How do I design the RF front end for a tri-band Wi-Fi 7 access point?

How do I design the RF front end for a tri-band Wi-Fi 7 access point covering 2.4, 5, and 6 GHz bands? A Wi-Fi 7 access point (AP) requires three independent RF chains for Multi-Link Operation (MLO), each covering a different band with full MIMO capability: (1) Architecture per band: each band has: N spatial streams (typically 4×4 MIMO for enterprise, 2×2 for consumer). Each stream has: PA, LNA, T/R switch, and bandpass filter. Total RF chains: 4 streams × 3 bands = 12 chains (for a 4×4 tri-band AP). (2) 2.4 GHz band (2.400-2.4835 GHz): bandwidth: 83.5 MHz (only supports 20/40 MHz channels). PA: CMOS or GaAs, Pout = 18-22 dBm per chain, PAE > 30%. LNA: NF < 2.5 dB. Filter: SAW or LC filter (wide passband, low loss). Challenge: this band is heavily congested (Wi-Fi, Bluetooth, Zigbee, microwave ovens). Coexistence filtering is critical. (3) 5 GHz band (5.150-5.850 GHz, with gaps): bandwidth: 700 MHz (supports 20/40/80/160 MHz channels). PA: GaAs HBT, Pout = 18-22 dBm, PAE > 25%. LNA: NF < 2.0 dB. Filter: BAW or LC filter. Must comply with DFS (Dynamic Frequency Selection) requirements for radar coexistence in the 5.25-5.35 and 5.47-5.725 GHz bands. (4) 6 GHz band (5.925-7.125 GHz): bandwidth: 1200 MHz (supports 20/40/80/160/320 MHz channels). PA: GaAs HBT, Pout = 18-22 dBm, PAE > 20% (lower PAE due to higher frequency). Must support 320 MHz bandwidth with EVM ≤ 1.8% for 4096QAM. LNA: NF < 2.0 dB, gain > 15 dB. Filter: BAW or IPD (Integrated Passive Device) filter. (5) Front-End Module (FEM): modern Wi-Fi APs use integrated FEMs that combine the PA, LNA, T/R switch, and sometimes the filter in a single package. Major FEM suppliers: Skyworks (SKY85797), Qorvo (QPF4656), Broadcom (AFEM-S10). Each FEM handles one stream for one band. A 4×4 tri-band AP uses 12 FEMs.