Recently, frequency-domain pre-equalization (pre-FDE) transmission has been attracting attention for improving the broadband DS-CDMA (or single carrier (SC)) transmission performance in a frequency-selective fading channel. To further improve the transmission performance, antenna diversity technique is very effective. However, so far the joint use of pre-FDE and the receive diversity has not been fully discussed. Recently, we proposed the space-time block coded-joint transmit/receive diversity (STBC-JTRD) for the narrow-band transmission in a frequency-nonselective fading channel. STBC-JTRD allows an arbitrary number of transmit antennas while limiting the number of receive antennas to 4. In this paper, we extend the STBC-JTRD to the case of frequency-selective fading channel and propose the frequency-domain STBC-JTRD for the SC transmission in a frequency-selective fading channel. The average bit error rate (BER) performance of the SC transmission with frequency-domain STBC-JTRD is evaluated by the computer simulation.