Reduction of Intersymbol Interference in DS-CDMA IVC Based on Location-Oriented Code Allocation

Abstract

In an inter-vihicle communication (IVC) system using OFDM (Orthogonal Frequency Division Multiplexing) modulation and a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) scheme as a MAC (Media Access Control) protocol, the performance is degraded by hidden terminals. IVC using DS-CDMA (Direct Spread-Code Division Multiple Access) has been researched to remedy this problem. However, when this method is applied, there is a concern about the degradation of communication characteristics due to intersymbol interference. This intersymbol interference is divided into two types: (1) different intersymbol interference and (2) same intersymbol interference. In this paper, it is shown that each interference can be reduced by using two proposed methods, improving the communication characteristics.