Maximum ratio transmission

摘要

An arrangement where a transmitter has a plurality of transmitting antennas that concurrently transmit the same symbol, and where the signal delivered to each transmitting antenna is weighted by a factor that is related to the channel transmission coefficients found between the transmitting antenna and receiving antennas. In the case of a plurality of transmit antennas and one receiving antenna, where the channel coefficient between the receive antenna and a transmit antenna [I] i is h_i, the weighting factor is h_i* divided by a normalizing factor, alpha, which is ${\left(\sum _{k=1}^K{h_k}^2\right)}^{\text{1/2}},$ where K is the number of transmitting antennas. When more than one receiving antenna is employed, the weighting factor is $\frac{1}{a}{\left(\mathrm{gH}\right)}^H,$ where g =[g₁. . . g_L), H is a matrix of channel coefficients, and alphais a normalizing factor ${\left(\sum _{p=l}^L\sum _{q=l}^L\sum _{k=l}^K{h}_{pk}{h}_{\mathrm{qk}}^{*}\right)}^{\text{1/2}}.$