DISTRIBUTED BEAMFORMING IN RELAY NETWORKS FOR ENERGY HARVESTING MULTI-GROUP MULTICAST SYSTEMS

2016-03-25
Demir, Özlem Tuğfe
Tuncer, Temel Engin
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. The design problem is to determine the complex relay weights and the power splitting ratios for the users. The resulting optimization problem is nonconvex and converted into a form suitable for quadratically constrained quadratic programming. In addition to the conventional relay beamforming, distributed phase-only beamformer design is also considered and both beamformer design problems are solved iteratively using feasible point pursuit-successive convex approximation algorithm. Several simulations are performed and the advantages of both approaches are outlined.

Suggestions

Relay-Assisted Beamforming for Multicast Systems with Energy Harvesting Capability
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2016-05-19)
In this paper, multi-group multicasting scenario is considered where single antenna sources transmit their own information to different groups of users with the help of single antenna relays. Users have energy harvesting capability, i.e., a part of the received signal is used for information decoding while the rest is used for energy harvesting. Beamforming is performed by the relays which use amplify-and-forward protocol. The design of complex relay coefficients and power splitting ratios for the users is ...
OPTIMUM DISCRETE DISTRIBUTED BEAMFORMING FOR SINGLE GROUP MULTICASTING RELAY NETWORKS WITH RELAY SELECTION
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2015-04-24)
In this paper, broadcast beamforming with relay selection is considered in wireless relay networks where there is no direct link between the source and the receivers. A source node transmits common information to many users employing multiple relays which use amplify-and-forward relay protocol. The channel state information is assumed to be available at a single relay to compute the relay weights and distribute them. Discrete relay weights are used due to several advantages including decreased overhead for ...
Optimal resource allocation algorithms for efficient operation of wireless networks
Özel, Ömür; Uysal Bıyıkoğlu, Elif; Department of Electrical and Electronics Engineering (2009)
In this thesis, we analyze allocation of two separate resources in wireless networks: transmit power and buffer space. Controlled allocation of power can provide good performance for both users and the network. Although centralized mechanisms are possible, distributed power control algorithms are preferable for efficient operation of the network. Viewing distributed power allocation as the collection of rational decisions of each user, we make game theoretic problem formulations, devise distributed algorith...
Relay Selection for Efficient HARQ-IR Protocols in Relay-Assisted Multisource Multicast Networks
Quoc-Tuan Vien, Quoc-Tuan Vien; Nguyen, Huan X.; Shah, Purav; Ever, Enver; Duc To, Duc To (2014-05-21)
This paper investigates relay selection for reliable data transmission in relay-assisted multisource multicast networks (RMMNs) where multiple source nodes distribute information to a set of destination nodes with the assistance of multiple relay nodes. Hybrid automatic repeat request with incremental redundancy (HARQ-IR) is used and supported by either a physical-layer network coding (PNC) or an analog network coding (ANC) technique employed at the relays. By deriving efficiency metrics of the HARQ-IR prot...
Discrete Relay Beamforming for Broadcasting with Relay Selection
Demir, Özlem Tuğfe; Tuncer, Temel Engin (2015-05-19)
In this paper, broadcast beamforming problem is considered in relay-assisted wireless networks. Two-phase relay communication is adopted. In the first phase, a source transmits common information to multiple relays which use amplify-and-forward relay protocol. Each relay multiplies its received signal by a complex weight and transmits it to the receivers. The amplitudes and phases of complex relay weights are chosen from discrete sets in order to decrease overhead for the feedback channel. Relay selection i...
Citation Formats
Ö. T. Demir and T. E. Tuncer, “DISTRIBUTED BEAMFORMING IN RELAY NETWORKS FOR ENERGY HARVESTING MULTI-GROUP MULTICAST SYSTEMS,” 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54897.