Space–time code: Difference between revisions

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A '''space–time code''' ('''STC''') is a method employed to improve the reliability of data [[transmission (telecommunications)|transmission]] in [[wireless|wireless communication systems]] using multiple transmit [[antenna (radio)|antennas]]. STCs rely on transmitting multiple, [[redundancy (information theory)|redundant]] copies of a data stream to the [[receiver (radio)|receiver]] in the hope that at least some of them may survive the [[transmission medium|physical path]] between transmission and reception in a good enough state to allow reliable decoding.

==Types==

Space time codes may be split into two main types:

*[[Space–time trellis code]]s (STTCs)<ref name="construction">{{cite journal|author1=Vahid Tarokh |author2=Nambi Seshadri |author3=A. R. Calderbank |name-list-style=amp |title=Space&ndash;time codes for high data rate wireless communication: Performance analysis and code construction|journal=IEEE Transactions on Information Theory|pages=744&ndash;765|volume=44|issue=2|date=March 1998|doi=10.1109/18.661517|citeseerx=10.1.1.112.4293 }}</ref> distribute a [[convolutional code|trellis code]] over multiple antennas and multiple time-slots and provide both coding gain and [[diversity reception|diversity gain]].