A 16-QAM 45-Gbps 7-m wireless link using InP HEMT LNA and GaAs SBD mixers at 220-GHz-band

This paper presents a 220-GHz-band 7-m wireless link with a 45-Gbps transmission data rate by using 16 quadrature amplitude modulation (16-QAM). Super-heterodyne transceiver modules are developed for transmission and reception of the modulated signals, which consist of a Schottky barrier diodes (SBD) based sub-harmonic mixer (SHM), an InP HEMT low noise amplifier (LNA), a waveguide band-pass filter (BPF), and a 108-GHz local oscillator (LO) multiplier chain. The transmitter features a peak transmit power of 1.41 dBm, and the IF frequency varies from 5 GHz to 20 GHz. Besides, the receiver features a conversion gain of 9.3 dB in average and a noise temperature of 3052.8 K. The measured results indicate that the transceiver modules enable data transmission of a 45-Gbps 16-QAM signal with Signal-Noise-Ratio (SNR) from 11.59 dB to 15.36 dB in a 7-m line-of-sight channel.