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Efficient detectors for MIMO‐OFDM systems under spatial correlation antenna arrays
David William Marques Guerra,Rafael Masashi Fukuda,Ricardo Tadashi Kobayashi,Taufik Abrão 한국전자통신연구원 2018 ETRI Journal Vol.40 No.5
This work analyzes the performance of implementable detectors for the multiple‐input multiple‐output (MIMO) orthogonal frequency division multiplexing (OFDM) technique under specific and realistic operation system conditions, including antenna correlation and array configuration. A time‐domain channel model was used to evaluate the system performance under realistic communication channel and system scenarios, including different channel correlation, modulation order, and antenna array configurations. Several MIMO‐OFDM detectors were analyzed for the purpose of achieving high performance combined with high capacity systems and manageable computational complexity. Numerical Monte Carlo simulations demonstrate the channel selectivity effect, while the impact of the number of antennas, adoption of linear against heuristic‐based detection schemes, and the spatial correlation effect under linear and planar antenna arrays are analyzed in the MIMO‐OFDM context.
Kosaku Nanki,Shinta Mizuno,Katsuyoshi Matsuoka,Keiko Ono,Shinya Sugimoto,Hiroki Kiyohara,Mari Arai,Moeko Nakashima,Kozue Takeshita,Keiichiro Saigusa,Mitsutoshi Senoh,Tadashi Fukuda,Makoto Naganuma,Har 대한장연구학회 2018 Intestinal Research Vol.16 No.1
Fecal microbiota transplantation (FMT) has been reported as a safe and effective therapy in patients with refractory and recurrentClostridium difficile infection (CDI). FMT has also been reported as a promising therapy in patients with ulcerative colitis(UC). Both, CDI and UC, are believed to be caused by dysbiosis, such as altered compositions or decreased diversity of the intestinal microbiota. This report describes a patient with UC in remission with a second recurrent episode of CDI, who was treated with FMT. A single FMT performed via colonoscopy completely resolved the patient’s diarrhea and eradicated C. difficilebacteriologically without any severe complications. Molecular biological analysis of the patient’s fecal microbiota showedthat FMT could dramatically change the altered composition of intestinal microbiota and restore its diversity. Despite the restoration of the intestinal microbiota, FMT could not prevent a relapse of UC in this patient. However, it improved the intestinalsymptoms of CDI and could prevent further recurrences of CDI.