6.2DPSK系統(tǒng)是一種實(shí)用的數(shù)字調(diào)相系統(tǒng)，其抗加性白噪聲性能與2PSK相比是(      )

A.好于2PSK                                                    B.時(shí)好時(shí)差

C.相同                                                             D.差于2PSK

7.CCITT為程控?cái)?shù)字交換機(jī)的模擬用戶規(guī)定的BORSCHT功能含有(      )

A.6項(xiàng)功能                                                       B.7項(xiàng)功能

C.8項(xiàng)功能                                                       D.9項(xiàng)功能

8.在PCM時(shí)分復(fù)用一次群中，每一路基帶信號(hào)占用幀內(nèi)的一個(gè)(      )

A.時(shí)隙                                                             B.空間

C.位置                                                             D.頻點(diǎn)

9.多普勒擴(kuò)展引起的衰落與(      )

A.時(shí)間有關(guān)                                                      B.建筑物高度有關(guān)

C.距離有關(guān)                                                      D.空氣折射率有關(guān)

10.跳時(shí)碼分多址主要是用于(      )

A.第一代移動(dòng)通信領(lǐng)域                                    B.軍事抗干擾通信領(lǐng)域

C.第二代移動(dòng)通信設(shè)備                                    D.第二代半移動(dòng)通信網(wǎng)絡(luò)