Joint grouping and scheduling in complexity-constrained broadcasting ad-hoc networks

Tam, Wai P.; Lok, Tat-Ming

doi:10.1109/icufn.2010.5547233

Cited by 1 publication

(1 citation statement)

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“…Therefore, it is essential to find the NC-CC scenario with an optimal number of sessions in each group. • The grouping concept has also been used in degraded broadcast channels [37] to reduce the complexity due to successive interference cancelation. The complexity is also an issue in the considered NC-CC system where PNC is essentially a form of linear interference cancelation with the use of a priori information, i.e., a priori information that each destination directly obtains from other sources.…”

Section: Group Allocationmentioning

confidence: 99%

Power Allocation and Group Assignment for Reducing Network Coding Noise in Multi-Unicast Wireless Systems

Mobini

Sadeghi

Khabbazian

et al. 2012

IEEE Trans. Veh. Technol.

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In this paper, we consider physical-layer network coding (PNC) in a multi-unicast wireless cooperative network with a single relay. We aim to deal with the NC noise, i.e., an additional noise term due to applying NC, with the objective of improving the network data rate. Our approaches are based on relay power-allocation and group-allocation techniques. To this end, we provide a mathematical framework for the achievable information rate of the system with the notion of power assignment at the relay. Based on this framework, we present a novel power-allocation scheme to maximize the total information rate among all the source-destination communication sessions in the network. Further, we provide a closed-form solution for the two-unicast case. Simulation results show that the proposed relay power allocation can significantly help alleviate the adverse effects of NC noise. Next, we propose a group-allocation scheme to assign sessions to different groups for performing PNC at the relay. We combine power allocation and group allocation to further improve performance. The formulated joint optimization problem is NP-hard. Therefore, a suboptimal heuristic algorithm is proposed and implemented at the relay to solve this problem. From the simulation results, the proposed joint group assignment and power-allocation scheme achieves up to 64% overall data rate gain for the multi-unicast system compared with a single-group system with no relay power assignment. This observation shows that PNC can be efficiently harnessed in a multi-unicast cooperative network by exploiting proposed approaches.Index Terms-Cooperative communications, group assignment, multi-unicast wireless systems, network coding (NC), NC noise, power allocation.

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Section: Group Allocationmentioning

confidence: 99%