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학술대회 Performance Comparison of Equalization Schemes for OTFS over Time-Varying Multipath Channels
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신우람, 김경표, 고영조
International Conference on Information and Communication Technology Convergence (ICTC) 2020, pp.1433-1438
20HH1500, [전문연구실] 초정밀 서비스 실현을 위한 On-Time·On-Rate 무선액세스 및 광에지 클라우드 네트워킹 핵심기술 개발, 고영조
In this paper, simple linear equalization schemes in time-frequency (TF) and delay-Doppler (dD) domains for orthogonal time frequency space (OTFS) are investigated, and their demapping is concretely derived to adhere to channel coding by taking effective desired channel, effective residual interference, and effective noise, capturing demodulation and equalization, into account. The BLER performance shows that OTFS with TF-domain minimum mean squared error (MMSE) (TF-MMSE) and dD-domain MMSE (dD-MMSE) can achieve higher diversity order than that of CP-OFDM with TF-ZF in varied types of channel: i) high delay spread and low mobility in non-line-of-sight, ii) medium delay spread and high mobility in line-of-sight (LoS), and iii) low delay spread and very high mobility in LoS. It is observed from numerical link level simulations that OTFS with TF-MMSE and dD-MMSE can achieve superior BLER performance compared to CP-OFDM with TF-ZF in all the channel scenarios, but there is a cross-over point where it is started that OTFS becomes better than CP-OFDM in terms of BLER performance in the first channel type. Also, matched filter bound with iterative demapping and decoding for OTFS is drawn to provide lower bounds in BLER performance and to compare diversity order with those of TF-MMSE and dD-MMSE for OTFS.
KSP 제안 키워드
CP-OFDM, Channel Coding, Channel type, Delay spread, Diversity Order, High Delay, High Mobility, Line-Of-Sight(LOS), Link level simulation, Low Delay, Low mobility