scholarly journals Joint power and subchannel allocation in relay aided multi-cell OFDMA networks

2011 ◽  
Author(s):  
Miaomiao Dong ◽  
Qinghai Yang ◽  
Fenglin Fu ◽  
Kyung Sup Kwak
Keyword(s):  
Joint Power ◽  
Ofdma Networks ◽  
Subchannel Allocation

scholarly journals Joint Power and Subchannel Allocation for Distributed Storage in Cellular-D2D Underlays

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8059
Author(s):  
Fengxia Han ◽  
Hao Deng ◽  
Jianfeng Shi ◽  
Hao Jiang
Keyword(s):  
Original Problem ◽  
Distributed Storage ◽  
Storage System ◽  
Low Complexity ◽  
Total Power ◽  
Joint Power ◽  
Storage Devices ◽  
Total Transmission ◽  
Total Power Consumption ◽  
Subchannel Allocation

Wireless distributed storage is beneficial in the provision of reliable content storage and offloading of cellular traffic. In this paper, we consider a cellular device-to-device (D2D) underlay-based wireless distributed storage system, in which the minimum storage regenerating (MSR) coding combined with the partial downloading scheme is employed. To alleviate burdens on insufficient cellular resources and improve spectral efficiency in densely deployed networks, multiple storage devices can simultaneously use the same uplink cellular subchannel under the non-orthogonal multiple access (NOMA) protocol. Our objective is to minimize the total transmission power for content reconstruction, while guaranteeing the signal-to-interference-plus-noise ratio (SINR) constraints for cellular users by jointly optimizing power and subchannel allocation. To tackle the non-convex combinational program, we decouple the original problem into two subproblems and propose two low-complexity algorithms to efficiently solve them, followed by a joint optimization, implemented by alternately updating the solutions to each subproblem. The numerical results illustrate that our proposed algorithms are capable of performing an exhaustive search with lower computation complexity, and the NOMA-enhanced scheme provides more transmission opportunities for neighbor storage devices, thus significantly reducing the total power consumption.

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