• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Information Theory, IEEE Transactions on >Buffer-Aided Relaying With Adaptive Link Selection—Fixed and Mixed Rate Transmission
【24h】

Buffer-Aided Relaying With Adaptive Link Selection—Fixed and Mixed Rate Transmission

机译：具有自适应链路选择功能的缓冲辅助中继—固定速率和混合速率传输

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We consider a simple network consisting of a source, a half-duplex decode-and-forward relay with a buffer, and a destination. We assume that the direct source–destination link is not available and all links undergo fading. We propose two new buffer-aided relaying schemes with different requirements regarding the availability of channel state information at the transmitter (CSIT). In the first scheme, neither the source nor the relay has full CSIT, and consequently, both nodes are forced to transmit with fixed rates. In contrast, in the second scheme, the source does not have full CSIT and transmits with fixed rate but the relay has full CSIT and adapts its transmission rate accordingly. In the absence of delay constraints, for both fixed rate and mixed rate transmission, we derive the throughput-optimal buffer-aided relaying protocols which select either the source or the relay for transmission based on the instantaneous signal-to-noise ratios (SNRs) of the source–relay and relay–destination links. In addition, for the delay constrained case, we develop buffer-aided relaying protocols that achieve a predefined average delay. Compared to conventional relaying protocols, which select the transmitting node according to a predefined schedule independent of the instantaneous link SNRs, the proposed buffer-aided protocols with adaptive link selection achieve large performance gains. In particular, for fixed rate transmission, we show that the proposed protocol achieves a diversity gain of two as long as an average delay of more than three time slots can be afforded. Furthermore, for mixed rate transmission with an average delay of $E{T}$ time slots, a multiplexing gain of $r=1-1/ break (2E{T})$ is achieved. As a by-product of the considered link-adaptive protocols, we also develop a novel conventional- relaying protocol for mixed rate transmission, which yields the same multiplexing gain as the protocol with adaptive link selection. Hence, for mixed rate transmission, for sufficiently large average delays, buffer-aided half-duplex relaying with and without adaptive link selection does not suffer from a multiplexing gain loss compared to full-duplex relaying.
机译：<？Pub Dtl？>我们考虑一个简单的网络，它由一个源，一个带缓冲区的半双工解码转发中继和一个目标组成。我们假定直接的源－目标链接不可用，并且所有链接都将发生衰落。我们提出了两种新的缓冲区辅助中继方案，它们对发射机（CSIT）的信道状态信息的可用性有不同的要求。在第一种方案中，源和中继都不具有完整的CSIT，因此，两个节点都被迫以固定速率进行传输。相反，在第二种方案中，源不具有完整的CSIT并以固定的速率发送，而中继站具有完整的CSIT并相应地调整其传输速率。在没有延迟约束的情况下，对于固定速率和混合速率传输，我们导出吞吐量最佳的缓冲区辅助中继协议，该协议根据瞬时信噪比（SNR）选择源或中继进行传输源－中继和中继－目标链接。此外，对于延迟受限的情况，我们开发了可实现预定义平均延迟的缓冲区辅助中继协议。与常规中继协议相比，传统中继协议根据独立于瞬时链路SNR的预定义时间表选择发送节点，所提出的具有自适应链路选择的缓冲区辅助协议可实现较大的性能提升。特别地，对于固定速率传输，我们表明，只要可以提供三个以上时隙的平均延迟，建议的协议就可以实现2的分集增益。此外，对于平均延迟为 $ E {T} $ 时隙的混合速率传输，的复用增益实现了expressiontype =“ inline”> $ r = 1-1 / break（2E {T}）$ 。作为考虑的链路自适应协议的副产品，我们还开发了一种新颖的常规中继协议以进行混合速率传输，该协议产生的复用增益与具有自适应链路选择的协议相同。因此，对于混合速率传输，对于足够大的平均延迟，与全双工中继相比，具有和不具有自适应链路选择的缓冲器辅助半双工中继不会遭受多路复用增益损失。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号