Terminology In Telecommunication
Digital data is represented as strings of 0s and 1s, while analog data modifies signal properties like amplitude or frequency. Source coding prepares data for transmission by reducing redundancy or converting to digital. Channel coding adds redundant data to allow error detection and correction during transmission. Modulation varies signal properties to transmit information. Multiplexing combines multiple channels into one signal to share a medium, like frequency division multiplexing assigning each a frequency. Code division multiplexing assigns unique codes to differentiate signals in the same spectrum, like code division multiple access used in wireless. Time division multiplexing allows channels to take turns on a channel, like the time slots used in GSM networks.
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Terminology In Telecommunication
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Notas do Editor
- In telecommunications, a carrier wave, or carrier is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information. This carrier wave is usually of much higher frequency than the input signal.
- a channel access method or multiple access method allows several terminals connected to the same multi-point physical medium to transmit over it and to share its capacity. Examples of shared physical media are wireless networks , bus networks , ring networks , hub networks and half-duplex point-to-point links.
- Spread-spectrum techniques are methods by which electromagnetic energy generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure communications, increasing resistance to natural interference and jamming, and to prevent detection.