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A novel inter-frame coding approach to the problem of varying channel-state conditions in broadcast wireless communication is developed in this paper; this problem causes the appropriate code-rate to vary across different transmitted frames and different receivers as well. The main aspect of the proposed approach is that it incorporates an iterative… (More)
Raptor codes are a class of concatenated codes composed of a fixed-rate precode and a Luby-transform (LT) code that can be used as rateless error-correcting codes over communication channels. These codes have the atypical features of dynamic code-rate, highly irregular Tanner graph check-degree distribution, random LT-code structure, and LT-precode… (More)
In this paper, we propose a timeslot allocation scheme in all-optical TDM networks with no traffic buffering. The purpose of the new scheme is to take the blocking rate to an optimal level close to what can be achieved with the use of buffers. Previous works considered the first fit and least loaded approaches to reserve timeslots in networks that include… (More)
—A family of architecture-aware Raptor codes is constructed. The proposed construction scheme is targeted to design rate-compatible structured codes that span a wide range of rates and block sizes while still having hardware-efficient decoder implementations.
Decoder architectures for architecture-aware Raptor codes having regular message access-and-processing patterns are presented. Raptor codes are a class of concatenated codes composed of a fixed-rate precode and a Luby-Transform (LT) code that can be used as rate-less error-correcting codes over communication channels. In the proposed approach, the decoding… (More)
A Raptor code is a concatenation of a fixed rate precode and a Luby-Transform (LT) code that can be used as a rateless error-correcting code over communication channels. By definition, Raptor codes are characterized by irregularity features such as dynamic rate, check-degree variability, and joint coding, which make the design of hardware-efficient decoders… (More)