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Space–time block code - Wikipedia, the free encyclopedia (1746 words) |
 | Space–time block coding is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data-transfer. |
| Its most serious disadvantage is that all but one of the codes that satisfy this criterion must sacrifice some proportion of their data rate (see Alamouti's code). |
| Alamouti invented the simplest of all the STBCs in 1998 |
| MIMO Wireless Communications (1226 words) |
| A block code is a code that operates on a "block" of data at a time and the output only depends on the current input bits. |
| There are other codes, such as "convolutional codes" whose output is dependant on the current input, and also on the previous inputs. |
| Since the Alamouti code is a full rate code there is no immediate increase in the data rate of the system. |
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