FLEXIBLE METHOD OF ERROR PROTECTION IN COMMUNICATIONS SYSTEMS

摘要

A flexible method of error coding uses at least two generating polynomials to provide different degrees of error protection and to optionally superimpose a phantom channel on a primary channel, without the need for explicit signaling from transmitter to receiver. An encoded message is CRC decoded the on the receive side with at least two different generating polynomials. Based on the results of the twin decoding, the present method can determine which of the generating polynomials was used to encode the message and respond accordingly. For instance, if the/a particular generating polynomial was used, then this may be used to indicate that a second channel has been superimposed onto the primary channel and that second channel may be extracted. The method may optionally be refined by adding additional steps to resolve potential ambiguities resulting from the use of a twin decoding scheme.