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In OFDM system, with fixed Cyclic Prefix (CP) length, Inter Block Interference (IBI) and inter carrier interference will be present if the Channel Impulse Response (CIR) is larger than the CP length. This problem can be mitigated by design a time domain filter at the receiver, which can shorten or shape the effective CIR to become less than the CP length. This paper proposes a novel method to design a Channel Shortening Prefilter (CSP) for MIMO-OFDM systems, by defining a measurement model which has an underdetermined set of equations. This model is always applicable when the number of transmit antennas (actually transmit streams) is less than the number of receive antennas.
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