Equalization of SIMO-OFDM Systems With Insufficient Cyclic Prefix in Doubly Selective Channels

Time variations of a doubly selective wireless channel and insufficient Cyclic Prefix (CP) length of an Orthogonal Frequency Division Multiplexing (OFDM) transmission system cause Inter-Carrier Interference (ICI) and Inter-Block Interference (IBI) as significant limitations. This paper investigates the problem of joint ICI and IBI mitigation in Single-Input Multiple-Output OFDM (SIMO-OFDM) systems. It is assumed, unlike most existing literature, that the channel delay spread is larger than the CP, and also the channel varies on each OFDM block.