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Capacity Performance Analysis of M-ary PPM TH-UWB Systems in the Presence of Narrowband Interference
Kokkalis, Nikos V.,Mathiopoulos, P. Takis,Karagiannidis, George K.,Koukourlis, Christos S. The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.3
The capacity of ultra-wideband (UWB) systems in presence of narrowband interference (NBI) is studied. By appropriately modifying the Shannon capacity formula, an analytical expression for the capacity of M-ary pulse position modulation (PPM) signals in the presence of NBI is obtained. Performance evaluation results for the capacity of such signals as a function of the NBI carrier frequency and power are also presented.
Capacity Performance Analysis of M-ary PPM TH-UWB Systems in the Presence of Narrowband Interference
Nikos V. Kokkalis,P. Takis Mathiopoulos,George K. Karagiannidis,Christos S. Koukourlis 한국통신학회 2008 Journal of communications and networks Vol.10 No.3
The capacity of ultra-wideband (UWB) systems in presence of narrowband interference (NBI) is studied. By appropriately modifying the Shannon capacity formula, an analytical expression for the capacity ofM-ary pulse position modulation (PPM) signals in the presence of NBI is obtained. Performance evaluation results for the capacity of such signals as a function of the NBI carrier frequency and power are also presented.
Ioannis D Papanastassiou,Mohamed Eleraky,Ryan Murtagh,Zinon T Kokkalis,Maria Gerochristou,Frank D Vrionis 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.3
Study Design: Retrospective comparative study and technical note. Purpose: To determine if there is a difference in clinical and radiographic parameters between unilateral and bilateral kyphoplasty in a uniform cancer population and to stress the importance of preoperative planning. Overview of Literature: While unipedicular kyphoplasty is gaining popularity, a few comparative studies have reported on superior kyphotic reduction with the bipedicular approach. Methods: We reviewed 69 myeloma patients with 105 operated levels (51 levels were done bilaterally vs. 54 unilaterally). Pain reduction, height restoration, cement volume and complications were recorded up to three months postoperatively. A technical note to identify the skin entry point on the basis of the magnetic resonance imaging and fluoroscopy (lateral view) is being described. Results: Both procedures resulted in significant pain reduction (5.4–5.6/10 points, p =0.8). There was significant height restoration after the operation (p <0.001), while there was no sustained difference between the procedures (p =0.5) up to three months postoperatively. More cement was injected in the bilateral group (4.1 mL vs. 4.9 mL, p =0.002); no difference in cement extravasation in the spinal canal was observed (p =0.5). Conclusions: There was no difference in the clinical or radiological outcomes between the unilateral and bilateral approaches. Therefore, unilateral kyphoplasty may be performed whenever it is technically feasible and this may be determined preoperatively.