802.11bn PHYs
What is IEEE 802.11bn?
IEEE 802.11bn is the Wi-Fi 7 amendment tailored specifically for operation in the 2.4 GHz band, extending Wi-Fi 7 features to this band.
Which frequency band does 802.11bn operate in?
802.11bn operates exclusively in the 2.4 GHz ISM band (2400 MHz to 2483.5 MHz).
What channel bandwidths does 802.11bn support?
It supports 20 MHz and 40 MHz channel bandwidths, optimized for 2.4 GHz band constraints.
Does 802.11bn support 80 MHz or 160 MHz channels like other Wi-Fi 7 variants?
No, due to limited spectrum and interference in 2.4 GHz, 802.11bn does not support channels wider than 40 MHz.
What modulation schemes are used in 802.11bn?
802.11bn supports up to 4096-QAM, providing higher data rates even on narrower channels.
Does 802.11bn use OFDM?
Yes, it uses OFDM with enhancements for better robustness in the crowded 2.4 GHz band.
What coding scheme does 802.11bn use?
It uses Low-Density Parity-Check (LDPC) codes for error correction and improved reliability.
How many spatial streams does 802.11bn support?
802.11bn supports up to 8 spatial streams, enabling high throughput even on 2.4 GHz.
What is the maximum theoretical data rate in 802.11bn?
Maximum data rates can reach several Gbps with 40 MHz channels, 8 spatial streams, and 4096-QAM.
Does 802.11bn support Multi-Link Operation (MLO)?
Yes, it supports MLO allowing simultaneous transmissions on 2.4 GHz and other bands to improve throughput and reduce latency.
What is the guard interval in 802.11bn?
Supports multiple guard intervals, including 0.8 µs and 0.4 µs, for latency and throughput optimization.
Does 802.11bn support OFDMA?
Yes, OFDMA is supported to improve spectrum utilization and reduce contention in the 2.4 GHz band.
How does 802.11bn handle interference in the 2.4 GHz band?
It uses advanced interference mitigation techniques including dynamic frequency selection, adaptive modulation, and MLO.
Is 802.11bn backward compatible?
Yes, it supports backward compatibility with legacy 802.11b/g/n devices in the 2.4 GHz band.
What is the FFT size used in 802.11bn?
Typically uses 64-point FFT for 20 MHz channels and 128-point FFT for 40 MHz channels.
How wide are 802.11bn channels in MHz?
Supports 20 MHz and 40 MHz channels; no wider channels due to spectrum limitations.
How does 802.11bn improve latency?
Features such as MLO and shorter guard intervals reduce transmission delays and improve responsiveness.
What is the impact of 802.11bn on power consumption?
Efficient scheduling and MLO help optimize power use, but higher data rates and processing can increase consumption compared to legacy 2.4 GHz devices.
Does 802.11bn support uplink and downlink MU-MIMO?
Yes, supports multi-user MIMO in both uplink and downlink directions.
What new features does 802.11bn bring to the 2.4 GHz band?
Brings Wi-Fi 7 capabilities like MLO, 4096-QAM, OFDMA, and improved spatial streams to the traditionally limited 2.4 GHz band.
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