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| Hordozóérzékeléses Többszörös Hozzáférés Ütközés Elkerüléssel (CSMA/CA)× | Ortogonális Frekvencia-Multiplexelés (OFDM)× | |
|---|---|---|
| Tudományterület | Távközlés | Távközlés |
| Módszercsalád | Process / pipeline | Process / pipeline |
| Keletkezés éve≠ | 1990 | 1971 |
| Megalkotó≠ | Phil Karn | Weinstein and Ebert |
| Típus≠ | random access protocol | multicarrier modulation scheme |
| Alapmű≠ | Karn, P. (1990). MACA—a new channel access method for packet radio. In Proceedings of the ARRL/CRRL Amateur Radio 9th Computer Networking Conference, 134-140. link ↗ | Weinstein, S. B., & Ebert, P. M. (1971). Data transmission by frequency-division multiplexing using the discrete Fourier transform. IEEE Transactions on Communication Technology, 19(5), 628-634. DOI ↗ |
| Alternatív nevek≠ | medium access control, WiFi MAC | multicarrier modulation |
| Kapcsolódó≠ | 3 | 5 |
| Összefoglaló≠ | CSMA/CA is a random access protocol for wireless medium access control, designed to enable multiple devices to share a wireless channel while minimizing collisions. Introduced by Phil Karn in 1990, it is the foundation of WiFi (IEEE 802.11) and is now the de facto standard for unlicensed spectrum access. CSMA/CA combines carrier sensing (listen before transmit) with collision avoidance (RTS/CTS handshake) to improve channel efficiency and fairness, avoiding the efficiency loss of pure random access (Aloha). | OFDM is a multicarrier modulation technique that divides a wideband channel into many narrowband orthogonal subcarriers. Introduced by Weinstein and Ebert in 1971, it exploits the duality between time and frequency domains to efficiently use spectrum while mitigating intersymbol interference in frequency-selective channels. OFDM is now the standard for high-speed wireless systems including WiFi, cellular LTE, and digital broadcasting. |
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