METHOD AND A SYSTEM FOR A RECEIVER DESIGN IN BANDWIDTH CONSTRAINED COMMUNICATION SYSTEMS

摘要

The present invention relates to a method of improving the performance in bandwidth constrained communication systems while reducing the complexity of the equalizer used for information retrieval, as well as to improving the capacity of communication systems. The said properties are achieved by appropriate information encoding, prior to signal shaping before transmission, whereas the equalizer complexity is reduced by applying the intersymbol interference shortening filter prior to the information retrieving equalization. A proper combination of the recounted elements is capable of providing a qualitatively improved and previously unsuspected performance, as compared to its constituent elements.

主权项

1. An apparatus comprising a transmitter which contains a plurality of elements including:
(a) an error control code encoder used to append redundant information so as to avail information symbols' retrieval in the presence of noise and impairments, wherein the code is designed for attainment of performance closer to the constrained bandwidth channel capacity; and (b) a receiver comprising a plurality of elements conducive to the retrieval of the transmitted information symbols, including an information retrieving equalizer and an error control decoder for the code employed in the transmitter;wherein the apparatus is for use in a digital communication system conveying information symbols at a certain symbol rate in which the information bearing waveforms are filtered to a bandwidth significantly narrower than the communication symbol rate; andwherein the apparatus achieves an improved performance and/or an increased efficiency in information transmission in a bandwidth-constrained communication system as compared with systems not employing the bandwidth constraint.