Title :
Numerical evaluation of QAM self-noise spectra for fourth-power law clock recovery
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Taiwan
Abstract :
A method for numerically evaluating the self-noise spectra for fourth-power law clock recovery for a quadrature amplitude modulation (QAM) receiver is described. Numerical values are obtained for quadrature phase shift keying (QPSK), 16 QAM, 64 QAM, and 256 QAM systems. Two conclusions are drawn from these results: (1) the quadrature spectrum manifests a dip at the zero frequency for the QPSK case only, and (2) the ratio of the inphase or quadrature self-noise power to the power of the desired recovered clock is not a monotonic function of the excess bandwidth factor. However, the zero excess bandwidth factor is close to the best choice for all orders of QAM modulation
Keywords :
amplitude modulation; noise; phase shift keying; spectral analysis; 16 QAM; 256 QAM; 64 QAM; QAM modulation; QAM receiver; QPSK; excess bandwidth factor; fourth-power law clock recovery; numerical evaluation; quadrature amplitude modulation; quadrature phase shift keying; self-noise spectra; Bandwidth; Circuits; Clocks; Frequency; Phase modulation; Pulse modulation; Quadrature amplitude modulation; Quadrature phase shift keying; Signal generators; Timing jitter;
Conference_Titel :
Communications, 1992. ICC '92, Conference record, SUPERCOMM/ICC '92, Discovering a New World of Communications., IEEE International Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-0599-X
DOI :
10.1109/ICC.1992.268114
