Capacity evaluation of the OFDMA-CDMA ranging subsystem in IEEE 802.16-2004

You, Jaegeon; Kim, Kanghee; Kim, Kiseon

doi:10.1109/wimob.2005.1512823

Cited by 4 publications

References 12 publications

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Performance Modelling of TXOP Differentiation in Infrastructure-Based WLANs

Peyre

El-Azouzi

2007

32nd IEEE Conference on Local Computer Networks (LCN 2007)

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Two-dimensional numerical simulations indicate that a surface-potential bending greater than the Si-film Fermi potential is required to reach the threshold condition for the near-intrinsic thinfilm SO1 MOSFET's. Additionally, both n-and p-type SO1 films result intrinsic state and fully depleted condition. The threshold voltages of these devices are mainly dependent on the work function of gate ma-process complexity and cost. Further shrinkage in device dimensions may require a reduction in power supply voltage. The device threshold voltage has to be scaled acity. As a Rsult of reducing the threshold voltage, the offstate leakage current is increased. in approximately the Same device threshold voltage when in the near-cordingly to maintain the gain in current driving capabi1terial. High-performance submicrometer near-intrinsic thin-film SO1 complementary MOSFET's with balanced threshold voltages of about 0.4 V (negative for PMOSFET's) are achievable with proper selection of gate material and back-gate bias. The devices are relatively insensitive to process variations and short-channel effects when compared to their bulk silicon counterparts. For very thin (less than 100 nm) SO1 films, drain-induced barrier lowering (DIBL) is not sufficient to cause degradation of threshold voltage or punchthrough behavior in the submicrometer region. For relatively thick (greater than 100 nm) SO1 films, DIBL becomes more pronounced but can be suppressed by a proper back-gate bias. The simulated front-gate linear transconductance remains nearly constant up to about loi5and then falls off rapidly with increasing doping concentration because of mobility degradation. The subthreshold slope increases with decreasing channel length, increasing SO1 film thickness, and increasing drain voltage as a result of DIBL, but the increase is small for very thin SO1 films.

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Performance Modelling of TXOP Differentiation in Infrastructure-Based WLANs

Peyre

El-Azouzi

2007

32nd IEEE Conference on Local Computer Networks (LCN 2007)

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QoS differentiation for initial and bandwidth request ranging in IEEE802.16

Peyre

El-Azouzi

Chahed³

2008

2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications

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The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

Kobbane

El-Azouzi

Ibrahimi

et al. 2010

CIT

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International audienceIn this paper we study the capacity of wireless cellular network, in particular the uplink of WCDMA system by using the two dimensional continuous-time Markov chain (CTMC) technique. Considering two types of calls: real-time (RT) calls characterized by a quasi fixed transmission rate, and best-effort (BE) calls which do not require strict demand but need some reliability conditions, we develop an approach based on the spectral analysis for evaluating the cell capacity. We explicitly obtain the simultaneous distribution of the number of RT connections and the number of BE connections in the steady-state. This analysis allows us to simplify the computation of the performance measures including expected delay and throughput of BE traffic. These performances are obtained explicitly in both cases (finite and infinite) of BE calls as function of system parameters like arrival rate of BE and RT calls, service rate of BE and RT calls. These results allow the operator to evaluate the cell capacity by varying these parameters independently of the number of BE calls according to its policy to manage the network. We further propose some CAC (Call Admission Control) policies for BE traffic. We finally conclude this work with some numerical and simulation results. The simulation results obtained by the network simulator (NS2) are closely related to the numerical results of our analytical results which validate our theoretical model

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Capacity evaluation of the OFDMA-CDMA ranging subsystem in IEEE 802.16-2004

Cited by 4 publications

References 12 publications

Performance Modelling of TXOP Differentiation in Infrastructure-Based WLANs

Performance Modelling of TXOP Differentiation in Infrastructure-Based WLANs

QoS differentiation for initial and bandwidth request ranging in IEEE802.16

The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

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