Massive MIMO increasing capacity and spectral efficiency
Multi-antenna transmission already plays an important role in current generations of mobile communication and will be even more central in the 5G era.
Single-user MIMO, and Multi-user MIMO are Massive MIMO implementations to increase user data speeds and system capacity to meet 5G standards. Single-user MIMO (SU-MIMO), and Multi-user MIMO (MU-MIMO) leverage Massive MIMO by dynamically transmitting data as highly-focused beams and exploiting multipath propagation and spatial multiplexing to simultaneously send and receive more than one data signal over the same radio channel. By beam steering a highly-focused beam, a stronger radio signal with higher data throughput is delivered over a greater distance using less energy.
In Single-user MIMO, multiple data signals can be sent to a single user. Multi-user MIMO further increases capacity by enabling multiple users to simultaneously utilize the same time and frequency resources. In practice, Multi-user MIMO dynamically switches between Single-user MIMO and Multi-User MIMO - depending upon network conditions and the application requirements - in addition to modifying the number and shape of the beams to deliver excellent performance to each network user.
In summary, Single-user MIMO, and Multi-User MIMO both improve the end user experience, and significantly increases the network capacity and coverage while reducing interference. Through the intelligent reuse of system resources, Multi-user MIMO further increases capacity by transmitting data to multiple user devices using the same time and frequency resources with coordinated beam forming and beam steering.