency and convenience. Simple Explanation of the Diagram

[0014]

[0015] Figure 1 is a functional block diagram illustrating a distributed antenna system with unidirectional signal compensation function according to a specific embodiment of the present invention.

[0016] Figure 2 is a schematic diagram illustrating the architecture of a distributed antenna system with unidirectional signal compensation function according to a specific embodiment of the present invention.

[0017] Figure 3 is a schematic diagram illustrating the architecture of a distributed antenna system with unidirectional signal compensation function according to a specific embodiment of the present invention.

[0018] Figure 4 is an architectural diagram of a distributed antenna system with unidirectional signal compensation function according to a specific embodiment of the present invention. Implementation

[0019] To make the advantages, spirit, and features of the present invention easier and clearer to understand, detailed descriptions and discussions will follow with reference to specific embodiments and the accompanying drawings. It is important to note that these specific embodiments are merely representative examples of the present invention, and the specific methods, apparatus, conditions, materials, etc., exemplified are not intended to limit the present invention or the corresponding specific embodiments.

[0020] The indefinite articles “a,” “an,” and “an” preceding the apparatus or element of this invention do not impose a limit on the quantity (i.e., the number of times) of the apparatus or element. Therefore, “a” should be interpreted as including one or at least one, and the singular form of apparatus or element also includes the plural form, unless the quantity clearly refers to the singular form.

[0021] Please refer to Figures 1 and 2 together. Figure 1 is a functional block diagram illustrating a distributed antenna system 1 with unidirectional signal compensation function according to a specific embodiment of the present invention. Figure 2 is an architectural diagram illustrating a distributed antenna system 1 with unidirectional signal compensation function according to a specific embodiment of the present invention. In this specific embodiment, the distributed antenna system 1 with unidirectional signal compensation function includes a first device 11, a first signal compensation unit 111, and a second device 12. The first device 11 is communicatively connected to a base station BS, the first signal compensation unit 111 is coupled to the first device 11, and the first device 11 is communicatively connected to the second device 12. As shown in Figure 2, the first device 11 is communicatively connected to four second devices (12A to 12D), but is not limited thereto. The number and connection pattern of the first and second devices are not limited to those shown in Figure 2. In practice, the base station BS can be a fixed high-power bidirectional transmitter that can emit radio frequency signals (RF signals). The radio frequency (RF) signal can be a 4G / 5G Time Division Duplex (TDD) signal, but it is not limited to this; the RF signal can also be a higher frequency signal. The RF signal can have both a frequency and a strength.

[0022] In this specific embodiment, the first device 11 includes a communication interface 110, which is used to receive radio frequency (RF) signals emitted by the base station (BS). The first device 11 generates downlink signals based on the RF signals, and the downlink signals have a downlink signal frequency. In practice, the first device 11 may be a main signal processing device, and the base station (BS) may communicate with the first device 11 via a cable connected to the communication interface 110. Further, the first device 11 can extract TDD timing signals and downlink signals from the RF signals. The TDD timing signals determine the time slots for uplink and downlink communication. The downlink communication mode signal represents the time sequence signal for the base station (BS) to transmit data, and the uplink communication mode signal represents the time sequence signal for the base station (BS) to receive data. In practice, the RF signal frequency of the RF signals may include, but is not limited to, the downlink signal frequency of the downlink signals. The first device 11 may also down-frequency and / or shift the radio frequency signal to generate a downlink signal, so that the downlink signal frequency is different from the radio frequency signal frequency, and that the downlink signal can be transmitted within a predetermined or specific signal frequency range.

[0023] In this specific embodiment, the first signal compensation unit 111 is coupled to the first device 11 and pre-stores a preset signal strength corresponding to the communication interface 110. The first signal compensation unit 111 is used to selectively adjust the radio frequency signal strength to the preset signal strength. In practice, the first signal compensation unit 111 can be an analysis and calculation chip connected to a power amplifier or attenuator (not shown), or it can be a chip in a power amplifier or attenuator to adjust the radio frequency signal strength. In practical applications, both the first signal compensation unit 111 and the power amplifier or attenuator can be disposed outside the first device 11. The first signal compensation unit 111 can control the power amplifier or attenuator to adjust the radio frequency signal strength according to the radio frequency signal received by the communication interface 110. In one specific embodiment, at least one of the first signal compensation unit 111 and the power amplifier or attenuator can also be disposed inside the first device 11.

[0024] In practice, the communication interface 110 can correspond to a radio frequency signal in a frequency band, and the preset signal strength can be the signal strength value or signal strength range value corresponding to the optimal transmission efficiency of the corresponding frequency band. When the communication interface 110 receives a radio frequency signal emitted by the base station BS, the first signal compensation unit 111 will detect the radio frequency signal strength and adjust the radio frequency signal strength according to the preset signal strength.

[0025] In this specific embodiment, the first signal compensation unit 111 generates and updates the preset signal strength through machine learning. In practice, when the communication interface 110 receives a radio frequency signal from the base station BS each time, the first signal compensation unit 111 captures and records the radio frequency signal strength as historical data. The radio frequency signal strength may include, but is not limited to, idle radio frequency signal strength, maximum radio frequency signal strength, and standard radio frequency signal strength. The first signal compensation unit 111 analyzes multiple radio frequency signal strengths through machine learning to generate and update the preset signal strength. In practice, the first signal compensation unit 111 can analyze multiple radio frequency signal strengths to generate and update the preset signal strength through supervised learning, unsupervised learning, semi-supervised learning, reinforcement learning, linear search algorithm, sequential search algorithm, interpolation search algorithm, etc. Next, the first signal compensation unit 111 controls the power amplifier or attenuator to adjust the RF signal strength to a preset signal strength in order to maintain the signal power quality of the signal source.

[0026] It is worth noting that the first device 11 of the distributed antenna system 1 in Figure 1 shows only one communication interface 111. In practical applications, the first device 11 may include multiple communication interfaces, and each communication interface may receive radio frequency signals from different frequency bands. The first signal compensation unit 111 may capture the radio frequency signal strength of the radio frequency signals from different communication interfaces, and generate and update the preset signal strength corresponding to each communication interface. The preset signal strength of each communication interface may be exactly the same, partially the same, or completely different.

[0027] After the first signal compensation unit 111 adjusts the radio frequency signal strength to a preset signal strength, the first device 11 then determines the TDD timing signal from the radio frequency signal and performs down-frequency and / or frequency-shifting processing to generate a downlink signal. At this time, the downlink signal also has a downlink signal strength. Then, the first device 11 transmits the downlink signal to the second device 12 through the coaxial cable 14.

[0028] In this specific embodiment, the second device 12 includes a second signal compensation unit 122 and an antenna 123. The second signal compensation unit 122 is used to detect the downlink signal received by the second device 12 to generate a measurement signal strength, and the antenna 123 is used to transmit the downlink signal. In practice, the second device 12 may be an active antenna unit (AAU). Further, the second device 12 may also include a power amplifier or attenuator (not shown). The second signal compensation unit 122 may be an analysis and calculation chip connected to the power amplifier or attenuator, or it may be a chip in the power amplifier or attenuator. When the second device 12 receives the downlink signal transmitted by the first device 11 through the coaxial cable 14, the second signal compensation unit 122 will detect the signal strength of the downlink signal to generate a measurement signal strength. It is worth noting that, as shown in FIG2, the first device 11 is communicatively connected to four second devices (12A to 12D), and each second device may include a second signal compensation unit.

[0029] In this specific embodiment, the second signal compensation unit 122 generates a first loss value corresponding to the downlink signal based on at least one coaxial cable 14, the downlink signal frequency, the downlink signal strength, and the measured signal strength. In practice, when the first device 11 sends a downlink signal to the second device 12, the first device 11 also sends a signal strength record value corresponding to the downlink signal strength to the second device 12. The signal strength record value is the signal strength value when the first device 11 generates the downlink signal, i.e., the original transmission strength of the downlink signal. Further, the second signal compensation unit 122 can compare the downlink signal frequency, downlink signal strength (i.e., the signal strength record value), and measured signal strength between the first device 11 and the second device 12, and calculate the difference between the downlink signal strength and the measured signal strength to generate a first loss value corresponding to the downlink signal (i.e., the signal loss value of the coaxial cable 14 between the first device 11 and the second device 12). Then, the second signal compensation unit 122 can control the power amplifier or attenuator to adjust the downlink signal strength of the downlink signal based on the first loss value. In practical applications, the second signal compensation unit 122 can control the power amplifier or attenuator to adjust the downlink signal strength to the signal strength of the recorded signal strength value according to the first loss value, but it is not limited to this, and can also adjust the downlink signal strength to the signal strength predetermined by the second device 12.

[0030] Therefore, the distributed antenna system with unidirectional signal compensation function of the present invention can adaptively adjust the signal strength of the signal source through the first signal compensation unit, and can detect and adjust the signal strength of the signal source through machine learning to maintain signal quality. Furthermore, the distributed antenna system with unidirectional signal compensation function of the present invention can compensate and correct the signal attenuation of the coaxial cable in real time through the second signal compensation unit, without the need for offline correction by stopping the system or shutting down communication, thereby improving signal quality and reducing maintenance costs. In addition, the distributed antenna system with unidirectional signal compensation function of the present invention adaptively adjusts and corrects the signal strength in each device in a decentralized manner, thereby improving efficiency and convenience.

[0031] Please refer to Figures 1 and 3 together. Figure 3 is an architectural diagram of a distributed antenna system 1 with unidirectional signal compensation function according to a specific embodiment of the present invention, and Figure 3 is another embodiment of the distributed antenna system 1 with unidirectional signal compensation function of Figure 1. In this specific embodiment, the distributed antenna system 1 with unidirectional signal compensation function further includes at least one power divider 15 connected to a coaxial cable 14. As shown in Figure 3, the coaxial cable 14 may include multiple nodes, and second devices (12A to 12D) are respectively disposed on the nodes. The power divider 15 is disposed on the nodes to transmit the downlink signal transmitted by the first device 11 to the second device (such as the second device 12A) on the node, and can transmit the downlink signal to other second devices (such as the second device 12B) that are farther away from the first device 11. That is, the first device 11 transmits the downlink signal to the second devices (12A to 12D) through the power divider 15 and the coaxial cable 14.

[0032] In this specific embodiment, the first device 11 further sends a test signal with a test signal strength to the second device 12, and the second signal compensation unit 122 of the second device 12 detects the test signal to generate a measured test signal strength corresponding to the test signal. In practice, the test signal can be a low-frequency signal. When the first device 11 sends the test signal to the second device 12, the first device 11 also sends a recorded signal strength value corresponding to the test signal strength to the second device 12. Further, the second signal compensation unit 122 can generate a second loss value based on the measured test signal strength and the test signal strength. In practice, since the signal loss of low-frequency signals in cables is extremely small, the second signal compensation unit 122 can calculate the difference between the test signal strength and the measured test signal strength to generate a second loss value (i.e., the signal loss value of the power divider 15 between the first device 11 and the second device 12). Next, the second signal compensation unit 122 can further adjust the downlink signal strength based on the first loss value of the corresponding coaxial cable 14 and the second loss value of the corresponding power divider 15. Therefore, the distributed antenna system with unidirectional signal compensation function of the present invention can also compensate and correct the signal attenuation of the power divider in real time through the second signal compensation unit, thereby improving the accuracy of signal compensation and signal quality.

[0033] Furthermore, in this specific embodiment, the second signal compensation unit 122 acquires and analyzes the measured signal strengths of a plurality of downlink signals to generate a target signal strength. The second signal compensation unit 122 adjusts the downlink signal strength according to the target signal strength, and the antenna 123 outputs the adjusted downlink signal. In practice, each second device 12 may have an optimal signal coverage range R, and the optimal signal coverage range R corresponds to a target signal strength. When the second device 12 receives a downlink signal transmitted by the first device 11 each time, the second signal compensation unit 122 also records the downlink signal with the largest downlink signal strength as historical data. The second signal compensation unit 122 can analyze the plurality of downlink signal strengths through machine learning to generate the target signal strength. Furthermore, after the second signal compensation unit 122 adjusts the downlink signal strength according to the first loss value and the second loss value, the second signal compensation unit 122 can further adjust the downlink signal strength to the target signal strength so that the second device 12 can transmit the downlink signal with the best signal power, thereby achieving the best signal coverage range and improving signal quality.

[0034] In practical applications, when the first device 11 receives the radio frequency (RF) signal emitted by the base station BS, the first signal compensation unit 111 first determines whether the RF signal strength meets the preset signal strength, and selectively adjusts the RF signal strength to the preset signal strength. Then, the first device 11 generates a downlink signal based on the adjusted RF signal, and transmits the downlink signal and test signal to the second devices (12A to 12D) through the coaxial cable 14 and power divider 15. Further, the second signal compensation unit 122 of each second device (12A to 12D) analyzes and calculates the downlink signal and test signal based on the length of the coaxial cable 14 and the number of power dividers 15 to generate a first loss value and a second loss value corresponding to each second device (12A to 12D). Then, the second signal compensation unit 122 adjusts the downlink signal strength based on the first loss value and the second loss value corresponding to each second device (12A to 12D). Finally, the second signal compensation unit 122 can further adjust the downlink signal strength to the target signal strength so that the second device 12 can emit a downlink signal with optimal signal power and signal coverage.

[0035] Furthermore, in this specific embodiment, when the second device 12 does not receive a downlink signal or the downlink signal strength is lower than a signal strength threshold, the antenna 123 of the second device 12 does not output a downlink signal. In practice, the signal strength threshold can be the minimum signal strength at which the second device 12 can maintain signal quality. When the system front-end (e.g., the first device 11 or the base station BS) of this invention malfunctions and cannot transmit a downlink signal normally, or when the quality and power of the downlink signal are unstable, the antenna 123 of the second device 12 will shut down the output of the downlink signal to avoid the second device 12 outputting any abnormal signals that could cause interference.

[0036] The distributed antenna system with unidirectional signal compensation function of the present invention can compensate for both downlink and uplink signals. As shown in Figures 1 and 3, in this specific embodiment, the second device 12D is used to receive the device signal from the third device 13 and generate an uplink signal based on the device signal. The uplink signal includes the uplink signal frequency and the uplink signal strength. In practice, the third device 13 can be a user device with data communication transmission capabilities, such as a mobile phone, laptop, or tablet, and can communicate with the second device 12D wirelessly. The device signal may contain data to be transmitted to the base station (BS), and the device signal may have a device signal frequency.

[0037] Furthermore, the second signal compensation unit 122 calculates and generates a third loss value corresponding to the uplink signal based on the first loss value, the second loss value, the downlink signal frequency, and the uplink signal frequency, and adjusts the uplink signal strength according to the third loss value. In practice, the second signal compensation unit 122 adjusts the uplink signal strength based on the first loss value of the coaxial cable 14 and the second loss value of the corresponding power divider 15. Generally, the uplink signal frequency is different from the downlink signal frequency. Therefore, the second signal compensation unit 122 can calculate the ratio between the downlink signal frequency and the uplink signal frequency to generate a proportionality constant, and then calculate the coaxial cable loss value corresponding to the uplink signal frequency based on the coaxial cable loss value corresponding to the downlink signal frequency and the proportionality constant. Furthermore, since the loss value of the power divider 15 does not change with the signal frequency, the loss value of the power divider for the uplink signal is the same as that for the downlink signal. Next, the second signal compensation unit 122 sums the coaxial cable loss value corresponding to the uplink signal frequency and the power divider loss value to generate a third loss value corresponding to the uplink signal. Finally, the second signal compensation unit 122 adjusts the uplink signal strength according to the third loss value, and the second device 12D then transmits the uplink signal to the first device 11 through the coaxial cable 14 and the power divider 15. In practical applications, after the second device 12D receives the device signal from the third device 13 and generates an uplink signal, the second signal compensation unit 122 can adjust the uplink signal strength to the sum of the uplink signal strength, the third loss value, and the circuit loss value. The circuit loss value can be the signal loss value of the electronic components in the second device 12D. Therefore, when the second device 12D transmits the uplink signal to the first device 11 through the coaxial cable 14 and the power divider 15, the first device 11 can receive an unattenuated uplink signal to maintain signal quality.

[0038] Furthermore, the distributed antenna system with unidirectional signal compensation function of the present invention can handle not only the time-division duplex radio frequency signals of the aforementioned specific embodiments, but also the frequency-division duplex (FDD) radio frequency signals. In practice, the first device and the second device are used to generate downlink signal channels and uplink signal channels. The downlink signal channel corresponds to a downlink signal frequency, and the uplink signal channel corresponds to an uplink signal frequency, and the downlink signal frequency and the uplink signal frequency are staggered. The downlink signal frequency and the uplink signal frequency can be determined according to design or requirements. When the first device receives the FDD radio frequency signal (i.e., the downlink signal) emitted by the base station, the first signal compensation unit first determines whether the radio frequency signal strength meets the preset signal strength, and selectively adjusts the radio frequency signal strength to the preset signal strength. Then, the first device shifts the adjusted radio frequency signal to the downlink signal frequency, and transmits the radio frequency signal and the test signal to the second device through a coaxial cable and a power divider. Furthermore, the second signal compensation unit of the second device calculates the radio frequency signal and the test signal based on the length of the coaxial cable and the power divider to generate a first loss value and a second loss value corresponding to the second device, respectively. Then, the second signal compensation unit compensates for the downlink signal strength of the radio frequency signal based on the first loss value and the second loss value, and then adjusts the downlink signal strength to the target signal strength.

[0039] Furthermore, the second signal compensation unit of the second device can calculate the ratio between the downlink signal frequency and the uplink signal frequency to generate a proportionality constant, and then calculate the coaxial cable loss value corresponding to the uplink signal frequency based on the coaxial cable loss value corresponding to the downlink signal frequency and the proportionality constant. Next, the second signal compensation unit can sum the coaxial cable loss value corresponding to the uplink signal frequency and the power divider loss value to generate a third loss value corresponding to the uplink signal. When the second device receives the device signal (i.e., the uplink signal) from the third device, the second device can shift the device signal to the uplink signal frequency, and the second signal compensation unit can adjust the signal strength of the device signal to the sum of the uplink signal strength, the third loss value, and the circuit loss value. Therefore, when the second device transmits the uplink signal to the first device through the coaxial cable and the power divider, the first device can receive the unattenuated uplink signal.

[0040] Please refer to Figure 4. Figure 4 is an architectural diagram illustrating a distributed antenna system 2 with unidirectional signal compensation function according to a specific embodiment of the present invention, and Figure 4 also shows another embodiment of the distributed antenna system 2 with unidirectional signal compensation function. The difference between this specific embodiment and the aforementioned specific embodiment is that the distributed antenna system 2 with unidirectional signal compensation function in this specific embodiment further includes a relay device 26, located between the first device 21 and the second devices (22A to 22D) and communicatively connected to the first device 21 and the second devices (22A to 22D). Further, the distributed antenna system 2 with unidirectional signal compensation function further includes a first optical fiber 281 and a second optical fiber 282. The relay device 26 is connected to the first device 21 through the first optical fiber 281 and the second optical fiber 282, and is connected to the second devices (22A to 22D) through a coaxial cable 24 and a power divider 25. The downlink signal generated by the first device 21 can be transmitted sequentially through the first optical fiber 281, the repeater 26, the coaxial cable 24, and the power splitter 25 to the second device (22A to 22D). The uplink signal generated by the second device (22A to 22D) can be transmitted sequentially through the coaxial cable 24, the power splitter 25, the repeater 26, and the second optical fiber 282 to the first device 21.

[0041] In practice, when the downlink signal generated by the first device 21 is transmitted to the second device (22A to 22D), the second signal compensation unit of the second device (22A to 22D) generates a first loss value and a second loss value corresponding to the downlink signal based on the first optical fiber 281, coaxial cable 24, power divider 25, downlink signal frequency, downlink signal strength, and measured signal strength, and adjusts the downlink signal strength according to the first loss value and the second loss value. Similarly, when the second device 22D receives the device signal from the third device 23 and generates an uplink signal based on the device signal, the second signal compensation unit can also calculate a third loss value based on the first loss value, the second loss value, the uplink signal frequency, and the downlink signal frequency, and adjust the uplink signal strength according to the third loss value.

[0042] In summary, the distributed antenna system with unidirectional signal compensation of the present invention can adaptively adjust the signal strength of the signal source through the first signal compensation unit, and can detect and adjust the signal strength of the signal source through machine learning to maintain signal quality. Furthermore, the distributed antenna system with unidirectional signal compensation of the present invention can compensate and correct the signal attenuation of the coaxial cable and power divider in real time through the second signal compensation unit, without requiring offline calibration by stopping the system or shutting down communication, thereby improving signal quality and reducing maintenance costs. In addition, the distributed antenna system with unidirectional signal compensation of the present invention adaptively adjusts and corrects the signal strength in each device in a decentralized manner, thereby improving efficiency and convenience.

[0043] The detailed description of the preferred embodiments above is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the invention to the preferred embodiments disclosed above. Rather, the aim is to cover various modifications and equivalent arrangements within the scope of the patent claims made by this invention. Therefore, the scope of the patent claims made by this invention should be interpreted in the broadest possible sense based on the foregoing description, so as to cover all possible modifications and equivalent arrangements.

[0044] 1, 2: Distributed antenna system with unidirectional signal compensation function

[0045] 11, 21: First device

[0046] 110: Communication Interface

[0047] 111: First Signal Compensation Unit

[0048] 12, 12A to 12D, 22A to 22D: Second device

[0049] 122: Second signal compensation unit

[0050] 123: Antenna

[0051] 13, 23: Third device

[0052] 14, 24: Coaxial cable

[0053] 15, 25: Power divider

[0054] 26: Relay device

[0055] 281: First optical fiber

[0056] 282: Second optical fiber

[0057] BS: Base Station

[0058] R: Signal coverage area

Claims

1. A distributed antenna system with unidirectional signal compensation function, comprising: a first device communicatively connected to a base station, the first device including a communication interface for receiving a radio frequency (RF) signal emitted by the base station, and the first device for generating a downlink signal based on the RF signal, and for transmitting the downlink signal and a test signal, wherein the RF signal has an RF signal strength, the downlink signal has a downlink signal frequency and a downlink signal strength, and the test signal has a test signal strength; a first signal compensation unit coupled to the first device and pre-stored a preset signal strength corresponding to the communication interface, the first signal compensation unit being used to selectively adjust the RF signal strength of the RF signal to a preset value. The preset signal strength; and at least one second device, connected to the first device via at least one coaxial cable and used to receive the downlink signal and the test signal, each second device comprising: a second signal compensation unit for detecting the downlink signal and the test signal to generate a measured signal strength and a measured test signal strength, the second signal compensation unit generating a first loss value corresponding to the downlink signal based on the downlink signal frequency, the downlink signal strength, and the measured signal strength, and generating a second loss value based on the measured test signal strength and the test signal strength, the second signal compensation unit adjusting the downlink signal strength of the downlink signal based on the first loss value and the second loss value; wherein, The at least one second device is used to receive a device signal from a third device and generate an uplink signal based on the device signal. The uplink signal includes an uplink signal frequency and an uplink signal strength. The second signal compensation unit generates a proportional constant based on the downlink signal frequency and the uplink signal frequency, and generates a third loss value corresponding to the uplink signal based on the first loss value, the proportional constant, and the second loss value. The second signal compensation unit adjusts the uplink signal strength of the uplink signal based on the third loss value.

2. The distributed antenna system with unidirectional signal compensation function as described in claim 1, wherein the first signal compensation unit captures the radio frequency signal strength of a plurality of radio frequency signals, and analyzes the plurality of radio frequency signal strengths and the preset signal strength through machine learning to update the preset signal strength, wherein the radio frequency signal strength includes at least one of idle radio frequency signal strength and maximum radio frequency signal strength.

3. The distributed antenna system with unidirectional signal compensation function as described in claim 1 further includes a power divider coupled to the at least one coaxial line, wherein the first device transmits the downlink signal to the at least one second device through the power divider and the at least one coaxial line.

4. A distributed antenna system with unidirectional signal compensation function as described in claim 1, wherein the second device includes an antenna, the second signal compensation unit acquires the measured signal strengths of a plurality of downlink signals and analyzes the plurality of measured signal strengths to generate a target signal strength, the second signal compensation unit adjusts the downlink signal strength of the downlink signal according to the target signal strength, and the antenna outputs the adjusted downlink signal.

5. A distributed antenna system with unidirectional signal compensation function as described in claim 4, wherein the antenna does not output the downlink signal when the second device does not receive the downlink signal or the downlink signal strength is lower than a signal strength threshold.

6. The distributed antenna system with unidirectional signal compensation function as described in claim 1 further includes a relay device communicatively connected to the first device and the at least one second device, wherein the first device transmits the downlink signal to the relay device via a first optical fiber, and the relay device transmits the downlink signal to the at least one second device via the at least one coaxial cable.

7. A distributed antenna system with unidirectional signal compensation function as described in claim 6, wherein the second signal compensation unit generates the first loss value corresponding to the downlink signal based on the first optical fiber, the at least one coaxial cable, the downlink signal frequency, the downlink signal strength, and the measured signal strength.

Images