A TCM { based Unequal Error Protection Scheme for Intelligent Communication

| Unequal error protection codes that are designed using trellis coded modulation are proposed for use with intelligent communication systems, where the transmitted data consists of a random mixture of important and less important information. To achieve unequal error protection, the proposed scheme encodes the data by randomly switching between two codes which use di erent signal constellations. No extra information about which code was used is added. The receiver decides which code was used by examining the received signal points. Using simple trellis codes, it is shown that the error rate of the important information can be made lower than the error rate for an equivalent equal error protection scheme.