OFDM-IDMA Uplink Multi-user System with Scalable Latency for Next Generation WLAN

Leonardo Alisasis Lanante; Nguyen Tran Thi Thao; Yuhei Nagao; Hiroshi Ochi

doi:10.25042/epi-ije.022020.06

Leonardo Alisasis Lanante Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology
Nguyen Tran Thi Thao Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology
Yuhei Nagao Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology
Hiroshi Ochi Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology

DOI: https://doi.org/10.25042/epi-ije.022020.06

Keywords: 802.11ax, IDMA, Uplink Multi-User Access

Abstract

In this paper, we propose an Interleave-Division Multiple Access (IDMA) based uplink multi-user system fornext generation WLAN. By minimizing the latency throughaccurate detection per iteration, we were able to design a receiver architecture that meets the latency demands of current IEEE802.11 WLAN. To do this, the proposed system utilizes a novel algorithm for simplified LLR calculation of the soft input soft output demapper needed in the IDMA first stage detection.The proposed system has a maximum of 34.8 bits/s/Hz spectral efficiency for a single spatial stream and can support up to 8 users in a single 20MHz channel. We compare the proposed system to a reference OFDMA system and show its advantages in terms of diversity, flexibility and BER performance.

Keywords: 802.11ax; IDMA; uplink multi-user access