【摘要】 为了分析并行结构的中频采样的数字解调器中时域截断对解调结果的影响,解释了并行滤波的时域截断产生机制。通过把并行滤波的码元分段处理,找出了分段大小和误比特率之间的关系,得到了由并行宽度和输出宽度表示的误比特率的计算公式,使得可以定量地表达时域截断对解调结果的影响,并用计算机仿真予以验证。应用该公式分析并行宽度为4个码元,输出宽度为2个码元的解调器,并行滤波的时域截断导致的解调损失约为0.6 dB。更多还原

【Abstract】 The influence of time domain truncation on the demodulation results for an intermediate frequency digital sampling demodulator with a parallel filtering structure was analyzed to improve the demodulation results.Subsections of the symbols in parallel filter are processed to find the relationship between the subsection size and the bit error rate.The bit error rate is related to the parallel width and the output width,so the influence of time domain truncation on the demodulation result can be expressed quantitatively.Simulations show that for a 4-symbol parallel width 2-symbol output width demodulator,the demodulation loss caused by time domain truncation in the parallel filter is about 0.6 dB.更多还原