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Estimation of signal to noise ratio for the received signal is an important task in communication systems. The knowledge of the SNR is a requirement on many systems in order to perform efficient signal detection and link adaptation. In adaptive modulation system we need a way to decide which modulation level is best suited for the present channel condition, in this paper we decided to use the estimated SNR of the link as a channel metric to decide the switching levels. The channel estimation using two digital modulation technique (QAM and QPSK) are considered in W-CDMA environment, as we increase the range of communication, we step down to lower modulation (QPSK) but as we reduce the communication range means we are closer to the base station; we can utilize higher order modulation (QAM) for increase in throughput thus allowing the system to overcome multipath fading and other interferences. The results shows that the values of signal to noise ratio (SNR) from 10-12dB, the modulation scheme that yielded the desired BER of 10-3 is QPSK modulation technique while SNR values greater than 18dB, QAM modulation technique can be used doubling the capacity compared with QPSK modulation techniqu

SIGNAL TO NOISE RATIO ESTIMATION OF QAM AND QPSK MODULATION TECHNIQUE AT 910MHz AND 2116.4 MHz USING MEASURED DATA