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For Orthogonal Frequency-Division Multiplexing (OFDM) based wireless systems, a Resource Block (RB) in a two-dimensional time-frequency plane is defined as a data block spanned by a number of consecutive OFDM symbols over a number of consecutive sub-carriers. Traditionally, RBs contain modulation symbols for data transmission and pilot symbols for channel estimation. In this paper, the authors present a novel approach to RB designs for OFDM systems with multiple antennas at the transmitter and the receiver (i.e., MIMO-OFDM). The proposed approach, termed resource block embedding, does not require explicit pilot symbols to estimate the channel at the receiver, and hence reduces the channel estimation overhead significantly.
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