Distributed space-time coding, one kind of cooperative communications, uses multiple relays with single antenna to form virtual antenna arrays. By doing so, it acquires spatial diversity and thus improves the system performance. Among them, distributed differential space-time modulation utilizes differential encoding such that the receiver does not need channel coefficients.
In this thesis, we study high-rate differential space-time network coding for multi-source cooperative communication which overcomes the problems of imperfect synchronization and complicated channel estimation. We also study high-rate distributed differential space-time modulation for multi-source cooperative communications, and compare its error performance with differential space-time network coding. According to the simulation results, distributed differential space-time modulation scheme has better error performance than network coding, irrespective of synchronization issue.
Besides, we also compared the non-coherent and coherent scheme, found that distributed space-time coding is about 3db better than non-coherent scheme. The other hand, the performance gap between the space-time network coding and non-coherent scheme is wide.
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