Space–time trellis code: Difference between revisions

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In contrast to [[space–time block code]]s (STBCs), they are able to provide both coding gain and diversity gain and have a better [[bit error rate|bit-error rate]] performance. In essence they marry single channel continuous time coding with the signaling protocol being used, and extend that with a multi-antenna framework. However, that also means they are more complex than STBCs to encode and decode; they rely on a [[Viterbi algorithm|Viterbi decoder]] at the receiver where STBCs need only [[linear]] processing. Also, whereas in a single transmitter, single receiver framework the Viterbi algorithm (or one of the sequential decoding algorithms) only has to proceed over a trellis in a single time dimension, in here the optimal decoding also has to take into consideration the number of antennas, leading to an extraneous polynomial complexity term.

STTCs were discovered by [[Vahid Tarokh]] et al. in 1998.<ref name="construction">{{cite journal|author=Vahid Tarokh|author2=Nambi Seshadri|author3=A. R. Calderbank|lastname-authorlist-ampstyle=yesamp|title=Space–time codes for high data rate wireless communication: Performance analysis and code construction|journal=IEEE Transactions on Information Theory|pages=744–765|volume=44|issue=2|date=March 1998|doi=10.1109/18.661517|citeseerx=10.1.1.112.4293}}</ref><ref name="performance">{{cite journal|author=Vahid Tarokh|author2=Ayman Naguib|author3=Nambi Seshadri|author4=A. Robert Calderbank|lastname-authorlist-ampstyle=yesamp|title=Space–time codes for high data rate wireless communication: performance criteria in the presence of channel estimation errors, mobility, and multiple paths|journal=IEEE Transactions on Communications|pages=199–207|volume=47|issue=2|date=February 1999|doi=10.1109/26.752125}}</ref>

==References==