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Rate-Splitting Multiple Access with a SIC-Free Receiver: An Experimental Study

Guoqian Sun, Xinze Lyu, Bruno Clerckx

Abstract

Most Rate-Splitting Multiple Access (RSMA) implementations rely on successive interference cancellation (SIC) at the receiver, whose performance is inherently limited by error propagation during common-stream decoding. This paper addresses this issue by developing a SIC-free RSMA receiver based on joint demapping (JD), which directly evaluates bit vectors over a composite constellation. Using a two-user Multiple-Input Single-Output (MISO) prototype, we conduct over-the-air measurements to systematically compare SIC and JD-based receivers. The results show that the proposed SIC-free receiver provides stronger reliability and better practicality over a wider operating range, with all observations being consistent with theoretical expectations.

Rate-Splitting Multiple Access with a SIC-Free Receiver: An Experimental Study

Abstract

Most Rate-Splitting Multiple Access (RSMA) implementations rely on successive interference cancellation (SIC) at the receiver, whose performance is inherently limited by error propagation during common-stream decoding. This paper addresses this issue by developing a SIC-free RSMA receiver based on joint demapping (JD), which directly evaluates bit vectors over a composite constellation. Using a two-user Multiple-Input Single-Output (MISO) prototype, we conduct over-the-air measurements to systematically compare SIC and JD-based receivers. The results show that the proposed SIC-free receiver provides stronger reliability and better practicality over a wider operating range, with all observations being consistent with theoretical expectations.

Paper Structure

This paper contains 5 sections, 7 equations, 6 figures, 3 tables.

Table of Contents

  1. Introduction
  2. JD-based RSMA System Model
  3. JD-based RSMA Prototype Design and Implementation
  4. Measurement Campaign and Results
  5. Conclusion

Figures (6)

  • Figure 1: SIC-free RSMA prototype block diagram.
  • Figure 2: RSMA measure campaign. User 1 is fixed, while user 2 is shown at Case 4 and can move from Case 1 to Case 6.
  • Figure 3: Measured sum throughput versus private-stream MCS for Case 1 under SIC and JD.
  • Figure 4: Case 1 throughput decomposition: top, JD; bottom, SIC.
  • Figure 5: Four-quadrant decoding outcomes for SIC and JD across Cases 1--6. Left: Cases 1--3. Right: Cases 4--6.
  • ...and 1 more figures