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Antenna selection and relay selection are two potent methods to enrich the system capacity by selecting the perfect one to function. In this letter, a downlink multiple-input multiple-output decode-and-forward relaying network is analyzed by considering Nakagami- fading as a model for the channel gains. The system performance is analyzed by using a joint scheme (JS), which joints the relay selection and the antenna selection at the base station and the selected relay. A closed-form expression corresponding to the outage probability is derived, and the approximate expression of the outage probability in the high-signal-to-noise-ratio regime is obtained. Finally, simulations show the superiority of the JS.