In recent years, with the rapid deployment of 5G and the planning for future 6G multi-network convergence, interest in optical wireless communication (OWC) technology as a promising complementary technology to Radio Frequency (RF) technology has gained new impetus. In this paper, aiming at the OWC communication system, an indoor OWC channel measurement testbed is built to measure the infrared (IR) channel under the testbed and evaluate its communication performance. Through experiments, the channel response of the IR device is measured. The OWC channel measurement testbed can achieve a data rate above 16Mbps, with the minimum value of Error Vector Magnitude (EVM) 18.8338%, and the minimum value of Bit Error Ratio (BER) 0.0301. According to the Digital Cinema System Specification (DCSS) issued by Digital Cinema Initiatives (DCI), the system meets the transmission standard of 4K radio.