基于IEEE 802.15.4的低复杂度OQPSK全数字调制方法  

Low-Complexity Full-Digital Method of OQPSK Modulation Based on IEEE 802.15.4

作　　者：刘述钢[1] 刘宏立[1] 詹杰[1] 朱凡[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《传感技术学报》2010年第5期691-695,共5页Chinese Journal of Sensors and Actuators

基　　金：国家高技术研究发展计划("863"计划)基金资助项目资助(2007AA11A121);湖南省科技厅计划项目资助(2008FJ3114)

摘　　要：深入研究IEEE802.15.4协议中经半正弦函数成型的OQPSK调制信号中相邻相位的变化特征,为便于调制算法的全数字电路实现,对基带调制算法进行了数字化处理。同时,本文提出一种循环移位和查找表相结合的方法降低电路复杂度,有效减小了调制器的实现成本。仿真及FPGA综合结果表明:该方法简单易行,逻辑单元数和存储器比特数仅分别为52和72,满足无线传感网络低成本的要求。We deep researched on the adjacent phase characteristics of the OQPSK modulation signals by half-sine shape in IEEE 802.15.4 protocol.The baseband modulation algorithm was digitized in order to facilitate full digital hardware implement of modulation algorithm.At the same time,we proposed an effective method of cyclic shift and looking-up table,which could reduce the circuit complexity and greatly simplify the circuit.The hardware cost of modulator will be effectively reduced.The simulation and FPGA synthesis results show that the proposed method has the advantages for easy realization.Moreover,the cost is greatly reduced because the number of logic elements and memory bits was only 52 and 72,respectively.The method can effectively meet the requirements of lower cost in wireless sensor networks.

关 键 词：IEEE802.15.4 OQPSK 半正弦成型函数 全数字调制 无线传感网络 

分 类 号：TN92[电子电信—通信与信息系统] TN47[电子电信—信息与通信工程]