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首页> 外文期刊>Canadian Journal of Pure and Applied Sciences >A REVIEW ON COOPERATIVE DIVERSITY TECHNIQUES BYPASSING CHANNEL ESTIMATION
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A REVIEW ON COOPERATIVE DIVERSITY TECHNIQUES BYPASSING CHANNEL ESTIMATION

机译：通过通道估计的合作多样性技术综述

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Wireless co mmunication technology has seen a remarkably fast evolution due to its capability to provide a quality, reliable and high-speed data transmission amongst the users. However, transmission of information in wireless channels is primarily impaired b y deleterious multipath fading, which affects the quality and reliability of the system. In order to overcome the detrimental effects of fading, Multiple-Input Multiple-Output (MIMO) technology is an attractive scheme that employs multiple transceiver antennas to carry the data over the same frequency band over a variety of signal paths. This technology has shown great solutions due to its ability to provide better spectral efficiency, capacity, throughput and robustness of the data transmission. But in practice, it is impractical to install multiple antennas on small -sized devices. Hence, to overcome the limitations of MIMO gain in the future wireless networks, cooperative diversity has recently draw in attention due to its ability to circumvent the difficulties of implementing actual antenna arrays in Multiple-Input and Multiple-Output (MIMO). By exploiting the broadcast feature of the wireless medium, coo peration among multiple nearby nodes is formed for data transmission. At the receiver, the signals are either coherently or differentially detected. Coherent detection requires exact channel estimation, which is difficult to apply in a time-varying channel. Hence, when the nodes are mobile, or when the channel is inaccurately estimated, the differential detection techniques that omit channel estimation become an alternative as compared to coherent detection. This article presents a review of the differential transmission techniques for cooperative diversity networks. The article begins with the development of the differential detection techniques. Then, the concept of double-d ifferential techniq ue with the presence of carrier offset is addressed. The review of these studies is presented so as to provide directions for future developments.
机译：无线通信技术由于能够在用户之间提供高质量，可靠和高速的数据传输而发展迅速。然而，通过有害的多径衰落，无线信道中的信息传输主要受到损害，这会影响系统的质量和可靠性。为了克服衰落的有害影响，多输入多输出（MIMO）技术是一种引人注目的方案，该方案采用多个收发器天线在各种信号路径上的同一频带上承载数据。由于该技术能够提供更好的频谱效率，容量，吞吐量和数据传输的鲁棒性，因此它已显示出出色的解决方案。但是实际上，在小型设备上安装多个天线是不切实际的。因此，为了克服未来无线网络中MIMO增益的局限性，协作分集由于其能够克服在多输入多输出（MIMO）中实现实际天线阵列的困难而受到关注。通过利用无线介质的广播特性，形成多个附近节点之间的协作以进行数据传输。在接收机处，信号被相干或差分检测。相干检测需要精确的信道估计，这很难应用于时变信道中。因此，当节点是移动的或信道估计不正确时，与相干检测相比，省略信道估计的差分检测技术将成为替代方案。本文介绍了用于协作分集网络的差分传输技术。本文从差分检测技术的发展开始。然后，讨论了存在载波偏移的双微分技术的概念。提出了对这些研究的综述，以便为将来的发展提供指导。

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