International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE)
For broadband wireless communication systems, Multi-Input Multi-Output (MIMO) techniques have been incorporated with Orthogonal Frequency Division Multiplexing (OFDM). Beamforming is a Multi-Input Multi-Output (MIMO) technique utilizing the channel knowledge both at the transmitter and the receiver. Multiple beamforming uses more than one sub-channel to improve the capacity. For frequency selective channels, to achieve Inter-Symbol Interference (ISI) and achieve spatial diversity combine beamforming with OFDM. Also by adding channel coding spatial diversity and multipath diversity can be achieved.