Doubling the channel width increases the noise floor because the receiver is now listening over a wider range of frequencies, which can include more interference sources. This results in a decrease in SNR (Signal-to-Noise Ratio), which can negatively impact performance, especially in high-density deployments.
From CWDP-305:
“Channel bonding increases the bandwidth but also increases the amount of noise received. The increased noise can reduce the effective SNR and result in performance degradation, particularly in congested environments.”
— Reference: CWDP-305 Official Study and Reference Guide, Chapter on ProtocolandSpectrum Analysis
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