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Digital Communications by Lan Glover, Dr Peter Grant Book Details
| Book Name | Digital Communications |
| Author | Lan Glover, Dr Peter Grant |
| Category | Electrical Engineering Books, Education Books |
| Book Language | English |
| Pages | 764 |
| ISBN | 0273718304 |
| Country | India |
| Book Size | 31 MB |
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About Digital Communications by Lan Glover, Dr Peter Grant Book
Digital communications is a field of study that deals with the transmission of digital information (data) between two or more points using various communication techniques and technologies. Unlike analog communication, which involves continuous signals, digital communication uses discrete signals represented by binary digits (bits). This approach offers advantages such as improved noise immunity, error correction, and compression. Here's an overview of digital communications:
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Basic Concepts:
- Digital Signals: Discrete signals that can take on specific values, typically represented as binary 0s and 1s.
- Bit Rate: The rate at which bits are transmitted, measured in bits per second (bps) or kilobits per second (kbps).
- Symbol Rate: The rate at which symbols are transmitted, where each symbol represents multiple bits.
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Key Components:
- Source: The origin of the digital information, such as a computer, smartphone, or sensor.
- Encoder: Converts the source data into a digital format suitable for transmission.
- Channel: The medium through which the digital signal is transmitted, such as wired or wireless communication.
- Modulation: The process of modifying a carrier signal's amplitude, frequency, or phase to carry digital information.
- Demodulation: The process of extracting the original digital signal from the modulated carrier.
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Digital Modulation Techniques:
- Amplitude Shift Keying (ASK): Modulates the carrier's amplitude to represent digital bits.
- Frequency Shift Keying (FSK): Modulates the carrier's frequency to represent digital bits.
- Phase Shift Keying (PSK): Modulates the carrier's phase to represent digital bits.
- Quadrature Amplitude Modulation (QAM): Combines both amplitude and phase modulation to transmit multiple bits per symbol.
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Error Detection and Correction:
- Error Detection: Adding redundancy to the transmitted data to detect errors using techniques like checksums or cyclic redundancy checks (CRC).
- Error Correction: Using error-correcting codes to not only detect errors but also correct them, improving data reliability.
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Multiplexing and Demultiplexing:
- Multiplexing: Combining multiple digital signals into a single transmission channel to maximize channel utilization.
- Demultiplexing: Separating the combined signals back into their individual components.
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Channel Capacity and Bandwidth:
- Shannon's Capacity Theorem: States the maximum data rate that can be reliably transmitted over a communication channel, considering noise and bandwidth limitations.
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Digital Communication Systems:
- Point-to-Point Systems: Communication between two specific endpoints, often using technologies like fiber optics or wireless links.
- Broadcast Systems: One-to-many communication, such as digital television or radio broadcasting.
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Digital Communication Standards:
- Internet Protocols: TCP/IP (Transmission Control Protocol/Internet Protocol) is the foundation of the internet, enabling data transmission between devices.
- Wireless Standards: Standards like Wi-Fi (IEEE 802.11) and cellular networks (3G, 4G, 5G) facilitate wireless digital communication.
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Applications:
- Telecommunications: Voice and video calls, messaging, and data transmission over networks.
- Internet and Networking: Data exchange, web browsing, and online services.
- Broadcasting: Digital TV and radio broadcasting.
- Data Storage and Transmission: Digital communication is essential for transferring data between devices, servers, and storage systems.
Digital communications play a vital role in modern society, enabling global connectivity, efficient data transmission, and various digital services across industries.
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