TY - GEN
T1 - Decision-directed carrier phase and symbol timing recovery for LDPC-coded systems
AU - Wang, Hua
AU - Wu, Nan
AU - Kuang, Jingming
AU - Yan, Chaoxing
PY - 2010
Y1 - 2010
N2 - In this paper, we consider the effect of different rules of symbol decision on the performance of decision-directed synchronizers for LDPC-coded systems. Different from the conventional hard symbol decision based on the Maximum-A-Posteriori (MAP) criterion, soft symbol decision can be considered as the Minimum-Mean-Square-Error (MMSE) estimation of the transmitted symbol. By whether or not the coding constraints are taken into account, soft symbol decision is derived in non-code-aided (NCA) mode and code-aided (CA) mode, respectively. The performance of the soft decision-directed (SDD) synchronizer is compared with that of the hard decision-directed (HDD) counterpart in both NCA and CA mode. Simulation results show that, without much implementation complexity increase, the jitter performance of the synchronizer in CA mode significantly outperforms that in NCA mode. It is also observed that, in the scenario of this paper, SDD synchronizer works only slightly better than HDD synchronizer.
AB - In this paper, we consider the effect of different rules of symbol decision on the performance of decision-directed synchronizers for LDPC-coded systems. Different from the conventional hard symbol decision based on the Maximum-A-Posteriori (MAP) criterion, soft symbol decision can be considered as the Minimum-Mean-Square-Error (MMSE) estimation of the transmitted symbol. By whether or not the coding constraints are taken into account, soft symbol decision is derived in non-code-aided (NCA) mode and code-aided (CA) mode, respectively. The performance of the soft decision-directed (SDD) synchronizer is compared with that of the hard decision-directed (HDD) counterpart in both NCA and CA mode. Simulation results show that, without much implementation complexity increase, the jitter performance of the synchronizer in CA mode significantly outperforms that in NCA mode. It is also observed that, in the scenario of this paper, SDD synchronizer works only slightly better than HDD synchronizer.
KW - Carrier phase recovery
KW - Code-aided
KW - Decision-directed
KW - LDPC-coded system
KW - Symbol timing recovery
UR - http://www.scopus.com/inward/record.url?scp=78649440643&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2010.5594466
DO - 10.1109/VETECF.2010.5594466
M3 - Conference contribution
AN - SCOPUS:78649440643
SN - 9781424435746
T3 - IEEE Vehicular Technology Conference
BT - 2010 IEEE 72nd Vehicular Technology Conference Fall, VTC2010-Fall - Proceedings
T2 - 2010 IEEE 72nd Vehicular Technology Conference Fall, VTC2010-Fall
Y2 - 6 September 2010 through 9 September 2010
ER -