Time Reversal Block Diagonalization for Spatial Multiplexing MIMO-UWB

In the traditional multi-user MIMO, the number of independent sub-channels is associated with the number of receive antennas and the transmit antennas. We propose a method based on time reversed and block diagonalization used for spatial multiplexing MIMO-UWB system. By involving time reversed technology, the joint optimization of pre-and post-coders will be simplified to the problem of optimize one of them (pre-or post-coders). With such an encoder, we can apply eigenvalue decomposition to the channel impulse response matrix, and make it be diagonal to eliminate MSI completely. Consider the optimization of the transmission power allocation associated with the diagonalization mentioned above. We also present a MIMO-UWB system to transmit independent multi-stream. Simulation results show that the MIMO-TR-BD method can improve the system (BER) performance.