Discrete Relay Beamforming for Broadcasting with Relay Selection

Date

2015-05-19

Author

Demir, Özlem Tuğfe
Tuncer, Temel Engin

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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 is employed in order to decrease network complexity. Nonlinear optimization problem is converted to a linear form suitable for mixed integer linear programming. The optimum solution can be found using branch-and-cut method.

Subject Keywords

Relay beamforming, Relay selection, Discrete beam-forming, Mixed integer linear programming

URI

https://hdl.handle.net/11511/52744

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Department of Electrical and Electronics Engineering, Conference / Seminar

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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 ...
Röle seçimi ile tüme gönderim için ayrık röle hüzme şekillendirme Tuncer, Temel Engin (null; 2015-05-16) 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-andforward 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 is...
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 ...
DISTRIBUTED BEAMFORMING IN RELAY NETWORKS FOR ENERGY HARVESTING MULTI-GROUP MULTICAST SYSTEMS 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...
Interference suppression capability of faster than symbol rate sampling and frequency domain oversampling Balevi, Eren; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2016) Detection of symbols in the presence of many interference sources is a difficult task in wireless channels. It is obligatory to reduce the interference for reliable communication. In this dissertation, minimum mean square error (MMSE) detection is investigated to suppress interference. Faster Than Symbol Rate (FTSR) sampling and Frequency Domain Oversampling (FDO) methods are proposed to enhance the interference suppression level of MMSE detection for both single user and multiuser communication. The aim of...

Citation Formats

Ö. T. Demir and T. E. Tuncer, “Discrete Relay Beamforming for Broadcasting with Relay Selection,” 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52744.