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| Több bemenetű több kimenetű (MIMO)× | Ortogonális Frekvencia-Multiplexelés (OFDM)× | |
|---|---|---|
| Tudományterület | Távközlés | Távközlés |
| Módszercsalád | Process / pipeline | Process / pipeline |
| Keletkezés éve≠ | 1995 | 1971 |
| Megalkotó≠ | Telatar, Foschini, and Gans | Weinstein and Ebert |
| Típus≠ | spatial multiplexing technique | multicarrier modulation scheme |
| Alapmű≠ | Telatar, I. (1999). Capacity of multi-antenna Gaussian channels. European Transactions on Telecommunications, 10(6), 585-595. DOI ↗ | 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≠ | spatial multiplexing, antenna diversity | multicarrier modulation |
| Kapcsolódó | 5 | 5 |
| Összefoglaló≠ | MIMO is a technique that uses multiple transmit and receive antennas to significantly increase channel capacity and reliability. Pioneered theoretically by Telatar (1999) and Foschini & Gans (1998), MIMO exploits multipath propagation—typically a liability in wireless—as an asset by creating independent spatial channels. It is now fundamental to all modern wireless systems including LTE, WiFi-6, and 5G, where it provides both capacity gains through spatial multiplexing and robustness through diversity. | 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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