WO2022027996A1 - Lte制式分布式中继系统、上行噪声抑制方法和计算机设备 - Google Patents

Lte制式分布式中继系统、上行噪声抑制方法和计算机设备 Download PDF

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WO2022027996A1
WO2022027996A1 PCT/CN2021/086619 CN2021086619W WO2022027996A1 WO 2022027996 A1 WO2022027996 A1 WO 2022027996A1 CN 2021086619 W CN2021086619 W CN 2021086619W WO 2022027996 A1 WO2022027996 A1 WO 2022027996A1
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uplink signal
signal
unit
uplink
delay
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PCT/CN2021/086619
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English (en)
French (fr)
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曹永福
洪攀峰
杨锋
谢建平
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三维通信股份有限公司
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Priority to BR112022023046A priority Critical patent/BR112022023046A2/pt
Priority to CA3178571A priority patent/CA3178571A1/en
Publication of WO2022027996A1 publication Critical patent/WO2022027996A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a distributed relay system of LTE standard, a method for suppressing uplink noise, and computer equipment.
  • the near-end units (AU and SAU) are oriented to the base station.
  • the channels of multiple cascaded remote units RU will receive the uplink signals of the external terminals, and transmit them to the near-end units through transmission media such as optical fibers and network cables.
  • AU processed and transmitted to the base station.
  • the uplink channel of such a system deteriorates the carrier-to-noise ratio reaching the base station due to the noise superposition of multiple remote units RU, resulting in an increase in the noise floor.
  • An excessively high noise floor will reduce the receiving sensitivity of the base station, and make the uplink and downlink signals in the coverage area seriously unbalanced, resulting in dropped calls during the communication process. Therefore, it is necessary to suppress the uplink noise.
  • the usual noise suppression method divides the uplink signal into multiple resource blocks, then controls the output of the corresponding resource block signal according to the comparison result between the energy of the digital signal of each resource block and the preset threshold, and then reconstructs the output signal of each resource block.
  • the obtained uplink signal is uploaded to the base station to suppress uplink noise.
  • this method does the division of resource blocks, the power statistics of resource blocks, and the restoration of the resource blocks after noise removal to the carrier signal of the base station, time processing is required at each stage. Due to the processing delay, it cannot be tolerated by the radio frequency repeater.
  • the signal transmission is completed within the delay time period (within 10-20 microseconds), so the above noise suppression method cannot be applied to the LTE distributed relay system of radio frequency access.
  • the present application provides an LTE distributed relay system, an uplink noise suppression method and computer equipment, so as to at least solve the problem that the noise suppression method in the related art cannot be applied to an LTE distributed relay system of radio frequency access due to signal processing delay problem in .
  • an embodiment of the present application provides an LTE-standard distributed relay system.
  • the LTE-standard distributed relay system includes an uplink signal detection unit and an uplink signal transmission unit, and the uplink signal detection unit includes a detection terminal and an uplink signal transmission unit.
  • the control terminal, the uplink signal transmission unit includes an input terminal and an output terminal; wherein:
  • the detection end of the uplink signal detection unit and the input end of the uplink signal transmission unit are both connected to the uplink signal receiving end of the LTE standard distributed relay system;
  • the output end of the uplink signal transmission unit is connected to the base station through the signal attenuation unit, and the control end of the uplink signal detection unit is connected to the signal attenuation unit, for the situation that the target uplink signal is detected in the uplink signal detection unit next, trigger the signal attenuation unit to be turned on;
  • the signal attenuating unit is used for restoring attenuation after a delay of a preset time after being turned on.
  • the signal attenuation unit includes a switch unit.
  • the value range of the preset time includes: 300ms to 6000ms.
  • the uplink signal transmission unit further includes: a delay device, the delay device is connected between the input end of the uplink signal transmission unit and the signal attenuation.
  • the delay range of the delay device includes: 5us to 10us.
  • an embodiment of the present application provides a method for suppressing uplink noise, the method comprising:
  • the trigger signal attenuation unit When it is detected that the target uplink signal exists in the uplink signal received by the LTE distributed relay system, the trigger signal attenuation unit is turned on, so that the received uplink signal is transmitted to the base station within a preset time.
  • the signal attenuating unit is configured to turn on the uplink signal transmission path or transmit the uplink signal after attenuating, and the signal attenuating unit delays the preset time to restore attenuation after being triggered to be turned on.
  • the uplink signal is a broadband signal
  • a delay device is further connected in the transmission path of the uplink signal before the signal attenuation unit, and the method further includes: configuring the delay The delay range of the timer, wherein the delay range includes: 5us to 10us.
  • the delay of the delay device is not less than the processing delay of detecting whether there is a target uplink signal in the uplink signal received by the LTE-standard distributed relay system.
  • an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, when the processor executes the computer program
  • the method for suppressing uplink noise as described in the first aspect above is implemented.
  • an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the uplink noise suppression method described in the first aspect above.
  • the LTE-mode distributed relay system includes an uplink signal detection unit and an uplink signal transmission unit, and the The uplink signal detection unit includes a detection terminal and a control terminal, and the uplink signal transmission unit includes an input terminal and an output terminal; wherein: the detection terminal of the uplink signal detection unit and the input terminal of the uplink signal transmission unit are both connected with the LTE
  • the uplink signal receiving end of the standard distributed relay system is connected; the output end of the uplink signal transmission unit is connected to the base station through the signal attenuation unit, and the control end of the uplink signal detection unit is connected to the signal attenuation unit for use in the
  • the uplink signal detection unit detects the target uplink signal
  • the signal attenuation unit is triggered to be turned on; the signal attenuation unit is used to restore attenuation after a delay of a preset time after being turned on, which solves the
  • FIG. 1 is a schematic structural diagram of a DAS system provided by an embodiment
  • FIG. 2 is a schematic block diagram of a remote unit in a DAS system provided by an embodiment
  • FIG. 3 is a structural block diagram of a distributed relay system in an LTE standard provided by an embodiment
  • FIG. 5 is a flowchart of judging whether an uplink signal includes an uplink signal sent by a remote unit according to an embodiment
  • FIG. 6 is an internal structure diagram of a computer device in an embodiment.
  • Words like "connected,” “connected,” “coupled,” and the like referred to in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
  • the “plurality” referred to in this application refers to two or more.
  • “And/or” describes the association relationship between associated objects, indicating that there can be three kinds of relationships. For example, “A and/or B” can mean that A exists alone, A and B exist at the same time, and B exists alone.
  • the character “/” generally indicates that the associated objects are an “or” relationship.
  • the terms “first”, “second”, “third”, etc. involved in this application are only to distinguish similar objects, and do not represent a specific order for the objects.
  • FIG. 1 is a schematic structural diagram of a DAS system according to an embodiment of the present application.
  • the DAS system includes a main near-end unit AU, the uplink can support multiple channel signals (omitted and not shown here), the main near-end unit AU Under the end unit AU, the remote unit RU and the expansion unit EU are cascaded through the optical fiber.
  • the expansion unit EU is cascaded with the remote units RU2, RU3, ..., RUn, and the number of cascaded remote units is set according to actual needs.
  • each RU has multiple RF channels.
  • the radio frequency channel of the remote unit RU is mapped to a certain channel of the main near-end unit AU through the carrier mapping function.
  • the remote unit receives the uplink signal of the mobile device, the first combination and addition is completed in the extension unit EU.
  • the EU transmits the data stream of the signal to the main near-end unit AU through the optical fiber.
  • the second combining and summing is completed, and then the combined signal is sent to the main near-end unit AU for one channel before sending. to the base station for processing.
  • FIG. 2 shows the principle block diagram of the remote unit in the DAS system.
  • the radio frequency transceiver module of the remote unit receives the uplink radio frequency signal from the user end through the integrated antenna through the duplexer, and the integrated radio frequency transceiver converts the radio frequency signal to digital through low noise amplifier, frequency conversion processing and AD conversion.
  • the signal is then transmitted to the digital baseband processing module and the noise floor suppression module.
  • the digital baseband processing module performs synchronization, automatic gain control, digital filtering and other processing on the digital signal.
  • the uplink noise suppression method and the LTE distributed relay system proposed in this embodiment are embodied in the noise floor suppression method.
  • the signal is processed by the noise floor suppression module and then packaged into serial data according to a certain frame format and sent to the digital interface module; the digital interface module converts the corresponding digital signal according to the different transmission media used, such as optical fiber and cable. Converted to optical signal or Ethernet signal and sent to the near-end unit.
  • the downlink workflow is the inverse of the uplink workflow.
  • the remote unit RU receives an uplink radio frequency signal from a user terminal, and the user terminal may include a mobile phone, a tablet computer, a notebook computer, a PDA, a Mobile Internet Device (MID), a wearable device (such as a smart watch, smart bracelet, pedometer, etc.) or other communication modules.
  • the LTE-standard distributed relay system includes an uplink signal detection unit 310 and an uplink signal transmission unit 320, and the uplink signal detection unit 310 includes a detection terminal and a control terminal , the uplink signal transmission unit 320 includes an input end and an output end; wherein:
  • the detection terminal of the uplink signal detection unit 310 and the input terminal of the uplink signal transmission unit 320 are both connected to the uplink signal receiving terminal of the LTE standard distributed relay system;
  • the output end of the uplink signal transmission unit 320 is connected to the base station through the signal attenuation unit 321, and the control end of the uplink signal detection unit 310 is connected to the signal attenuation unit 321, and is used to trigger a trigger when the uplink signal detection unit 310 detects the target uplink signal.
  • the signal attenuation unit 321 is turned on;
  • the signal attenuating unit 321 is used to restore the attenuation with a delay of a preset time after being turned on.
  • the upstream signal is an unmodulated or modulated digital signal, and the frequency spectrum occupied by it starts from zero frequency or a lower frequency.
  • the upstream signal is an electrical waveform representation of digital information, which can use different levels or pulses or related modulation to represent the corresponding message code.
  • the uplink signal may include the target uplink signal and the noise signal. Therefore, after receiving the uplink signal, it is necessary to determine whether the uplink signal contains the target uplink signal through the signal detection unit 310.
  • the target uplink signal refers to It is a signal sent by the user terminal, that is, a useful signal, such as a mobile phone signal. If the signal detection unit 310 detects the target uplink signal, the signal attenuation unit 321 is triggered to be turned on; the signal attenuation unit 321 resumes attenuating with a delay of a preset time after being turned on.
  • the user terminal continuously sends multiple uplink signals.
  • the uplink signal detection unit 310 detects whether the uplink signal includes the target uplink signal, and the detection duration can be determined according to the actual situation.
  • the resource block signal continues to occupy for 0.5ms.
  • To detect the power of the resource block is to extract the signal of this resource block in real time, and then accumulate the power during this time and compare it with the noise reference value.
  • the comparison process is very fast, such as 0.1us
  • the extraction includes frequency selection filtering, that is, the resource block is separated from the baseband signal, which takes about 3us to 8us, so the total detection time needs 503us to 508us or slightly larger.
  • the trigger signal attenuation unit 321 is turned on and prolongs the turn-on preset time to ensure that the next uplink signal sent by the user terminal can be sent to the base station in time.
  • the preset time is the turn-on delay time of the signal attenuation unit 321, and the turn-on delay time can be set to be greater than or equal to the interval time for the user terminal to continuously send multiple uplink signals, so that the target uplink signal can be used It is transmitted to the base station in time within the delay to avoid missing the sending time of the uplink signal due to the detection delay.
  • the value range of the preset time includes: 300ms to 6000ms.
  • the built-in delay module starts timing, and when the target uplink signal of the uplink channel transmission has not been detected after a preset time, that is, If the power of no resource block is greater than the preset threshold, it is considered that the target uplink signal is no longer available, and the signal attenuation unit 321 is turned off to cut off the noise, so as to eliminate the noise in the period when there is no uplink signal of the online user.
  • the delay module will re-time to ensure that the user will not exit the memory when the remote unit is online and the user does not transmit the signal temporarily.
  • the signal of the resource block cannot be transmitted to the near-end AU within the transmission time of the resource block.
  • the main reason is that the transmission time of the resource block may have passed when the power of the detected resource block meets the transmission conditions. Therefore, the existing method is only theoretically feasible by reconstructing the resource block.
  • the RF repeater can use The delay is only 10 ⁇ 20us, the specific delay can refer to the repeater standard.
  • the occupancy time of a resource block is 0.5ms. It takes 0.5ms to receive the entire resource block, and then judge whether there is a user signal or not. It should be noted that multiple resource blocks arriving at the same time at different frequencies can deal with.
  • the reconstruction process of multiple resource blocks cannot be completed within 20us. Therefore, the traditional noise suppression method cannot be used in the LTE distributed relay system of radio frequency access due to the problem of signal detection delay.
  • the LTE distributed relay system adopts a trigger mode to control the transmission of uplink signals, and solves the signal processing delay by setting the signal attenuation unit 321 to be delayed and turned off, that is, bypassing filtering and power detection. and determine the processing time required.
  • the signal attenuation unit is triggered to be turned on after the target uplink signal is detected, and the attenuation is resumed after a preset time delay after being turned on, so as to ensure that the next target uplink signal can be transmitted to the base station within the signal transmission time, and When there is a target uplink signal, the delay is continued, so that the problem that the existing noise suppression process cannot be applied to the LTE distributed relay system of radio frequency access due to the signal processing delay can be solved.
  • the signal attenuating unit 321 may include a trigger-type delay device, which is always delayed and turned on as long as it is triggered.
  • the initial state of the uplink channel is the disconnected state
  • the first transmission signal of the user end will be blocked.
  • the first connection initiated by the user terminal is the PRACH signal, and the system stipulates that the mobile phone can test multiple times (PRACH), so it does not affect the normal operation of the system.
  • the attenuation processing can be settable. For example, it can be set to reduce the uplink signal by 3 binary bits, corresponding to 18dB, so that the high-power signal can be transmitted to the base station attenuated, reducing the complete blocking chance of signal transmission and improving the signal transmission efficiency. Fluency.
  • the signal attenuation unit includes a switch unit.
  • the switch unit includes an off state and an on state.
  • the switch unit When the trigger signal attenuation unit is turned on, the switch unit is closed, the uplink channel between the remote unit and the base station is in the conduction state, and the signal uplink signal is transmitted to the base station in full carrier.
  • the signal attenuation unit 321 is not triggered to be turned on, that is, the switch unit is in an off state, the transmission of the uplink signal to the base station is completely suppressed.
  • the uplink signal transmission unit 320 further includes: a delay unit 322 connected between the input end of the uplink signal transmission unit 320 and the signal attenuation unit 321 .
  • the uplink signal receiving end of the LTE distributed relay system After the uplink signal receiving end of the LTE distributed relay system receives the uplink signal sent by the user end, it is sent to the uplink signal detection unit and the uplink signal transmission unit respectively, and the uplink signal detection unit performs the target uplink signal on the received uplink signal.
  • the delay device in the uplink signal transmission unit acquires and buffers the uplink signal, the buffering time is the delay time of the delay device, and the buffered signal is transmitted to the base station when the signal attenuation unit is turned on.
  • the detection in this embodiment is different from the previous power detection for resource blocks, but corresponds to the instantaneous power in all frequency bands corresponding to the frequency width after the baseband is equally divided into a larger bandwidth (such as 1.08MHz). detection.
  • the prerequisite for this is that the corresponding uplink user signal is required to be large enough (high), because the detection threshold requires the exclusion of noise power (Note: the noise power has a peak-to-average ratio, and this peak-to-average ratio must be added to prevent it from being affected by noise. triggered).
  • the PRACH channel can be calculated by adding together the 6 resource blocks occupied by it, and the corresponding occupied bandwidth is 1.08MHz.
  • the delay range of the delay device includes: 5us to 10us.
  • This delay device is used to cancel the time delay caused by the above power detection (including the delay of the filtering process).
  • the baseband signal of the user signal is sent to the base station without any leakage, and the user signal in this part of the period will not be lost due to the detection of the line response delay time, thereby ensuring the integrity of the corresponding baseband signal detected above.
  • FIG. 4 is a flowchart of a method for suppressing uplink noise provided by an embodiment. As shown in FIG. 3 , the method for suppressing uplink noise includes step 410 and step 420, wherein:
  • Step 410 Detect whether there is a target uplink signal in the uplink signal received by the LTE-standard distributed relay system.
  • Step 420 In the case where it is detected that the target uplink signal exists in the uplink signal received by the LTE-mode distributed relay system, trigger the signal attenuation unit to turn on, so that the received uplink signal is blocked within a preset time. transmission to the base station, wherein the signal attenuating unit is used to turn on the uplink signal transmission path or attenuate the uplink signal for transmission, and the signal attenuating unit delays the preset time to restore attenuation after being triggered to turn on .
  • the preset time is the turn-on delay time of the signal attenuation unit 321, and the turn-on delay time can be set to be greater than or equal to the interval time for the user terminal to continuously send multiple uplink signals, so that the target uplink signal can be used It is transmitted to the base station in time within the delay to avoid missing the sending time of the uplink signal due to the detection delay.
  • the value range of the preset time includes: 300ms to 6000ms.
  • the built-in delay module starts timing, and when the target uplink signal of the uplink channel transmission has not been detected after the preset time, that is, the power of no resource block is greater than the predetermined time. If the threshold is set, it is considered that the target uplink signal is gone again, and the noise is blocked by disconnecting the signal attenuation unit 321, so as to eliminate the noise in the period of no online user signal. Once the target uplink signal is detected, the delay module will re-time to ensure that the user will not exit the memory when the remote unit is online when the user does not transmit the signal temporarily.
  • the uplink noise suppression method provided by this embodiment adopts the trigger mode to control the transmission of the uplink signal, and solves the signal processing delay by setting the signal attenuation unit to be delayed and closed, that is, bypassing the filtering, power detection and judgment needs. processing time.
  • the signal attenuation unit is triggered to be turned on after the target uplink signal is detected, and the attenuation is resumed after a preset time delay after being turned on, so as to ensure that the next target uplink signal can be transmitted to the base station within the signal transmission time, so that the It solves the problem that the noise suppression method in the related art cannot be applied to the LTE standard distributed relay system of radio frequency access due to the signal processing time delay.
  • the attenuation processing can be settable. For example, it can be set to reduce the uplink signal by 3 bits, corresponding to 18dB, so that the high-power signal can be transmitted to the base station with attenuation, reducing the chance of signal transmission being blocked and improving the smoothness of signal transmission.
  • the signal attenuation unit when the signal attenuation unit is not triggered, at least a part of the uplink signal is transmitted to the base station after the uplink signal is attenuated, so that the uplink signal can also reach the base station for communication when the uplink signal is strong enough. Both the signal and the noise are attenuated.
  • the uplink signal is a broadband signal
  • a delay device is further connected in the transmission path of the uplink signal before the signal attenuation unit, and the method further includes: configuring the delay The delay range of the timer.
  • the uplink signal receiving end of the LTE distributed relay system After the uplink signal receiving end of the LTE distributed relay system receives the uplink signal sent by the user end, it is sent to the uplink signal detection unit and the uplink signal transmission unit respectively, and the uplink signal detection unit performs the target uplink signal on the received uplink signal.
  • the delay device in the uplink signal transmission unit acquires and buffers the uplink signal, the buffering time is the delay time of the delay device, and the buffered signal is transmitted to the base station when the signal attenuation unit is turned on.
  • the detection in this embodiment is different from the previous power detection for resource blocks, but corresponds to the instantaneous power in all frequency bands corresponding to the frequency width after the baseband is equally divided into a larger bandwidth (such as 1.08MHz). detection.
  • the prerequisite for this is that the corresponding uplink user signal is required to be large enough (high), because the detection threshold requires the exclusion of noise power (Note: the noise power has a peak-to-average ratio, and this peak-to-average ratio must be added to prevent it from being affected by noise. Triggered), for the PRACH channel, the 6 resource blocks occupied by it can be used to calculate together, and the corresponding occupied bandwidth is 1.08MHz.
  • the delay of the delay device is not less than the processing delay of detecting whether there is a target uplink signal in the uplink signal received by the LTE-standard distributed relay system.
  • the delay range of the delay device includes: 5us to 10us.
  • This delay device is used to cancel the time delay caused by the above power detection (including the delay of the filtering process).
  • the baseband signal of the user signal is sent to the base station without any leakage, and the user signal in this part of the period will not be lost due to the detection of the line response delay time, thereby ensuring the integrity of the corresponding baseband signal detected above.
  • the detecting whether there is a target uplink signal in the uplink signal received by the LTE-standard distributed relay system includes steps 510 to 550, wherein:
  • Step 510 Obtain the signal transmission channel type of the uplink signal and the modulation rule corresponding to the channel type.
  • Step 520 Acquire resource occupied information of the uplink signal according to the signal transmission channel type and the channel type modulation rule.
  • Step 530 Perform filtering processing on the occupied resource information through a segmented filter bank to obtain a digital signal of a preset bandwidth filter corresponding to the occupied resource information.
  • Step 540 Calculate the power of the digital signals of the plurality of preset bandwidth filters and compare them with a preset threshold.
  • Step 550 Determine whether the target uplink signal is included in the uplink signal according to the comparison result.
  • the signal transmission channel type of the uplink signal and the modulation rule corresponding to the channel type will affect the occupied resources of the uplink signal. Therefore, to determine whether the uplink signal contains the target uplink signal, it can be determined according to the respective channel modulation (time-frequency) rules and synchronization. Based on the channel dynamic allocation time-frequency rule of the base station, the power of the corresponding channel (time-frequency) for detection is changed, thereby improving the judgment accuracy.
  • the occupied resource information includes the power information of the signal.
  • mobile phone signals are transmitted in resource blocks, but for PUCCH and SRS signals, they do not occupy the entire resource block, but only a part of the resource block.
  • PUCCH channel and SRS signal since they do not occupy the entire resource block, it is better to use the resources corresponding to the occupied resources of the base station specification, and processing according to the resource block will reduce the judgment sensitivity.
  • the PRACH resource is also related to the system frame sequence number, etc., so it needs to be synchronized according to the system frame sequence number of the base station.
  • the uplink signal is passed through the segmented filter bank to obtain the digital signal of each resource block; then the power of the digital signal of each resource block is calculated respectively, and each resource block is The digital signal power is compared to a preset threshold. If the power of each digital signal is less than a preset threshold, it is determined that the uplink signal does not contain the target uplink signal; if the power of the digital signal in any resource block is greater than the preset threshold, it is determined that the uplink signal contains target uplink signal. That is, as long as the power of one resource block is greater than the preset threshold, it is considered that there are users in the coverage area.
  • the signal attenuation unit when any of the powers is greater than a preset threshold, the signal attenuation unit is triggered by an OR gate output signal.
  • each comparison result to the receiving end corresponding to the OR gate when the power of the digital signal is greater than or equal to the preset threshold, determine that the digital signal of the resource block contains the target uplink signal, and output 1 to the OR gate corresponding to When the power of all resource blocks of the digital signal is less than the preset threshold, it is judged that the digital signals of all resource blocks at this time do not contain the target uplink signal, and outputs 0 to the receiving end corresponding to the OR gate.
  • the output end of the OR gate is connected to the signal attenuation unit.
  • the output end of the OR gate When any receiving end of the OR gate receives a signal of 1, the output end of the OR gate outputs 1 to the signal attenuation unit, and the signal attenuation unit is triggered to conduct, thereby conducting the remote end.
  • the method further includes: acquiring the number of remote units in the DAS system; and setting the preset threshold according to the number of the remote units.
  • users who cover the edge are removed by increasing the preset threshold, thereby increasing the noise canceling ratio and reducing the noise canceling pressure.
  • the method further includes: when there is a relatively high (strong) user signal, by using a corresponding larger bandwidth (eg 1.08MHz) filter and coordinating with instantaneous power detection and then cooperating with a delay ( Baseband signal delay), it can avoid the loss of user signals due to detection delay, especially the problem that users transmit uplink signals for the first time.
  • a relatively high (strong) user signal by using a corresponding larger bandwidth (eg 1.08MHz) filter and coordinating with instantaneous power detection and then cooperating with a delay ( Baseband signal delay), it can avoid the loss of user signals due to detection delay, especially the problem that users transmit uplink signals for the first time.
  • the delay of the filter is relatively small (2us ⁇ 3us ), so that the total processing delay reaches 5us to 10us, so that the delay requirement of the repeater system can be met.
  • the peak-to-average ratio of noise is less than 15dB, so that the noise (signal) can not trigger the threshold by setting the threshold higher than 15dB. Only the real mobile phone signal (target uplink signal will trigger this threshold, so only the real mobile phone uplink signal will be captured. When the uplink has a high enough carrier-to-noise ratio, you can set the corresponding high carrier-to-noise ratio threshold.
  • the calculating the power of the digital signals of the plurality of preset bandwidth filters includes:
  • the uplink signal includes an uplink signal.
  • the preset bandwidth is usually a larger bandwidth, such as 1.08MHz.
  • the detection bandwidth is increased, the time for obtaining the instantaneous power is shortened, and the corresponding filter time delay is also shorter, so that the detection speed can be correspondingly accelerated.
  • the received carrier data can be stored and delayed first, and at the same time, it can be detected whether the uplink signal contains the target uplink signal. If so, the stored delayed data can be transmitted to the base station to avoid blockage or The problem of missing the initial access signal.
  • the detection time is shortened by acquiring the instantaneous power of the digital signal of the preset bandwidth filter at any time position, instead of the aforementioned power for detecting the entire resource block.
  • the processing delay is solved by the signal delay device, that is, the processing time required for compensation filtering, power detection and judgment is compensated, and then the signal attenuation unit is turned on when the instantaneous power detected reaches the preset threshold, so that the detection process can be carried out in real time, regardless of whether the instantaneous power reaches the preset threshold.
  • the signal attenuation unit is triggered to be turned on.
  • the detection method provided in this embodiment is not the same as the above-mentioned way of judging the power of resource blocks.
  • the method in this embodiment does not accurately detect the power of the uplink signal of the user (for example, the resource block power is not taken), but only distinguishes the noise from the uplink signal with the user, and only under the condition of a high uplink carrier-to-noise ratio.
  • it can also be used as a supplement to the resource block power discrimination method to discriminate the first user signal with higher power transmitted by the user and open the channel switch in time, thereby avoiding the problem of blocking the first resource block by the original method.
  • statistics are also performed on the data, and the statistical data may include which resource blocks have user signals and the occupied quantity, etc., so as to record the usage ratio of the remote unit users.
  • FIG. 6 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present application.
  • the computer device may include a processor 61 and a memory 62 storing computer program instructions.
  • the above-mentioned processor 61 may include a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • memory 62 may include mass storage for data or instructions.
  • the memory 62 may include a hard disk drive (Hard Disk Drive, abbreviated as HDD), a floppy disk drive, a solid state drive (referred to as SSD), flash memory, optical disk, magneto-optical disk, magnetic tape, or universal serial A Universal Serial Bus (USB for short) drive or a combination of two or more of these.
  • Memory 62 may include removable or non-removable (or fixed) media, where appropriate. Where appropriate, memory 62 may be internal or external to the data processing device.
  • the memory 62 is a non-volatile (Non-Volatile) memory.
  • the memory 62 includes a read-only memory (Read-Only Memory, referred to as ROM for short) and a random access memory (Random Access Memory, referred to as RAM for short).
  • the ROM can be a mask-programmed ROM, a programmable ROM (Programmable Read-Only Memory, referred to as PROM), an erasable PROM (Erasable Programmable Read-Only Memory, referred to as EPROM), an electrically programmable Erasing PROM (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), Electrically Rewritable ROM (Electrically Alterable Read-Only Memory, referred to as EAROM) or Flash (FLASH) or a combination of two or more of these.
  • the RAM may be Static Random-Access Memory (SRAM for short) or Dynamic Random Access Memory (DRAM for short), where DRAM may be a fast page Mode dynamic random access memory (Fast Page Mode Dynamic Random Access Memory, referred to as FPMDRAM), extended data output dynamic random access memory (Extended Date Out Dynamic Random Access Memory, referred to as EDODRAM), synchronous dynamic random access memory (Synchronous Dynamic Random-Access Memory, referred to as SDRAM) and so on.
  • SRAM Static Random-Access Memory
  • DRAM Dynamic Random Access Memory
  • SDRAM synchronous dynamic random access memory
  • the memory 62 may be used to store or cache various data files required for processing and/or communication use, as well as possibly computer program instructions executed by the processor 62 .
  • the processor 61 reads and executes the computer program instructions stored in the memory 62 to implement any one of the uplink noise suppression methods in the foregoing embodiments.
  • the computer device may also include a communication interface 63 and a bus 60 .
  • the processor 61 the memory 62 , and the communication interface 63 are connected through the bus 60 to complete the mutual communication.
  • the communication interface 63 is used to implement communication between modules, apparatuses, units, and/or devices in the embodiments of the present application.
  • the communication port 63 can also implement data communication with other components such as: external devices, image/data acquisition devices, databases, external storage, and image/data processing workstations.
  • the bus 60 includes hardware, software, or both, coupling the components of the computer device to each other.
  • the bus 60 includes but is not limited to at least one of the following: a data bus (Data Bus), an address bus (Address Bus), a control bus (Control Bus), an expansion bus (Expansion Bus), and a local bus (Local Bus).
  • the bus 60 may include an Accelerated Graphics Port (AGP) or other graphics buses, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (Front Side Bus) , referred to as FSB), Hyper Transport (Hyper Transport, referred to as HT) interconnect, Industry Standard Architecture (Industry Standard Architecture, referred to as ISA) bus, wireless bandwidth (InfiniBand) interconnect, Low Pin Count (Low Pin Count, referred to as LPC bus, memory bus, Micro Channel Architecture (MCA) bus, Peripheral Component Interconnect (PCI) bus, PCI-Express (PCI-X) bus, serial Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local Bus (VLB) bus or other suitable bus or a combination of two or more of these.
  • Bus 60 may include one or more buses, where appropriate. Although embodiments herein describe and illustrate a particular bus, this application contemplates any suitable bus or interconnect.
  • the computer device may execute the uplink noise suppression method in the embodiment of the present application based on the acquired program instructions, thereby implementing the uplink noise suppression method described in conjunction with FIG. 3 .
  • the embodiments of the present application may provide a computer-readable storage medium for implementation.
  • Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by the processor, any one of the uplink noise suppression methods in the foregoing embodiments is implemented.

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Abstract

一种LTE制式分布式中继系统和上行噪声抑制方法，包括上行信号检测单元和上行信号传输单元，上行信号检测单元的检测端和上行信号传输单元的输入端均与LTE制式分布式中继系统的上行信号接收端连接；上行信号传输单元的输出端通过信号衰减单元与基站连接，上行信号检测单元的控制端与信号衰减单元连接，用于在上行信号检测单元检测到目标上行信号的情况下，触发信号衰减单元导通；信号衰减单元用于在导通后延迟预设时间恢复衰减。

Description

LTE制式分布式中继系统、上行噪声抑制方法和计算机设备
相关申请
本申请要求2020年8月4日申请的，申请号为202010771575.9，发明名称为“LTE制式分布式中继系统、上行噪声抑制方法和计算机设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别是涉及LTE制式分布式中继系统、上行噪声抑制方法和计算机设备。
背景技术
随着移动通信的发展，信号的频率频段越来越高，天线通道数也越来越多，原来低频段采用的无源分布式系统已经不太适应，正被分布式天线系统或微分布式基站所替代。分布式天线系统是目前解决室内无线通信覆盖以及大型室外场所无线覆盖的主要方案，分布式天线系统(Distributed Antenna System，DAS)由主近端单元(Administration Unit，AU)、从近端单元(Subordinate Administration Unit，SAU)、扩展单元(Extended Unit，EU)和远端单元(Remote Unit，RU)组成。近端单元(AU和SAU)是面向基站端的，在上行链路中，多台级联的远端单元RU的通道会接收外部终端的上行信号，通过光纤、网线等传输介质传输到近端单元AU，经过处理后传输至基站。此类系统的上行通道由于多个远端单元RU的噪声叠加恶化了到达基站的载噪比，造成底噪抬升。过高的底噪会降低基站接收灵敏度，并使得覆盖区域内上下行信号严重不平衡，通信过程中出现掉话等问题，因此需要对上行噪声进行抑制处理。
通常的噪声抑制方法通过将上行信号分割为多个资源块，然后根据各资源块数字信号的能量与预设门限的比较结果控制相应资源块信号输出，再将各资源块输出信号进行重构后得到的上行信号上传至基站，以抑制上行噪声。但是由于该方法做资源块的分割、资源块的功率统计及清除噪声后的资源块还原到基站载波信号，各个阶段都需要时间处理，由于处理时延，从而无法在射频直放站容忍的时延时间段内(10～20微秒以内)完成信号传输，因此上述噪声抑制方法无法应用在射频接入的LTE制式分布式中继系统中。
发明内容
本申请提供一种LTE制式分布式中继系统、上行噪声抑制方法和计算机设备，以至少解决相关技术中的噪声抑制方法由于信号处理时延无法应用在射频接入的LTE制式分布式中继系统中的问题。
第一方面，本申请实施例提供了一种LTE制式分布式中继系统，所述LTE制式分布式中继系统包括上行信号检测单元和上行信号传输单元，所述上行信号检测单元包括检测端和控制端，所述上行信号传输单元包括输入端和输出端；其中：
所述上行信号检测单元的检测端和所述上行信号传输单元的输入端均与所述LTE制式分布式中继系统的上行信号接收端连接；
所述上行信号传输单元的输出端通过信号衰减单元与基站连接，所述上行信号检测单元的控制端与所述信号衰减单元连接，用于在所述上行信号检测单元检测到目标上行信号的情况下，触发所述信号衰减单元导通；
所述信号衰减单元用于在导通后延迟预设时间恢复衰减。
在其中一些实施例中，所述信号衰减单元包括开关单元。
在其中一些实施例中，所述预设时间的取值范围包括：300ms至6000ms。
在其中一些实施例中，所述上行信号传输单元还包括：延时器，所述延时器连接于所述上行信号传输单元的输入端和所述信号衰减之间。
在其中一些实施例中，所述延时器的延时范围包括：5us至10us。
第二方面，本申请实施例提供了一种上行噪声抑制方法，所述方法包括：
检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号；
在检测到所述LTE制式分布式中继系统接收到上行信号中存在所述目标上行信号的情况下，触发信号衰减单元导通，以使得接收到的上行信号在预设时间内被传输给基站，其中，所述信号衰减单元用于导通上行信号传输通路或者对所述上行信号进行衰减后传输，且所述信号衰减单元在被触发导通后延迟所述预设时间恢复衰减。
在其中一些实施例中，所述上行信号为宽带信号，所述上行信号传输通路中处于所述信号衰减单元之前的传输通路中还连接有延时器，所述方法还包括：配置所述延时器的延时范围，其中，所述延时范围包括：5us至10us。
在其中一些实施例中，所述延时器的延时不小于检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号的处理时延。
第三方面，本申请实施例提供了一种计算机设备，包括存储器、处理器以及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述计算机程序时实 现如上述第一方面所述的上行噪声抑制方法。
第四方面，本申请实施例提供了一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现如上述第一方面所述的上行噪声抑制方法。
相比于相关技术，本申请实施例提供的LTE制式分布式中继系统、上行噪声抑制方法和计算机设备，所述LTE制式分布式中继系统包括上行信号检测单元和上行信号传输单元，所述上行信号检测单元包括检测端和控制端，所述上行信号传输单元包括输入端和输出端；其中：所述上行信号检测单元的检测端和所述上行信号传输单元的输入端均与所述LTE制式分布式中继系统的上行信号接收端连接；所述上行信号传输单元的输出端通过信号衰减单元与基站连接，所述上行信号检测单元的控制端与所述信号衰减单元连接，用于在所述上行信号检测单元检测到目标上行信号的情况下，触发所述信号衰减单元导通；所述信号衰减单元用于在导通后延迟预设时间恢复衰减，解决了相关技术中的噪声抑制过程由于信号处理时延无法应用在射频接入的LTE制式分布式中继系统中的问题。
本申请的一个或多个实施例的细节在以下附图和描述中提出，以使本申请的其他特征、目的和优点更加简明易懂。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1为一实施例提供的DAS系统的结构示意图；
图2为一实施例提供的DAS系统中远端单元的原理框图；
图3为一实施例提供的LTE制式分布式中继系统的结构框图；
图4为一实施例提供的上行噪声抑制方法的流程图；
图5为一实施例提供的判断上行信号中是否包含远端单元发送的上行信号的流程图；
图6为一实施例中计算机设备的内部结构图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行描述和说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。基于本申请提供的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施例，都属于本申请保护的范围。
显而易见地，下面描述中的附图仅仅是本申请的一些示例或实施例，对于本领域的普 通技术人员而言，在不付出创造性劳动的前提下，还可以根据这些附图将本申请应用于其他类似情景。此外，还可以理解的是，虽然这种开发过程中所作出的努力可能是复杂并且冗长的，然而对于与本申请公开的内容相关的本领域的普通技术人员而言，在本申请揭露的技术内容的基础上进行的一些设计，制造或者生产等变更只是常规的技术手段，不应当理解为本申请公开的内容不充分。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域普通技术人员显式地和隐式地理解的是，本申请所描述的实施例在不冲突的情况下，可以与其它实施例相结合。
除非另作定义，本申请所涉及的技术术语或者科学术语应当为本申请所属技术领域内具有一般技能的人士所理解的通常意义。本申请所涉及的“一”、“一个”、“一种”、“该”等类似词语并不表示数量限制，可表示单数或复数。本申请所涉及的术语“包括”、“包含”、“具有”以及它们任何变形，意图在于覆盖不排他的包含；例如包含了一系列步骤或模块(单元)的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可以还包括没有列出的步骤或单元，或可以还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。本申请所涉及的“连接”、“相连”、“耦接”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电气的连接，不管是直接的还是间接的。本申请所涉及的“多个”是指两个或两个以上。“和/或”描述关联对象的关联关系，表示可以存在三种关系，例如，“A和/或B”可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。本申请所涉及的术语“第一”、“第二”、“第三”等仅仅是区别类似的对象，不代表针对对象的特定排序。
本申请描述的各种技术可应用于分布式天线系统(Distributed Antenna System，DAS)中。图1是根据本申请实施例的DAS系统的结构示意图，如图1所示，DAS系统包括一个主近端单元AU，上行链路可以支持多个通道信号(此处省略未画)，主近端单元AU下通过光纤级联远端单元RU和扩展单元EU，扩展单元EU下级联远端单元RU2、RU3、......、RUn，远端单元的级联数量根据实际需要设置，每个RU有多个射频通道。远端单元RU的射频通道通过载波映射功能被映射到主近端单元AU的某一个通道上，远端单元接收移动设备的上行信号后，在扩展单元EU中完成第一次合路相加，EU通过光纤向主近端单元AU传送信号的数据流，在主近端单元AU中，完成第二次合路相加，然后将该合路信号发送到主近端单元AU一个通道后再发送到基站进行处理。
图2给出了DAS系统中远端单元的原理框图。在上行链路中，远端单元的射频收发 模块通过双工器由一体化天线接收来自用户端的上行射频信号，经一体化射频收发器将射频信号经低噪声放大器、变频处理和AD转换为数字信号后传递给数字基带处理模块及底噪抑制模块。在数字基带处理模块中对数字信号进行同步、自动增益控制、数字滤波等处理，如图2所示，本实施方式提出的上行噪声抑制方法和LTE制式分布式中继系统就体现在底噪声抑制模块中，信号经过底噪声抑制模块处理后再按一定帧格式打包成串行数据，发送给数字接口模块；数字接口模块中根据采用的传输介质的不同，如光纤、电缆，将相应的数字信号转化为光信号或以太网信号发送给近端单元。下行链路工作流程是上行链路工作流程的逆过程。本申请中，远端单元RU接收来自用户端的上行射频信号，用户端可以包括手机、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(Mobile Internet Device，MID)、可穿戴设备(例如智能手表、智能手环、计步器等)或其他通信模块。
图3为一实施例提供的LTE制式分布式中继系统的结构框图，LTE制式分布式中继系统包括上行信号检测单元310和上行信号传输单元320，上行信号检测单元310包括检测端和控制端，上行信号传输单元320包括输入端和输出端；其中：
上行信号检测单元310的检测端和上行信号传输单元320的输入端均与LTE制式分布式中继系统的上行信号接收端连接；
上行信号传输单元320的输出端通过信号衰减单元321与基站连接，上行信号检测单元310的控制端与信号衰减单元321连接，用于在上行信号检测单元310检测到目标上行信号的情况下，触发信号衰减单元321导通；
信号衰减单元321用于在导通后延迟预设时间恢复衰减。
在数字通信系统中，上行信号为未经调制或已调制的数字信号，其所占据的频谱从零频或较低频率开始。上行信号是数字信息的电波形表示，它可以用不同的电平或脉冲或相关调制来表示相应的消息代码。在信号传输过程中，上行信号中可能包含目标上行信号和噪声信号，因此在接收到上行信号后需要通过信号检测单元310判断上行信号中是否包含目标上行信号，本申请中，目标上行信号指的是用户端发送的信号，即有用信号，例如手机信号。若信号检测单元310检测到目标上行信号，则触发信号衰减单元321导通；信号衰减单元321在导通后延迟预设时间恢复衰减。
具体地，用户端持续发送多个上行信号，当远端单元接收到第一个上行信号后，上行信号检测单元310检测上行信号中是否包含目标上行信号，检测时长可以根据实际情况确定。在实际应用中，资源块信号持续占用时长为0.5ms，检测资源块功率就是把这个资源块的信号实时提取，然后累计这个时间内的功率再与噪声参考值进行比较。其中，比较过程很快，如0.1us，提取包括选频滤波，就是把资源块从基带信号中分离出来，大约要3us～8us， 因此总检测时间需要503us～508us或稍大一点。若检测到第一个上行信号中包含目标上行信号，则触发信号衰减单元321导通并延长导通预设时间以保证用户端发送的下一个上行信号可以及时发送至基站。
本申请中，预设时间即为信号衰减单元321的导通延迟时间，导通延迟时间可以设置为大于或等于用户端持续发送多个上行信号的间隔时间，以使目标上行信号可以在可利用时延内及时传输至基站，避免由于检测时延错过上行信号的发送时间。在其中一些实施例中，所述预设时间的取值范围包括：300ms至6000ms。
参考图3，在信号衰减单元321为导通状态时且在最后一个上行信号传输完成后，内置的延时模块开始计时，当在预设时间后仍未检测到上行通道传输目标上行信号，即没有任何一个资源块的功率大于预设门限，则认为目标上行信号又没有了，通过断开信号衰减单元321使得噪声被卡断，以消除无在线用户上行信号时段的噪声。一旦检测到目标上行信号则延时模块重新计时，以保证远端单元在线时用户上行暂不发射信号时不会退出记忆。
传统地，在初来上行信号时，无法在资源块的传送时刻内让该资源块的信号传送到近端AU。其主要原因是在检测资源块的功率符合传输条件完成时，可能已经过了该资源块的发送时间，因此现有的方法通过重建资源块只是理论上可行，实际上，射频直放站可利用的时延只有10～20us，具体时延可参照直放站标准。而LTE一个资源块的占有时间是0.5ms，等到接收整个资源块时需要花费0.5ms，之后再做有无用户信号的判断，需要说明的是，不同频率同时到达的多个资源块可进行同时处理。再加上多个资源块的重构过程，20us时间内是不可能完成的，因此传统噪声抑制方法由于信号检测时延问题是无法使用在射频接入的LTE制式分布式中继系统中的。
与现有技术相比，本实施例提供的LTE制式分布式中继系统采用触发模式控制上行信号的传输，通过设置信号衰减单元321延时关闭来解决信号处理延迟，即绕过滤波、功率检测及判断所需要的处理时间。具体地，在检测到目标上行信号后触发信号衰减单元导通，并在导通后要延迟预设时间后恢复衰减，从而保证下一个目标上行信号可以在信号传送时间内传输至基站，并且在有目标上行信号时就持续延时，从而可以解决现有噪声抑制过程由于信号处理时延无法应用在射频接入的LTE制式分布式中继系统中的问题。信号衰减单元321中可以包括触发式延时器，一直触发就一直延迟导通。
需要说明的是，由于上行通道初始状态为断开状态，因此用户端第一个发射信号会被堵。但是在实际系统运行中，用户端发起连接的第一个是PRACH信号，系统规定手机可以试探多次(PRACH)，所以并不影响系统的正常工作。
对于触发模式，当信号衰减单元321为导通状态时，远端单元与基站之间的上行通道 为导通状态，上行信号可以直接将原基带信号传输至基站。当未触发信号衰减单元321导通时，衰减程度可以完全衰减或部分衰减。完全衰减可以理解为完全抑制上行信号传输至基站，部分衰减可以理解为对上行信号进行衰减处理后传输至基站。衰减处理可以为可设置型，如可以设置成将上行信号缩小3位二进制，对应18dB，从而可以让大功率信号有衰减地传输至基站，减少信号传输的完全的被堵机会，提高信号传输的流畅性。
在其中一些实施例中，所述信号衰减单元包括开关单元。
开关单元包括断开状态和导通状态。当触发信号衰减单元导通时，即闭合开关单元，远端单元与基站之间的上行通道为导通状态，信号上行信号全载波传输至基站。当未触发信号衰减单元321导通时，即开关单元为断开状态，完全抑制上行信号传输至基站。
在其中一些实施例中，参考图3，上行信号传输单元320还包括：延时器322，延时器322连接于所述上行信号传输单元320的输入端和信号衰减单元321之间。
在LTE制式分布式中继系统的上行信号接收端接收到用户端发送的上行信号后，分别发送至上行信号检测单元和上行信号传输单元，上行信号检测单元对接收到的上行信号进行目标上行信号的检测，上行信号传输单元中的延时器获取并缓存上行信号，缓存的时间为延时器的延时时间，并在信号衰减单元导通时将缓存的信号传输至基站。
需要说明的是，本实施例中的检测不同于前面对资源块的功率检测，而是对应于基带内等分成较大带宽(如1.08MHz)后所有对应频率宽度的频带内的瞬时功率的检测。这样做的先决条件是要求对应的上行用户信号要足够大(高)，因为检测门限要求排除噪声功率(注：噪声功率有峰均比，且要加上此峰均比，才不会被噪声所触发)。对于PRACH信道可以使用其占用的6个资源块加在一起计算，对应的占有带宽为1.08MHz。
在其中一些实施例中，所述延时器的延时范围包括：5us至10us。
此延时器用来抵消上述功率检测带来的时延(包括滤波过程时延)，通过时延器的时延使得检测到用户信号后并打通开关(刚好时延推迟到达)把刚才带有此用户信号的基带信号一点不漏的送往基站，不会因检测线路响应时延时间而丢掉这部分时段的用户信号，从而保证上述检测到的对应的基带信号完整。
图4为一实施例提供的上行噪声抑制方法的流程图，如图3所示，上行噪声抑制方法包括步骤410和步骤420，其中：
步骤410：检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号。
步骤420：在检测到所述LTE制式分布式中继系统接收到上行信号中存在所述目标上行信号的情况下，触发信号衰减单元导通，以使得接收到的上行信号在预设时间内被传输给基站，其中，所述信号衰减单元用于导通上行信号传输通路或者对所述上行信号进行衰 减后传输，且所述信号衰减单元在被触发导通后延迟所述预设时间恢复衰减。
本申请中，预设时间即为信号衰减单元321的导通延迟时间，导通延迟时间可以设置为大于或等于用户端持续发送多个上行信号的间隔时间，以使目标上行信号可以在可利用时延内及时传输至基站，避免由于检测时延错过上行信号的发送时间。在其中一些实施例中，所述预设时间的取值范围包括：300ms至6000ms。
参考图3，在信号衰减单元321为导通状态时，内置的延时模块开始计时，当在预设时间后仍未检测到上行通道传输目标上行信号，即没有任何一个资源块的功率大于预设门限，则认为目标上行信号又没有了，通过断开信号衰减单元321使得噪声被卡断，以消除无在线用户信号时段的噪声。一旦检测到目标上行信号则延时模块重新计时，以保证远端单元在线时用户暂时不发射信号时不会退出记忆。
与现有技术相比，本实施例提供的上行噪声抑制方法采用触发模式控制上行信号的传输，通过设置信号衰减单元延时关闭来解决信号处理延迟，即绕过滤波、功率检测及判断所需要的处理时间。具体地，在检测到目标上行信号后触发信号衰减单元导通，并在导通后要延迟预设时间后恢复衰减，以保证下一个目标上行信号可以在信号传送时间内传输至基站，从而可以解决相关技术中的噪声抑制方法由于信号处理时延而无法应用在射频接入的LTE制式分布式中继系统中的问题。
对于触发模式，当信号衰减单元为导通状态时，远端单元与基站之间的上行通道为导通状态，信号上行信号可以全载波传输至基站。当未触发信号衰减单元导通时，衰减程度可以完全衰减或部分衰减。完全衰减可以理解为完全抑制上行信号传输至基站，部分衰减可以理解为对上行信号进行衰减处理后至少一部分的上行信号被传输至基站。衰减处理可以为可设置型，如可以设置成将上行信号缩小3位，对应18dB，从而可以让大功率信号有衰减地传输至基站，减少信号传输的被堵机会，提高信号传输的流畅性。
可以理解的是，当未触发信号衰减单元导通时，对上行信号进行衰减处理后至少一部分的上行信号被传输至基站，从而可以在上行信号足够强时也可以到达基站实现通信，只是上行信号中的信号和噪声都被衰减了。
在其中一些实施例中，所述上行信号为宽带信号，所述上行信号传输通路中处于所述信号衰减单元之前的传输通路中还连接有延时器，所述方法还包括：配置所述延时器的延时范围。
在LTE制式分布式中继系统的上行信号接收端接收到用户端发送的上行信号后，分别发送至上行信号检测单元和上行信号传输单元，上行信号检测单元对接收到的上行信号进行目标上行信号的检测，上行信号传输单元中的延时器获取并缓存上行信号，缓存的时 间为延时器的延时时间，并在信号衰减单元导通时将缓存的信号传输至基站。
需要说明的是，本实施例中的检测不同于前面对资源块的功率检测，而是对应于基带内等分成较大带宽(如1.08MHz)后所有对应频率宽度的频带内的瞬时功率的检测。这样做的先决条件是要求对应的上行用户信号要足够大(高)，因为检测门限要求排除噪声功率(注：噪声功率有峰均比，且要加上此峰均比，才不会被噪声所触发)，对于PRACH信道可以使用其占用的6个资源块加在一起计算，对应的占有带宽为1.08MHz。
在其中一些实施例中，所述延时器的延时不小于检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号的处理时延。
本实施例中，所述延时器的延时范围包括：5us至10us。
此延时器用来抵消上述功率检测带来的时延(包括滤波过程时延)，通过时延器的时延使得检测到用户信号后并打通开关(刚好时延推迟到达)把刚才带有此用户信号的基带信号一点不漏的送往基站，不会因检测线路响应时延时间而丢掉这部分时段的用户信号，从而保证上述检测到的对应的基带信号完整。
在其中一些实施例中，所述检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号包括步骤510至步骤550，其中：
步骤510：获取所述上行信号的信号传输信道类型以及所述信道类型对应的调制规则。
步骤520：根据信号传输信道类型以及信道类型调制规则，获取上行信号的占用资源信息。
步骤530：通过分段滤波器组对占用资源信息进行滤波处理，得到与占用资源信息对应的预设带宽滤波器的数字信号。
步骤540：计算多个预设带宽滤波器的数字信号的功率并与预设门限进行比较。
步骤550：根据比较结果，确定所述上行信号中是否包含所述目标上行信号。
上行信号的信号传输信道类型以及所述信道类型对应的调制规则会影响上行信号的占用资源，因此判断所述上行信号中是否包含目标上行信号，可以按各自的信道调制(时频)规则以及同步于基站的信道动态分配时频规则，变更检测对应信道(时频)功率，从而提高判断准确率。本申请中，占用资源信息包括信号的功率信息。
具体地，对于PUSCH信道来说，手机信号按资源块传送，但对于PUCCH、SRS信号并不是占整个资源块，只占用资源块的部分资源。对于PUCCH信道和SRS信号，由于其并不占全整个资源块，因此按基站规范的占用资源来对应取用资源会更好，按资源块处理会降低判断灵敏度。另外，对于PRACH资源还跟系统帧序号等有关，所以需要按基站的系统帧序号予以同步处理。
参考图3，在获取到上行信号的占用资源信息后，将上行信号通过分段滤波器组，得到各资源块的数字信号；然后分别计算各资源块的数字信号的功率，并将各资源块数字信号功率与预设门限进行比较。如果每一数字信号功率均小于预设门限，则判断所述上行信号中不包含目标上行信号；如果任一资源块的所述数字信号的功率大于预设门限，则判断所述上行信号中包含目标上行信号。即只要有一个资源块的功率大于预设门限，就认为覆盖区有用户。
在其中一些实施例中，当任一所述功率大于预设门限时，通过或门输出信号触发信号衰减单元。
参考图3，将每一比较结果均输入至或门对应的接收端，当数字信号的功率大于或等于预设门限时，判断资源块的数字信号中包含目标上行信号，输出1至或门对应的接收端；当数字信号所有的资源块的功率小于预设门限时，判断该时间的所有的资源块的数字信号中不包含目标上行信号，输出0至或门对应的接收端。或门的输出端与信号衰减单元连接，当或门的任一接收端接收到1的信号时，或门的输出端输出1至信号衰减单元，触发信号衰减单元导通，从而导通远端单元与基站之间的上行通路，使上行信号通过上行通路传输至基站。
在其中一些实施例中，所述方法还包括：获取DAS系统中远端单元的数量；根据所述远端单元的数量设置所述预设门限。
远端单元的数量越多，需要消除噪声的压力会越大。本实施例通过提高预设门限去除覆盖边缘的用户，从而提高消噪比例，降低消噪压力。
在其中一些实施例中，所述方法还包括：当有较高(强)用户信号时，通过采用相应的较大带宽(如1.08MHz)滤波器及配合瞬时功率检测再配合一个延时器(基带信号延时)，可以避免由于检测时延而丢用户信号，尤其是用户初次发射上行信号的问题。
当有较高(强)用户信号时，如采用1.08MHz的类似按资源块分割的频域进行分割的较大带宽滤波器的通带带宽，这样滤波器的时延就比较小(2us～3us),使得总处理时延达到5us～10us，从而可以达到直放站系统的时延要求。
需要说明的是，一般地噪声(信号)的峰均比小于15dB，这样就可以通过设置高于15dB门槛使得噪声(信号)不会触发门限。而只有真正的手机信号(目标上行信号才会触发该门限，因此只有真正的手机上行信号才会被捕获到。在上行有足够高的载噪比时，可以设置对应的高载噪比门限。
在其中一些实施例中，所述计算多个预设带宽滤波器的数字信号的功率包括：
获取预设带宽滤波器的数字信号在任一时间位置的瞬时功率；
若所述瞬时功率中的任意一个大于所述预设门限，则判断所述上行信号中包含上行信号。
预设带宽通常为较大带宽，例如1.08MHz。对应上述滤波器，由于检测带宽加大，对取得其瞬时功率的时间减短，对应的滤波器时延也较短，从而可以相应地加快检测速度。在检测速度足够快时，可以首先把接收过来载波数据进行存储延时，同时检测上行信号中是否包含目标上行信号，若有，则将存储延时的数据传输至基站，从而避免出现堵住或错过初始接入信号的问题。
通过获取预设带宽滤波器数字信号在任一时间位置的瞬时功率，而不是前述的检测整个资源块的功率，从而缩短检测时间。通过信号延时器解决处理延迟，即补偿滤波、功率检测及判断所需要的处理时间，然后在检测到瞬时功率达到预设门限时触发信号衰减单元导通，以使得检测过程可以实时进行，无论在预设带宽滤波器的任何时间位置，只要达到判决条件就触发信号衰减单元导通。
需要说明的是，本实施例提供的检测方法与上述的资源块的功率判别方式并不相同。本实施例中的方法对用户上行信号的功率不作准确检测(如不取资源块功率)，仅是区分噪声与有用户的上行信号，且要在较高的上行载噪比的条件下才可以使用；另外也可以作为对资源块功率判别方法的补充，以用来对用户发射的较大功率的首次用户信号的判别和及时打通通道开关，从而避免原方法堵住首次资源块的问题。
在其中一些实施例中，还包括对数据进行统计，统计的数据可以包括哪些资源块有过用户信号以及占用数量等，用来记录该远端单元用户的使用比例。通过增加DAS系统工作数据统计过程，以利于后续对DAS系统进行优化。
需要说明的是，在上述流程中或者附图的流程图中示出的步骤可以在诸如FPGA系统中执行，另外，也可以采用一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
另外，结合图4描述的本申请实施例上行噪声抑制方法可以由计算机设备来实现。图6为根据本申请实施例的计算机设备的硬件结构示意图。
计算机设备可以包括处理器61以及存储有计算机程序指令的存储器62。
具体地，上述处理器61可以包括中央处理器(CPU)，或者特定集成电路(Application Specific Integrated Circuit，简称为ASIC)，或者可以被配置成实施本申请实施例的一个或多个集成电路。
其中，存储器62可以包括用于数据或指令的大容量存储器。举例来说而非限制，存 储器62可包括硬盘驱动器(Hard Disk Drive，简称为HDD)、软盘驱动器、固态驱动器(Solid State Drive，简称为SSD)、闪存、光盘、磁光盘、磁带或通用串行总线(Universal Serial Bus，简称为USB)驱动器或者两个或更多个以上这些的组合。在合适的情况下，存储器62可包括可移除或不可移除(或固定)的介质。在合适的情况下，存储器62可在数据处理装置的内部或外部。在特定实施例中，存储器62是非易失性(Non-Volatile)存储器。在特定实施例中，存储器62包括只读存储器(Read-Only Memory，简称为ROM)和随机存取存储器(Random Access Memory，简称为RAM)。在合适的情况下，该ROM可以是掩模编程的ROM、可编程ROM(Programmable Read-Only Memory，简称为PROM)、可擦除PROM(Erasable Programmable Read-Only Memory，简称为EPROM)、电可擦除PROM(Electrically Erasable Programmable Read-Only Memory，简称为EEPROM)、电可改写ROM(Electrically Alterable Read-Only Memory，简称为EAROM)或闪存(FLASH)或者两个或更多个以上这些的组合。在合适的情况下，该RAM可以是静态随机存取存储器(Static Random-Access Memory，简称为SRAM)或动态随机存取存储器(Dynamic Random Access Memory，简称为DRAM)，其中，DRAM可以是快速页模式动态随机存取存储器(Fast Page Mode Dynamic Random Access Memory，简称为FPMDRAM)、扩展数据输出动态随机存取存储器(Extended Date Out Dynamic Random Access Memory，简称为EDODRAM)、同步动态随机存取内存(Synchronous Dynamic Random-Access Memory，简称SDRAM)等。
存储器62可以用来存储或者缓存需要处理和/或通信使用的各种数据文件，以及处理器62所执行的可能的计算机程序指令。
处理器61通过读取并执行存储器62中存储的计算机程序指令，以实现上述实施例中的任意一种上行噪声抑制方法。
在其中一些实施例中，计算机设备还可包括通信接口63和总线60。其中，如图6所示，处理器61、存储器62、通信接口63通过总线60连接并完成相互间的通信。
通信接口63用于实现本申请实施例中各模块、装置、单元和/或设备之间的通信。通信端口63还可以实现与其他部件例如：外接设备、图像/数据采集设备、数据库、外部存储以及图像/数据处理工作站等之间进行数据通信。
总线60包括硬件、软件或两者，将计算机设备的部件彼此耦接在一起。总线60包括但不限于以下至少之一：数据总线(Data Bus)、地址总线(Address Bus)、控制总线(Control Bus)、扩展总线(Expansion Bus)、局部总线(Local Bus)。举例来说而非限制，总线60可包括图形加速接口(Accelerated Graphics Port，简称为AGP)或其他图形总线、增强工业标准架构(Extended Industry Standard Architecture，简称为EISA)总线、前端总线(Front  Side Bus，简称为FSB)、超传输(Hyper Transport，简称为HT)互连、工业标准架构(Industry Standard Architecture，简称为ISA)总线、无线带宽(InfiniBand)互连、低引脚数(Low Pin Count，简称为LPC)总线、存储器总线、微信道架构(Micro Channel Architecture，简称为MCA)总线、外围组件互连(Peripheral Component Interconnect，简称为PCI)总线、PCI-Express(PCI-X)总线、串行高级技术附件(Serial Advanced Technology Attachment，简称为SATA)总线、视频电子标准协会局部(Video Electronics Standards Association Local Bus，简称为VLB)总线或其他合适的总线或者两个或更多个以上这些的组合。在合适的情况下，总线60可包括一个或多个总线。尽管本申请实施例描述和示出了特定的总线，但本申请考虑任何合适的总线或互连。
该计算机设备可以基于获取到的程序指令，执行本申请实施例中的上行噪声抑制方法，从而实现结合图3描述的上行噪声抑制方法。
另外，结合上述实施例中的上行噪声抑制方法，本申请实施例可提供一种计算机可读存储介质来实现。该计算机可读存储介质上存储有计算机程序指令；该计算机程序指令被处理器执行时实现上述实施例中的任意一种上行噪声抑制方法。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种LTE制式分布式中继系统，其特征在于，所述LTE制式分布式中继系统包括上行信号检测单元和上行信号传输单元，所述上行信号检测单元包括检测端和控制端，所述上行信号传输单元包括输入端和输出端；其中：
    所述上行信号检测单元的检测端和所述上行信号传输单元的输入端均与所述LTE制式分布式中继系统的上行信号接收端连接；
    所述上行信号传输单元的输出端通过信号衰减单元与基站连接，所述上行信号检测单元的控制端与所述信号衰减单元连接，用于在所述上行信号检测单元检测到目标上行信号的情况下，触发所述信号衰减单元导通；
    所述信号衰减单元用于在导通后延迟预设时间恢复衰减。
  2. 根据权利要求1所述的LTE制式分布式中继系统，其中，所述信号衰减单元包括开关单元。
  3. 根据权利要求1所述的LTE制式分布式中继系统，其中，所述预设时间的取值范围包括：300ms至6000ms。
  4. 根据权利要求1所述的LTE制式分布式中继系统，其中，所述上行信号传输单元还包括：延时器，所述延时器连接于所述上行信号传输单元的输入端和所述信号衰减之间。
  5. 根据权利要求4所述的LTE制式分布式中继系统，其中，所述延时器的延时范围包括：5us至10us。
  6. 一种上行噪声抑制方法，其特征在于，所述方法包括：
    检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号；
    在检测到所述LTE制式分布式中继系统接收到上行信号中存在所述目标上行信号的情况下，触发信号衰减单元导通，以使得接收到的上行信号在预设时间内被传输给基站，其中，所述信号衰减单元用于导通上行信号传输通路或者对所述上行信号进行衰减后传输，且所述信号衰减单元在被触发导通后延迟所述预设时间恢复衰减。
  7. 根据权利要求6所述的上行噪声抑制方法，其中，所述上行信号为宽带信号，所述上行信号传输通路中处于所述信号衰减单元之前的传输通路中还连接有延时器，所述方法还包括：配置所述延时器的延时范围，其中，所述延时范围包括：5us至10us。
  8. 根据权利要求7所述的上行噪声抑制方法，其中，所述延时器的延时不小于检测LTE制式分布式中继系统接收到上行信号中是否存在目标上行信号的处理时延。
  9. 一种计算机设备，包括存储器、处理器以及存储在所述存储器上并可在所述处理器 上运行的计算机程序，其特征在于，所述处理器执行所述计算机程序时实现如权利要求6至8中任一项所述的上行噪声抑制方法。
  10. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现权利要求6至8中任一项所述的上行噪声抑制方法。
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