摘 要:介绍一种通过串口通信来控制微型步进电机的方法,控制指令由在PC机的控制界面发送,单片机MSP430F149通过串口接收控制指令继而驱动步进电动机。串口通信采用USB转UART桥接器芯片CP2102和驱动电路中的A3901芯片,都只需要很少的外围元器件,从而简化了驱动及控制电路,使其可应用于一些微控制的场合。 关键词:步进电机;串口通信;CP2102; A3901
Abstract: An efficient differential detection technique of GMSK system using decision feedback(DF) was proposed. This new method, by adding a broad band 90° phase-shift network after the LPF(Low Pass Filter) and a software decision method, presented the same performance as that of conventional DF detection system, but avoided the degradation in BER performance induced by the delay of LPF. The complexity of operation for the new DF system can be decreased as half the former system. This new method is especially useful for portable frequency hopping communication terminal. From the probability distribution of the phase angle between two vectors perturbed by Gaussian noises, the formulae of error probability performance of DF system were obtained. Simulation results show that the theoretical investigation gives analogous results with the Monte Carlo error counting technique. Key words: decision feedback; GMSK; differential detection; error probability
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