Method and apparatus for signal to noise power ratio estimation in a multi sub-channel CDMA receiver

摘要

The present invention provides a method and apparatus for regulating the transmission power of a transmitter generating a CDMA signal. The CDMA signal is transported over a main channel which includes a plurality of sub-channels, each sub-channel associated with a particular sub-signal of the CDMA signal. The apparatus includes primarily an SNR estimator functional bloc and a logical functional bloc. The SNR estimator functional block receives as input the sub-signals and is responsible for commuting an estimate of the ratio of the total signal energy in the sub-signals to the total noise energy in the sub-signals. The logical functional bloc generates a control signal in dependence of the SNR estimation computed by the SNR estimation functional bloc. This control signal is sent back to the transmitter generating the CDMA signal, and is indicative of either a power-up or power-down command for regulating the transmission power of the transmitter.