An electrical stimulation lead includes at least one lead body having a distal end portion, a proximal end portion, and a longitudinal length； multiple electrodes disposed along the distal end portion of the at least one lead body； and at least one terminal disposed along the proximal end portion of the at least one lead body. The lead has more electrodes than terminals. The lead also includes a signal separator disposed along the lead between the electrodes and the at least one terminal； at least one terminal conductor electrically coupling the at least one terminal to the signal separator； and multiple electrode conductors. Each electrode conductor electrically couples the signal separator to a different one of the electrodes. The lead has more electrode conductors than terminal conductors. The signal separator receives signals from the at least one terminal conductor and separates the signals by frequency into electrode signals.
