Interference canseller method using hierarchical OMF against concatenated sequence

Abstract

DS-CDMA is one of schemes suitable for InterVehicle Communication(IVC), but, when DS-CDMA is used, there is avoidable problem, Co-Channel Interference(CCI). OMF(Orthogonalizing Matched Filter) is considered suitable for ITS, because OMF can eliminate interference without knowing spread code of interference wave. However, also OMF has a problem. It is the number of taps in conventional OMF increases depending on spreading code length. So, in this study we propose Hierarchical OMF whichi is placed two OMFs hierarchically. Then, we show that proposal method has less taps than conventional OMF and interference rejection capability as well as conventional OMF.

Hybrid Radio and Visible Light Communications in Inter-Vehicle Communication

“…Then the signal-to-noise-ratio (SNR) and BER of the OOK-based VLC will be [15]. Here, binary phase shift keying (BPSK) modulation is used in CDMA system, so the BER of the radio system can be written as, by Goldsmith (2005) [16]: However, the DSSS in radio systems uses bipolar spreading sequences that cannot be used in the all-positive optical medium.…”