Telecom ABC - S
Spectrum underlay technique is a spectrum management principle by which signals with a very low spectral power density can coexist, as a secondary user, with the primary users of the frequency band(s).
The primary users deploy systems with a much higher power density level. The underlay leads to a modest increase of the noise floor for these primary users.
Ultra Wide Band (UWB) and other spread spectrum technologies can use a spectrum underlay.
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