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| ترميز ألاموتي للكتلة الفضائية الزمنية× | تضمين التردد بتقسيم التعامد (OFDM)× | |
|---|---|---|
| المجال | الاتصالات | الاتصالات |
| العائلة | Process / pipeline | Process / pipeline |
| سنة النشأة≠ | 1998 | 1971 |
| صاحب الطريقة≠ | Siavash Alamouti | Weinstein and Ebert |
| النوع≠ | space-time coding scheme | multicarrier modulation scheme |
| المصدر التأسيسي≠ | Alamouti, S. M. (1998). A simple transmit diversity technique for wireless communications. IEEE Journal on Selected Areas in Communications, 16(8), 1451-1458. 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 ↗ |
| الأسماء البديلة≠ | space-time coding, transmit diversity | multicarrier modulation |
| ذات صلة | 5 | 5 |
| الملخص≠ | The Alamouti code is an elegant space-time coding scheme that provides full transmit diversity using two antennas and a simple linear receiver. Introduced by Siavash Alamouti in 1998, it requires no channel state information at the transmitter, achieves the same bit-error rate as a single-antenna system with receiver diversity, and uses linear processing for decoding. The Alamouti code has become the de facto standard for transmit diversity in cellular systems and is adopted in LTE, WiFi, and many 5G protocols. | 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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