ICI/ISI Cognizant-Beam Forming Technique for Outdoor WLAN 802.11n
An Orthogonal Frequency Division Multiplexing (OFDM) system suffers poor performance degradation as the channel impulse response is greater than the length of the Cyclic Prefix (CP). The main reason for this performance degradation is the Inter-Carrier Interference (ICI) and Inter-Symbol Interference (ISI). The conventional aware beamforming technique mitigates the ICI/ISI caused due to multipath delay. However, the suppression is very limited. The authors propose an alternative technique, ICI/ISI Cognizant-BeamForming (ICBF) algorithm in which aware beamforming is implemented along with Maximum Likelihood Sequence Equalizer (MLSE) which increases the ICI/ISI mitigation compared to conventional system.