802.11ax Physical Rates ========================= .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the range of physical data rates supported by IEEE 802.11ax?** 802.11ax supports data rates from as low as 0.3 Mbps up to 9.6 Gbps depending on channel width and MCS. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What modulation schemes are used in 802.11ax physical rates?** Uses OFDMA with modulation types including BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, and optional 1024-QAM. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does channel bandwidth affect physical rates in 802.11ax?** Wider channels (20, 40, 80, 160 MHz) allow more data to be transmitted simultaneously, increasing max rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is MCS in the context of 802.11ax physical rates?** Modulation and Coding Scheme defines combinations of modulation type and error correction rate affecting throughput. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ax support multi-user transmissions?** Yes, physical rates reflect multi-user OFDMA and MU-MIMO capabilities for simultaneous transmissions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the highest modulation order in 802.11ax?** 1024-QAM (Quadrature Amplitude Modulation), allowing higher data rates than previous standards. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 1024-QAM improve data rates?** It encodes more bits per symbol (10 bits vs 8 bits for 256-QAM), boosting throughput in good signal conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What role do spatial streams play in physical rates?** Multiple spatial streams allow parallel data transmission via MU-MIMO, multiplying throughput. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How many spatial streams does 802.11ax support?** Up to 8 spatial streams for both uplink and downlink. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does OFDMA affect physical rates?** OFDMA divides channels into smaller Resource Units, allowing efficient simultaneous transmissions to multiple users. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can physical rates adapt dynamically in 802.11ax?** Yes, rate adaptation algorithms select MCS and resource allocation based on real-time channel conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What channel widths does 802.11ax support?** 20 MHz, 40 MHz, 80 MHz, 160 MHz, and optionally 80+80 MHz non-contiguous bonding. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 160 MHz channel width influence physical rates?** It doubles the throughput compared to 80 MHz channels, reaching peak data rates near 9.6 Gbps. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ax physical rate support uplink multi-user?** Yes, uplink OFDMA and MU-MIMO improve network efficiency by allowing multiple clients to transmit simultaneously. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the minimum physical rate in 802.11ax?** Around 0.3 Mbps using BPSK with a low coding rate, suitable for weak signal conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11ax handle interference affecting rates?** Uses spatial reuse and enhanced coding to maintain reliable connections at higher rates despite interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are physical rates backward compatible in 802.11ax?** Yes, it supports legacy rates for interoperability with older Wi-Fi devices. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Where can I find detailed 802.11ax physical rates tables?** In the IEEE 802.11ax standard documentation and Wi-Fi Alliance technical resources. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`physical_rates in 802.11ax ` * :ref:`Reference links ` .. _physical_rates_step4: .. tab-set:: .. tab-item:: physical_rates in 802.11ax =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== Modulation BW Tsc FSP=BW/Tsc Tdata=1/FSP GI (ns) Symbol (ns) 1/Symbol Bits/Symbol Code rate Usable sc Rate (Mbps) =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== BPSK 20 256 78.125 12.8 800 13.6 0.0735 1 1/2 234 7.8 BPSK 20 256 78.125 12.8 400 13.2 0.0758 1 3/4 234 11.7 QPSK 20 256 78.125 12.8 800 13.6 0.0735 2 1/2 234 15.6 QPSK 20 256 78.125 12.8 400 13.2 0.0758 2 3/4 234 23.4 16-QAM 20 256 78.125 12.8 800 13.6 0.0735 4 1/2 234 31.2 16-QAM 20 256 78.125 12.8 400 13.2 0.0758 4 3/4 234 46.8 64-QAM 20 256 78.125 12.8 800 13.6 0.0735 6 2/3 234 41.6 64-QAM 20 256 78.125 12.8 400 13.2 0.0758 6 3/4 234 46.8 256-QAM 20 256 78.125 12.8 800 13.6 0.0735 8 3/4 234 62.4 256-QAM 20 256 78.125 12.8 400 13.2 0.0758 8 5/6 234 78.0 1024-QAM 20 256 78.125 12.8 800 13.6 0.0735 10 3/4 234 78.0 1024-QAM 20 256 78.125 12.8 400 13.2 0.0758 10 5/6 234 97.5 BPSK 40 512 78.125 12.8 800 13.6 0.0735 1 1/2 468 15.6 BPSK 40 512 78.125 12.8 400 13.2 0.0758 1 3/4 468 23.4 QPSK 40 512 78.125 12.8 800 13.6 0.0735 2 1/2 468 31.2 QPSK 40 512 78.125 12.8 400 13.2 0.0758 2 3/4 468 46.8 16-QAM 40 512 78.125 12.8 800 13.6 0.0735 4 1/2 468 62.4 16-QAM 40 512 78.125 12.8 400 13.2 0.0758 4 3/4 468 93.6 64-QAM 40 512 78.125 12.8 800 13.6 0.0735 6 2/3 468 83.2 64-QAM 40 512 78.125 12.8 400 13.2 0.0758 6 3/4 468 93.6 256-QAM 40 512 78.125 12.8 800 13.6 0.0735 8 3/4 468 124.8 256-QAM 40 512 78.125 12.8 400 13.2 0.0758 8 5/6 468 156.0 1024-QAM 40 512 78.125 12.8 800 13.6 0.0735 10 3/4 468 156.0 1024-QAM 40 512 78.125 12.8 400 13.2 0.0758 10 5/6 468 195.0 BPSK 80 1024 78.125 12.8 800 13.6 0.0735 1 1/2 980 32.7 BPSK 80 1024 78.125 12.8 400 13.2 0.0758 1 3/4 980 49.1 QPSK 80 1024 78.125 12.8 800 13.6 0.0735 2 1/2 980 65.4 QPSK 80 1024 78.125 12.8 400 13.2 0.0758 2 3/4 980 98.1 16-QAM 80 1024 78.125 12.8 800 13.6 0.0735 4 1/2 980 130.8 16-QAM 80 1024 78.125 12.8 400 13.2 0.0758 4 3/4 980 196.2 64-QAM 80 1024 78.125 12.8 800 13.6 0.0735 6 2/3 980 174.5 64-QAM 80 1024 78.125 12.8 400 13.2 0.0758 6 3/4 980 196.2 256-QAM 80 1024 78.125 12.8 800 13.6 0.0735 8 3/4 980 261.6 256-QAM 80 1024 78.125 12.8 400 13.2 0.0758 8 5/6 980 326.9 1024-QAM 80 1024 78.125 12.8 800 13.6 0.0735 10 3/4 980 326.9 1024-QAM 80 1024 78.125 12.8 400 13.2 0.0758 10 5/6 980 408.6 BPSK 160 2048 78.125 12.8 800 13.6 0.0735 1 1/2 1960 65.4 BPSK 160 2048 78.125 12.8 400 13.2 0.0758 1 3/4 1960 98.1 QPSK 160 2048 78.125 12.8 800 13.6 0.0735 2 1/2 1960 130.8 QPSK 160 2048 78.125 12.8 400 13.2 0.0758 2 3/4 1960 196.2 16-QAM 160 2048 78.125 12.8 800 13.6 0.0735 4 1/2 1960 261.6 16-QAM 160 2048 78.125 12.8 400 13.2 0.0758 4 3/4 1960 392.4 64-QAM 160 2048 78.125 12.8 800 13.6 0.0735 6 2/3 1960 349.0 64-QAM 160 2048 78.125 12.8 400 13.2 0.0758 6 3/4 1960 392.4 256-QAM 160 2048 78.125 12.8 800 13.6 0.0735 8 3/4 1960 523.2 256-QAM 160 2048 78.125 12.8 400 13.2 0.0758 8 5/6 1960 653.8 1024-QAM 160 2048 78.125 12.8 800 13.6 0.0735 10 3/4 1960 653.8 1024-QAM 160 2048 78.125 12.8 400 13.2 0.0758 10 5/6 1960 817.2 =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== .. _physical_rates_step17: .. tab-set:: .. tab-item:: Reference links * Reference links