Mobile communications toward the fifth generation (5G) have been popularly discussed and investigated worldwide in academia and industry. 5G, as an evolution from the previous generations, demands both high system capacity and high data rate. A novel multiple access scheme based on millimeter wave transmission and massive antennas at a base station (BS), named multipath division multiple access (MDMA), is proposed in this paper to be a future 5G possible solution. MDMA is defined here as a method to use massive antennas at BS to achieve a processing gain to suppress multiple access interference (MAI) in cellular mobile radio system. The processing gain is obtained by implementing RAKE receivers at BS. The system concept is also demonstrated by computer simulations. Moreover, it has been shown through simple but crucial analysis that the system capacity and the aggregated data throughput could be boosted up to a considerable level.