Multi-User Capacity for Cyclic Prefix Direct Sequence Spread Spectrum with Linear Detection and Precoding

Conference · Mon Feb 15 04:00:00 EST 2021

OSTI ID:1819951

Kenney, Brent A. ^[1]; Majid, Arslan J ^[2]; Moradi, Hussein ^[2]; Farhang-Boroujeny, Behrouz ^[3]

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1. University of Utah PhD student
2. Idaho National Laboratory
3. University of Utah professor

Cyclic Prefix Direct Sequence Spread Spectrum (CP-DSSS) is a promising solution for futuristic 6G ultra-reliable low latency communications (URLLC) and massive machine type communication (mMTC) applications, where the CP-DSSS waveform would operate as a secondary network at the same frequencies as the primary network but at much lower SNR. In this paper, we show per-user capacity for multi-user scenarios, where simple matched filtering (MF) is performed on the uplink (UL) and time-reversal (TR) precoding is used on the downlink (DL). When operating in the low SNR regime, CP-DSSS achieves per-user capacity near the optimum single-user capacity by using a MF detector at the receiver for the UL. TR precoding converges to the optimal capacity as the number of antennas at the hub/gateway increases. Given the near-optimal performance of MF detection and TR precoding for each of the users, CP-DSSS can be implemented with simple device transceiver structures, reducing per-unit cost for massively deployed 6G networks.

• Research Organization: Idaho National Laboratory (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 1819951
• Report Number(s): INL/CON-20-57149-Rev000
• Country of Publication: United States
• Language: English

Related Subjects

5G and Beyond Communications
99 GENERAL AND MISCELLANEOUS
CP-DSSS
Capacity
Filter-bank Multi-Carrier Spread Spectrum System
Internet of Things
Massive Machine-Type Communications
Multi-User Access Control
Wireless Communications