Porovnat metody
Prohlédněte si vybrané metody vedle sebe; řádky, které se liší, jsou zvýrazněny.
| Ortogonální dělení frekvence (OFDM)× | Multiple-Input Multiple-Output (MIMO)× | |
|---|---|---|
| Obor | Telekomunikace | Telekomunikace |
| Rodina | Process / pipeline | Process / pipeline |
| Rok vzniku≠ | 1971 | 1995 |
| Tvůrce≠ | Weinstein and Ebert | Telatar, Foschini, and Gans |
| Typ≠ | multicarrier modulation scheme | spatial multiplexing technique |
| Původní zdroj≠ | 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 ↗ | Telatar, I. (1999). Capacity of multi-antenna Gaussian channels. European Transactions on Telecommunications, 10(6), 585-595. DOI ↗ |
| Další názvy≠ | multicarrier modulation | spatial multiplexing, antenna diversity |
| Příbuzné | 5 | 5 |
| Shrnutí≠ | 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. | 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. |
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