Noise and channel estimation using low spreading factors

摘要

A noise measurement method comprises determining that a short-spreading-factor code is unoccupied, wherein the short-spreading-factor code has a short spreading factor that is less than a longest spreading factor of an occupied longest-spreading-factor code. First and second symbol energies are measured based on the short-spreading-factor code during different time periods within a longest-spreading-factor time period. A noise estimate is generated based on a difference between the measured symbol energies.