Patent ID: 8054872

Claim:
An apparatus for determining a carrier-to-noise power density ratio (CN 0 ) of a spread spectrum signal, comprising: a signal power calculation unit for determining a signal power indicator indicative of a signal to noise ratio of said spread spectrum signal; and a conversion unit coupled to said signal power calculation unit for storing a lookup table representing a relationship between said signal power indicator and said carrier-to-noise power density ratio and for converting said signal power indicator to said carrier-to-noise power density ratio according to said lookup table, wherein said signal power calculation unit comprises: a first accumulator for accumulating an in-phase integration result and a quadrature integration result separately over a time period and for generating an accumulated in-phase integration result and an accumulated quadrature integration result respectively; a first calculation unit coupled to said first accumulator for determining a first evaluation value based on said accumulated in-phase integration result and said accumulated quadrature integration result; a second calculation unit for processing said in-phase integration result and said quadrature integration result; a second accumulator coupled to said second calculation unit for determining a second evaluation value by accumulating an output of said second calculation unit over said time period; and a division unit coupled to said first calculation unit and said second accumulator for determining said signal power indicator based on said first and second evaluation results.