CAJ | 학술논문

为了验证数字脉冲间隔调制（DPIM ）在紫外光通信中应用的可行性，设计了基于FPGA的DPIM 调制和解调系统。调制过程在锁存器的控制下，将串并转换后的数据输入比较器，并与计数值相比较产生DPIM 调制信号；在解调端，利用计数器检测相邻光脉冲间的空时隙数，在锁存器的控制下，恢复得到原始数据。以16‐DPIM 为例，随机输入一组串行二进制数据，经过调制系统得到了16‐DPIM 信号；同样随机输入一个16‐DPIM 调制信号，通过解调系统恢复得到了原始数据。并在此基础上提出了一种新型的双幅度、定长DPIM 调制方式，能更好地弥补DPIM符号长度不固定的缺陷。
위료험증수자맥충간격조제（DPIM ）재자외광통신중응용적가행성，설계료기우FPGA적DPIM 조제화해조계통。조제과정재쇄존기적공제하，장천병전환후적수거수입비교기，병여계수치상비교산생DPIM 조제신호；재해조단，이용계수기검측상린광맥충간적공시극수，재쇄존기적공제하，회복득도원시수거。이16‐DPIM 위례，수궤수입일조천행이진제수거，경과조제계통득도료16‐DPIM 신호；동양수궤수입일개16‐DPIM 조제신호，통과해조계통회복득도료원시수거。병재차기출상제출료일충신형적쌍폭도、정장DPIM 조제방식，능경호지미보DPIM부호장도불고정적결함。
In order to verify the feasibility of digital pulse interval modulation(DPIM )used in ul‐traviolet(UV) communication ,a DPIM modulation and demodulation system was designed based on field programmable gate array (FPGA) .The deserialized data was input into the com‐parator under the control of latch during modulation process ,and the DPIM modulation signal was output through comparing with the count value .In the demodulator ,the number of free slot between neighbor pulses was detected by counter ,and the original data was acquired through recovering under the control of latch .In the case of 16‐DPIM ,we input a set of serial binary data randomly and output 16‐DPIM signal in modulation system .In the same w ay ,w e input a 16‐DPIM modulation signal randomly and recovered the original data in demodulation system .On the basis of this analysis ,a new dual‐amplitude fixed‐length DPIM modulation which could make up the lack of the DPIM symbol length change was proposed .