Abstract:
Interference Alignment (IA) based Channel Independent Precoding for SISO OFDM
and MIMO OFDM systems with Insufficient Cyclic Prefix (CP) is proposed that
can remove the Inter-Block Interference (IBI) experienced from the insufficient CP
with bandwidth efficiency higher than the unprecoded (or conventional) OFDM
system with sufficient CP. The BER performance of IA based channel independent
precoding in SISO OFDM and MIMO OFDM has been analyzed in comparison to
conventional OFDM. The proposed precoding technique is much more bandwidth
efficient than the conventional OFDM using the insufficient CP because the IBI
caused by the insufficient CP can be set to a subspace whose dimensions are no
more than a half of the difference of the length of ISI channel and the length of
insufficient CP, so that more information symbols can be sent by using the other
half.
