Читать книгу Spatial Multidimensional Cooperative Transmission Theories And Key Technologies - Lin Bai - Страница 43

A hybrid approach combines the selection algorithm with the maximum ratio combining. At each moment, the receiver first selects branches with the largest SNR among M_R branches and then combines them by the maximum ratio combining algorithm. This strategy is called augmentation selection.

Obviously, it can be concluded that the average SNR of the combiner output is the sum of the two items. The first item corresponds to the maximum ratio combining branches and the second item is generated from the branches of the M_R branches, which is the extension of Eq. (2.95). Therefore, the overall array gain is

Similarly, for selective combining ( = 1), the diversity gain of the hybrid selection combining and maximum ratio combining is equal to M_R instead of .