Method for measuring CDMA signal

Abstract

In a measurement of a quality of a CDMA signal diffused by a long code and a short code, the measurement can be performed even if a carrier frequency error is relatively large. A received signal is converted to a complex base band signal s (12) and a symbol point of the signal extracted (33). A frequency error Δf is obtained from a phase slippage from the signal point (34). The signal s is corrected by the Δf and the corrected signal s′ is decoded by a diffusion signal of each channel. Also each power is obtained and each reference signal is created. A delay time τ is obtained from each reference signal and the signal s′ such that a square error ε between them is minimized (37). The signal s′ is corrected by the value τ. Regarding the corrected signal s″ thereof, a frequency error and an initial phase are obtained such that ε is minimized (38). The signal s″ is corrected by those frequency error and initial phase to generate a signal s′″. An amplitude is measured using the signal s′″ and the reference signal and further, a measurement item is calculated (22).

Dependencies are inferred from the claim text.