Capacity Improvement and Analysis of VoIP Service in a Cognitive Radio System

Author

Lee, Howon ; Cho, Dong-Ho

Author_Institution

Inst. for Inf. Technol. Convergence, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

59

Issue

4

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

1646

Lastpage

1651

Abstract

We herein analyze the capacity of voice over IP (VoIP) and propose a new method for finding the minimum detection and false-alarm probabilities to ensure the quality-of-service (QoS) requirement of VoIP users in a cognitive radio system. We propose a model for the system supporting the VoIP service as a 2-D discrete-time Markov chain (DTMC). The VoIP traffic and wireless channels in the cognitive radio system are described as a Markov-modulated Poisson process (MMPP) model and a Markov channel model, respectively. In addition, we introduce a simple spectrum-sensing model based on energy detection. By means of the DTMC approach, we demonstrate various analytical and simulation results under the constraint of imperfect spectrum sensing, such as the packet dropping probability, average throughput, and VoIP capacity.

Keywords

Internet telephony; Markov processes; cognitive radio; quality of service; wireless channels; 2-D discrete-time Markov chain; Markov-modulated Poisson process model; VoIP service; average throughput; cognitive radio system; energy detection; packet dropping probability; quality-of-service; spectrum-sensing model; voice over IP capacity; wireless channels; Cognitive radio; Markov-modulated Poisson process (MMPP); discrete-time Markov chain (DTMC); spectrum sensing; voice-over-IP (VoIP) service;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2009.2039503

Filename

5371859