Multipath Division Multiple Access for High Capacity 5G Millimeter Wave Cellular Systems

Abstract

Future 5G communication systems require more demanding performances than the existing cellular communication systems, e.g., 10 to 100 Mbps user data rate and much larger cellular spectrum efficiency. The well-used multiple access methods like CDMA and OFDMA are hard to achieve these challenging requirements simultaneously even with advanced signal processing techniques and base station cooperation. Recently, massive MIMO has gain much attention since it provides large signal dimensions that can be used to improve future 5G cellular system performance. This tutorial paper describes a recently proposed multiple access scheme called multipath division multiple access (MDMA) based on massive antennas and multipath channel characteristics in millimeter wave band, which offers uniform user data rate and achieves high cellular spectrum efficiency for 5G systems. We describe the fundamental principle and show the uplink and downlink block diagrams, control signaling and the call setup process. Besides, benefits of using MDMA as a multiple access scheme are discussed. Finally, practical concerns are addressed for future research directions.

A Comparison Between Tone-Based and Code-Based Cell Search Schemes for Multipath Division Multiple Access

“…1, where M is the number of BS antennas. The details are revealed in [24] [25] for readers of interest. In brief, the benefits of using MDMA are channel hardening, uniform data rate, high cellular capacity, spatial focus beamforming, and hybrid multiple access.…”

“…The processing gain derived from massive BS antennas is used to suppress both intra-cell and inter-cell interferences. Besides, the MDMA is interference limited with power control [25]. In addition, control channels are designed in both time and frequency domains.…”