Title :
Power suppression at the Nyquist frequency for pilot-aided PAM and QAM systems
Author :
Kim, Dae Young ; Feher, Kamilo
Author_Institution :
Dept. of Electron. Eng., Chungham Nat. Univ., Daejeon, South Korea
fDate :
9/1/1989 12:00:00 AM
Abstract :
Two low-redundancy codes for in-band pilot insertion are introduced. KF10 suppresses the baseband PAM and the modulated QAM signal power at the Nyquist frequency so that the dual-pilot tone calibration technique of recent interest can be arranged to convey both a symbol timing and a carrier reference to the receiver. OF00 suppresses the signal power at zero as well as the Nyquist frequency and allows the utilization of a triple-pilot scheme which provides, in addition to a symbol timing, a carrier reference with no 180° phase ambiguity
Keywords :
amplitude modulation; pulse amplitude modulation; Nyquist frequency; PAM; QAM; carrier reference; dual-pilot tone calibration; in-band pilot insertion; low-redundancy codes; phase ambiguity; symbol timing; triple-pilot scheme; Baseband; Calibration; Clocks; DC generators; Encoding; Frequency synchronization; Land mobile radio; Microwave theory and techniques; Quadrature amplitude modulation; Timing;
Journal_Title :
Communications, IEEE Transactions on
