TY - GEN
T1 - LDPC-coded HARQ throughput performance of MC-CDMA using ICI cancellation
AU - Fukuda, Kaoru
AU - Nakajima, Akinori
AU - Adachi, Fumiyuki
PY - 2007
Y1 - 2007
N2 - Broadband packet data services are demanded in the next generation mobile communications systems. Multi-carrier CDMA (MC-CDMA) is considered to be a promising wireless technique. Hybrid ARQ (HARQ) is a powerful error control technique. It is known that the HARQ throughput performance of MC-CDMA degrades due to the residual inter-code interference (ICI) after frequency-domain equalization (FDE). The use of frequency-domain soft interference cancellation (FDSIC) technique can reduce the residual ICI and improve the throughput performance. An important technical problem is the generation of accurate residual ICI replica for FDSIC. In this paper, we consider low-density parity-check coded (LDPC-coded) MC-CDMA HARQ and generate the residual ICI replica from a-posteriori log-likelihood ratio (LLR) obtained by the LDPC decoder. We evaluate, by computer simulation, the throughput performance in a frequency-selective Rayleigh fading channel. We show that if the residual ICI is removed, MC-CDMA can provide better throughput performance than orthogonal frequency division multiplexing (OFDM).
AB - Broadband packet data services are demanded in the next generation mobile communications systems. Multi-carrier CDMA (MC-CDMA) is considered to be a promising wireless technique. Hybrid ARQ (HARQ) is a powerful error control technique. It is known that the HARQ throughput performance of MC-CDMA degrades due to the residual inter-code interference (ICI) after frequency-domain equalization (FDE). The use of frequency-domain soft interference cancellation (FDSIC) technique can reduce the residual ICI and improve the throughput performance. An important technical problem is the generation of accurate residual ICI replica for FDSIC. In this paper, we consider low-density parity-check coded (LDPC-coded) MC-CDMA HARQ and generate the residual ICI replica from a-posteriori log-likelihood ratio (LLR) obtained by the LDPC decoder. We evaluate, by computer simulation, the throughput performance in a frequency-selective Rayleigh fading channel. We show that if the residual ICI is removed, MC-CDMA can provide better throughput performance than orthogonal frequency division multiplexing (OFDM).
KW - ICI cancellation
KW - LDPC coding
KW - MC-CDMA
UR - http://www.scopus.com/inward/record.url?scp=47649100958&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=47649100958&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2007.210
DO - 10.1109/VETECF.2007.210
M3 - Conference contribution
AN - SCOPUS:47649100958
SN - 1424402646
SN - 9781424402649
T3 - IEEE Vehicular Technology Conference
SP - 965
EP - 969
BT - 2007 IEEE 66th Vehicular Technology Conference, VTC 2007-Fall
T2 - 2007 IEEE 66th Vehicular Technology Conference, VTC 2007-Fall
Y2 - 30 September 2007 through 3 October 2007
ER -