首页> 外文会议>2011 IEEE 73rd Vehicular Technology Conference >An Adaptive Transmission Scheme Robust to Variant Moving Speeds
【24h】

An Adaptive Transmission Scheme Robust to Variant Moving Speeds

机译:鲁棒的可变传输速度自适应传输方案

获取原文

摘要

Coherent space-time codes perform not so excellent in high moving speed case due to the inaccurate channel estimation. However, differential space-time code is appealing in this case because no channel estimation is needed. While in low and middle signal-to-noise ratio regions differential space-time codes are inferior to the coherent ones. To achieve an excellent performance in a various moving speed environments, we develop an adaptive transmission scheme in this paper where coherent space-time code is applied in low and middle moving speed cases, while differential space-time code is used in high moving speed case. Because the proposed scheme adopts the space-time codes wisely according to the moving speed, it outperforms the scheme which purely utilizes coherent space-time code or differential space-time code and thus is suitable for various moving speed environments. Moreover, two differential space-time codes based on differential Alamouti code are proposed in this paper with the merits of low decoding complexity, suitable for general number of transmit antennas and no code rate loss. The effectiveness of the proposed scheme and the proposed differential space-time codes is supported by numerical simulations.
机译:由于信道估计不准确,因此在高移动速度情况下,相干空时码的性能不是很好。然而,在这种情况下,由于不需要信道估计,因此差分时空码是吸引人的。在中低信噪比区域,差分时空编码不如相干编码。为了在各种移动速度环境下实现出色的性能,我们开发了一种自适应传输方案,其中在低速和中速移动情况下应用相干时空代码,而在高移动速度情况下使用差分时空代码。由于所提出的方案根据移动速度明智地采用了时空码,因此其性能优于单纯使用相干时空码或差分时空码的方案,因此适用于各种移动速度环境。此外,本文提出了两种基于差分Alamouti码的差分时空码,具有解码复杂度低,适用于发射天线数量大,无码率损失的优点。数值仿真证明了所提出的方案和所提出的差分时空码的有效性。

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