An efficient compensation scheme combining a timedomain Gaussian elimination（GE） channel estimator and a frequency-domain GE equalizer is proposed for orthogonal frequency division multiplexing（OFDM） systems with ...An efficient compensation scheme combining a timedomain Gaussian elimination（GE） channel estimator and a frequency-domain GE equalizer is proposed for orthogonal frequency division multiplexing（OFDM） systems with frequencydependent in-phase and quadrature-phase（IQ） imbalances at both transmitter and receiver.Compared with the traditional least square and least mean square compensation schemes,the proposed compensation scheme achieves the same bit error rate as the ideal IQ branches by using only two training OFDM symbols instead of about 20 OFDM symbols.展开更多
针对基于接收信号强度(received signal strength,RSS)测距定位框架,提出基于贝叶斯测距和迭代最小二乘定位的RSS的定位算法.在测距阶段,先利用贝叶斯概率模型处理测距过程,并采用最小均方误差(minimum mean square error,MMSE)估计距离...针对基于接收信号强度(received signal strength,RSS)测距定位框架,提出基于贝叶斯测距和迭代最小二乘定位的RSS的定位算法.在测距阶段,先利用贝叶斯概率模型处理测距过程,并采用最小均方误差(minimum mean square error,MMSE)估计距离;在定位阶段,利用迭代最小二乘(iterative least square,ILS)估计节点的位置,最后重点对其定位性能做了理论分析和对比实验.仿真结果表明,提出的MMSE+ILS定位的方案极大地提高了定位精度,并降低了计算复杂度,但运行时间略有提高.展开更多
基金supported by the National Natural Science Fundation of China(6127123061172073)the Open Research Fund of National Mobile Communications Research Lab(2010D13)
文摘An efficient compensation scheme combining a timedomain Gaussian elimination（GE） channel estimator and a frequency-domain GE equalizer is proposed for orthogonal frequency division multiplexing（OFDM） systems with frequencydependent in-phase and quadrature-phase（IQ） imbalances at both transmitter and receiver.Compared with the traditional least square and least mean square compensation schemes,the proposed compensation scheme achieves the same bit error rate as the ideal IQ branches by using only two training OFDM symbols instead of about 20 OFDM symbols.
文摘针对基于接收信号强度(received signal strength,RSS)测距定位框架,提出基于贝叶斯测距和迭代最小二乘定位的RSS的定位算法.在测距阶段,先利用贝叶斯概率模型处理测距过程,并采用最小均方误差(minimum mean square error,MMSE)估计距离;在定位阶段,利用迭代最小二乘(iterative least square,ILS)估计节点的位置,最后重点对其定位性能做了理论分析和对比实验.仿真结果表明,提出的MMSE+ILS定位的方案极大地提高了定位精度,并降低了计算复杂度,但运行时间略有提高.
