Improved ADMM-Based Algorithm for Multi-Group Multicast Beamforming in Large-Scale Antenna Systems

Demir, Özlem Tuğfe
Tuncer, Temel Engin
In this paper, we consider beamformer design for multi-group multicasting where a common message is transmitted to the users in each group. We propose a novel effective alternating direction method of multipliers (ADMM) formulation in order to reduce the computational complexity of the existing state-of-the-art algorithm for multi-group multicast beamforming with per-antenna power constraints. The proposed approach is advantageous for the scenarios where the dimension of the channel matrix is less than the number of antennas at the base station. This case is always valid when the number of users is less than that of antennas, which is a practical situation in massive-MIMO systems. Simulation results show that the proposed method performs the same with significantly less computational time compared to the benchmark algorithm.
European Signal Processing Conference (EUSIPCO)


Optimization techniques for nonconvex problems and optimum discrete transmit beamformer design /
Demir, Özlem Tuğfe; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2014)
In this thesis, transmit beamformer design is investigated for single group multicast scenario. The problem is considered for both discrete and continuous case. The discrete problem is converted to a linear form in which there are both discrete and continuous variables. The resulting mixed integer linear programming problem is optimally solved with much lower computational complexity than brute force search. For practical reasons, robust version of the problem is also elaborated and solved with mixed intege...
Optimum discrete transmit beamformer design
DEMİR, ÖZLEM TUĞFE; Tuncer, Temel Engin (2015-01-01)
In this paper, transmit beamformer design problem is considered for single group multicast case. This problem is treated in discrete phase and amplitude and converted to a linear form. The solution of this linear optimization problem is always feasible as long as the total transmit power is above a certain value. The proposed method is guaranteed to find the optimum solution. This new approach is used to design discrete phase-only (DPOB) and discrete phase-amplitude beamformers (DPAB). It is shown that the ...
Optimum Discrete Max-Min Style Broadcast Beamforming Design
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2014-04-25)
In this paper, max-mm style transmit beamformer design for single group multicast (broadcast) scenario is considered. The phase and amplitude values of beamformer vector coefficients are selected from finite discrete sets. With the help of integer variables, original optimization problem is converted to a linear form appropriate for mixed integer linear programming. The solution is always feasible as long as the total power is above a certain value. Branch and cut strategy guarantees the optimum solution. P...
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2016-03-25)
In this paper, simultaneous wireless information and power transfer (SWIPT) is considered for multi-group multicasting relay networks where there is no direct link between the source and destination nodes. Each source transmits its own multicast stream to a group of users with the help of single antenna relays which use amplify-and-forward relay protocol. Each user has energy harvesting capability. A part of the received signal is used for information decoding while the rest is used for energy harvesting. T...
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2015-09-04)
In this paper, single group multicasting is considered for the cooperative relay network. Two-phase transmission is performed and amplify-and-forward relay protocol is used. In the first phase, the base station broadcasts the common signal to the single antenna relays by employing beamforming. Each relay multiplies its received signal by a complex weight and retransmits it to the single antenna users. The aim is to find the beamformer weights at the base station and the relays jointly to minimize the total ...
Citation Formats
Ö. T. Demir and T. E. Tuncer, “Improved ADMM-Based Algorithm for Multi-Group Multicast Beamforming in Large-Scale Antenna Systems,” presented at the European Signal Processing Conference (EUSIPCO), Rome, Italy, 2018, Accessed: 00, 2020. [Online]. Available: