JOINT OPTIMIZATION OF TRANSMIT AND RELAY BEAMFORMER FOR SINGLE GROUP MULTICAST TRANSMISSION

Date

2015-09-04

Author

Demir, Özlem Tuğfe
Tuncer, Temel Engin

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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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 transmitted power while satisfying signal-to-noise ratio constraint for each user, Nonconvex joint problem is firstly relaxed and then converted to an equivalent biconvex problem by using exact penalty approach. The equivalent problem is solved iteratively using alternating minimization. To the best of our knowledge, this is the first work that considers joint beamforming at the base station and the relays for single group multicasting scenario.

Subject Keywords

Multicast beamforming, Distributed beam-forming, Convex optimization, Exact penalty function

URI

https://hdl.handle.net/11511/52896

Conference Name

23rd European Signal Processing Conference (EUSIPCO)

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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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 ...
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...
MULTI-GROUP MULTICAST BEAMFORMING FOR SIMULTANEOUS WIRELESS INFORMATION AND POWER TRANSFER Demir, Özlem Tuğfe; Tuncer, Temel Engin (2015-09-04) In this paper, simultaneous wireless information and power transfer (SWIPT) concept is introduced for multi group multicast beamforming. Each user has a single antenna and a power splitter which divides the radio frequency (RF) signal into two for both information decoding and energy harvesting. The aim is to minimize the total transmission power at the base station while satisfying both signal-to-interference-plus- noise-ratio (SINR) and harvested power constraints at each user. Unlike unicast and certain ...
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 ...

Citation Formats

Ö. T. Demir and T. E. Tuncer, “JOINT OPTIMIZATION OF TRANSMIT AND RELAY BEAMFORMER FOR SINGLE GROUP MULTICAST TRANSMISSION,” presented at the 23rd European Signal Processing Conference (EUSIPCO), Nice, France, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52896.