A flexible mid-term frequency domain scheduler for resource allocation in HetNets based on the SINR requested by users

2015 ◽  
Vol 79 ◽  
pp. 247-262 ◽  
Author(s):  
Álvaro Pachón ◽  
Andrés Navarro ◽  
Ubaldo García-Palomares
Keyword(s):  
Resource Allocation ◽  
Frequency Domain ◽  
Term Frequency

scholarly journals Joint Resource Allocation for Frequency-Domain Artificial Noise Assisted Multiuser Wiretap OFDM Channels with Finite-Alphabet Inputs

Symmetry ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 855
Author(s):  
Linhui Fan ◽  
Bo Tang ◽  
Qiuxi Jiang ◽  
Fangzheng Liu ◽  
Chengyou Yin
Keyword(s):  
Resource Allocation ◽  
Frequency Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
Finite Alphabet ◽  
Artificial Noise ◽  
Gaussian Channel ◽  
Subcarrier Allocation ◽  
Significant Challenge ◽  
Joint Resource Allocation ◽  
Discrete Channel

The security issue on the physical layer is of significant challenge yet of paramount importance for 5G communications. In some previous works, transmit power allocation has already been studied for orthogonal frequency division multiplexing (OFDM) secure communication with Gaussian channel inputs for both a single user and multiple users. Faced with peak transmission power constraints, we adopt discrete channel inputs (e.g., equiprobable Quadrature Phase Shift Keying (QPSK) with symmetry) in a practical communication system, instead of Gaussian channel inputs. Finite-alphabet inputs impose a more significant challenge as compared with conventional Gaussian random inputs for the multiuser wiretap OFDM systems. This paper considers the joint resource allocation in frequency-domain artificial noise (AN) assisted multiuser wiretap OFDM channels with discrete channel inputs. This security problem is formulated as nonconvex sum secrecy rate optimization by jointly optimizing the subcarrier allocation, information-bearing power, and AN-bearing power. To this end, with a suboptimal subcarrier allocation scheme, we propose an efficient iterative algorithm to allocate the power between the information and the AN via the Lagrange duality method. Finally, we carry out some numerical simulations to demonstrate the performance of the proposed algorithm.

Improved Frequency Domain Resource Allocation Indication

2020 ◽  
Author(s):  
Kittipong Kittichokechai ◽  
Mattias Andersson ◽  
Robert Baldemair ◽  
Yufei Blankenship
Keyword(s):  
Resource Allocation ◽  
Frequency Domain
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