Next-generation 6G communication systems are envisaged to support ultra-reliability and massive connectivity with sensing capabilities. Orthogonal chirp division multiplexing (OCDM) offers intrinsic benefits such as schemes that endorse pulse compression and spread spectrum in radar and communication systems. On the other hand, non-orthogonal multiple access (NOMA) is a substantial scheme serving multiple users in the code-, time-, or frequency-domain. This paper proposes the integration of OCDM with downlink power-domain NOMA to leverage their complementary strengths—achieving enhanced reliability and connectivity. Using the Fresnel transform for OCDM, the average bit error rate (BER) results for the OCDM-NOMA system are presented with imperfect successive interference cancellation (SIC) errors. The proposed systems' BER performance is notably presented for downlink two-user NOMA systems with imperfect SIC errors. Monte-Carlo simulations of BER are shown for the aforesaid system over transmit SNR and power fraction coefficient variation. Index Terms—6G, orthogonal chirp division system, non-orthogonal multiple access, Fresnel transform, orthogonal frequency-division multiplexing.