Positioning error correction for DS-CDMA IVC under location oriented PN code allocation scheme

This paper discusses the IVC (Inter Vehicle Communication) system for ITS. DS-SS (Direct Sequence Spread Spectrum) is used for the IVC because it has CDMA (Code Division Multiple Access) capability. However, efficient PN code allocation scheme is a problem to solve because the vehicles communication directly without base stations. In this paper, the location oriented PN code allocation scheme is adopted for the DS-SS IVC system. The influence of the positioning error for the communication performance is evaluated. The improved performance is shown even when the positing error exists in the IVC system. To improve the performance, the positioning error correction scheme is proposed. The distance between the vehicles are estimated by using the received signal strength after de-spreading. From the simulation result, the positioning error can be mitigated by using the proposed technique.