6ES7332-5HD01-0AB0
6ES7332-5HD01-0AB0
6ES7332-5HD01-0AB0
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速度就意味著生產(chǎn)量：生產(chǎn)量越高，資金和人力資源的使用效率就越高。由于無(wú)源標(biāo)簽從RFID閱讀器獲得它們正常工作所需的能量，多個(gè)閱讀器可能導(dǎo)致標(biāo)簽試圖對(duì)詢問它的每一個(gè)閱讀器都進(jìn)行響應(yīng)。在多閱讀器情況下，為改善系統(tǒng)的吞吐量需要使用某種防沖突協(xié)議。最后，為最大化標(biāo)簽的讀取范圍，載波對(duì)噪聲(carriertonoise)的要求應(yīng)當(dāng)最小化，但是這可能與通過(guò)最小化載波的不工作時(shí)間以防止標(biāo)簽耗盡能量的需要相沖突。這些優(yōu)化措施對(duì)工程師和測(cè)量設(shè)備提出了挑戰(zhàn)。
讓我們看一個(gè)具體的例子——優(yōu)化通信速度，也稱為翻轉(zhuǎn)時(shí)間TAT(以下簡(jiǎn)稱TAT)?？捎玫腞F能量、路徑衰落和經(jīng)過(guò)更改的符號(hào)速率能延長(zhǎng)標(biāo)簽對(duì)閱讀器查詢的響應(yīng)時(shí)間。響應(yīng)越慢，讀取多個(gè)標(biāo)簽所花費(fèi)的時(shí)間就越長(zhǎng)?？焖贉y(cè)量TAT對(duì)優(yōu)化RFID系統(tǒng)的速度是非常必要的。
使用RTSA可以很容易地測(cè)量TAT。首先，需要安裝一個(gè)頻率模板觸發(fā)器以獲取標(biāo)簽與閱讀器之間的整個(gè)查詢。RTSA的功率與時(shí)間關(guān)系視圖使用戶能夠觀看整個(gè)發(fā)射過(guò)程。習(xí)慣認(rèn)為一個(gè)下行鏈路傳輸(由閱讀器到標(biāo)簽)結(jié)束到下一個(gè)下行鏈路傳輸開始之間的時(shí)間就是半雙工系統(tǒng)的TAT。將一個(gè)標(biāo)記放在標(biāo)簽詢問的結(jié)束點(diǎn)，第二個(gè)δ標(biāo)記置于反向散射的結(jié)束點(diǎn)或下一次閱讀器進(jìn)行數(shù)據(jù)發(fā)射的開始點(diǎn)，就可以精確測(cè)量出TAT時(shí)間。在大范圍下行鏈路的條件下維持最短的TAT將有助于系統(tǒng)吞吐量的最大化。
RTSA也能解調(diào)與標(biāo)簽查詢相關(guān)的符號(hào)或比特。用戶只需選擇相應(yīng)的RFID標(biāo)準(zhǔn)、調(diào)制類型和解碼格式。分析儀能自動(dòng)檢測(cè)并顯示鏈路的比特率。為進(jìn)一步提高工程師的生產(chǎn)效率，對(duì)恢復(fù)出的數(shù)據(jù)符號(hào)進(jìn)行了基于功能的顏色編碼(color-coded)。RTSA能夠自動(dòng)識(shí)別前導(dǎo)符并將那些符號(hào)染成黃色。這易于識(shí)別實(shí)際的數(shù)據(jù)負(fù)荷并與已知值進(jìn)行比較。
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