🗊Презентация Um Interface and Radio Channels

Категория: Технология
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Слайд 1


Um Interface and Radio Channels
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Um Interface and Radio Channels

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Contents Overview Processing of Voice Signal Radio Channel
Описание слайда:
Contents Overview Processing of Voice Signal Radio Channel

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Radio Interface
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Radio Interface

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Hierarchical Structure of Um Interface
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Hierarchical Structure of Um Interface

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Radio Access Technology
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Radio Access Technology

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Radio Access Technology
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Radio Access Technology

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Contents Overview Processing of Voice Signal Radio Channel
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Contents Overview Processing of Voice Signal Radio Channel

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Voice Signal Processing
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Voice Signal Processing

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Analog-Digital Conversion
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Analog-Digital Conversion

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Speech Coding The Enhance Full Rate coding mode is called CELP (Code Excited Linear Predictive Coding) The Full Rate coding mode is called RPE-LTP (Regular Pulse Excited-Long Term Prediction). The Half Rate coding mode is called VCELP (Vector-Sum Excited Linear Prediction)
Описание слайда:
Speech Coding The Enhance Full Rate coding mode is called CELP (Code Excited Linear Predictive Coding) The Full Rate coding mode is called RPE-LTP (Regular Pulse Excited-Long Term Prediction). The Half Rate coding mode is called VCELP (Vector-Sum Excited Linear Prediction)

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Channel Coding
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Channel Coding

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Interleaving
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Interleaving

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Interleaving
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Interleaving

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Voice Burst
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Voice Burst

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Voice Signal Processing
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Voice Signal Processing

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Timing Advance (TA)
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Timing Advance (TA)

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Timing Advance (TA)
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Timing Advance (TA)

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Frequency Hopping
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Frequency Hopping

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Frequency Hopping
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Frequency Hopping

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DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The transcoder at the RX terminal produces comfortable noise. VAD: Voice Activity Detection Implemented by the transcoder.
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DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The transcoder at the RX terminal produces comfortable noise. VAD: Voice Activity Detection Implemented by the transcoder.

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DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The transcoder at the RX terminal produces comfortable noise. VAD: Voice Activity Detection Implemented by the transcoder.
Описание слайда:
DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The transcoder at the RX terminal produces comfortable noise. VAD: Voice Activity Detection Implemented by the transcoder.

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Power Control Prolong battery life Reduce network interference Include both uplink power control and downlink power control Level and quality are taken into account BSC or BTS is the final adjudicator
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Power Control Prolong battery life Reduce network interference Include both uplink power control and downlink power control Level and quality are taken into account BSC or BTS is the final adjudicator

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Contents Overview Processing of Voice Signal Radio Channel
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Contents Overview Processing of Voice Signal Radio Channel

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Frame and Channel
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Frame and Channel

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Physical Channel of Logical Channel
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Physical Channel of Logical Channel

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Burst
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Burst

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Burst
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Burst

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Logical Channel Type GSM900 and DCS1800 have the same logical channel category
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Logical Channel Type GSM900 and DCS1800 have the same logical channel category

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Downlink Logical Channel
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Downlink Logical Channel

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Downlink Logical Channel
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Downlink Logical Channel

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Uplink Logical Channel
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Uplink Logical Channel

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Uplink Logical Channel
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Uplink Logical Channel

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Use of Logical Channels
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Use of Logical Channels

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Physical Combination of Logical Channel
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Physical Combination of Logical Channel

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Structure of Main BCCH
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Structure of Main BCCH

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Structure of Combined BCCH
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Structure of Combined BCCH

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Structure of Logical Channel Combination Frame-Main SDCCH
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Structure of Logical Channel Combination Frame-Main SDCCH

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Structure of Logical Channel Combination Frame-TCH
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Structure of Logical Channel Combination Frame-TCH

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Frame
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Frame

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Frame
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Frame

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Configuration of Common Control Channel
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Configuration of Common Control Channel

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Summary In this course, we have learned: Processing of Voice Signal Radio Channel in Um Interface Key Technical in Um Interface
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Summary In this course, we have learned: Processing of Voice Signal Radio Channel in Um Interface Key Technical in Um Interface

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Um Interface and Radio Channels, слайд №43
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