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학술지 16-QAM OFDM-Based K-Band LoS MIMO Communication System with Alignment Mismatch Compensation
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저자
김봉수, 김광선, 강민수, 변우진, 송명선, 박형철
발행일
201708
출처
ETRI Journal, v.39 no.4, pp.535-545
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.17.0116.0464
협약과제
16MR2200, (통합)모바일 빅뱅 시대의 주파수 효율 개선 핵심 기술 개발, 최형도
초록
This paper presents a novel K-band (18 GHz) 16- quadrature amplitude modulation (16-QAM) orthogonal frequency-division multiplexing (OFDM)- based 2 3 2 line-of-sight multi-input multi-output communication system. The system can deliver 356 Mbps on a 56 MHz channel. Alignment mismatches, such as amplitude and/or phase mismatches, between the transmitter and receiver antennas were examined through hardware experiments. Hardware experimental results revealed that amplitude mismatch is related to antenna size, antenna beam width, and link distance. The proposed system employs an alignment mismatch compensation method. The openloop architecture of the proposed compensation method is simple and enables facile construction of communication systems. In a digital modem, 16-QAM OFDM with a 512-point fast Fourier transform and (255, 239) Reed-Solomon forward error correction codecs is used. Experimental results show that a bit error rate of 10-5 is achieved at a signal-to-noise ratio of approximately 18.0 dB.
키워드
Channel estimation, Los MIMO, Mismatch compensation, OFDM
KSP 제안 키워드
16 quadrature amplitude modulation(16QAM), 18 GHz, 6 MHz, Beam width, Bit Error Rate(And BER), Channel estimation(CE), Compensation method, Fast Fourier transform, Forward error correction(FEC), K-band, LOS MIMO