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8. Influence of channel parameters on noncoherent massive MIMO systems

Author

Bucher, S., Yammine, G., Fischer, R. F. H., and Christian Waldschmidt

Subjects
Multi-user, Multi-user dungeons, 020302 automobile design & engineering, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, MIMO systems, Detection, MIMO, 0203 mechanical engineering, Radar, Automatic detection, DDC 620 / Engineering & allied operations, MUD, Detektion, ddc:620, Massive MIMO, Uplink, Computer Science::Information Theory
Abstract

In multi-user massive MIMO uplink systems, noncoherent detection schemes offer an appealing alternative to classical coherent detection algorithms. Sorted decision-feedback differential detection (DFDD) in combination with noncoherent decision-feedback equalization (nDFE) over the users have been demonstrated to achieve comparable results to the coherent case. Up to now, the assessment of noncoherent detection has been performed on the basis of an idealized channel model. In this paper, the influence of channel parameters on the performance of noncoherent massive MIMO systems is analyzed via an extensive simulation study. Thereby, a realistic channel model, in particular the COST 2100 channel model, forms the basis for the evaluation. It is shown that performance is highly dependent on the actual channel settings as well as on the power control of the transmitter. A further outcome is that the idealized channel model in previous studies ignores correlation effects and exhibits other power distributions among the receiving antennas. As a consequence, further optimization steps for noncoherent detection are required., acceptedVersion

10. [Cholecystectomies at the Saint-George Hospital. Apropos of 672 operations performed, 1982-1991].

Author

Daher M, Yammine G, and Nassif K

Subjects
Age Factors, Aged, Aged, 80 and over, Anti-Bacterial Agents therapeutic use, Cholangiography, Cholecystitis surgery, Cholelithiasis surgery, Female, Humans, Male, Middle Aged, Postoperative Complications, Premedication, Retrospective Studies, Surgical Wound Infection prevention & control, Cholecystectomy mortality
Abstract

In a retrospective study of a 10-year period (1982-1991), the results of 672 consecutive operations for cholecystectomy were analyzed. 67.7% were females and the medium age was 54.4%. Ultrasound is used to be the test of choice and surgery was done for chronic cholecystitis in 79.9% and in 20.1% for acute cholecystitis. With an overall mortality rate of 1.9% and a morbidity of 16%, conventional cholecystectomy proved to be a safe method. Mortality and morbidity seem to be related to age (> 60 years, median age 70.5), sex (men = 70%), and associated procedures (choledochotomy with exploration, sphincterotomy, biliary derivation). Systematic antibiotic prophylaxis and non drainage of the sub-hepatic area in certain cases lowered the incidence of wound infection, and improved post-operative course. Selective operative cholangiogram also improved per and post-operative course and does not seem to increase the incidence of residual stones. Now, only the new laparoscopic cholecystectomy may represent the alternative to the ideal treatment of cholecystolithiasis.

Published
1993

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