單項選擇題CDMA占用的載頻上行和下行各為()

A.825MHz-835MHz 870MHz-880MHz
B.815MHz-825MHz 860MHz-870MHz
C.815MHz-825MHz 870MHz-880MHz
D.825MHz-835MHz 860MHz-870MHz


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1.單項選擇題CDMA語音業(yè)務(wù)信道編碼一般采用()

A.TURBO編碼
B.香農(nóng)編碼
C.卷積編碼
D.SBC子帶編碼

2.單項選擇題CDMA語音信令流程正確的是()

A.originationmessage→BSACK→TCHpreamble→Channelassignmentmessage→BSACK→MSACK→ServiceConnectmessage→Serviceconnectcompletion→assignmentcomplete
B.originationmessage→BSACK→ServiceConnectmessage→TCHpreamble→BSACK→MSACK→Channelassignmentmessage→Serviceconnectcompletion→assignmentcomplete
C.originationmessage→BSACK→Channelassignmentmessage→TCHpreamble→BSACK→MSACK→ServiceConnectmessage→Serviceconnectcompletion→assignmentcomplete
D.OriginationMessage→CMServiceRequest→TchPreamble→Establish→AssignmentComplete→Allocation;

3.單項選擇題CDMA用戶跨過BSC邊界并完成切換,這個切換是()

A.軟切換
B.硬切換
C.不一定

4.單項選擇題CDMA移動臺的噪聲系數(shù)一般為()dB,

A.3~5
B.6~8
C.8~10
D.10~12

5.單項選擇題CDMA信道處理過程中,原始的信息單元是()

A.比特
B.符號
C.碼片
D.信元