Title :
Coding for spectral shaping
Author :
Waldman, Helio ; Pingarilho, Carlos A M
Author_Institution :
Univ. Estadual de Campinas, Sao Paulo, Brazil
fDate :
28 Nov- 2 Dec 1994
Abstract :
A finite-state constraint is proposed for the construction of binary codes that generate wide suppression regions in the spectrum of PAM signals. The (d,N)-constraint requires that all substrings with length N of the constrained sequence have disparity magnitude not larger than d. The Shannon capacity and number of states of the constrained systems are investigated. Enhanced constraints are suggested for the purpose of reinforcing the spectral features, and their effectiveness is discussed. Sliding-block codes are obtained for certain parameter values, and their spectra are calculated for some examples
Keywords :
binary sequences; block codes; channel capacity; pulse amplitude modulation; spectral analysis; PAM signals; Shannon capacity; binary codes; constrained sequence; constrained systems; disparity magnitude; finite-state constraint; parameter values; sliding-block codes; spectral features; spectral shaping; wide suppression regions; Binary sequences; Eigenvalues and eigenfunctions;
Conference_Titel :
Global Telecommunications Conference, 1994. Communications Theory Mini-Conference Record, 1994 IEEE GLOBECOM., IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-1820-X
DOI :
10.1109/CTMC.1994.512591
