Abstract
In this paper, a certain generalization on the slotted collision channel is presented, based on the original work of Massey and Mathys. Our main motivation for this work is applications in a mobile, wireless environment. We are concerned with situations in which, given a collision in the slot the channel capacity becomes a function of the number of users involved. For the superpacket channel, which uses both inner and outer codes in a concatenated fashion (this channel corresponds to the conventional approach), we prove that the removal of feedback does not degrade the system throughput (utilization), but it increases the corresponding delay. On the other hand, the maximum possible utilization can be achieved by employing an inner code alone. We consider some applications of the above schemes with emphasis on Spread-Spectrum systems. We show that in general, Frequency-Hopping systems are ALOHA-limited while Direct-Sequence systems are not ALOHA-limited, achieving an utilization of around 0.6 bit¦sec¦Hz.
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© 1994 Springer-Verlag Berlin Heidelberg
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Ketseoglou, T. (1994). Certain generalizations on the slotted collision channel without feedback. In: Günther, C.G. (eds) Mobile Communications Advanced Systems and Components. IZS 1994. Lecture Notes in Computer Science, vol 783. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-57856-0_44
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DOI: https://doi.org/10.1007/3-540-57856-0_44
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