The 802.11 physical layer standard defines some common operations of the wireless network at the physical layer: operations such as QoS, security, and roaming.
Answer(s): B
The Barker code is an 11-bit sequence (for example, 10110111000), which has advantages in wireless transmission, which can effectively reduce interference, but reduces efficiency.
Answer(s): A
802.11b is a protocol based on Orthogonal Frequency Division Multiplexing (OFDM) technology.
The 802.11n standard uses dual-band (2.4 GHz and 5 GHz), the theoretical transmission rate can reach up to 300 Mbps, and the actual test rate can reach more than 100 Mbps.
The modulation methods adopted by DSSS are BPSK and QPSK respectively.
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