DECODIFICADOR DE DATOS

• Main Author: ALBERTY, THOMAS
• Format: Patent
• Language: Spanish
• Published: 01.11.1999
• Edition: 6
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROCEDIMIENTO PARA PREPARAR SEÑALES DE APOYO (G'' SUB,I}) PARA APOYAR UN DEMODULADOR (DM) MEDIANTE UN DECODIFICADOR (DD), CON LA TRANSMISION CODIFICADA DE BITS DE DATOS (D SUB,K}) POR MEDIO DE UN ALFABETO SIMBOLICO DE CANALES CON M ETAPAS. PARA ACORTAR LOS TIEMPOS DE FUNCIONAMIENTO DE LAS SEÑALES DE APOYO (G'' SUB,I}) REALIMENTADAS DESDE EL DECODIFICADOR DE DATOS (DD) AL DEMODULADOR (DM), ESTAS MUESTRAN UNA INFORMACION LIMITADA, QUE PUEDE LIMITARSE POR EJEMPLO A UNA INFORMACION SOBRE A CUAL DE ENTRE VARIOS GRUPOS DE SIMBOLOS DE CANAL (C'' SUB,I}) PERTENECEN POR ESTIMACION LOS SIMBOLOS DE CANAL (C'' SUB,I}) TRANSFERIDOS O EN QUE GRUPO DE ESTADOS SE ENCUENTRA LA RUTA A TRAVES DEL DIAGRAMA DE TREILLIS PRECISAMENTE POR ESTIMACION. The method of receiving a coded data signal encoded by means of a state transition diagram having a number of states (U, V, W, X) by a receiver, the receiver including a demodulator that generates estimated symbols (c'i) from the data signal and a following data decoder, includes forming a number (N) of groups (a,b) from the states (U, V, W, X) of the state transition diagram; continuously making estimations of probabilities of group membership of a current state of the data decoder (Dd) in the groups (a,b); furnishing the estimations to the demodulator as assisting signals and generating the estimated symbols (c'i) using them. In another embodiment, a number (K) of groups (I,II) are formed from channel symbols of a channel symbol alphabet, estimates of probabilities of group membership of received symbols are continuously made, the estimates are supplied to the demodulator (Dd) as assisting signals and the estimated symbols (c'i) are generated from them.