A MAC protocol with power control for DS-UWB communication system

This paper studies a concurrent transmissions MAC (CT-MAC) protocol with power control and improves the best value of collision domain to make it more suitable for direct sequence ultra-wideband (DS-UWB) system. CT-MAC protocol realizes multi-channel transmission by identifying users with different spreading codes. In CT-MAC protocol, nodes of network calculate collision domain each time when they receive packets. The range of collision domain will decrease when bandwidth increases, therefore, when CT-MAC protocol is used in UWB communication, the number of concurrent nodes becomes large and the network will have a better performance. Energy problem is the common problem of physical layer and MAC layer. Therefore, this paper gives a power saving scheme of the MAC layer to determine the sending power of DATA and ACK packets to reduce the power consumption of network by the information exchange in RTS and CTS control packets between two communicating nodes.