Synchronization Error Correction for Asynchronous Channels Data Transmission

Abstract

Abstract. Loss of synchronization is a common source of errors in asynchronous data channels. Minute differences in the operating frequencies between the transmitter and the receiver result in data bits being lost or false bits being inserted. This paper presents an innovative technique, especially designed for detecting and correcting errors of this type. Data packets are preprocessed and areas that are susceptible to are determined. Suitable redundancy is introduced in the form of control symbols. On the receiver side, similar calculations take place and decisions are made on the occurrence and positions of the transmission errors due to loss of synchronization, which are hence corrected. The proposed method is computationally simple, since it uses a small number of simple mathematical operations, contrary to existing, general purpose techniques. The transmission overheads it imposes do not vary significantly from existing error control codes. Additionally, the number of errors that may be corrected is not subject to the same limits as existing techniques.

Código cíclico bidimensional con propiedad de sincronización para canales con ruido clase A

“…En [11] se construyen códigos de longitud variable que denomina "terminación ordenada" y de acuerdo a los resultados estos tienen muy buena propiedad de sincronización. En [12] se propone segmentar la información. Estos paquetes son pre-procesados y aquellas áreas propensas a sufrir un número mayor de bits erróneos, contienen más redundancia.…”

“…Para que un código cíclico pueda determinar la magnitud y la dirección de B bits de deslizamientos o menor y pueda corregir M bits de ráfaga o menor aún cuando ellos ocurran simultáneamente se debe cumplir, ecuación (12):…”