Performance of Binary Phase Shift Keying with Dithering and Design of Hardware-Simple Digital Low-Pass Filters with Sharp Transition Bands

• Main Authors: Lin,Jin-Cheng, 林晉丞
• Other Authors: Shiung, David
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/yc5m5f

碩士 === 國立彰化師範大學 === 電信工程研究所 === 105 === The first topic, we discuss whether the dithering technique is effective in binary phase shift keying modulation. In order to achieve dithering, the dithering signal must be independent of the input signal. In this paper, the binary phase shift keying is used to add the artificial analog noise signal to binary phase shift keying (BPSK) modulation, the quantization of the noise is reduced as much as possible by quantification of the analog-to-digital converter (ADC), and the signal after sampling is converted to spectrum by Fourier transform. We compare the bit error rate (BER) with different quantization bits and add the dither signal, and improve the spur on the spectrum. The second topic, we propose a new method to design a cascade digital low-pass filter (LPF) and implement the design with the software, it is interesting that we use the hardware-simple complementary comb filter as an shaping filter and reshape the frequency response of the prototype filter. Using a second order infinite impulse response (IIR) filter cascade with one or two complementary comb filters, the filter after the cascade has a very sharp transition band and a very flat passband, this composite filter inherits other features of the infinite impulse response filter, which includes a very deep cut-off band. The new filter in this paper as long as the user according to our design of the human–machine interaction steps to enter the required parameters of the value, you can output several groups of filters to meet the constraints to facilitate the follow-up hardware to achieve, this design allows users to have more The flexibility to design a high efficiency filter system with low system complexity.