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디지털 통신 Summary Note(2)

"디지털 통신 Summary Note(2)"에 대한 내용입니다.
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최초등록일 2023.02.06 최종저작일 2023.02
디지털 통신 디지털 통신 네트워크
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디지털 통신 Summary Note(2)
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    Base-band demodulation and detection
    Signal and noise, Detection of binary signals in Gaussian noise, Intersymbol interference, Equalization으로 구성되어 있습니다.

    Band-pass modulation and detection
    Why modulate?, Digital Bandpass Modulation Techniques, Detection of signals in Gaussian noise, Coherent Detection, non coherent detection, Complex Envelop의 설명을 담고 있습니다.

    01. Base-band demodulation and detection
    [디지털 통신 Summary Note ①]에서 analog waveform이 sampling과 quantization과정을 거쳐서 binary stream으로 변 환되고 이 변환된 binary stream을 base-band channel을 통해 전송하기 위해 전기적 신호인 base-band waveform으 로 변환하는 과정이 base-band modulation임을 알아 보았다. 그러면 수신단에서는 위와 같은 과정을 역으로 수행하여 입력 받은 base-band waveform을 binary stream으로 변환하는 과정이 필요하며 이를 base-band demodulation이라 한다.
    이때 수신단에 도착한 waveform은 non-ideal channel을 통과하는 과정에서 distortion을 겪게 되며 이는 더 이상 ideal base-band waveform의 형태를 가지지 않는다.
    이번 장에서는 이러한 waveform을 왜곡시키는 noise와 ISI(inter symbol interference)에 대해 알아보며 이를 해결하기 위한 방법에 대해 알아본다.

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  • AI와 토픽 톺아보기

    • 1. Base-band demodulation and detection
      Base-band demodulation and detection is a fundamental concept in digital communication systems. It involves the process of recovering the original information-bearing signal from the received signal, which has been modulated and transmitted over a communication channel. This process is crucial for ensuring accurate data transmission and reception. The key aspects of base-band demodulation and detection include signal filtering, timing recovery, and decision-making algorithms. Understanding these principles is essential for designing efficient and reliable communication systems, particularly in applications where high-speed data transfer and low error rates are required.
    • 2. Signal and noise
      The concept of signal and noise is central to the field of communication systems. The signal represents the desired information-bearing waveform, while noise refers to the unwanted disturbances that can corrupt the signal during transmission. Effectively managing the relationship between signal and noise is crucial for achieving reliable communication. This involves techniques such as signal amplification, noise reduction, and signal-to-noise ratio (SNR) optimization. Understanding the characteristics and sources of noise, as well as the methods for mitigating its impact, is essential for designing robust communication systems that can operate in challenging environments. Mastering the principles of signal and noise is a fundamental requirement for engineers working in the field of digital communications.
    • 3. Detection of binary signals in Gaussian noise
      The detection of binary signals in Gaussian noise is a fundamental problem in digital communication systems. Gaussian noise is a common type of noise that arises from various sources, such as thermal noise and electronic circuit noise. Detecting binary signals, which can take on one of two possible values, in the presence of Gaussian noise is a crucial task for ensuring accurate data transmission and reception. This involves the use of optimal detection algorithms, such as the maximum likelihood (ML) detector, which aim to minimize the probability of error by making the best decision based on the received signal and the known characteristics of the noise. Understanding the principles of binary signal detection in Gaussian noise is essential for designing efficient communication systems, particularly in applications where reliable data transfer is critical, such as in wireless communications, satellite communications, and digital audio/video transmission.
    • 4. Intersymbol interference
      Intersymbol interference (ISI) is a significant challenge in digital communication systems, particularly in high-speed data transmission. ISI occurs when the transmitted symbols interfere with each other due to the dispersive nature of the communication channel, leading to distortion and degradation of the received signal. This can result in increased error rates and reduced system performance. Addressing ISI requires the use of various techniques, such as equalization, pulse shaping, and channel coding, to mitigate its effects. Understanding the causes, characteristics, and impact of ISI is essential for designing robust communication systems that can operate reliably in the presence of channel impairments. Mastering the principles of ISI is a crucial skill for communication engineers working on the development of high-speed, high-performance digital communication systems.
    • 5. Equalization
      Equalization is a crucial technique in digital communication systems for mitigating the effects of intersymbol interference (ISI) and other channel impairments. Equalization involves the use of filters or adaptive algorithms to compensate for the distortions introduced by the communication channel, effectively restoring the received signal to its original form. This is particularly important in high-speed data transmission, where ISI can significantly degrade the system performance. Equalization techniques can be implemented in the time domain, frequency domain, or a combination of both, depending on the specific requirements of the communication system. Understanding the principles of equalization, including the different types of equalizers and their design considerations, is essential for communication engineers to develop efficient and reliable digital communication systems that can operate in challenging channel conditions.
    • 6. Why modulate?
      Modulation is a fundamental process in digital communication systems that serves several important purposes. The primary reason for modulation is to enable the transmission of information-bearing signals over a communication channel. By modulating the signal, it can be adapted to the characteristics of the channel, such as the available bandwidth and frequency range. Modulation also allows for the efficient use of the available spectrum, as it enables the transmission of multiple signals simultaneously without interference. Additionally, modulation can improve the signal-to-noise ratio (SNR) and the robustness of the signal against channel impairments, such as fading and interference. Furthermore, modulation techniques can be used to implement various forms of multiplexing, such as frequency-division multiplexing (FDM) and code-division multiple access (CDMA), which are essential for enabling multiple users to share the same communication channel. Understanding the reasons for modulation and the various modulation techniques is crucial for the design and implementation of efficient and reliable digital communication systems.
    • 7. Digital Bandpass Modulation Techniques
      Digital bandpass modulation techniques are essential for transmitting information over communication channels that operate at radio frequencies (RF) or microwave frequencies. These techniques involve modulating a high-frequency carrier signal with the information-bearing baseband signal, allowing the signal to be transmitted over the desired frequency band. Common digital bandpass modulation techniques include amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), and quadrature amplitude modulation (QAM). Each of these techniques has its own advantages and trade-offs in terms of spectral efficiency, power efficiency, and resilience to channel impairments. Understanding the principles, characteristics, and applications of these digital bandpass modulation techniques is crucial for communication engineers to design and implement efficient and reliable RF and microwave communication systems, such as those used in wireless communications, satellite communications, and radar systems.
    • 8. Detection of signals in Gaussian noise
      The detection of signals in the presence of Gaussian noise is a fundamental problem in digital communication systems. Gaussian noise is a common type of noise that arises from various sources, such as thermal noise and electronic circuit noise. Accurately detecting the transmitted signal in the presence of Gaussian noise is crucial for ensuring reliable data transmission and reception. This involves the use of optimal detection algorithms, such as the maximum likelihood (ML) detector, which aim to minimize the probability of error by making the best decision based on the received signal and the known characteristics of the noise. Understanding the principles of signal detection in Gaussian noise, including the derivation of optimal detectors and the analysis of their performance, is essential for communication engineers to design efficient and robust communication systems that can operate reliably in noisy environments. This knowledge is particularly important in applications such as wireless communications, satellite communications, and digital audio/video transmission.
    • 9. Complex Envelop
      The concept of the complex envelope is a powerful tool in the analysis and design of digital communication systems. The complex envelope representation of a signal allows for a more compact and intuitive description of the signal's characteristics, particularly in the context of bandpass signals. By representing the signal as a complex-valued function, the complex envelope captures both the amplitude and phase information of the signal, which is crucial for understanding modulation techniques, signal processing, and the behavior of communication channels. Understanding the properties and applications of the complex envelope, such as the Hilbert transform, analytic signals, and the representation of modulated signals, is essential for communication engineers to effectively analyze, design, and implement efficient digital communication systems. Mastering the complex envelope concept is a fundamental skill for anyone working in the field of digital communications.
    • 10. M-ary Signaling and Performance
      M-ary signaling is a technique used in digital communication systems to transmit multiple bits of information per symbol by using a larger signal constellation. This allows for more efficient use of the available bandwidth, as more information can be transmitted in the same amount of time. However, the performance of M-ary signaling is affected by factors such as the signal-to-noise ratio (SNR), the size of the signal constellation, and the specific modulation scheme used. Understanding the principles of M-ary signaling, including the trade-offs between spectral efficiency, power efficiency, and error performance, is crucial for communication engineers to design and optimize digital communication systems for various applications. This knowledge is particularly important in high-speed data transmission, where the efficient use of bandwidth is critical, as well as in applications where power consumption and error tolerance are key considerations, such as in wireless communications and satellite communications.

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