论文部分内容阅读
探讨采用TMS320F28335 DSP(数字信号处理器)芯片结合TLV320AIC23 CODEC芯片软件方式实现CIR(铁路机车综合无线通信设备)系统的FFSK(快速频移键控)信号调制与解调方法。为节省嵌入系统的存储开销,采用查表法产生FF-SK调制信号。对FFSK已调信号的解调,通过适当选取信号采样频率、合理设计输入、输出数字滤波器,利用采样信号输入样本与延时输入样本相乘来恢复FFSK已调信号中的数字信息。同时给出一些提高FFSK信号调制与解调准确性、可靠性的具体、可行措施。
This paper discusses the FFSK (Fast Frequency Shift Keying) signal modulation and demodulation method using the TMS320F28335 DSP (digital signal processor) chip combined with the TLV320AIC23 CODEC chip software to realize the CIR (railway locomotive integrated wireless communication device) system. In order to save the storage cost embedded system, the use of look-up table to generate FF-SK modulation signal. The FFSK modulated signal demodulation, by properly selecting the signal sampling frequency, the rational design of input and output digital filter, the use of sampling signal input samples and delayed input samples multiplied to restore the FFSK modulated signal digital information. At the same time, some concrete and feasible measures to improve the accuracy and reliability of FFSK signal modulation and demodulation are given.