Subcarrier and bit allocation strategies for OFDMA based wireless ad hoc networks

Kulkarni, G.; Srivastava, Mani

doi:10.1109/glocom.2002.1188048

Cited by 24 publications

(21 citation statements)

References 9 publications

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“…Both IWF and ICP are compared to the optimal solution for a two-user case. In [11] and [12], algorithms very similar to one of our algorithms that we have in our preliminary work [23] were developed in parallel. The objective is to minimize the total power consumption while satisfying the data rate requirement of each link.…”

Section: Related Workmentioning

confidence: 99%

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Subcarrier allocation and bit loading algorithms for OFDMA-based wireless networks

Kulkarni¹,

Adlakha

Srivastava

2005

IEEE Trans. on Mobile Comput.

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114

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Abstract-Orthogonal Frequency Division Multiple Access (OFDMA) is an emerging multiple access technology. In this paper, we consider OFDMA in the context of fixed wireless networks. This paper addresses the problem of assigning subcarriers and bits to point-to-point wireless links in the presence of cochannel interference and Rayleigh fading. The objective is to minimize the total transmitted power over the entire network while satisfying the data rate requirement of each link. We formulate this problem as a constrained optimization problem and present centralized algorithms. The simulation results show that our approach results in an efficient assignment of subcarriers and transmitter power levels in terms of the energy required for transmitting each bit of information. However, centralized algorithms require knowledge of the entire network topology and channel characteristics of every link. In a practical scenario, that would not be the situation and there is a need for distributed rate allocation algorithms. To address this need, we also present a distributed algorithm for allocating subcarriers and bits in order to satisfy the rate requirements of the links.

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Section: Related Workmentioning

confidence: 99%

“…The centralized algorithms were first presented in our conference paper [23]. Based on our centralized algorithms, we obtain a distributed algorithm and discuss the trade offs involved.…”

Section: Paper Contributions and Overviewmentioning

confidence: 99%

Subcarrier allocation and bit loading algorithms for OFDMA-based wireless networks

Kulkarni¹,

Adlakha

Srivastava

2005

IEEE Trans. on Mobile Comput.

Self Cite

114

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“…This algorithm step is similar to the one proposed in [9], [10] with the exception that it does not run over all subcarriers (and in case of a cellular system also over all base stations) since these allocations have been done already in previous steps. In effect, the computational load is reduced.…”

Section: Step 3: Bit and Power Allocation Per Subcarriermentioning

confidence: 99%

“…This is because a cellular system spanning usually over a service area of several (often more) cells has its dynamics caused by changes of the traffic and channel conditions due to new users arrival, users departure and users mobility in various places within a service area. These dynamics of a cellular wireless system are clearly more visible than that of fixed xDSL-like systems described in [9], [10]. Therefore, we take the following directions in designing the allocation algorithm:…”

Section: Proposed Solutionmentioning

confidence: 99%

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Performance Evaluation of Bit Loading, Subcarrier Allocation, and Power Control Algorithms for Cellular OFDMA Systems

Pietrzyk

Janssen

2004

Personal Wireless Communications

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Abstract.We consider the problem of radio resource allocation for QoS support in the downlink of a cellular OFDMA system. The major impairments present are co-channel interference (CCI) and frequency selective fading. The allocation problem involves assignment of base stations, subcarriers and bits, as well as power control, for multiple users. We evaluate the performance of a three-stage, low-complexity, heuristic algorithm, which allows to distribute radio resources among multiple users according to theirs individual QoS requirements, while at the same time maintaining the QoS of already established links in all co-channel cells. The evaluation includes checking system operation for various conditions described by different: a) delay spread, b) data rate required by a single user and c) path loss. It is shown that the proposed method is superior in terms of offered traffic and blocking probability to classical method based on FDMA with power control. Also, the performance of our scheme increases in highly frequency selective environment, disastrous for classical fixed schemes, since our method benefits from multiuser diversity.

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Adaptive algorithms for OFDMA wireless ad hoc networks with multiple antennas

Venkataraman

Shynk

Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004.

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Subcarrier and bit allocation strategies for OFDMA based wireless ad hoc networks

Cited by 24 publications

References 9 publications

Subcarrier allocation and bit loading algorithms for OFDMA-based wireless networks

Subcarrier allocation and bit loading algorithms for OFDMA-based wireless networks

Performance Evaluation of Bit Loading, Subcarrier Allocation, and Power Control Algorithms for Cellular OFDMA Systems

Adaptive algorithms for OFDMA wireless ad hoc networks with multiple antennas

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