A simple method to estimate carrier leakage with carrier frequency error

Abstract

This paper discusses a new method of estimating the carrier leakage for evaluation of a DQPSK modulated signal. Measured values such as modulation accuracy, carrier frequency error, and IQ origin offset are used in the evaluation of digitally modulated signals. In this new method, the carrier leakage is estimated from two adjacent symbols that form an isosceles triangle. The method is applicable when the transmitted digital data is completely demodulated or when the transmitted data is known. It is available when there is carrier frequency error in a modulated signal.<>