This paper presents a novel 18-GHz band 16-quadrature amplitude modulation (16-QAM) orthogonal frequency-division multiplexing (OFDM) based 2 ? 2 line-of-sight multi-input multi-output (LoS MIMO) communication system. The system can deliver 356 Mbps at a 56 MHz bandwidth. Amplitude and/or phase alignment mismatch between the transmitter and receiver antennas is examined through hardware experiment. The proposed system uses alignment mismatch compensation method. The open-loop architecture of the proposed compensation method is simple and makes the communication systems easy to construct. In a digital modem, 16-QAM OFDM with 512-point fast Fourier transform (FFT) and (255, 239) Reed-Solomon forward error correction codecs are used. The experimental results show that a bit error rate of 10^(-5) is achieved at a signal-to-noise ratio of about 18.0 dB.
LoS MIMO, OFDM, Mismatch Compensation, Channel Estimation
Cite this :
Bong-Su Kim, Kwang-Seon Kim, Min-Soo Kang, Woo-Jin Byun, Myung-Sun Song, and Hyung Chul Park, "16-QAM OFDM-Based K-Band LoS MIMO Communication System with Alignment Mismatch Compensation," to be published in ETRI Journal, 2017.