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Cyclic Prefix Direct Sequence Spread Spectrum (CP-DSSS) is a promisingsolution for futuristic 6G ultra-reliable low latency communications (URLLC)and massive machine type communication (mMTC) applications. We propose that insuch applications, the CP-DSSS waveform would operate as a secondary network atthe same frequencies as the primary network but at much lower SNR. In thispaper, we evaluate per-user capacity of CP-DSSS when simple matched filtering(MF) is performed on the uplink (UL) and time-reversal (TR) precoding is usedon the downlink (DL). In this setting when operating in the low SNR regime,CP-DSSS achieves a per-user capacity that is near the optimum single-usercapacity. TR precoding converges to the optimal capacity as the number ofantennas at the hub/gateway increases. Using the estimated channel impulseresponse for MF and TR introduces little to no capacity loss. Given thenear-optimal performance of MF detection and TR precoding for each of theusers, CP-DSSS can be implemented with simple device transceiver structures,reducing per-unit cost for massively deployed 6G networks.

Multi-user Capacity of Cyclic Prefix Direct Sequence Spread Spectrum with Linear Detection and Precoding