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Analysis of RF transceiver for 5G applications

This paper introduces a new place for Band pass filter (BPF) in RF transceiver (TRx) system operating in Time Division Duplex (TDD) mode. The analysis is performed in the viewpoint of accommodating a huge number of transceivers for 5G massive MIMO systems for base station as well as user equipment. Location of the BPF in the transceiver is optimized by evaluating the overall system selectivity and out-of-band noise suppression. Placing the BPF near to the antenna, before the T/R switch has a significant impact on the overall transceiver performance. This paper also highlights the improvement in the selectivity of the filter by cascading a two BPFs of very low cost and moderate specifications. Simulation results indicate that a better roll-off of about 30-40 dB is achieved with two cascaded BPFs.