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    • By Admin / 16 Aug 22 / 0 Comments

      Introduction to Digital Baseband Signal Waveforms

      A digital baseband signal is an electrical waveform that represents digital information, which can be represented by different levels or pulses. There are many types of digital baseband signals (hereinafter referred to as baseband signals). Figure 6-1 shows a few basic baseband signal waveforms, ...
      Introduction to Digital Baseband Signal Waveforms
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    • By Admin / 15 Aug 22 / 0 Comments

      Learning About The Signal

      Acknowledgment signals can be divided into energy signals and power signals according to their strengths. Power signals can be divided into periodic signals and aperiodic signals according to whether they are periodic or not. The energy signal is finite in amplitude and duration, its energy is fi...
      Learning About The Signal
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    • By Admin / 12 Aug 22 / 0 Comments

      Frequency Division Multiplexing

      When the transmission capacity of a physical channel is higher than the demand of one signal, the channel can be shared by multiple signals. For example, the trunk line of a telephone system usually has thousands of signals transmitted on one optical fiber. Multiplexing is the technology that sol...
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    • By Admin / 11 Aug 22 / 0 Comments

      Common Code Types for Baseband Transmission

      1) The AMI code The full name of the AMI (Alternative Mark Inversion) code is the alternate mark inversion code. blank) remain unchanged. E.g: Message code: 0 1 1 0 0 0 0 0 0 0 1 1 0 0 1 1… AMI code: 0 -1 +1 0 0 0 0 0 0 0 -1 +1 0 0 -1 +1… The waveform corresponding to the AMI code is ...
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    • By Admin / 10 Aug 22 / 0 Comments

      Nonlinear modulation (Angle Modulation)

      When we transmit a signal, whether it is an optical signal, an electrical signal, or a wireless signal, if it is directly transmitted, the signal is easily disturbed by noise, and it is difficult to obtain accurate information at the receiving end. In order to improve the anti-interference abilit...
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    • By Admin / 09 Aug 22 / 0 Comments

      Binary Digital Modulation

      The basic modes of binary digital modulation are: Binary amplitude keying (2ASK)—amplitude change of the carrier signal; Binary frequency shift keying (2FSK)—frequency change of the carrier signal; Binary phase shift keying (2PSK)—phase change of the carrier signal. Differential phase shift keyin...
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