  In this letter, we investigate Rate-Splitting Multiple Access (RSMA) for an
uplink communication system with finite blocklength. Considering a two-user
Single-Input Single-Output (SISO) Multiple Access Channel (MAC), we study the
impact of Signal-to-Noise Ratio (SNR), blocklength, power allocation and target
rate on the error probability performance of RSMA where one user message is
split. We demonstrate that RSMA can improve the error probability performance
significantly compared to Non-Orthogonal Multiple Access (NOMA) and RSMA can
have a larger rate region than NOMA.
