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

In this paper, we propose an Interleave-Division Multiple Access (IDMA) based uplink multi-user system for next generation WLAN. By minimizing the latency through accurate detection per iteration, we were able to design a receiver architecture that meets the latency demands of current IEEE 802.11 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.