Time division multiple access - Alchetron, the free social encyclopedia
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Time division multiple access - Alchetron, the free social encyclopedia
Time division multiple access (TDMA) is a channel access method for shared medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot. This al
Jun 25, 2018
Time-division multiple access Basics
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GSM的分時多工雜訊(TDD Noise，Time Division Duplex Noise) 以前的2G GSM手機，在打電話時或是電話正要響起前，若是太靠近內建聲音放大器的喇叭(例如電腦喇叭、音響喇叭、擴音器等)，會聽到喇叭發出一陣規律的雜音 因為GSM是採TDMA(Time Division Multiple Access，分時多工)，在相同的頻段內利用不同時間點傳送不同使用者的語音資料，手機間歇發送無線電波的週期是4.615ms，換算成頻率約217Hz 手機撥出時或來電時，因為開始與基地台交換資料，手機會以最大功率發射無線電波，這個間歇發射的無線電波被聲音放大器擷取到後經過放大，就從喇叭發出規律的雜音，當手機與基地台建立連線以後，會視信號強度調整發射功率，若所在地的信號狀況不錯，手機不需要大功率發射時，這時就會聽到雜音變小或是消失 這種無線電波間歇發射造成的電源及信號干擾也會存在於手機內部，如果手機內部對於電源干擾及信號屏蔽處理不好，這個TDD Noise也會在手機通話時出現而影響通話及收音的品質 | 愛搞電的港都狼仔
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GSM的分時多工雜訊(TDD Noise，Time Division Duplex Noise) 以前的2G GSM手機，在打電話時或是電話正要響起前，若是太靠近內建聲音放大器的喇叭(例如電腦喇叭、音響喇叭、擴音器等)，會聽到喇叭發出一陣規律的雜音 因為GSM是採TDMA(Time Division Multiple Access，分時多工)，在相同的頻段內利用不同時間點傳送不同使用者的語音資料，手機間歇發送無線電波的週期是4.615ms，換算成頻率約217Hz 手機撥出時或來電時，因為開始與基地台交換資料，手機會以最大功率發射無線電波，這個間歇發射的無線電波被聲音放大器擷取到後經過放大，就從喇叭發出規律的雜音，當手機與基地台建立連線以後，會視信號強度調整發射功率，若所在地的信號狀況不錯，手機不需要大功率發射時，這時就會聽到雜音變小或是消失 這種無線電波間歇發射造成的電源及信號干擾也會存在於手機內部，如果手機內部對於電源干擾及信號屏蔽處理不好，這個TDD Noise也會在手機通話時出現而影響通話及收音的品質 | 愛搞電的港都狼仔
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