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    11 Automatic Transmit Power Control

    Uploaded by

    JoseMiguelBlancoAlvarez
    Automatic transmit power control (ATPC) allows radios to dynamically adjust their transmission power based on link quality measurements, rather than using a fixed power level. This improves efficiency and reduces interference. ATPC works by establishing a feedback channel where the receiving radio reports the received signal level to the transmitting radio. The transmitter then adjusts its power up or down as needed to maintain the received signal level at the reference input level set for the link. Using ATPC on both ends of a radio link allows the most minimal transmission power levels needed to maintain quality communication as environmental conditions change over time.

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    © All Rights Reserved
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    11 Automatic Transmit Power Control

    Uploaded by

    JoseMiguelBlancoAlvarez
    185 views5 pages
    Automatic transmit power control (ATPC) allows radios to dynamically adjust their transmission power based on link quality measurements, rather than using a fixed power level. This improves efficiency and reduces interference. ATPC works by establishing a feedback channel where the receiving radio reports the received signal level to the transmitting radio. The transmitter then adjusts its power up or down as needed to maintain the received signal level at the reference input level set for the link. Using ATPC on both ends of a radio link allows the most minimal transmission power levels needed to maintain quality communication as environmental conditions change over time.

    Original Description:

    ATPC control automatico de potencia CERAGON

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    Automatic transmit power control (ATPC) allows radios to dynamically adjust their transmission power based on link quality measurements, rather than using a fixed power level. This improves efficiency and reduces interference. ATPC works by establishing a feedback channel where the receiving radio reports the received signal level to the transmitting radio. The transmitter then adjusts its power up or down as needed to maintain the received signal level at the reference input level set for the link. Using ATPC on both ends of a radio link allows the most minimal transmission power levels needed to maintain quality communication as environmental conditions change over time.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    185 views5 pages

    11 Automatic Transmit Power Control

    Uploaded by

    JoseMiguelBlancoAlvarez
    Automatic transmit power control (ATPC) allows radios to dynamically adjust their transmission power based on link quality measurements, rather than using a fixed power level. This improves efficiency and reduces interference. ATPC works by establishing a feedback channel where the receiving radio reports the received signal level to the transmitting radio. The transmitter then adjusts its power up or down as needed to maintain the received signal level at the reference input level set for the link. Using ATPC on both ends of a radio link allows the most minimal transmission power levels needed to maintain quality communication as environmental conditions change over time.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 5

    Automatic Transmit Power Control - ATPC

    Agenda
    Why ATPC?

    How does ATPC works?


    ATPC Vs. MTPC
    ATPC Configuration

    Proprietary and Confidential

    ATPC Automatic Transmit Power Control


    The quality of radio communication between low Power devices varies
    significantly with time and environment.
    This phenomenon indicates that static transmission power, transmission range,
    and link quality, might not be effective in the physical world.
    Static transmission set to max. may reduce lifetime of Transmitter
    Side-lobes may affect nearby Receivers (image)
    Main Lobe
    Side Lobe

    Proprietary and Confidential

    ATPC Automatic Transmit Power Control


    1. Enable ATPC on both sites
    2. Set Input reference level (min. possible RSL to maintain the radio link)

    3. ATPC on both ends establish a Feedback Channel through the radio link (1byte)
    4. Transmitters will reduce Output power to the min. possible level
    5. Power reduction stops when RSL in remote receiver reaches Ref. input level
    6. ATPC is strongly recommended with XPIC configuration

    TSL Adjustments

    ATPC
    module

    Site A

    Monitored RSL

    Radio
    Transceiver

    Radio

    Radio
    Receiver

    Feedback

    Radio
    Receiver
    Signal
    Quality
    Check

    Proprietary and Confidential

    Ref. RSL

    RSL
    required
    change
    Site B

    ATPC Example when ATPC is OFF

    Site A

    FSL= -60 dB

    Site B

    MTPC

    MTPC

    TSL A = 30dBm
    RSL A = ?

    TSL B = 30dBm
    RSL B = ?

    RSL A = -30dBm (TSL B + FSL)

    RSL B = -30dBm (TSL A + FSL)

    Proprietary and Confidential

    ATPC Example when ATPC is ON (One site ATPC, second site MTPC)

    Site A

    FSL= -60 dB

    Site B

    ATPC
    IRLB (Input Ref. level on Site B) = -50dBm

    MTPC

    TSL A = ?
    RSL A = ?

    TSL B = 30dBm
    RSL B =?

    TSL A = 10dBm (IRLB-FSL)

    RSL B = -50dBm (TSL A + FSL)

    RSL A = -30dBm (TSL B + FSL)


    You want -50dBm on Site B, so what is TXA in Site A?
    6

    Proprietary and Confidential

    ATPC Example when ATPC is ON (ATPC on both sites)

    Site A

    FSL= -60 dB

    Site B

    ATPC
    IRLB (Input Ref. level on Site B) = -50dBm

    ATPC
    IRLA (Input Ref. level on Site A) = -50dBm

    TSL A = ?
    RSL A = ?

    TSL B = ?
    RSL B = ?

    TSL A = 10dBm (IRLB - FSL)

    TSL B = 10dBm (IRLA-FSL)

    RSL A = -50dBm (TSLB + FSL)

    RSL B = -50dBm (TSL A + FSL)

    Proprietary and Confidential

    ATPC Example when ATPC is ON (ATPC on both sites), ATPC range


    Max TSL is 30dBm
    ATPC range is 20dB

    Site A

    Max TSL is 30dBm


    ATPC range is 20dB

    FSL= -60 dB

    Site B

    ATPC
    IRLB (Input Ref. level on Site B) = -60dBm

    ATPC
    IRLA (Input Ref. level on Site A) = -50dBm

    TSL A = ?
    RSL A = ?

    TSL B = ?
    RSL B = ?

    TSL A = 10dBm (IRLB-FSL)

    TSL B = 10dBm (IRLA - FSL)

    RSL A = -50dBm (TSL B + FSL)

    RSL B = -50dBm (TSL A + FSL)

    RSL B is -50dBm because typical ATPC range for TX level is 20dB (depend on RFU type)!!!
    It means that TSL A cant be 0dBm because possible min is 10dBm (Max is 30dBm)
    8

    Proprietary and Confidential

    ATPC Configuration

    Proprietary and Confidential

    Thank You

    10

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