Linganisha mbinu
Pitia mbinu ulizochagua bega kwa bega; safu zinazotofautiana zinaangaziwa.
| Misimbo ya Usahihishaji Makosa ya Msongamano Mdogo (LDPC)× | Uhamilishaji wa Mgawanyo wa Marudio wa Orthogonal (OFDM)× | |
|---|---|---|
| Nyanja | Mawasiliano ya Simu | Mawasiliano ya Simu |
| Familia | Process / pipeline | Process / pipeline |
| Mwaka wa asili≠ | 1962 | 1971 |
| Mwanzilishi≠ | Robert Gallager | Weinstein and Ebert |
| Aina≠ | linear error-correcting code | multicarrier modulation scheme |
| Chanzo asilia≠ | Gallager, R. G. (1962). Low-density parity-check codes. IRE Transactions on Information Theory, 8(1), 21-28. 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 ↗ |
| Majina mbadala≠ | sparse codes, belief propagation codes | multicarrier modulation |
| Zinazohusiana | 5 | 5 |
| Muhtasari≠ | LDPC codes, invented by Robert Gallager in 1962 and rediscovered in the 1990s by MacKay, are linear error-correcting codes defined by sparse parity-check matrices. They achieve performance within 0.4 dB of the Shannon limit with iterative belief-propagation decoding and have become the standard for modern wireless (WiFi-6, 5G NR, Digital Video Broadcasting). Unlike turbo codes, LDPC codes have a more elegant graph-theoretic structure and more mature theoretical analysis. | 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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