Experimental results of the multi-Gbps smartphone with 20 multi-input multi-output (MIMO) antennas in the 20 x 12 MIMO operation

It is experimentally demonstrated that 20 multi-input multi-output (MIMO) antennas operated in 3.5-GHz band (3400 approximate to 3600 MHz) with acceptable antenna performance and low envelope correlation coefficients (ECCs<0.1) can be embedded in the smartphone for fifth-generation (5G) or future mobile communications. Additionally, in a 20 x 12 MIMO system with 12 transmitted MIMO streams, it is shown that the 20-antenna smartphone as a receiver can achieve 5.5-Gbps data throughput with 100-MHz bandwidth (3450 approximate to 3550 MHz). That is, the smartphone can have a spectral efficiency of 55 bps/Hz. With the user's hand holding the 20-antenna smartphone, about 5.3-Gbps data throughput in the 20 x 12 MIMO operation can still be obtained, indicating that stable multi-Gbps smartphone is promising to obtain. Details of the 20-antenna smartphone for MIMO operation are described. Experimental results of the 20-antenna smartphone in the 20 x 12 MIMO operation including the user's hand presence scenario are also presented and discussed.