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| Ortogonal FrekvensdelingsMultiplex (OFDM)× | Polarkoder med successiv annulleringsafkodning× | |
|---|---|---|
| Fagområde | Telekommunikation | Telekommunikation |
| Familie | Process / pipeline | Process / pipeline |
| Oprindelsesår≠ | 1971 | 2009 |
| Ophavsperson≠ | Weinstein and Ebert | Erdal Arikan |
| Type≠ | multicarrier modulation scheme | recursive error-correcting code |
| Oprindelig kilde≠ | 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 ↗ | Arikan, E. (2009). Channel polarization: A method for constructing capacity-achieving codes for symmetric binary-input memoryless channels. IEEE Transactions on Information Theory, 55(7), 3051-3073. DOI ↗ |
| Aliasser≠ | multicarrier modulation | channel polarization, recursive codes |
| Relaterede | 5 | 5 |
| Resumé≠ | 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. | Polar codes, introduced by Erdal Arikan in 2009, are the first constructive family of codes proven to achieve the Shannon capacity of symmetric binary-input memoryless channels. They use recursive construction and successive cancellation decoding, a simple greedy algorithm with theoretical guarantees. Polar codes were adopted in 5G NR for control channel coding and are studied for future 6G systems. Unlike turbo and LDPC codes (which are empirical), polar codes provide rigorous theoretical foundations. |
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