NOISE AND CHANNEL ESTIMATION USING LOW SPREADING FACTORS

摘要

Noise measurements are made within a fraction of a single symbol period of a longest orthogonal code symbol. A control processor (520) identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader (512) measures symbol energy based on the unoccupied code and a noise estimator (516) generates noise estimations based on the measured symbol energies. The subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code.