中文摘要：

针对基于TDMA和CDMA机制设计的无线传感器网络MAC协议的不足，给出一种改进的MAC协议方案。该协议方案为网内每个无线传感器节点分配具有正交性的唯一高速伪随机地址码，然后节点将需传送的数据用高速伪随机地址码和载波进行调制并发送至各节点，链路利用率提高，有效避免了数据传输时引起的冲突。基于NS2搭建试验床实验表明：该改进方案提高了网络的数据吞吐量，是TDMA协议的1．33倍．CDMA协议的1．14倍。

英文摘要：

Based on the deficiencies of MAC protocol for wireless sensor network which is designed by TDMA and CDMA,a kind of improved MAC protocol scheme is proposed.The protocol allocates a unique high-speed pseudo-random code with orthogonal for each node of wireless sensor in the network.Then,the data are transmitted by a high-speed pseudo-random code and a carrier wave which will be sent to each node.The improvement of link utilization effectively avoids the conflicts caused by data transmission.The experiment that based on NS2 test bed shows that the improved scheme improves the data throughput of network.It is 1.33 times of the TDMA protocol and 1.14 times of CDMA