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In computer science, Raptor codes (rapid tornado; see Tornado codes) are the first known class of fountain codes with linear time encoding and decoding. They were invented by Amin Shokrollahi in 2000/2001 and were first published in 2004 as an extended abstract. Raptor codes are a significant theoretical and practical improvement over LT codes, which were the first practical class of fountain codes.
Information indications for raptor codes
Methods, systems, and devices for wireless communications are described. An encoding device (e. g., a network entity or user equipment (UE)) may communicate indications of encoded symbol identifiers (ESI), source block numbers (SBN), or both with a decoding device in a downlink control information (DCI). As examples, the indications of the SBN and / or ESIs may be transmitted using either an unused or repurposed field in the downlink control information (DCI) that schedules a transmission that includes the encoded symbols or in a new DCI that piggybacks on a downlink shared channel transmission that includes the encoded symbols. Additionally, or alternatively, in a first option, the ESI may be explicitly indicated by the DCI. In another option, the network entity may indicate a configuration (e. g., via radio resource control messaging) for implicitly determining the ESI based on information conveyed in the DCI.
Owner:QUALCOMM INC