List of PPDUs Supported in 802.11a
What does PPDU stand for in 802.11a?
PPDU stands for Physical Layer Protocol Data Unit, which is the unit of data exchanged at the physical layer.
How many types of PPDUs does 802.11a support?
802.11a supports one main PPDU type based on OFDM modulation.
What modulation technique is used in 802.11a PPDUs?
Orthogonal Frequency Division Multiplexing (OFDM).
What are the data rates supported by 802.11a PPDUs?
6, 9, 12, 18, 24, 36, 48, and 54 Mbps.
What fields are present in the 802.11a PPDU?
Preamble, Signal, and Data fields.
What is the purpose of the preamble in 802.11a PPDU?
It allows synchronization, channel estimation, and automatic gain control.
How long is the preamble in 802.11a?
16 microseconds.
What is the Signal field in 802.11a PPDU?
It contains information about the data rate and length of the payload.
What modulation does the Signal field use?
BPSK with rate 1/2 coding.
What is the Data field in 802.11a PPDU?
The actual payload data, modulated according to the selected data rate.
Are there different PPDU formats for control and management frames in 802.11a?
Control frames generally use a different, simpler format but still conform to the overall PPDU structure.
Is there a Short Preamble PPDU format in 802.11a?
No, the short preamble is defined in 802.11b but not in 802.11a.
What is the symbol duration in 802.11a PPDU?
4 microseconds.
How many OFDM subcarriers are used in 802.11a PPDU?
52 subcarriers: 48 data and 4 pilot carriers.
What error correction coding is used in 802.11a PPDU?
Convolutional coding with rates 1/2, 2/3, and 3/4.
Does 802.11a support multiple PPDU formats?
No, 802.11a uses a single OFDM-based PPDU format.
What is the maximum PPDU length in 802.11a?
The maximum MPDU size is 2304 bytes, which affects PPDU length.
How does the PPDU format affect data rate?
The modulation and coding scheme specified in the PPDU determines the data rate.
Are the PPDU formats backward compatible with earlier 802.11 standards?
No, 802.11a PPDU is not compatible with DSSS/CCK used in 802.11b/g.
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