Optimal Training Signals Design for MIMO OFDM Systems with Guard Subcarriers

All existing training signals designs for OFDM systems assume no guard subcarriers. In practice, guard subcarriers exist in almost all the OFDM systems. In this paper, we propose a linear programming (LP) method for optimal power distribution design and a certain matrix for optimal phase design in MIMO OFDM systems with guard subcarriers. Based on these methods, the optimal training signals for 802.11a and 802.16 are derived. Simulation results show that a significant performance improvement can be achieved with the proposed training signals