Differential distributed space-time coding with imperfect synchronization

Differential distributed space-time coding (D-DSTC) has been considered to improve both diversity and data-rate in cooperative communications in the absence of channel information. However, conventionally, it is assumed that relays are perfectly synchronized in the symbol level. In practice, this as...

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Vydáno v:Globecom (2003) s. 3186 - 3191
Hlavní autoři: Avendi, M. R., Poorkasmaei, Sina, Jafarkhani, Hamid
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.12.2014
Témata:
Decoding
differential encoding and decoding
Distributed space-time coding
Encoding
Noise
OFDM
relay networks
Relay networks (telecommunications)
Synchronization
synchronization error
ISSN:1930-529X
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Shrnutí:Differential distributed space-time coding (D-DSTC) has been considered to improve both diversity and data-rate in cooperative communications in the absence of channel information. However, conventionally, it is assumed that relays are perfectly synchronized in the symbol level. In practice, this assumption is easily violated due to the distributed nature of the relay networks. This paper proposes a new differential encoding and decoding process for D-DSTC systems with two relays. The proposed method is robust against synchronization errors and does not require any channel information at the destination. Moreover, the maximum possible diversity and symbol-by-symbol decoding are attained. Simulation results are provided to show the performance of the proposed method for various synchronization errors and the fact that our algorithm is not sensitive to synchronization error.
ISSN:1930-529X
DOI:10.1109/GLOCOM.2014.7037296