Algorithm for exploiting channel time selectivity in pilot-aided MIMO systems

The problem of channel estimation and symbol detection in fast fading channels using multiple antennas is dealt with. This is one of the many challenges faced by extending spatial multiplexing to mobile terminals. A commonly used method of resolving this problem is pilot-aided channel interpolation. An iterative algorithm that substantially improves the performance of pilot-aided MIMO channel interpolation systems is proposed. The algorithm involves alternating projection of parameters onto different sub-spaces so as to exploit the time selectivity of the channel to improve the quality of symbol detection. Simulations have shown that the algorithm, when applied to any interpolation scheme, improves the bit error performance of the system significantly.