Institute of Electrical & Electronic Engineers
In 2nd generation Digital Video Broadcasting (DVB) systems, Low-Density Parity-Check Codes (LDPCCs) are applied. In this paper, the authors propose an extension of the standardized LDPCCs to allow for additional Incremental Redundancy (IR). Several use-cases of IR in broadcasting systems are outlined. They derive an algorithm to extend a given LDPCC with optimized degree sequences. The extended LDPCC yields both original codeword and additional IR. They suggest to transmit IR part at later instances as the standard LDPC code-words. If the receiver fails to decode the standard LDPCC, it can use in addition the IR part. In all other cases, the receiver can fall into sleep mode during transmission of IR, allowing for power saving.