Why space time coding

The resulting scheme is referred to as the differentia Space-time differential coding STDC is an effective technique for exploiting transmitter diversity while it does not require the channel state information at the receiver.

However, like conventional differen Authors: Yan Liu and Xiaodong Wang. Multiuser detection for space-time coded synchronous multiple-access systems in the presence of independent Rayleigh fading is considered.

Under the assumption of quasi-static fading, it is shown that optimal Authors: Sudharman K. Jayaweera and H. Vincent Poor. We propose combining channel estimation and optimal power allocation approaches for a multiple-antenna orthogonal frequency division multiplexing OFDM system in high-speed transmission applications.

We devel A space-time channel coding technique is presented for overcoming turbulence-induced fading in an atmospheric optical heterodyne communication system that uses multiple transmit and receive apertures.

In parti Authors: Shane M. Chapter First Online: 23 November This is a preview of subscription content, log in to check access. Liang, Orthogonal designs with maximum rates. IEEE Trans. Theory 49 10 , — Google Scholar. Tarokh, N. Seshadri, A.

Calderbank, Space-time codes for high data rate wireless communications: performance criterion and code construction. Tarokh, A. Naguib, N. Calderbank, Space-time codes for high data rate wireless communication: performance criteria in the presence of channel estimation errors, mobility, and multiple paths. Alamouti, A simple transmit diversity technique for wireless communications. IEEE J. When using space-time block coding, the data stream is encoded in blocks prior to transmission.

These data blocks are then distributed among the multiple antennas which are spaced apart to decorrelate the transmission paths and the data is also spaced across time. A space time block code is usually represented by a matrix.

Each row represents a time slot and each column represents one antenna's transmissions over time. Within this matrix, Sij is the modulated symbol to be transmitted in time slot i from antenna j. There are to be T time slots and nT transmit antennas as well as nR receive antennas. This block is usually considered to be of 'length' T.

The MIMO Alamouti scheme is an ingenious transmit diversity scheme for two transmit antennas that does not require transmit channel knowledge.