This paper addresses the coded cooperation in single carrier transmission with frequency-domain equalization. A practical cooperation strategy is provided to facilitate the timefrequency-space diversity for the coded Single Carrier Frequency Division Multiple Access system over frequency-selective Rayleigh block fading channels. To take advantage of the timefrequency dispersion and to facilitate the space diversity through cooperation, each user transmits his partner's and his own interleaved data on different subcarriers spreading over the entire available bandwidth. The allocation of subcarriers to each user and his partners can be either pre-specified or dynamically determined. Numerical simulations show that the proposed scheme outperforms the direct transmission with improved diversity gains.