Spread spectrum medium access protocol with collision avoidance using controlled time of arrival

The spread spectrum technique, the collision avoidance multiple access prot ocols and the controlled time of arrival scheme are combined to form a new set of medium access protocols for wireless networks. The Request-to-Send a nd Clear-to-Send message dialogue helps a transmitter detect whether an int ended receiver is busy and whether any collision has occurred; thus speedin g up the retransmission. The spreading code assignment avoids the disruptio n of any ongoing transmission by an intruder. Finally, the packets are sent under controlled time of arrival to further increase the channel throughpu t. Simulation results confirm that a higher channel throughput is achieved by the new protocols even in a dense network.