Off-diagonal elements of and gives the correlation between signals at different antenna elements. Equation II gives the information of received signal power with the help of covariance matrix . 3.Space Time Block Code It is the advance form of an Alamouti scheme; it holds all the important feat...
29、 hold onend% hold offtraining _ symbol.m%function tx _ training _ symbols = training _ symbol (nt, carrier _ count)j = sqrt (- 1);wk = exp (2 * pi / carrier _ count) * in);training _ symbols = 1 j j 1 - 1 - j - j - 1 1 j j 1 - 1 - j - j - 1 1 ...
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In (14) for example, the energy of the last two antenna branches are reduced by the eliminated off-diagonal ISI terms so that the resulting gains are more on the first two antenna branches. This can be useful with RF-chain switching and also when using directional communications to ...
On the other hand, the term HH H in (13) also permits linear decoding and eliminates the off-diagonal β interfering terms, such as: 1+β HHH = σh2 0 0 0 0 1+β 0 0 0 0 1−β 0 0 0 0 1−β (14) Observe that HH H ...