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Asymptotic and Fini...
Asymptotic and Finite Frame Length Analysis of Frame Asynchronous Coded Slotted ALOHA
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- Sandgren, Erik, 1992 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Graell i Amat, Alexandre, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Brännström, Fredrik, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- ISBN 9781509034017
- 2016
- 2016
- Engelska.
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Ingår i: International Symposium on Turbo Codes and Iterative Information Processing, ISTC. - 2165-4700 .- 2165-4719. - 9781509034017 ; 2016-October, s. 81-85
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Abstract
Ämnesord
Stäng
- We consider a frame-asynchronous coded slotted ALOHA (FA-CSA) system where users join according to a Pois- son random process. In contrast to standard frame-synchronous CSA (FS-CSA), when a user joins the system, it transmits a first replica of its message in the following slot and other replicas uniformly at random in a number of subsequent slots. We derive the (approximate) density evolution that characterizes the asymptotic performance of FA-CSA when the frame length goes to infinity. We show that, if the receiver can monitor the system before users start transmitting, a boundary effect similar to that of spatially-coupled codes occurs, which greatly improves the decoding threshold as compared to FS-CSA. We also derive analytical approximations of the error floor (EF) in the finite frame length regime. We show that FA-CSA yields in general lower EF, better performance in the waterfall region, and lower average delay, as compared to FS-CSA.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Kommunikationssystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Communication Systems (hsv//eng)
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- kon (ämneskategori)
- ref (ämneskategori)
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