802.11g PHYs
What is the PHY in IEEE 802.11g?
The PHY transmits and receives data over the 2.4 GHz band using OFDM and DSSS.
What modulation does 802.11g use?
802.11g uses OFDM like 802.11a and DSSS/CCK for backward compatibility with 802.11b.
What data rates are supported by 802.11g PHY?
Data rates include 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, and 54 Mbps.
What is OFDM in 802.11g?
Orthogonal Frequency Division Multiplexing splits data over multiple subcarriers for better efficiency and robustness.
How many subcarriers are used in 802.11g OFDM?
Same as 802.11a, 52 subcarriers (48 data + 4 pilot).
What is the channel width in 802.11g?
20 MHz channel bandwidth, same as 802.11b and 802.11a.
How many channels are available in 802.11g?
11 channels in the 2.4 GHz band, with 3 non-overlapping channels (1, 6, 11).
Is 802.11g backward compatible?
Yes, it supports 802.11b modulation schemes for interoperability.
What is the typical range of 802.11g?
Similar to 802.11b, around 100 meters indoors.
Does 802.11g support OFDM guard intervals?
Yes, it uses a 0.8 µs guard interval like 802.11a.
Does 802.11g support MIMO?
No, MIMO is introduced in later standards (802.11n and beyond).
Is 802.11g half-duplex or full-duplex?
Half-duplex operation.
Is 802.11g still used today?
Yes, though largely replaced by newer standards, it remains in use for legacy support.
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