...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Communications >Joint Channel Estimation, Partial Successive Interference Cancellation, and Data Decoding for DS-CDMA Based on the SAGE Algorithm
【24h】

Joint Channel Estimation, Partial Successive Interference Cancellation, and Data Decoding for DS-CDMA Based on the SAGE Algorithm

机译：基于SAGE算法的DS-CDMA联合信道估计，部分连续干扰消除和数据解码

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

This paper deals with the derivation and optimization of an iterative receiver architecture performing joint multiuser decoding and channel estimation. We consider an asynchronous multirate convolutional coded DS-CDMA system that communicates over quasi-static flat Rayleigh fading channels. The proposed receiver is derived within the space-alternating generalized expectation-maximization (SAGE) framework in connection with the noise-splitting approach. The used theoretical framework guarantees convergence of the receiver, as opposed to many other iterative receiver structures. Furthermore, the noise-splitting approach provides a set of noise-weighting coefficients that can be optimized under weak constraints. The inputs to the single-user decoders are linear combinations of two kinds of soft values with weights determined by the noise-weighting coefficients. These two kinds of soft values can be interpreted as a priori information and extrinsic information, respectively, if the channels are known. In the case of unknown channels, they are asymptotically a priori and asymptotically extrinsic, i.e., they become a priori and extrinsic when the length of the observed frame tends to infinity. In most cases, the optimum coefficients lead to extrinsic or asymptotically extrinsic values fed to the input of the single-user decoders. Monte Carlo simulations show that the proposed receiver is resistant to channel estimation errors and supports high system loads.
机译：本文涉及执行联合多用户解码和信道估计的迭代接收机体系结构的推导和优化。我们考虑一种通过准静态平坦瑞利衰落信道进行通信的异步多速率卷积编码DS-CDMA系统。所提出的接收机是在与噪声分离方法有关的空间交替广义期望最大化（SAGE）框架内得出的。与许多其他迭代接收器结构相反，所使用的理论框架可确保接收器的收敛。此外，噪声分离方法提供了一组噪声加权系数，可以在弱约束下对其进行优化。单用户解码器的输入是两种软值的线性组合，其权重由噪声加权系数确定。如果通道是已知的，则这两种软值可以分别解释为先验信息和外部信息。在未知信道的情况下，它们渐近地是先验的，并且是渐近地外在的，即，当观察到的帧的长度趋于无穷大时，它们成为先验的和外在的。在大多数情况下，最佳系数会导致非本征或渐近非本征值馈入单用户解码器的输入。蒙特卡洛仿真表明，所提出的接收机具有抗信道估计误差的能力，并支持高系统负载。

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