## An Efficient Subcarrier and Power Allocation Algorithm For Dual-Service Provisioning in OFDMA Based WiBro Systems (2005)

Venue: | ICOIN 2005 – International Conference on Information Networking, LNCS 3391 |

Citations: | 1 - 1 self |

### BibTeX

@INPROCEEDINGS{Anas05anefficient,

author = {Mohmmad Anas and Kanghee Kim and Jee Hwan Ahn and Kiseon Kim and Jee Hwan Ahn and Kiseon Kim},

title = {An Efficient Subcarrier and Power Allocation Algorithm For Dual-Service Provisioning in OFDMA Based WiBro Systems},

booktitle = {ICOIN 2005 – International Conference on Information Networking, LNCS 3391},

year = {2005},

pages = {725--734},

publisher = {Springer-Verlag}

}

### OpenURL

### Abstract

This paper investigates the problem of resource allocation for quality of service (QoS) support in Orthogonal Frequency Division Multiple Access (OFDMA) based WiBro systems. We identify the key QoS parameters as data rate and bit error rate (BER), which are used to determine the individual traffic demands. We propose a resource allocation algorithm to provide dual-service, Guaranteed Performance (GP) and Best Effort (BE) differentiated on the basis of required QoS. Subcarrier assignment and power allocation are carried out sequentially to reduce the complexity, and GP users are given priority over BE users in assigning subcarrier and allocating power. We present the simulation results of the proposed algorithms applied to frequency selective Rayleigh fading channel with additive white Gaussian noise (AWGN) and OFDMA.

### Citations

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Citation Context ...’s n th subcarrier. Assuming the M-ary quadrature amplitude modulation (MQAM) and ideal phase detection the data rate of user k is viewed as the sum of the user’s subcarriers data rate, as derived in =-=[10]-=-. Hence, the data rate of user k in an OFDMA system is represented by, Rk = B N � n∈Ωk log 2 (2) � 1 + pk,nHk,n � bps (3) Γ where, Ωk is the set of subcarriers allocated to user k and is assumed to be... |

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Citation Context ...near programming technique [6], which requires high complexity to be implemented in practical. So far several suboptimal algorithms have been proposed to solve the problem such as iterative method in =-=[7]-=- and heuristic methods in [6][8]. In [9], an optimal power allocation is proposed for a determined subcarrier assignment scheme to satisfy each user’s data rate proportionally. In this paper, we consi... |

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Citation Context ...the proposed algorithms. Section 5 contains the concluding remarks. 2 System Model and Problem Formulation A schematic diagram of an OFDMA based WiBro system used in this paper is shown in Fig. 1. [1]=-=[3]-=-. In the figure, K denotes the total number of userssBase Station Transmitter User 1, R 1 User 2, R 2 .…. User K, R K Receiver for User 1 Receiver for User 2 Receiver for User K A/D and remove cyclic ... |

53 |
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(Show Context)
Citation Context ...s paper, we consider the resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA), which is a modulation and multiple access method for WiBro systems based on IEEE 802.16a =-=[2]-=-, to provide service to heterogeneous users. Different broadband services require different amount of rates and different priorities [4]. For example, it requires more bandwidth to provide video servi... |

49 |
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Citation Context ...which requires high complexity to be implemented in practical. So far several suboptimal algorithms have been proposed to solve the problem such as iterative method in [7] and heuristic methods in [6]=-=[8]-=-. In [9], an optimal power allocation is proposed for a determined subcarrier assignment scheme to satisfy each user’s data rate proportionally. In this paper, we consider two types of users, Guarante... |

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Citation Context ...is a convex function of power and can be solved using Lagrangian multiplier techniques [13]. The optimal power allocation solution comes out to be well known waterfilling solution in frequency domain =-=[12]-=-. The price for the optimal solution is obviously the computational time and complexity, which makes them impractical for real-time systems. In the following subsections we present a subcarrier assign... |

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Citation Context ...ents, we formulate our problem so as to maximize the sum-capacity of BE users for a given BER while satisfying the data rate and BER requirements of all the GP user’s under the total power constraint =-=[11]-=-. Hence, the general optimization problem of interest can be expressed as, max K� � pk,n ,Ωk k=K1+1 n∈Ωk subject to: � n∈Ωk K� B N log 2 � k=1 n∈Ωk B N log � 2 1 + pk,nHk,n � Γ2 � 1 + pk,nHk,n � = Rk ... |

5 |
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Citation Context ...ese diverse requirements network designer may choose to support a variety of services with guaranteed QoS and high bandwidth utilization while servicing maximum number of users.sSo far several papers =-=[5]-=--[9] have dealt with the problem of adaptive resource allocation in multiuser Orthogonal Frequency Division Multiplexing (OFDM) system under various constraints. When the requirements for each user’s ... |

4 | QoS aware power allocation for combined guaranteed performance and best effort users
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(Show Context)
Citation Context ...called GP services. On the other hand, applications which are less sensitive to instantaneous variations in available bandwidth and do not require guarantees on the throughput, are called BE services =-=[13]-=-. In this context, we propose an efficient subcarrier and power allocation algorithm to provide dual-service (GP and BE) differentiated on the basis of required rate and BER in an OFDMA system. Ideall... |

2 |
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Citation Context ... more complex to be analytically solved as compared to when there is no constraint on each user’s data rate and BER [5]. The problem in this case should be solved by a nonlinear programming technique =-=[6]-=-, which requires high complexity to be implemented in practical. So far several suboptimal algorithms have been proposed to solve the problem such as iterative method in [7] and heuristic methods in [... |

1 |
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Citation Context ... multiple access method for WiBro systems based on IEEE 802.16a [2], to provide service to heterogeneous users. Different broadband services require different amount of rates and different priorities =-=[4]-=-. For example, it requires more bandwidth to provide video service than one for data service, and in general voice service is given higher priority than either a data or a video service. In response t... |