Adaptive power loading based on unequal-BER strategy for OFDM systems
IEEE Communications Letters
Computers and Electrical Engineering
Optimum power loading with arbitrary square MQAM for OFDM systems
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
OFDMA downlink resource allocation via ARQ feedback
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
A case for adaptive sub-carrier level power allocation in OFDMA networks
Proceedings of the thirteenth ACM international symposium on Mobile Ad Hoc Networking and Computing
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Optimization of the performance of multicarrier transmission over a linear dispersive channel is presented. The optimum data and power assignment to the subcarriers are derived for both the conventional error probability criterion, and a new criterion based on the normalized mean-square error. The assignments and algorithms hold for channels where performance is degraded by additive noise, intersymbol and interchannel interference. Lower bounds on throughput are derived and are used to compare multicarrier performance with conventional single-carrier quadrature amplitude modulation (QAM) with both linear and decision feedback equalization. It is seen that multicarrier transmission can provide a significant improvement at low and intermediate channel signal-to-noise ratios. As an example, the optimization is applied to the high-speed digital subscriber loop, and multicarrier transmission is demonstrated to be superior to decision feedback equalized single-carrier QAM