描述

A413305 AOR4C

差錯(cuò)控制是指對(duì)傳輸?shù)臄?shù)據(jù)信號(hào)進(jìn)行檢測(cè)錯(cuò)誤和糾正錯(cuò)誤。實(shí)際中常用的差錯(cuò)控制方式主要有以下4種：

自動(dòng)檢錯(cuò)重傳(ARQ)在這種方式中，發(fā)送端按編碼規(guī)則對(duì)擬發(fā)送的信號(hào)碼附加冗余碼后，再發(fā)送出去。接收端對(duì)收到的信號(hào)序列進(jìn)行差錯(cuò)檢測(cè)，判決有無錯(cuò)碼，并通過反饋信道把判決結(jié)果送回到發(fā)送端。若判決有錯(cuò)碼，發(fā)送端就重新發(fā)送原來的數(shù)據(jù)，直到接收端認(rèn)為無差錯(cuò)為止；若判決為無錯(cuò)碼，發(fā)送端就可以繼續(xù)傳送下一個(gè)新的數(shù)據(jù)。

前向糾錯(cuò)(FEC)在這種方式中，發(fā)送端按照一定的編碼規(guī)則對(duì)擬發(fā)送的信號(hào)碼元附加冗余碼，構(gòu)成糾錯(cuò)碼。接收端將附加冗余碼元按照一定的譯碼規(guī)則進(jìn)行變換，檢測(cè)信號(hào)中有無錯(cuò)碼，若有錯(cuò)碼，自動(dòng)確定錯(cuò)碼位置，并加以糾正。該方式物理實(shí)現(xiàn)簡單，無需反饋信道，適用于實(shí)時(shí)通信系統(tǒng)，但譯碼器一般比較復(fù)雜。

混合糾錯(cuò)混合糾錯(cuò)方式是前向糾錯(cuò)與自動(dòng)檢錯(cuò)重傳兩種方式的綜合，發(fā)送端發(fā)送具有檢測(cè)和糾錯(cuò)能力的碼元，接收端將通過反饋信道要求發(fā)送端重新發(fā)送該信息?；旌霞m錯(cuò)方式綜合了ARQ和FEC兩者的優(yōu)點(diǎn)，卻未能克服它們各自的缺點(diǎn)，因而在實(shí)際應(yīng)用中受到了一定的限制。

不用編碼的差錯(cuò)控制不用編碼的差錯(cuò)控制是指不需要對(duì)傳輸?shù)男盘?hào)碼元進(jìn)行信號(hào)編碼，而在傳輸方法中附加冗余措施來減少傳輸中的差錯(cuò)。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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