The modulated signals of π /4-DQPSK can be demodulated with the differenced method, and the technology has been used in the communication. The traditional demodulated method needs a lot of calculation. In this paper,...The modulated signals of π /4-DQPSK can be demodulated with the differenced method, and the technology has been used in the communication. The traditional demodulated method needs a lot of calculation. In this paper, a new method based on fast arithmetic digital demodulation of DQPSK is presented. The new method only uses the sign of the modulated signal instead of digital signal through the A/D in the traditional method. With the new method, the system has higher speed, and can save some hardware in the FPGA. An experiment of the new method with the DQPSK is given in this paper.展开更多
由于IEEE802.15.6协议规定了在不同数据速率下,BAN物理层采用不同的调制方式,为此,文章以其为基础,提出一种基于查找表的联合调制算法。该算法通过分析π/2-DBPSK和π/4-DQPSK的原理,以合并查找表的方式实现两种调制方式的统一。最后,利...由于IEEE802.15.6协议规定了在不同数据速率下,BAN物理层采用不同的调制方式,为此,文章以其为基础,提出一种基于查找表的联合调制算法。该算法通过分析π/2-DBPSK和π/4-DQPSK的原理,以合并查找表的方式实现两种调制方式的统一。最后,利用Model Sim SE 10.1b对算法进行了逻辑功能验证,并编写Verilog硬件描述代码进行了FPGA的板级验证。展开更多
文摘The modulated signals of π /4-DQPSK can be demodulated with the differenced method, and the technology has been used in the communication. The traditional demodulated method needs a lot of calculation. In this paper, a new method based on fast arithmetic digital demodulation of DQPSK is presented. The new method only uses the sign of the modulated signal instead of digital signal through the A/D in the traditional method. With the new method, the system has higher speed, and can save some hardware in the FPGA. An experiment of the new method with the DQPSK is given in this paper.
文摘由于IEEE802.15.6协议规定了在不同数据速率下,BAN物理层采用不同的调制方式,为此,文章以其为基础,提出一种基于查找表的联合调制算法。该算法通过分析π/2-DBPSK和π/4-DQPSK的原理,以合并查找表的方式实现两种调制方式的统一。最后,利用Model Sim SE 10.1b对算法进行了逻辑功能验证,并编写Verilog硬件描述代码进行了FPGA的板级验证。
