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RISS 인기검색어
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- 저자 : Gutierrez Raymundo (검색결과 2 건)
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Generalized Quadrature Spatial Modulation Scheme Using Antenna Grouping
Francisco Ruben Castillo-Soria,Joaquın Cortez-Gonzalez,Raymundo Ramirez-Gutierrez,Fermın Marcelo Maciel-Barboza,Leonel Soriano-Equigua 한국전자통신연구원 2017 ETRI Journal Vol.39 No.5
This paper presents a novel generalized quadrature spatial modulation (GQSM) transmission scheme using antenna grouping. The proposed GQSM scheme combines QSM and conventional spatial multiplexing (SMux) techniques in order to improve the spectral efficiency (SE) of the system. Analytical and simulation results show that the proposed transmission scheme has minimal losses in terms of the average bit error probability along with the advantage of an increased SE compared with previous SM and QSM schemes. For the case studies, this advantage represents a reduction of up to 81% in terms of the number of required transmit antennas compared with QSM. In addition, a detection architecture based on the ordered successive interference cancellation scheme and the QR decomposition is presented. The proposed QRD-M adaptive algorithm showed a near-maximum-likelihood performance with a complexity reduction of approximately 90%.
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Harvest index is a key trait for screening drought-tolerant potato genotypes (Solanum tuberosum)
Lozano-Isla Flavio,Farfan-Vignolo Evelyn Roxana,Gutierrez Raymundo,Blas Raul,Awais Khan 한국작물학회 2024 Journal of crop science and biotechnology Vol.27 No.1
Drought stress is a significant constraint that affects the yield of almost all major crops. Its impact is expected to worsen due to global climate change and human population expansion. Potato (Solanum tuberosum L.) is the third most important food crop worldwide, but it is highly susceptible to drought stress. In order to understand the effects of drought stress on yield and identify traits for selecting drought-tolerant potato genotypes, we evaluated the response of a range of agronomic and physiological traits in 15 potato genotypes under well-watered (WW) and water deficit (WD) conditions. The harvest index (HI) was found to have a high plot-based heritability (0.98), indicating that it can be used for the indirect selection of drought-tolerant genotypes. In contrast, SPAD was sensitive to detecting early drought stress in potatoes. Drought-tolerant genotypes, including CIP392797.22 (UNICA), CIP397077.16, CIP398190.89, CIP398208.219, and CIP398208.620, were able to allocate limited water towards tuber production rather than biomass. These genotypes showed high tuber production under WW conditions and increased photosynthetic activity and water use efficiency under WD conditions.
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