The invention provides a joint optimization method and device of a
transceiver in a wirelessly powered
MIMO relay system. The method comprises the following steps: acquiring a
signal characteristic ofa
signal to be transmitted, a first channel matrix, a second channel matrix, a third channel matrix, a first energy conversion rate and a second energy conversion rate; respectively decomposing the first channel matrix and the second channel matrix to obtain a first
diagonal element and a second
diagonal element; calculating according to the
signal characteristic, the first
diagonal element, thesecond diagonal element, the first energy conversion rate and the second energy conversion rate to obtain
energy conversion efficiency corresponding to the
system; and optimizing a
time switching factor of the
system and each
precoding matrix according to the
energy constraint condition with reference to the first channel matrix, the third channel matrix, the energy conversion rate, the
signal characteristic and the nominal power and peak power of a source node. By adoption of the method, the communication process of each node of the system can be optimized, the adjustable degree of freedom ofthe
precoding matrix is improved, and the signal
transmission rate of the system is enhanced.