  In this paper we propose a new class of spatially coupled codes based on
repeat-accumulate protographs. We show that spatially coupled repeat-accumulate
codes have several advantages over spatially coupled low-density parity-check
codes including simpler encoders and slightly higher code rates than spatially
coupled low-density parity-check codes with similar thresholds and decoding
complexity (as measured by the Tanner graph edge density).
