TY - JOUR
T1 - Performance of variable-power adaptive modulation with space-time coding and imperfect CSI in MIMO systems
AU - Yu, Xiangbin
AU - Leung, Shu-Hung
AU - Mow, Wai Ho
AU - Wong, Wai-Kai
PY - 2009/5
Y1 - 2009/5
N2 - The performance analysis of multi-input-multi-output (MIMO) systems with M-ary quadrature amplitude modulation (MQAM) and a space-time block code (STBC) over flat Rayleigh fading channels for imperfect channel state information (CSI) is presented. In this paper, the optimum fading gain switching thresholds for attaining maximum spectrum efficiency (SE) subject to a target bit-error rate (BER) and an average power constraint are derived. It is shown that the Lagrange multiplier in the constrained SE optimization does exist and is unique for imperfect CSI and for single-input-single-output (SISO) systems under perfect CSI. On the other hand, the Lagrange multiplier will be unique if the existence condition for MIMO under perfect CSI is satisfied. Numerical evaluation shows that the variable-power (VP) adaptive modulation (AM) with STBC provides better SE than its constant-power (CP) counterpart. © 2008 IEEE.
AB - The performance analysis of multi-input-multi-output (MIMO) systems with M-ary quadrature amplitude modulation (MQAM) and a space-time block code (STBC) over flat Rayleigh fading channels for imperfect channel state information (CSI) is presented. In this paper, the optimum fading gain switching thresholds for attaining maximum spectrum efficiency (SE) subject to a target bit-error rate (BER) and an average power constraint are derived. It is shown that the Lagrange multiplier in the constrained SE optimization does exist and is unique for imperfect CSI and for single-input-single-output (SISO) systems under perfect CSI. On the other hand, the Lagrange multiplier will be unique if the existence condition for MIMO under perfect CSI is satisfied. Numerical evaluation shows that the variable-power (VP) adaptive modulation (AM) with STBC provides better SE than its constant-power (CP) counterpart. © 2008 IEEE.
KW - Adaptive modulation
KW - Adaptive modulation (AM)
KW - Multi-input multi-output (MIMO) system
KW - Multi-input-multi-output (MIMO) system
KW - Space-time coding
KW - Spectrum efficiency
KW - Spectrum efficiency (SE)
KW - Variable power (VP)
KW - Variable-power
UR - http://www.scopus.com/inward/record.url?scp=66149135692&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-66149135692&origin=recordpage
U2 - 10.1109/TVT.2008.2002543
DO - 10.1109/TVT.2008.2002543
M3 - RGC 21 - Publication in refereed journal
SN - 0018-9545
VL - 58
SP - 2115
EP - 2120
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 4
ER -