802.11ay PHYs
What is the PHY in IEEE 802.11ay?
The PHY (Physical Layer) in IEEE 802.11ay is an enhanced version of the 802.11ad PHY, designed for high throughput operation in the 60 GHz band with support for wider channels, MIMO, and channel bonding.
What modulation does 802.11ay use?
802.11ay uses Single Carrier (SC) and Orthogonal Frequency Division Multiplexing (OFDM) modulation schemes with higher order modulations like π/2-QPSK, π/2-16QAM, and π/2-64QAM for improved spectral efficiency.
What is the channel bandwidth in 802.11ay?
The standard supports a base channel bandwidth of 2.16 GHz with channel bonding options up to 8.64 GHz (using 2, 3, or 4 contiguous channels).
How many spatial streams does 802.11ay support?
802.11ay supports up to 4 spatial streams using MIMO technology, enabling high data throughput.
What data rates can 802.11ay achieve?
Link rates can range from 20 Gbps up to 40 Gbps and beyond depending on channel bonding and MIMO configurations.
Does 802.11ay include both OFDM and Single Carrier PHY modes?
Yes, 802.11ay includes both Single Carrier and OFDM PHY modes, building on 802.11ad’s PHY options.
What is channel bonding in 802.11ay?
Channel bonding combines two or more adjacent 2.16 GHz channels to create wider bandwidth for increased throughput.
Is 802.11ay backward compatible with 802.11ad?
Yes, it supports backward compatibility with 802.11ad devices to ensure interoperability.
What kind of coding schemes are used in 802.11ay?
802.11ay uses LDPC (Low-Density Parity Check) codes with different block sizes, providing robust error correction.
What is the PPDU format in 802.11ay?
The PPDU (Physical Protocol Data Unit) supports different PHY modes (SC, OFDM), includes fields for channel bonding, MIMO, beamforming, and training sequences.
How does 802.11ay improve over 802.11ad?
802.11ay offers higher throughput, better range with MIMO, wider channel bandwidths via bonding, and enhanced robustness in the 60 GHz band.
What frequency band does 802.11ay operate in?
802.11ay operates in the 60 GHz unlicensed band, typically from 57 GHz to 71 GHz.
Does 802.11ay support beamforming?
Yes, beamforming is an essential part of the PHY for directional transmission and reception to overcome high path loss at 60 GHz.
What is the typical range of 802.11ay?
Due to high frequencies, range is generally short indoors (~10 meters), but extended with beamforming and high gain antennas.
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