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- Title
Performance analysis of wireless multi-user VoIP system with adaptive modulation and coding.
- Authors
Lee, Howon; Lee, Soobin; Cho, Dong-Ho
- Abstract
In this paper, we propose a new framework to analyze performance considering finite-length queuing and adaptive modulation and coding for multi-user Voice over IP (VoIP) services in wireless communication systems. We formulate an uplink VoIP system as a two-dimensional discrete-time Markov chain (DTMC) based on a Markov modulated Poisson process traffic model for VoIP services and modulation and coding scheme (MCS)-level set transition reflecting users' channel variations. We extend the transition modeling of the MCS-level for a single-user to the transition modeling of the MCS-level set for multiple users. Since the users can have various MCS combinations in the case of a multi-user system, the MCS-level set transitions are more complicated than the MCS-level transitions of the single-user case. Throughout our DTMC formulation, we present various performance metrics, such as average queue-length, average throughput, packet dropping probability, packet loss probability, and so on. By using the results of the packet loss probability, we can find an optimum packet error rate value that minimizes the total packet loss probability.
- Subjects
PERFORMANCE evaluation; INTERNET telephony; CODING theory; WIRELESS communications; ADAPTIVE modulation; DATA packeting
- Publication
Wireless Networks (10220038), 2014, Vol 20, Issue 4, p747
- ISSN
1022-0038
- Publication type
Article
- DOI
10.1007/s11276-013-0638-1