CN115296733A - Uplink combined signal anti-overflow method and device, DAS (data acquisition System) and storage medium - Google Patents
Uplink combined signal anti-overflow method and device, DAS (data acquisition System) and storage medium Download PDFInfo
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Abstract
The application relates to an uplink combined signal anti-overflow method, device, DAS system and storage medium, which is characterized in that signals of a plurality of uplink channels are obtained and are superposed to obtain a combined signal; judging whether the combined signal overflows or not; under the condition that the combined signal overflows, one target channel is selected from the plurality of uplink channels according to the overflow state of the combined signal, the gain coefficient of the target channel is adjusted, the problem of combined overflow of the uplink signals is solved, and the reliable anti-overflow effect is achieved.
Description
Technical Field
The present application relates to the field of optical fiber distribution systems, and in particular, to an uplink combining signal anti-overflow method, apparatus, DAS system, and storage medium.
Background
A conventional optical fiber distribution System (DAS) is composed of a near-end Unit (AU), an Extended Unit (EU), and a far-end Unit (RU). The downlink signal is sent out from the base station through the near-end unit, the extension unit and the far-end unit in sequence and finally through the antenna to complete the signal coverage; otherwise, the uplink signal is received by the antenna, sequentially passes through the remote unit, the expansion unit and the near-end unit, and finally is transmitted back to the base station. When a near-end unit is connected with a plurality of extension units or an extension unit is connected with a plurality of far-end units, signals of a plurality of uplink channels need to be superposed to obtain an uplink combined signal, and the uplink combined signal can overflow at a certain probability, so that signal distortion is caused, and demodulation is influenced.
In the related art, the superimposed signals are usually processed, but if the uplink combined signal is directly attenuated, the remote unit with the originally weak signal is also attenuated at the same time, which affects the demodulation of the signals uploaded by such remote units.
Aiming at the problem of uplink signal combination overflow in the related technology, no effective solution is provided at present.
Disclosure of Invention
In this embodiment, an uplink combining signal anti-overflow method, an uplink combining signal anti-overflow device, a DAS system, and a storage medium are provided to solve the problem of uplink signal combining overflow in the related art.
In a first aspect, in this embodiment, an uplink combined signal overflow prevention method is provided, and is applied to a DAS system, where the DAS system includes a near-end unit, an expansion unit, and a far-end unit, the near-end unit is connected to at least one expansion unit, each expansion unit is connected to at least one far-end unit, and the near-end unit and the expansion unit are respectively configured to superimpose signals of an accessed uplink channel to obtain a combined signal; the method comprises the following steps:
acquiring signals of a plurality of uplink channels, and superposing the signals of the plurality of uplink channels to obtain a combined signal;
judging whether the combined signal overflows or not;
and under the condition that the combined signal overflows, selecting one target channel from the plurality of uplink channels according to the overflow state of the combined signal, and adjusting the gain coefficient of the target channel.
In some embodiments, determining whether the combined signal overflows comprises:
comparing the IQ level of the combined signal with an overflow threshold value, and determining that the combined signal is in an upward overflow state under the condition that the IQ level of the combined signal is greater than the overflow threshold value; alternatively, the first and second electrodes may be,
and comparing the IQ level of the combined signal with an underflow threshold value, and determining that the combined signal is in a downward overflow state under the condition that the IQ level of the combined signal is smaller than the underflow threshold value.
In some embodiments, selecting one of the target channels from the plurality of uplink channels according to an overflow state of the combined signal, and adjusting a gain coefficient of the target channel includes:
under the condition that the combined signal is in an upward overflow state, selecting a first target channel with the largest signal amplitude from the plurality of uplink channels, and increasing a gain coefficient of the first target channel; alternatively, the first and second electrodes may be,
and under the condition that the combined signal is in a downward overflow state, selecting a second target channel with the largest gain coefficient from the plurality of uplink channels, and reducing the gain coefficient of the second target channel.
In some embodiments, selecting the first target channel with the largest signal amplitude from the plurality of uplink channels includes:
acquiring IQ levels of signals in the uplink channels;
and determining the first target channel with the maximum IQ level in the plurality of uplink channels.
In some embodiments, each of the upstream channels is provided with a digital attenuator;
increasing the gain factor of the first target channel comprises: increasing a digital attenuation value of a digital attenuator in the first target channel; alternatively, the first and second liquid crystal display panels may be,
reducing the gain factor of the second target channel comprises: reducing a digital attenuation value of a digital attenuator in the second target channel.
In some embodiments, acquiring signals of a plurality of uplink channels, and superimposing the signals of the plurality of uplink channels to obtain a combined signal includes:
carrying out sign bit extension on the signal data of each uplink channel;
and superposing the signal data of the plurality of uplink channels after sign bit expansion to obtain the combined signal.
In a second aspect, in this embodiment, an uplink combined signal anti-overflow device is provided, including: the output end of the gain control module is connected with the input end of the combining module, and the output end of the combining module is connected with the gain control module;
the combining module is configured to superimpose signals of a plurality of uplink channels to obtain a combined signal, and output the combined signal to the gain control module;
the gain control module is configured to receive signals of the plurality of uplink channels, detect the combined signal, select one target channel from the plurality of uplink channels according to an overflow state of the combined signal when the overflow of the combined signal is detected, and adjust a gain coefficient of the target channel.
In some of these embodiments, the gain control module comprises: the processor is connected with the digital attenuators and is used for controlling the digital attenuators.
In a third aspect, there is provided in this embodiment a DAS system including: the near-end unit is connected with at least one expansion unit, each expansion unit is connected with at least one far-end unit, and the near-end unit and the expansion units are respectively configured to superpose the accessed signals of the uplink channels to obtain a combined signal; wherein the near-end unit and/or the extension unit are configured to perform the uplink combined signal anti-overflow method of the first aspect.
In a fourth aspect, in the present embodiment, a storage medium is provided, on which a computer program is stored, and the program, when executed by a processor, implements the method for overflow prevention of uplink combined signal according to the first aspect.
Compared with the related art, the uplink combined signal anti-overflow method, the device, the DAS system, and the storage medium provided in this embodiment obtain signals of a plurality of uplink channels, and superimpose the signals of the plurality of uplink channels to obtain a combined signal; judging whether the combined signal overflows or not; under the condition that the combined signal overflows, one target channel is selected from the plurality of uplink channels according to the overflow state of the combined signal, the gain coefficient of the target channel is adjusted, the problem of combined overflow of the uplink signals is solved, and the reliable anti-overflow effect is achieved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more concise and understandable description of the application, and features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of a DAS system topology according to an embodiment of the present application;
fig. 2 is a flowchart of an overflow prevention method for an uplink combined signal according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the operation of the digital attenuator in one embodiment of the present application;
fig. 4 is a block diagram of an uplink combined signal overflow preventing device in an embodiment of the present application.
Detailed Description
For a clearer understanding of the objects, aspects and advantages of the present application, reference is made to the following description and accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the same general meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (including a reference to the context of the specification and claims) are to be construed to cover both the singular and the plural, as well as the singular and plural. The terms "comprises," "comprising," "has," "having," and any variations thereof, as referred to in this application, are intended to cover non-exclusive inclusions; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or modules, but may include other steps or modules (elements) not listed or inherent to such process, method, article, or apparatus. Reference throughout this application to "connected," "coupled," and the like is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. In general, the character "/" indicates a relationship in which the objects associated before and after are an "or". The terms "first," "second," "third," and the like in this application are used for distinguishing between similar items and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, fig. 1 is a schematic diagram of a DAS system according to an embodiment of the present application, and as shown in fig. 1, the system includes: the system comprises a near-end unit (AU), an Expansion Unit (EU) and a far-end unit (RU), wherein one or more expansion units can be connected under one near-end unit, a plurality of far-end units can be directly connected under one expansion unit, or a plurality of expansion units can be cascaded, the number of the expansion units connected under each near-end unit is limited, the number of the far-end units connected under each expansion unit is limited, and the number of the cascaded expansion units is limited. In this embodiment, a maximum of 4 extension units are connected below the near-end unit, a maximum of 6 remote units are connected below the extension unit, and a maximum of 4 extension units are cascaded. The near-end unit and the expansion unit are respectively configured to superpose the accessed signals of the uplink channel to obtain a combined signal.
The operation of the DAS system will be described below.
The principle of downlink signal transmission: the base station couples the signals to a near-end unit of the optical fiber distribution system through a coupler, the near-end unit forwards the signals to an extension unit connected below the base station through each optical fiber interface after processing a series of digital signals, the extension unit forwards the received signals to a far-end unit and a cascaded extension unit connected below the extension unit, and the far-end unit sends the signals out through an antenna after processing the series of digital signals.
The transmission principle of uplink signals: the far-end unit receives signals from the antenna, transmits the signals to the corresponding expansion units through optical fibers after a series of digital signal processing, the expansion units superpose the signals from the plurality of far-end units and upload the superposed signals to the near-end unit step by step, and the near-end unit superposes the signals from the plurality of expansion units, converts the superposed signals into analog signals through the DAC and finally transmits the analog signals to the base station.
In an embodiment, referring to fig. 2, an overflow prevention method for an uplink combined signal is provided, which is described by taking the method as an example of being applied to the extension unit in fig. 1, and includes the following steps:
step S101, obtaining signals of a plurality of uplink channels, and superposing the signals of the plurality of uplink channels to obtain a combined signal;
step S102, judging whether the combined signal overflows or not;
and step S103, under the condition that the combined signal overflows, selecting one target channel from the plurality of uplink channels according to the overflow state of the combined signal, and adjusting the gain coefficient of the target channel.
The overflow state comprises an upward overflow state and a downward overflow state, wherein the upward overflow state refers to the condition that the amplitude of the combined signal is greater than an overflow threshold value, and the downward overflow state refers to the condition that the amplitude of the combined signal is less than an underflow threshold value. How to handle the combined signal in different overflow states will be described below.
Illustratively, referring to fig. 1, RU11, RU12, RU13, and RU14 are connected below the eu11, the EU11 needs to superimpose signals of 4 uplink channels where the RU11, RU12, RU13, and RU14 are located, so as to obtain a combined signal. In a first period, if the EU11 detects that the combined signal is in an upward overflow state, the EU11 selects an uplink channel with the largest signal amplitude as a first target channel from the 4 uplink channels, and if the EU11 detects that the signal amplitude of the RU11 is the largest, the EU11 performs primary attenuation processing on the signal of the RU 11; in a second period, if the EU11 detects that the combined signal is still in an upward overflow state, the EU11 reselects an uplink channel with the largest signal amplitude as a first target channel from among the 4 uplink channels, and if the EU11 detects that the signal amplitude of the RU12 is the largest, the EU11 performs primary attenuation processing on the signal of the RU 12; the process is circulated until EU11 detects that the combined signal is out of the upward overflow state in the Nth period.
Exemplarily, in a first period, if the EU11 detects that the combined signal is in a downward overflow state, the EU11 selects an uplink channel with a largest gain factor as a second target channel from among 4 uplink channels, and if the EU11 detects that the gain factor of a channel in which the RU11 is located is largest, the EU11 performs attenuation release processing on the RU11 signal for one time; in a second period, if the EU11 detects that the combined signal is still in a downward overflow state, the EU11 reselects an uplink channel with a maximum gain coefficient as a second target channel from among the 4 uplink channels, and if the EU11 detects that the gain coefficient of a channel in which the RU12 is located is maximum, the EU11 performs attenuation release processing on the signal of the RU12 for one time; the process is circulated until EU11 detects that the combined signal is out of the overflow state in the Nth period.
In the above steps S101 to S103, the combined signal is detected in real time, and once the combined signal overflows, one of the target channels is selected from the multiple uplink channels according to the overflow state of the combined signal, and the gain coefficient of the target channel is adjusted to perform attenuation processing or attenuation release processing on the signal of the target channel. Further, the above steps S101 to S103 may be executed in a loop to take real-time protection measures for the overflow condition of the channel signal, wherein the gain factor may be increased or decreased in a step-wise manner according to a preset amplitude each time the gain factor of the target channel is adjusted. The embodiment avoids the excessive attenuation of the originally weak signal while preventing the overflow of the uplink combined signal, and gives the opportunity of preferential release to the signal with more attenuation, thereby solving the problem of the overflow of the uplink signal combined path and realizing the reliable anti-overflow effect.
In the related technology, whether the combined signal overflows or not is judged through the signal power (I ^2+ Q ^ 2), a large number of multipliers are needed for calculation, the resource cost of the multipliers is high, the calculation time is long, and delay exists in the overflow detection of the combined signal. To solve this problem, in one embodiment, the IQ level of the combined signal is compared with an overflow threshold value, and in case the IQ level of the combined signal is greater than the overflow threshold value, it is determined that the combined signal is in an upward overflow state. Optionally, the IQ level of the combined signal is compared with an underflow threshold, and it is determined that the combined signal is in a downward overflow state under the condition that the IQ level of the combined signal is smaller than the underflow threshold. In this case, IQ (In-Phase Quadrature) refers to an In-Phase Quadrature signal. Compared with the related art, the embodiment judges whether the combination signal overflows by comparing the magnitude of the IQ level, so that the multiplier resource can be saved, and meanwhile, the overflow detection speed of the combination signal is improved.
In one embodiment, the extension unit obtains an IQ level of a signal in each uplink channel, and determines a first target channel with the largest IQ level among the plurality of uplink channels. The first target channel is screened by comparing the magnitude of the IQ level, so that multiplier resources can be saved, and the screening speed is increased.
Illustratively, the EU11 compares the IQ levels of the RUs 11, 12, 13, 14 to obtain the maximum IQ level of the RU11, and determines the channel in which the IQ RU11 is located as the first target channel.
In one embodiment, each upstream channel is provided with a digital attenuator. Referring to fig. 3, fig. 3 is a schematic diagram illustrating an operation principle of the digital attenuator in the present embodiment, wherein a digital attenuation value att _ Val is set in the digital attenuator, and when IQ data _ IQ1 is input, att _ Val is multiplied by data _ IQ1 to output IQ data _ IQ2. Wherein the IQ data includes IQ level.
When the signal needs to be attenuated, the attenuation can be realized by increasing the digital attenuation value of the digital attenuator; when the signal needs to be subjected to attenuation release processing, the attenuation release processing can be realized by reducing the digital attenuation value of the digital attenuator.
Since the bit width of the binary signals transmitted in the communication system is fixed, in this case, the summation of multiple binary numbers may result in that the fixed bit width does not correctly represent the result of signal superposition, resulting in overflow. To solve the problem, in an embodiment, acquiring signals of a plurality of uplink channels, and superimposing the signals of the plurality of uplink channels to obtain a combined signal includes: carrying out sign bit extension on IQ data output by each uplink channel; and superposing the IQ data of the plurality of uplink channels after sign bit expansion to obtain a combined signal.
Taking signed IQ data with 12bit input as an example, sign bit expansion is firstly carried out on 12bit IQ data to generate a 16bit wide signed number, then each 16bit channel IQ data is superposed, and a superposed combined signal is the 16bit signed number to support 16 channel signed IQ data superposition. The expansion unit judges each received IQ data, and assumes 12-bit signed IQ data to be 0dB at full amplitude, and can set an overflow threshold value to be-6 dB and an underflow threshold value to be-7.5 dB.
According to the arrangement, the high-bit sign bit of the summed binary number is expanded, and then the summation operation is carried out, so that the data overflow is avoided.
The uplink combined signal anti-overflow method of the present application is described below with preferred embodiments.
In one embodiment, the extension unit superimposes the received uplink signal, taking signed IQ data with 12-bit input as an example, sign bit extension is performed on 12-bit IQ data to generate a 16-bit-wide signed number, then each 16-bit channel IQ data is superimposed, and the superimposed combined signal is a 16-bit signed number to support the superimposition of 16-channel signed IQ data. The expansion unit judges each received IQ data, and assumes 12-bit signed IQ data to be 0dB at full amplitude, and can set an overflow threshold value to be-6 dB and an underflow threshold value to be-7.5 dB.
For signal attenuation, if the amplitude of the 16bit IQ data after combination exceeds-6 dB, the combination signal is considered to be overlarge, at the moment, the data of which channel in all channel signals is the largest is judged, then the amplitude attenuation of an internal digital domain is carried out on the largest channel signal, and the attenuation amplitude is 1dB each time. And at the next moment, carrying out the same judgment on the signals until the amplitude of the combined signal does not exceed-6 dB.
For signal attenuation release, if the amplitude of the 16-bit IQ data after combination is less than-7.5 dB, the combined signal is considered to be too small, and the original attenuated signal channel needs to be released, and 1dB is released each time. Principle of decay release: and releasing the original signal with the largest attenuation, and circularly judging the signal at the next moment until all the attenuations are released.
The scheme can be used for equipment with combiner overflow protection, is not limited to EU equipment, and is also suitable for AU equipment. All the attenuation and release are carried out in real time, and each data valid time is judged so as to ensure that the data transmitted to the upper stage is not in an overflow state.
Taking the device shown in EU35 as an example, all devices, i.e., RU33 to RU38, hung below the EU are subjected to processing of uplink combining overflow protection. For each RU device there is a respective digital attenuator, i.e. a respective att _ Val value, which is referred to in fig. 3.
In the first period, when the EU35 detects that the combined signal is greater than the overflow threshold, if the EU35 determines that the IQ level of the RU33 is maximum, the digital attenuation value of the channel where the RU33 is located is increased by 1dB.
In the second period, the EU35 detects that the combining signal is still greater than the overflow threshold value, and if the EU35 determines that the IQ level of the RU34 is the maximum, the digital attenuation value of the channel in which the RU34 is located is increased by 1dB.
And circulating in such a way until the combined signal is separated from an upward overflow state.
In the nth period, the signal starts to fall back, and when the EU35 detects that the combined signal is smaller than the underflow threshold, if the EU35 determines that the digital attenuation value of the channel in which the RU36 is located is maximum, the digital attenuation value of the channel is reduced.
In the (N + 1) th period, the EU35 detects that the combined signal is still smaller than the underflow threshold, and if the EU35 determines that the digital attenuation value of the channel in which the RU37 is located is maximum, the digital attenuation value of the channel is reduced.
And circulating in such a way until the combined signal is separated from a downward overflow state.
Based on the principle similar to that of the extension unit, the uplink combined signal anti-overflow method of the above embodiment may also operate in the near-end unit, which is not described in this application again.
In this embodiment, an uplink combined signal overflow preventing device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device is omitted for brevity. The terms "module," "unit," "subunit," and the like as used below may implement a combination of software and/or hardware for a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 4 is a block diagram of a structure of an overflow preventing device for uplink combined signals in this embodiment, and as shown in fig. 4, the device includes: the output end of the gain control module is connected with the input end of the combining module, and the output end of the combining module is connected with the gain control module. The combining module is configured to superimpose signals of the plurality of uplink channels to obtain a combined signal and output the combined signal to the gain control module; and the gain control module is configured to receive signals of the plurality of uplink channels, detect the combined signal, select one target channel from the plurality of uplink channels according to the overflow state of the combined signal and adjust the gain coefficient of the target channel under the condition that the overflow of the combined signal is detected.
In one embodiment, the gain control module comprises: the processor is connected with the plurality of digital attenuators and is used for controlling the plurality of digital attenuators.
In one embodiment, the uplink combined signal overflow preventing device may be implemented by using an FPGA, and the FPGA may be installed inside the extension unit and the near-end unit as a core component.
The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.
In addition, in combination with the uplink combined signal anti-overflow method provided in the foregoing embodiment, a storage medium may also be provided in this embodiment to implement the method. The storage medium having stored thereon a computer program; when being executed by a processor, the computer program realizes any one of the above-mentioned uplink combined signal anti-overflow methods.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be derived by a person skilled in the art from the examples provided herein without any inventive step, shall fall within the scope of protection of the present application.
It is obvious that the drawings are only examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application can be applied to other similar cases according to the drawings without creative efforts. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
The term "embodiment" is used herein to mean that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly or implicitly understood by one of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the patent protection. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. An uplink combined signal anti-overflow method is applied to a DAS (data acquisition System), the DAS comprises a near-end unit, an expansion unit and a far-end unit, the near-end unit is connected with at least one expansion unit, each expansion unit is connected with at least one far-end unit, and the near-end unit and the expansion unit are respectively configured to superpose signals of accessed uplink channels to obtain a combined signal; characterized in that the method comprises:
acquiring signals of a plurality of uplink channels, and superposing the signals of the plurality of uplink channels to obtain a combined signal;
judging whether the combined signal overflows or not;
and under the condition that the combined signal overflows, selecting one target channel from the plurality of uplink channels according to the overflow state of the combined signal, and adjusting the gain coefficient of the target channel.
2. The uplink combined signal anti-overflow method of claim 1, wherein determining whether the combined signal overflows comprises:
comparing the IQ level of the combined signal with an overflow threshold value, and determining that the combined signal is in an upward overflow state under the condition that the IQ level of the combined signal is greater than the overflow threshold value; alternatively, the first and second electrodes may be,
and comparing the IQ level of the combined signal with an underflow threshold value, and determining that the combined signal is in a downward overflow state under the condition that the IQ level of the combined signal is smaller than the underflow threshold value.
3. The method of claim 1, wherein selecting one of the plurality of uplink channels as a target channel according to an overflow status of the combined signal, and adjusting a gain factor of the target channel comprises:
under the condition that the combined signal is in an upward overflow state, selecting a first target channel with the largest signal amplitude from the plurality of uplink channels, and increasing a gain coefficient of the first target channel; alternatively, the first and second electrodes may be,
and under the condition that the combined signal is in a downward overflow state, selecting a second target channel with the largest gain coefficient from the plurality of uplink channels, and reducing the gain coefficient of the second target channel.
4. The upstream combined signal overflow prevention method of claim 3, wherein selecting the first target channel with the largest signal amplitude among the plurality of upstream channels comprises:
acquiring IQ levels of signals in the uplink channels;
and determining the first target channel with the maximum IQ level in the plurality of uplink channels.
5. The method according to claim 3, wherein each of the upstream channels is provided with a digital attenuator;
increasing the gain factor of the first target channel comprises: increasing a digital attenuation value of a digital attenuator in the first target channel; alternatively, the first and second electrodes may be,
reducing the gain factor of the second target channel comprises: reducing a digital attenuation value of a digital attenuator in the second target channel.
6. The uplink combined signal overflow preventing method according to any one of claims 1 to 5, wherein obtaining signals of a plurality of uplink channels, and superposing the signals of the plurality of uplink channels to obtain a combined signal includes:
carrying out sign bit extension on the signal data of each uplink channel;
and superposing the signal data of the plurality of uplink channels after sign bit expansion to obtain the combined signal.
7. The utility model provides an upward way signal anti-overflow goes out device which characterized in that includes: the output end of the gain control module is connected with the input end of the combining module, and the output end of the combining module is connected with the gain control module;
the combining module is configured to superimpose signals of a plurality of uplink channels to obtain a combined signal, and output the combined signal to the gain control module;
the gain control module is configured to receive signals of the plurality of uplink channels, detect the combined signal, select one target channel from the plurality of uplink channels according to an overflow state of the combined signal when the overflow of the combined signal is detected, and adjust a gain coefficient of the target channel.
8. The apparatus of claim 7, wherein the gain control module comprises: the processor is connected with the digital attenuators and is used for controlling the digital attenuators.
9. A DAS system, comprising: the near-end unit is connected with at least one expansion unit, each expansion unit is connected with at least one far-end unit, and the near-end unit and the expansion units are respectively configured to superpose the accessed signals of the uplink channels to obtain a combined signal; wherein the near-end unit and/or the extension unit are configured to perform the upstream combined signal overflow prevention method of any one of claims 1 to 6.
10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the upmix signal overflow prevention method of any of claims 1 to 6.
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| CN202210843079.9A CN115296733B (en) | 2022-07-18 | 2022-07-18 | Uplink combined signal anti-overflow method, device, DAS system and storage medium |
| PCT/CN2023/106042 WO2024017067A1 (en) | 2022-07-18 | 2023-07-06 | Uplink combined signal anti-overflow method and apparatus, das system and storage medium |
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| CN202210843079.9A CN115296733B (en) | 2022-07-18 | 2022-07-18 | Uplink combined signal anti-overflow method, device, DAS system and storage medium |
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| WO2024017067A1 (en) * | 2022-07-18 | 2024-01-25 | 三维通信股份有限公司 | Uplink combined signal anti-overflow method and apparatus, das system and storage medium |
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