List of PPDUs Supported in 802.11g
What is a PPDU in IEEE 802.11g?
The Physical Protocol Data Unit is the data packet format transmitted over the physical layer.
What components make up the 802.11g PPDU?
A preamble, SIGNAL field, and data payload encoded using OFDM or DSSS.
What is the purpose of the preamble in the PPDU?
It helps the receiver synchronize timing and perform channel estimation.
How does 802.11g maintain backward compatibility in PPDU?
By supporting both OFDM and DSSS/CCK modulation schemes in the PPDU.
What modulation does 802.11g primarily use?
Orthogonal Frequency Division Multiplexing (OFDM) for high-speed data.
What does the SIGNAL field indicate?
The data rate and length of the transmitted frame.
How is error correction applied in PPDU?
Through convolutional coding and interleaving of the payload.
What is the role of OFDM symbols in the PPDU?
They carry encoded data across multiple subcarriers for robustness.
Are there different PPDU formats in 802.11g?
Yes, including OFDM and DSSS/CCK legacy formats.
How does the receiver decode the PPDU?
It first processes the preamble, then demodulates and decodes the payload.
What frequency band does 802.11g PPDU use?
The 2.4 GHz ISM band.
Can the PPDU adapt to channel conditions?
Yes, by varying modulation and coding rates dynamically.
What is the significance of the Service field in PPDU?
It provides padding and scrambling for data integrity.
How does interleaving improve PPDU performance?
It spreads errors across symbols to enhance error correction.
Does PPDU contain synchronization information?
Yes, in the preamble to align transmitter and receiver clocks.
How large can the PPDU payload be?
Up to the maximum MSDU size defined by 802.11 standards.
What is the typical duration of an 802.11g PPDU?
Varies depending on data rate and payload size, typically milliseconds.
Why is PPDU critical for wireless communication?
It ensures data is formatted, synchronized, and encoded for reliable transmission.
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