An ODMA-Based Unsourced Random Access Scheme with a Multiple Antenna Receiver

TL;DR

This paper proposes an ODMA-based unsourced random access scheme with multiple antennas, employing on-off-division multiple access and iterative detection to improve performance in multi-antenna base stations.

Contribution

It introduces a novel unsourced random access method combining ODMA with multiple antennas and iterative detection, outperforming existing schemes.

Findings

Superior performance over state-of-the-art methods

Effective pilot and pattern detection with iterative decoding

Enhanced reliability in multi-antenna settings

Abstract

We investigate the unsourced random access scheme assuming that the base station is equipped with multiple antennas, and propose a high-performing solution utilizing on-off-division multiple access. We assume that each user spreads its pilot sequence and polar codeword to the pilot and data parts of the transmission frame, respectively, based on a transmission pattern. The iterative receiver operation consists of pilot and pattern detection followed by channel vector and symbol estimation, polar decoding, and successive interference cancellation. Numerical findings demonstrate that the proposed scheme has superior performance compared to the state-of-the-art in various antenna settings.