公开(公告)号：US20080159123A1

公开(公告)日：2008-07-03

申请号：US12043694

申请日：2008-03-06

申请人： Ardavan M. Tehrani ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi Hsiu Wang

发明人： Ardavan M. Tehrani ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Yi Hsiu Wang

IPC分类号： H04L5/04

CPC分类号： H04L27/2657 ,  H04B7/0845 ,  H04B7/0848 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2675

摘要： The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

摘要翻译： 本发明提供了一种多天线接收机组合的高数据率宽带分组化无线通信信号的装置和方法，其中该装置包括M个接收天线，接收M个高数据速率宽带分组化无线通信信号，其中每个信号包括N个频率 箱子。 在一个示例性实施例中，该装置包括（1）联合定时恢复单元，其对每个信号执行联合粗略信号定时估计，联合频率偏移估计和联合精细定时估计，（2）M个快速傅里叶变换单元 FFT），其将每个M个信号的数字数据转换为N个接收频率中的每一个的频域信息，并且为每个信号输出Q个导频，其中Q是正整数，以及（3）组合器， 对N个接收频率中的每一个进行加权并组合M FFT的输出。

公开(公告)号：US07039004B2

公开(公告)日：2006-05-02

申请号：US10263415

申请日：2002-10-01

申请人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

发明人： Qinfang Sun ,  Won-Joon Choi ,  Jeffrey M. Gilbert ,  Ning Zhang ,  Yi-Hsiu Wang ,  Tao-Fei Samuel Ng

IPC分类号： H04J11/00

CPC分类号： H04L25/022 ,  H04L25/0236 ,  H04L27/2647 ,  H04L2025/03522

摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.

摘要翻译： 当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。 例如，使用数据分组的前导码中的两个训练符号来提供信道估计。 五十四个子通道中的四个保留用于提供相位估计。 然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。 有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。 决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。