Cooperative MIMO transmissions using threshold based MAC protocol in wireless sensor network

J. Vidhya, S. Shobana, S. Divyanka, K. Alamelu, P. Dananjayan
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Abstract

Sensor network requires robust and efficient communication protocols to maximise the network lifetime. Radio irregularity, channel fading and interference results in larger energy consumption and latency for packet transmission over wireless channel. Cooperative multi-input multi-output (MIMO) scheme can significantly improve the communication performance when incorporated in wireless sensor network (WSN). The medium access control (MAC) protocol designed for the network must be stable and should improve the performance gains of MIMO. Hence, this paper proposes a distributed threshold based MAC protocol for cooperative MIMO transmissions using space time block code (STBC). The protocol uses thresholding scheme that is updated dynamically based on queue length at the sending node to achieve lesser energy consumption and minimise latency ensuring stability of transmission queues at the nodes. STBC and code combining techniques are applied to utilise inherent spatial diversity in wireless cooperative MIMO systems. The performance of the proposed protocol is evaluated and compared with fixed group size cooperative MIMO MAC protocol with and without STBC coding. Results show that the proposed protocol outperforms point to point communication and MIMO MAC protocol that use fixed cooperative group size. For the proposed MAC protocol, STBC technique provides significant energy savings and minimises the packet delay by leveraging MIMO diversity gains.
基于阈值MAC协议的无线传感器网络协同MIMO传输
传感器网络需要鲁棒和高效的通信协议,以最大限度地延长网络寿命。无线信道中的无线电不规则性、信道衰落和干扰导致了无线信道中较大的能量消耗和时延。协作式多输入多输出(MIMO)方案在无线传感器网络(WSN)中应用后,可以显著提高通信性能。为网络设计的介质访问控制(MAC)协议必须稳定,并应提高MIMO的性能增益。因此,本文提出了一种基于分布式阈值的MAC协议,用于使用空时分组码(STBC)的协同MIMO传输。该协议采用基于发送节点队列长度动态更新的阈值方案,以实现更小的能量消耗和最小化延迟,确保节点传输队列的稳定性。在无线协同MIMO系统中,采用STBC和码合并技术来利用固有的空间分集。对该协议的性能进行了评估,并与带STBC编码和不带STBC编码的固定组大小合作MIMO MAC协议进行了比较。结果表明,该协议优于使用固定合作组大小的点对点通信和MIMO MAC协议。对于所提出的MAC协议,STBC技术通过利用MIMO分集增益,提供了显著的节能和最小化数据包延迟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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