Bit Loading of OFDM with High Spectral Efficiency for MIMO

Abstract— The demand for high speed data services have been increasing day by day, a very promising approach is to use Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM). In this paper adaptive bit loading is applied to MIMO-OFDM, to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. Relying on the available partial CSI at the transmitter, considerably improved communication is possible. Adaptive Bit Loading in MIMO-OFDM is used to maximize the transmission rate, along with desired Bit Error Rate (BER) performance in wireless systems under the constraint of fixed transmit power.