A simple medium access scheme based on spread spectrum suitable for wireless Ad hoc networks

Abstract

We propose a simple medium access scheme for wireless ad hoc network (WAHN). The proposed method is based on the spread spectrum (SS) technique to take advantage of the robustness against fading and differentiation of signals. However, conventionally, SS needed a mechanism to allocate a unique spreading code to each node. Since WHAN does not include base stations, this problem must be solved. In this paper, we solve this problem by let each node share a unique code and use it after expanding the chip duration. Although this proposed scheme decreases the data rate if the node expands widely the chip duration, it is better than CSMA. The performance is verified through computer simulations.