Theory 044/Networks & Telecommunications
Spectrum Efficiency Is Correlation
The claim
Achievable spectral efficiency is set by the correlation of interference across antennas rather than by signal-to-noise ratio.
01The mechanism
Correlated interference occupies a subspace and cannot be nulled; uncorrelated interference can be separated spatially.
02Predictions
- P1Efficiency should fall as interference correlation rises.
- P2Adding antennas should not help beyond a point.
03Refutation
Efficiency tracking SNR alone would remove the correlation term.