Title :
A simple method to estimate carrier leakage with carrier frequency error
Author :
Nakada, J. ; Tajiri, S.
Author_Institution :
Advantest Corp., Saitama, Japan
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
Keywords :
cellular radio; digital communication; fault diagnosis; quadrature phase shift keying; radiotelephony; DQPSK modulated signal; IQ origin offset; carrier frequency error; carrier leakage; digital cellular telephone; digitally modulated signals; isosceles triangle; modulation accuracy; Crosstalk; Digital modulation; Frequency estimation; Frequency modulation; Oscillators; Performance evaluation; Phase modulation; Signal generators; Telephony; Transmitters;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE
Conference_Location :
Hamamatsu
Print_ISBN :
0-7803-1880-3
DOI :
10.1109/IMTC.1994.352157
