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Rake receiver
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== History == Rake receivers must have either a general-purpose [[CPU]] or some other form of [[digital signal processing]] hardware in them to process and correlate the intended signal. Rake receivers only became common after 16-bit CPUs capable of signal processing became widely available. The rake receiver was patented in the US by [[Robert Price (engineer)|Robert Price]] and [[Paul Green (engineer)|Paul E. Green]] in July 1956,<ref>{{cite web|title=UMTS / 3G History and Future Milestones|url=http://www.umtsworld.com/umts/history.htm|access-date=12 November 2010}}</ref> (U.S. Pat. No. 2,982,853) but it took until the 1970s to design practical implementations of the receiver. Radio astronomers were the first substantial users of rake receivers in the late 1960s to mid-1980s as this kind of receiver could scan large sky regions yet not create large volumes of data beyond what most data recorders could handle at the time. [[Astropulse]], which is part of the [[SETI@Home]] project, uses a variant of a rake receiver as part of its sky searches—so this kind of receiver is still current for the needs of radio astronomy.
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