2D MIMO Network Coding with Inter-Route Interference Cancellation.
ABSTRACT Infrastructure wireless mesh network has been attracting much attention due to the wide range of its application such as public wireless access, sensor network, etc. In recent years, researchers have shown that significant network throughput gain can be achieved by employing network coding in a wireless environment. For further improvement of network throughput in one dimensional (1D) topology, Ono et al. proposed to use multiple antenna technique combined with network coding. In this paper, being inspired by MIMO network coding in 1D topology, the authors establish a novel MIMO network coding algorithm for a 2D topology consisting of two crossing routes. In this algorithm, multiple network coded flows are spatially multiplexed. Owing to the efficient usage of radio resource of network coding and co-channel interference cancellation ability of MIMO, the proposed algorithm shows an 8-fold gain in network capacity compared to conventional methods in the best-case scenario.
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ABSTRACT: Backbone wireless mesh networks have attracted much of attention due to their wide-range applications. The use of CSMA/CA basedMAC protocols in mesh networks, however, leads to an inefficient resource utilization, and to high latency. Several alternative protocols including directional MAC, multichannel MAC only provide marginal improvement. Recently, a cross-layer design employing multiple antenna techniques and network coding called MIMO network coding was proposed. Owing to multiple access interference cancellation ability of MIMO, bi-directional flow multiplexing capability of network coding in combination with an efficient channel access scheme of TDMA/TDD, MIMO two-way relay provides significantly high end-to-end capacity. In this paper, MIMO network coding is considered as an alternative PHY/MAC protocol of CSMA/CA. This paper provides details of the protocol and develops network simulators for performance evaluation. Furthermore, an efficient retransmission scheme for transmission system employing network coding is proposed. The paper shows that MIMO network coding achieves significant network performance improvement with respect to CSMA/CA mesh networks. The proposed retransmission scheme is also shown to be effective in terms of resource usage as well as QoS guarantee.EURASIP Journal on Wireless Communications and Networking. 01/2010;
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ABSTRACT: In recent years, network coding has been introduced at physical layer to increase network capacity of wireless mesh networks (WMN). In this paper, to support reliable packet relaying in WMN employing network coding, we propose an efficient retransmission scheme. The proposed scheme is efficient since it exploits the property of network coded packet header instead of using conventional schemes based on transmission of acknowledgement (ACK/NAK) packets as shown by analytic results. Benefit of the proposed scheme is furthermore verified in a one dimensional (1D) MIMO two-way relay network employing network coding. Numerical result shows that our proposed scheme can significantly improve end-to-end packet delivery ratio in the presence of lossy wireless links.Proceedings of the 71st IEEE Vehicular Technology Conference, VTC Spring 2010, 16-19 May 2010, Taipei, Taiwan; 01/2010
- IEICE Transactions. 01/2011; 94-B:698-717.