The emerging demand for multi-hop relay networks requires significant improvement of the end-to-end throughput through the development of a more advanced transmission technology. Research on multiple-input multiple-output (MIMO) has been actively pursued for achieving channel throughput improvements for cellular networks. In a multi-hop ad-hoc network, it is difficult for each sensor node to have multiple transmit antennas, therefore, virtual MIMO has been introduced as an extended version of cellular MIMO. The conventional virtual MIMO scheme requires additional complexity in order to implement the same functionality used for cellular systems. Therefore, we propose a new framework for the broadcast virtual MIMO system (BVMS) by developing an innovative max-min/min-max (M 2-m 2) beamforming technology optimized for the multi-hop relay network. Compared to the conventional singular value decomposition (SVD)-based or random beamforming technologies, M 2-m 2 beamforming significantly improves the end-to-end channel throughput up to the optimal bound for the BVMS over a multi-hop relay network.
Bibliographical noteFunding Information:
Manuscript received 1 August 2011; revised 1 May 2012. This research was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0011995). This research was supported by the Ministry of Knowledge Economy, Korea, under the Convergence Information Technology Research Center support program (NIPA-2012-H0401-12-1003) supervised by the National IT Industry Promotion Agency.
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering