题目
第1题
CDMA是英文Code Division Multiple Access的字头缩写,中文意思是() ,是最近才被应用于商业的一种数字接口技术.
第3题
第4题
第7题
A. transfer control protocol
B. time division duplex
C. time division synchronous CDMA
D. time division multiple access
第8题
Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) .It is a () information transfer mode.
A.connection oriented
B.connectionless
C.high bandwidth utilization
D.poor real-time
第9题
CDMA for cellular system can be described as follows. As with FDMA, each cell is allocated a frequency (71) , when is split into two parts, half for reverse (mobile unit to base station) and half for (72) (base station to mobile unit). For full-duplex (73) , a mobile unit both reverse and forward channels. Transmission is in the form. of direct-sequence spread (74) , which used a chipping code to increase the data rate of the transmission, resulting is an increased signal bandwidth. Multiple access is provided by assigning (75) chipping codes to multiple users, so that the receiver can recover the transmission of an individual unit from multiple transmissions.
A.ware
B.signal
C.bandwidth
D.domain
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