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Abstract: As wireless communication systems look intently to compose the transitionfrom voice communication to interactive Internet data, achieving higher bitrates becomes both increasingly desirable and challenging. Space-time codingSTC is a communications technique for wireless systems that inhabit multipletransmit antennas and single or multiple receive antennas. Space-time codesmake use of advantage of both the spatial diversity provided by multipleantennas and the temporal diversity available with time-varying fading.Space-time codes can be divided into block codes and trellis codes. Space-timetrellis coding merges signal processing at the receiver with coding techniquesappropriate to multiple transmit antennas. The advantages of space-time codesSTC make it extremely remarkable for high-rate wireless applications. InitialSTC research efforts focused on narrowband flat-fading channels. The decodingcomplexity of Space-time turbo codes STTC increases exponentially as a functionof the diversity level and transmission rate. This proposed paper provides anover view on various techniques used for the design of space-time turbo codes.This paper also discusses the techniques handled by researchers to builtencoder and decoder section for multiple transmits and receives antennas. Inaddition the future enhancement gives a general idea for improvement anddevelopment of various codes which will involve implementing viterbi decoderwith soft decoding in a multi-antenna scenario. In addition the space-time codemay be analyzed using some of the available metrics and finally to simulate itfor different receive antenna configurations.



Autor: C. V. Seshaiah, S. Nagarani

Fuente: https://arxiv.org/







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