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RISS 인기검색어
- 검색키워드
- 저자 : Jeffrey E. Wieselthier (검색결과 3 건)
- 무료
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Circuit-Switched “Network Capacity” under QoS Constraints
Wieselthier, Jeffrey E.,Nguyen, Gam D.,Ephremides, Anthony The Korea Institute of Information and Commucation 2002 Journal of communications and networks Vol.4 No.3
Usually the network-throughput maximization problem for constant-bit-rate (CBR) circuit-switched traffic is posed for a fixed offered load profile. Then choices of routes and of admission control policies are sought to achieve maximum throughput (usually under QoS constraints). However, similarly to the notion of channel “capacity,” it is also of interest to determine the “network capacity;” i.e., for a given network we would like to know the maximum throughput it can deliver (again subject to specified QoS constraints) if the appropriate traffic load is supplied. Thus, in addition to determining routes and admission controls, we would like to specify the vector of offered loads between each source/destination pair that “achieves capacity.” Since the combined problem of choosing all three parameters (i.e., offered load, admission control, and routing) is too complex to address, we consider here only the optimal determination of offered load for given routing and admission control policies. We provide an off-line algorithm, which is based on Lagrangian techniques that perform robustly in this rigorously formulated nonlinear optimization problem with nonlinear constraints. We demonstrate that significant improvement is obtained, as compared with simple uniform loading schemes, and that fairness mechanisms can be incorporated with little loss in overall throughput.
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Communication-Theoretic Analysis of Capture-Based Networks
Gam D. Nguyen,Jeffrey E. Wieselthier,Anthony Ephremides 한국통신학회 2012 Journal of communications and networks Vol.14 No.3
Under the power-based capture model, a transmission is successfully received at the destination, even in the presence of other transmissions and background noise, if the received signal-to-interference-plus-noise ratio exceeds a capture threshold. We evaluate the spectral efficiency of simple multi-user channels by combining the basic capture model with a communicationtheoretic model. The result is a more refined capture model that incorporates key system design parameters (such as achievable bit rate, target bit error rate, channel bandwidth, and modulation signal constellations) that are absent from the basic capture model. The relationships among these parameters can serve as a tool for optimizing the network performance.
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Communication-Theoretic Analysis of Capture-Based Networks
Nguyen, Gam D.,Wieselthier, Jeffrey E.,Ephremides, Anthony The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.3
Under the power-based capture model, a transmission is successfully received at the destination, even in the presence of other transmissions and background noise, if the received signal-to-interference-plus-noise ratio exceeds a capture threshold. We evaluate the spectral efficiency of simple multi-user channels by combining the basic capture model with a communication-theoretic model. The result is a more refined capture model that incorporates key system design parameters (such as achievable bit rate, target bit error rate, channel bandwidth, and modulation signal constellations) that are absent from the basic capture model. The relationships among these parameters can serve as a tool for optimizing the network performance.
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