DSSS和FSK都是无线局域网采用的调制技术。

直序扩频传输（DSSS）最多（）个信道重叠.

在WLAN中，扩展频谱技术具体包括（）。

A:DSSS B:FHSS C:OFDM D:CDMA

以下哪种技术或功能不属于Wlan物理层（）

A:DSSS B:PCF C:OFDM D:FHSS

IEEE802.11g采用效率较高的（）调制技术。

A:QPSK B:DSSS C:OFDM D:FHSS

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in small pieces over a number of the （）frequencies availablefor use at any time in the specified range. Devices using （） spread spectrum (DSSS) communicate by （） each byte of data into several parts and sending them concurrently on different （） . DSSS uses a lot of the available （） , about 22 megahertz (MHz).

A:direct-sequence B:discrete-sequence C:duplicate-sequence D:dedicate-sequence

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in small pieces over a number of the （）frequencies availablefor use at any time in the specified range. Devices using （） spread spectrum (DSSS) communicate by （） each byte of data into several parts and sending them concurrently on different （） . DSSS uses a lot of the available （） , about 22 megahertz (MHz).

A:rate B:velocity C:bandwidth D:period

Spread spectrum simply means that data is sent in small pieces Over a number of the (46) frequencies available for use at any time in the specified range. Devices using (47) spread spectrum (DSSS) communicate by (48) each byte of data into several parts and sending them concurrently on different (49) . DSSS uses a lot of the available (50) , about 22 megahertz (MHz) .

A:continuous B:high C:low D:discrete

Spread spectrum simply means that data is sent in small pieces Over a number of the (46) frequencies available for use at any time in the specified range. Devices using (47) spread spectrum (DSSS) communicate by (48) each byte of data into several parts and sending them concurrently on different (49) . DSSS uses a lot of the available (50) , about 22 megahertz (MHz) .

A:rate B:velocity C:bandwidth D:period

Spread spectrum simply means that data is sent in small pieces Over a number of the (46) frequencies available for use at any time in the specified range. Devices using (47) spread spectrum (DSSS) communicate by (48) each byte of data into several parts and sending them concurrently on different (49) . DSSS uses a lot of the available (50) , about 22 megahertz (MHz) .

A:direct-sequence B:discrete-sequence C:duplicate-sequence D:dedicate-sequence