QIAN Xue-rong, YUE Dian-wu, ZHANG Li-jun. An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels[J]. Acta Electronica Sinica, 2002, 30(4): 508-511.
QIAN Xue-rong, YUE Dian-wu, ZHANG Li-jun. An Adaptive Allocation Algorithm for Multiuser OFDM System over Frequency Selective Fading Channels[J]. Acta Electronica Sinica, 2002, 30(4): 508-511.DOI:
an adaptive allocation algorithm for multiuser Orthogonal Frequency Division Multiplexing (OFDM) system over multipath frequency selective fading channels is proposed.According to the estimation of instantaneous channel characteristics
the adaptive allocation algorithm assigns the subchannels and bits for multiuser in the system to minimize the total transmission power for a given bit error rate (BER).Firstly
we apply the conception of time division multiplexing to the system to propose an optimum subchannel and bit rate allocation algorithm for multiuser
which results a low bound of the transmission power in the system.Then
a suboptimum adaptive allocation algorithm is proposed.The numerical simulation shows that the transmission power determined by the suboptimum adaptive allocation algorithm is 1dB bigger than that of the low bound;3-4dB less than that in equal bit allocation (EBA) and 6-8dB less than that in static subchannel allocation (SSA).