Title :
Interference Suppression Using Generalized Inverse Precoder for Downlink Heterogeneous Networks
Author :
Yifei Huang ; Durrani, Salman ; Xiangyun Zhou
Author_Institution :
Res. Sch. of Eng., Australian Nat. Univ., Canberra, ACT, Australia
Abstract :
This letter proposes an optimal precoder design using a generalized inverse structure for downlink crosstier interference suppression between macro base station (MBS) and femtocell access point (FAP) transmission in heterogeneous networks. Using Tikhonov regularization, we derive a closed form relationship between given MBS transmit power or interference constraints and the regularization parameter. Determining a Pareto optimal regularization parameter requires extensive computation. As an alternative, we propose an algorithm to find a suitable regularization parameter to achieve fairness in the system, i.e., equal FAP and MBS user rates. Simulation results show that the proposed precoder greatly improves FAP user rates at the expense of a small yet tolerable decrease in average MBS user rate.
Keywords :
Pareto optimisation; femtocellular radio; interference suppression; precoding; radiofrequency interference; FAP transmission; MBS transmit power; Pareto optimal regularization parameter; Tikhonov regularization; average MBS user rate; downlink crosstier interference suppression; downlink heterogeneous networks; extensive computation; femtocell access point; generalized inverse precoder; interference constraints; interference suppression; macro base station; optimal precoder design; Approximation algorithms; Downlink; Interference suppression; Linear approximation; Vectors; Wireless communication; Heterogeneous networks; Tikhonov regularization; interference management; precoder;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/LWC.2015.2415488