Space–time code: Difference between revisions

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STC may be further subdivided according to whether the receiver knows the [[channel (communications)|channel]] impairments. In coherent STC, the receiver knows the channel impairments through training or some other form of estimation. These codes have been studied more widely because they are less complex than their non-coherent counterparts. In noncoherent STC the receiver does not know the channel impairments but knows the statistics of the channel.<ref name="hm">{{cite journal|author=Marzetta, T.L. and Hochwald, B.M.|title=Capacity of a mobile multiple-antenna communication link in Rayleigh flat fading|journal=IEEE Transactions of Information Theory|date=January 1999|volume=45|issue=1|pages=139–157|id={{doi|10.1109/18.746779}}}}</ref> In [[differential space–time code]]s neither the channel nor the statistics of the channel are available.<ref name="jsac">{{cite journal|author=V. Tarokh and [[Hamid Jafarkhani|H. Jafarkhani]]|title=A Differential Detection Scheme for Transmit Diversity|journal=IEEE Journal on Selected Areas in Communications|date=July 2000|Page=1169&ndash;1174|volume=18|issue=7|id={{doi|10.1109/49.857917}} }}</ref>

== See also ==

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* [[Diversity scheme]] &mdash; the concept from which STC arose.

* [[MIMO Communications]] &mdash; the term for a wireless communication system employing multiple antennas at both transmit and receive.