Usporedite metode

	Ortogonalna frekvencijska multipleksacija podjele (OFDM)	Alamoutiev kod prostorno-vremenskog bloka	Teorem Shannonovog kapaciteta kanala
Područje	Telekomunikacije	Telekomunikacije	Telekomunikacije
Obitelj	Process / pipeline	Process / pipeline	Process / pipeline
Godina nastanka	1971	1998	1948
Tvorac	Weinstein and Ebert	Siavash Alamouti	Claude Shannon
Vrsta	multicarrier modulation scheme	space-time coding scheme	fundamental theoretical bound
Temeljni izvor	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.	Alamouti, S. M. (1998). A simple transmit diversity technique for wireless communications. IEEE Journal on Selected Areas in Communications, 16(8), 1451-1458.	Shannon, C. E. (1948). A mathematical theory of communication. Bell System Technical Journal, 27(3), 379-423.
Drugi nazivi	multicarrier modulation	space-time coding, transmit diversity	channel capacity, information theory bound
Srodne	5	5	5
Sažetak	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.	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.	Shannon's channel capacity theorem, published in 1948, establishes the maximum rate at which information can be reliably transmitted over a noisy channel. Expressed as C = B log2(1 + S/N) for additive white Gaussian noise (AWGN), it is a fundamental bound in information theory and communications engineering. Shannon proved that reliable communication is possible at any rate below capacity, and impossible above it. This theorem underpins the design of all modern communication systems and motivates coding theory, modulation, and signal processing techniques.