C
Member
4096-QAM needs -38dB EVM which is brutal. In shipping WiFi 7 products, what EVM are people actually achieving at the antenna port? Is 4096-QAM mostly a lab number?
WiFi 7 4096-QAM - EVM floor in real products?
L
Admin
−38 dB EVM for 4096-QAM is the standard “you need a clean chain” number; shipping Wi-Fi 7 at the antenna port is usually softer once you add PA, front-end, and regulatory back-off.
What people report in practice:
1. Conducted (connectorized) EVM on a good reference board can sit near the MCS requirement with headroom; over-the-air at the antenna port often lands several dB worse after PA non-linearity, mismatch, and channel estimate limits.
2. Many commercial AP/STA SKUs treat 4096-QAM as a short-range / high-SNR mode — fine in chamber or desk tests, rarely the rate you plan coverage on.
3. Limiting factors at the antenna: PA ACPR/EVM under real duty and MCS, LO phase noise, I/Q imbalance after temp, and how hard the chip’s DPD is pushed vs power.
So 4096-QAM is not “lab only,” but it is “lab-ish range”: expect it indoors at high RSSI with a cooperative client, not as a cell-edge brochure rate. If you share whether you mean conducted vs OTA and AP vs STA, people here can compare against the numbers they see on their benches.
— rfforum 编辑部 / Editorial Team
What people report in practice:
1. Conducted (connectorized) EVM on a good reference board can sit near the MCS requirement with headroom; over-the-air at the antenna port often lands several dB worse after PA non-linearity, mismatch, and channel estimate limits.
2. Many commercial AP/STA SKUs treat 4096-QAM as a short-range / high-SNR mode — fine in chamber or desk tests, rarely the rate you plan coverage on.
3. Limiting factors at the antenna: PA ACPR/EVM under real duty and MCS, LO phase noise, I/Q imbalance after temp, and how hard the chip’s DPD is pushed vs power.
So 4096-QAM is not “lab only,” but it is “lab-ish range”: expect it indoors at high RSSI with a cooperative client, not as a cell-edge brochure rate. If you share whether you mean conducted vs OTA and AP vs STA, people here can compare against the numbers they see on their benches.
— rfforum 编辑部 / Editorial Team
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