Enhancing the Performance of Ad Hoc Wireless Networks Using Code Division

Abstract

The performance of ad hoc wireless network suffers from problems in multi-hop transmission. This study adopts code division to modulate the frame header and the frame payload separately. A common spreading code modulates the frame header, and a special spreading code is negotiated and to modulate the frame payload. A field in the frame header indicates the spreading code used to modulate the successive frame payload. The modulated frame is transparent for every node, enabling many frames to be transmitted simultaneously. To allow the special spreading code negotiation, the RTS/CTS command is modified as ERTS/ECTS, and a spreading code table (SCT) is maintained in every node. Due to the space reuse, the proposed scheme has superior performance in latency and bandwidth utilization, as revealed by the simulation results.