TY - GEN
T1 - Distributed space-time block coded OFDM for relay-assisted transmission
AU - Mheidat, Hakam
AU - Uysal, Murat
AU - Al-Dhahir, Naofal
PY - 2006
Y1 - 2006
N2 - In this paper, we investigate orthogonal frequency division multiplexing (OFDM) technique for distributed spacetime block coding (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. We consider the special case of a single-relay where the source-to-relay (S → R), relay-to-destination (R → D) and source-to-destination (S → D) links experience possibly different channel delay spreads. Our analysis demonstrates that uncoded distributed OFDM-STBC (D-OFDM-STBC) scheme achieves a maximum diversity order of two for the considered single-relay scenario since it is able to exploit only the spatial diversity, but not the available rich multipath diversity. We further consider a combination of D-OFDM-STBC and Trellis Coded Modulation (TCM) with frequency-interleaving. Under the assumption of perfect power control for the relay terminal and high signal-to-noise ratio for the underlying links, our performance analysis demonstrates that D-OFDM-STBC scheme with judiciously designed outer TCM codes, i.e. sufficiently large effective code length (ECL), is able to achieve a maximum diversity order of min(L1, L3) + L2 + 2 where L1, L2, and L3 are the channel memory lengths for S → R, S → D and R → D links, respectively. This illustrates that the smaller of the multipath diversity orders experienced in S → R and R → D links becomes the performance bottleneck for the relaying path. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide further insights into the performance.
AB - In this paper, we investigate orthogonal frequency division multiplexing (OFDM) technique for distributed spacetime block coding (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. We consider the special case of a single-relay where the source-to-relay (S → R), relay-to-destination (R → D) and source-to-destination (S → D) links experience possibly different channel delay spreads. Our analysis demonstrates that uncoded distributed OFDM-STBC (D-OFDM-STBC) scheme achieves a maximum diversity order of two for the considered single-relay scenario since it is able to exploit only the spatial diversity, but not the available rich multipath diversity. We further consider a combination of D-OFDM-STBC and Trellis Coded Modulation (TCM) with frequency-interleaving. Under the assumption of perfect power control for the relay terminal and high signal-to-noise ratio for the underlying links, our performance analysis demonstrates that D-OFDM-STBC scheme with judiciously designed outer TCM codes, i.e. sufficiently large effective code length (ECL), is able to achieve a maximum diversity order of min(L1, L3) + L2 + 2 where L1, L2, and L3 are the channel memory lengths for S → R, S → D and R → D links, respectively. This illustrates that the smaller of the multipath diversity orders experienced in S → R and R → D links becomes the performance bottleneck for the relaying path. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide further insights into the performance.
KW - Cooperative diversity
KW - Distributed space-time block coding
KW - Fading channels
KW - OFDM
KW - Pairwise error probability
UR - http://www.scopus.com/inward/record.url?scp=42549160448&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42549160448&partnerID=8YFLogxK
U2 - 10.1109/ICC.2006.255350
DO - 10.1109/ICC.2006.255350
M3 - Conference contribution
AN - SCOPUS:42549160448
SN - 1424403553
SN - 9781424403554
T3 - IEEE International Conference on Communications
SP - 4513
EP - 4519
BT - 2006 IEEE International Conference on Communications, ICC 2006
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2006 IEEE International Conference on Communications, ICC 2006
Y2 - 11 July 2006 through 15 July 2006
ER -