A packet transmitter includes a higher layer transmission block and a lower layer transmission block. The higher layer transmission block generates a higher layer data signal including payload data and a header for each packet of a plurality of packets based on an application layer data signal and an application layer control signal. The higher layer transmission block outputs the header after the payload data through the higher layer data signal. The lower layer transmission block generates a lower layer data signal including the header and the payload data for each packet based on the higher layer data signal and a higher layer control signal. The lower layer transmission block outputs the payload data after the header through the lower layer data signal.