Interference Cancellation Using Replica Signal for HTRCI-MIMO/OFDM in Time-Variant Large Delay Spread Longer Than Guard Interval
Orthogonal Frequency Division Multiplexing (OFDM) and Multiple-Input Multiple-Output (MIMO) are generally known as the effective techniques for high data rate services. In MIMO/OFDM systems, the Channel Estimation (CE) is very important to obtain accurate Channel State Information (CSI). However, since the orthogonal pilot-based CE requires the large number of pilot symbols, the total transmission rate is degraded. To mitigate this problem, a High Time Resolution Carrier Interferometry (HTRCI) for MIMO/OFDM has been proposed. In wireless communication systems, if the maximum delay spread is longer than the Guard Interval (GI), the system performance is significantly degraded due to the Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI). However, the conventional HTRCI-MIMO/OFDM does not consider the case with the time-variant large delay spread longer than the GI.