Multicast transmission method for single-cell fixed relay based on orthogonal space-time coding
A space-time coding, multicast transmission technology, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve the problems of signal interference, time-consuming base stations, and little effect.
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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0032] see figure 1 Firstly, the application scenario of the method of the present invention is introduced: the cell is provided with three single-antenna fixed relays uniformly arranged at a distance of two-thirds of the cell radius from the base station, with an angle difference of 120° from each other, that is, the number of antennas is n=3. In the retransmission phase, all three relays participate in the retransmission, and each relay antenna serves as a space diversity factor in the orthogonal space-time coding matrix, so the orthogonal space-time coding is a three-column matrix. At the same time, set the data transmission rate of the cell to Among them, m is the number of symbols contained in each data packet after the base station groups t...
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