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Raptor codes may be systematic or non-systematic. In the systematic case, the symbols of the original source block, i.e. the source symbols, are included within the set of encoding symbols. An example of a systematic Raptor code is the code defined by the [[3rd Generation Partnership Project]] for use in [[mobile cellular wireless]] broadcast and multicast and also used by [[DVB-H standard]]s for IP datacast to handheld devices (see external links). The Raptor codes in these standards is defined also in [[IETF]] RFC 5053. The most advanced version of a practical Raptor code is RaptorQ defined in [[IETF]] RFC 6330.
Information about
the RaptorQ code specified in [[IETF]] RFC 6330 (the most advanced fountain code),
can be found at the
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