首页> 外文期刊>IEEE communications letters >A SAGE Approach to Frequency Recovery in OFDM Direct-Conversion Receivers
【24h】

A SAGE Approach to Frequency Recovery in OFDM Direct-Conversion Receivers

机译:OFDM直接转换接收机中频率恢复的SAGE方法

获取原文
获取原文并翻译 | 示例
           

摘要

In-phase/quadrature (I/Q) imbalances are front-end impairments which may greatly complicate the synchronization task in a low-cost direct-conversion receiver (DCR). In this paper we investigate the possibility of using the space-alternating generalized expectation-maximization (SAGE) algorithm to recover the carrier frequency offset in OFDM terminals with a DCR architecture. Our study leads to a novel scheme that operates in a recursive fashion and exploits a conventional OFDM training preamble composed by several repeated parts. At each iteration, interference arising from I/Q impairments is subtracted from the received samples before updating the frequency estimate. The performance of the new scheme is assessed in terms of estimation accuracy and processing load by considering a wireless local area network (WLAN) compliant with the IEEE 802.11a standard. The main goal is to check whether the SAGE approach exhibits some advantages compared to existing alternatives.
机译:同相/正交(I / Q)不平衡是前端损害,可能会使低成本直接转换接收器(DCR)中的同步任务大大复杂化。在本文中,我们研究了使用空间替代广义期望最大化(SAGE)算法来恢复具有DCR架构的OFDM终端中的载波频率偏移的可能性。我们的研究导致了一种新颖的方案,该方案以递归方式运行,并利用了由几个重复部分组成的常规OFDM训练前同步码。在每次迭代中,在更新频率估计之前,从接收的样本中减去由I / Q损伤引起的干扰。通过考虑符合IEEE 802.11a标准的无线局域网(WLAN),可以根据估计准确性和处理负载来评估新方案的性能。主要目标是检查与现有替代方法相比,SAGE方法是否具有某些优势。

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