This paper presents ATSC 3.0 physical (PHY) layer modulation and coding performance through computer simulations, laboratory tests, and field trials. Analysis results show that the measured results in laboratory and field are generally well aligned with computer simulation results. The ATSC 3.0 PHY layer performance covers ultra-robust reception (negative SNR operation with QPSK and 2/15 LDPC code) to very high-throughput (over 50 Mbps with 4096-NUC with 13/15 LDPC code) in real field environment.