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Codebook
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==Data compression== Codebooks were also used in 19th- and 20th-century [[Commercial code (communications)|commercial codes]] for the non-cryptographic purpose of data compression. Codebooks are used in relation to [[precoding]] and [[beamforming]] in mobile networks such as [[5G]] and [[LTE (telecommunication)|LTE]]. The usage is standardized by [[3GPP]], for example in the document [https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3197 TS 38.331], NR; Radio Resource Control (RRC); Protocol specification.
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