公开(公告)号：US08687722B2

公开(公告)日：2014-04-01

申请号：US13516130

申请日：2011-09-01

申请人： Hajime Suzuki ,  Joseph Abraham Pathikulangara ,  David Humphrey

发明人： Hajime Suzuki ,  Joseph Abraham Pathikulangara ,  David Humphrey

IPC分类号： H04K1/10

CPC分类号： H04L25/022 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0228

摘要： An OFDM wireless communication system with an access point and a plurality of remote user terminals estimates an uplink channel. The access point receives training symbols transmitted by the user terminals. Each training symbol includes pilot symbols associated with phase offset estimation OFDM sub-carriers. The phase offset estimation sub-carriers include subsets of sub-carriers associated with each respective user terminals. Each subset is used exclusively by the associated user terminal during channel estimation. The channel estimation sub-carriers are used by all user terminals. For each terminal the access point estimates symbol-specific phase offsets specific to the user terminal using the received pilot symbols associated with the user specific subset of the phase offset estimation sub-carriers. The access point also estimates the uplink channel using the user-terminal-symbol-specific phase offset estimates and the received symbols.

摘要翻译： 具有接入点和多个远程用户终端的OFDM无线通信系统估计上行链路信道。 接入点接收用户终端发送的训练符号。 每个训练符号包括与相位偏移估计OFDM子载波相关联的导频符号。 相位偏移估计子载波包括与每个相应用户终端相关联的子载波子集。 每个子集在信道估计期间由相关联的用户终端专门使用。 信道估计子载波由所有用户终端使用。 对于每个终端，接入点使用与相位偏移估计子载波的用户特定子集相关联的接收到的导频符号来估计特定于用户终端的特定于符号的相位偏移。 接入点还使用用户终端符号特定的相位偏移估计和接收到的符号来估计上行链路信道。

公开(公告)号：US20120314751A1

公开(公告)日：2012-12-13

申请号：US13516130

申请日：2011-09-01

申请人： Hajime Suzuki ,  Joseph Abraham Pathikulangara ,  David Humphrey

发明人： Hajime Suzuki ,  Joseph Abraham Pathikulangara ,  David Humphrey

IPC分类号： H04L27/28 ,  H04W88/08

CPC分类号： H04L25/022 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0228

摘要： Disclosed is an OFDM wireless communication system comprising an access point, and a plurality of remote user terminals. The access point receives one or more training symbols transmitted by the user terminals, each training symbol comprising pilot symbols associated with phase offset estimation OFDM sub-carriers of said training symbol, the phase offset estimation sub-carriers comprising subsets of sub-carriers associated with respective user terminals, wherein each subset is used exclusively by the associated user terminal during channel estimation, and further symbols associated with channel estimation OFDM sub-carriers of said training symbol, wherein the channel estimation sub-carriers are used by all user terminals. The access point estimates, for each user terminal, symbol-specific phase offsets specific to the user terminal using the received pilot symbols associated with the user specific subset of the phase offset estimation sub-carriers; and estimates the uplink channel using the user-terminal-symbol-specific phase offset estimates and the received further symbols.

摘要翻译： 公开了一种包括接入点和多个远程用户终端的OFDM无线通信系统。 接入点接收由用户终端发送的一个或多个训练符号，每个训练符号包括与所述训练符号的相位偏移估计OFDM子载波相关联的导频符号，所述相位偏移估计子载波包括与 相应的用户终端，其中每个子集在信道估计期间由相关联的用户终端专门使用，以及与所述训练符号的信道估计OFDM子载波相关联的其他符号，其中，所有用户终端使用信道估计子载波。 接入点针对每个用户终端，使用与相位偏移估计子载波的用户特定子集相关联的接收到的导频符号来估计特定于用户终端的符号特定相位偏移; 并且使用用户终端符号特定的相位偏移估计和所接收的另外的符号来估计上行链路信道。

公开(公告)号：US08675512B2

公开(公告)日：2014-03-18

申请号：US12746911

申请日：2009-08-10

申请人： Hajime Suzuki ,  Douglas Brian Hayman ,  Joseph Abraham Pathikulangara ,  Iain Bruce Collings ,  Zhuo Chen

发明人： Hajime Suzuki ,  Douglas Brian Hayman ,  Joseph Abraham Pathikulangara ,  Iain Bruce Collings ,  Zhuo Chen

IPC分类号： H04J1/16 ,  H04J3/06

CPC分类号： H04W56/0045 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/08 ,  H04L5/0005 ,  H04W56/006

摘要： A user terminal for wireless communication with a remote access point can include a mapping module, a delay module, a transmit module, and a directional antenna. The mapping module can be used to map one or more input data bits to an uplink symbol. The delay module can be used to apply a delay to the uplink symbol. The transmit module can be used to modulate the delayed symbol into a frequency channel. The directional antenna can be oriented along a dominant path to the access point, and the antenna is used to transmit the modulated symbol to the access point. The delay is chosen such that the transmitted symbol arrives at the access point simultaneously with a another symbol that is modulated into the frequency channel and transmitted by another user terminal.

摘要翻译： 用于与远程接入点进行无线通信的用户终端可以包括映射模块，延迟模块，发射模块和定向天线。 映射模块可用于将一个或多个输入数据位映射到上行链路符号。 延迟模块可用于向上行链路符号应用延迟。 发射模块可用于将延迟符号调制成频道。 定向天线可以沿着接入点的主要路径定向，并且天线用于将调制符号发送到接入点。 选择延迟使得所发送的符号与调制到频率信道中并由另一用户终端发送的另一符号同时到达接入点。

公开(公告)号：US20100142598A1

公开(公告)日：2010-06-10

申请号：US12517742

申请日：2007-09-25

申请人： Boyd McGregor Murray ,  David Andrew Abbott ,  Joseph Abraham Pathikulangara ,  John Bunton ,  Valeriy Dyadyuk

发明人： Boyd McGregor Murray ,  David Andrew Abbott ,  Joseph Abraham Pathikulangara ,  John Bunton ,  Valeriy Dyadyuk

IPC分类号： H04B1/38 ,  H04L27/00 ,  H04L27/36

CPC分类号： H04B1/0483 ,  H04L5/0007 ,  H04L25/03834 ,  H04L27/0014 ,  H04L27/2637 ,  H04L27/2653 ,  H04L2027/0024 ,  H04L2027/0067

摘要： A circuit for transmission and reception of multi-channel communications is disclosed. The transmitter path includes a digital modulation circuit receiving multiple channel binary data, and for each channel generating a digital representation of the data. A digital-to-analogue (D/A) conversion circuit (140-146) is provided for each data channel. Each D/A conversion circuit receives and converts respective channel digital representations to produce a resultant band limited analogue signal (148-154). The band limitation arises due to a characteristic of said channel digital representations. A bandpass filter (156-162) receives and filters each analogue channel signal. The band width to the start of the stop band of each bandpass filter is wider than a respective band limited analogue channel signal and wider than the Nyquist bandwidth arising from the sampling rate of said D/A conversion circuit. In this way, signal power in unwanted Nyquist zones is effectively removed. A frequency translation circuit (172-188) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.

摘要翻译： 公开了一种用于多信道通信的发送和接收的电路。 发射机路径包括接收多信道二进制数据的数字调制电路，以及产生数据的数字表示的每个信道。 为每个数据通道提供数模（D / A）转换电路（140-146）。 每个D / A转换电路接收和转换相应的通道数字表示以产生合成的频带限制模拟信号（148-154）。 频带限制由于所述信道数字表示的特征而产生。 带通滤波器（156-162）接收并滤波每个模拟信道信号。 每个带通滤波器的阻带开始的带宽比相应的带限模拟信道信号宽，并且宽于由所述D / A转换电路的采样率产生的奈奎斯特带宽。 以这种方式，有效地消除了不需要的奈奎斯特地区的信号功率。 频率转换电路（172-188）在频域中邻接多通道带通滤波的模拟信号，而在相邻信道信号之间没有任何保护带。

公开(公告)号：US08379698B2

公开(公告)日：2013-02-19

申请号：US12517742

申请日：2007-09-25

申请人： Boyd McGregor Murray ,  David Andrew Abbott ,  Joseph Abraham Pathikulangara ,  John Bunton ,  Valeriy Dyadyuk

发明人： Boyd McGregor Murray ,  David Andrew Abbott ,  Joseph Abraham Pathikulangara ,  John Bunton ,  Valeriy Dyadyuk

IPC分类号： H04B1/38

CPC分类号： H04B1/0483 ,  H04L5/0007 ,  H04L25/03834 ,  H04L27/0014 ,  H04L27/2637 ,  H04L27/2653 ,  H04L2027/0024 ,  H04L2027/0067

摘要： A circuit for transmission and reception of multi-channel communications is disclosed. The transmitter path includes a digital modulation circuit receiving multiple channel binary data, and for each channel generating a digital representation of the data. A digital-to-analogue (D/A) conversion circuit (140-146) is provided for each data channel. Each D/A conversion circuit receives and converts respective channel digital representations to produce a resultant band limited analogue signal (148-154). The band limitation arises due to a characteristic of said channel digital representations. A bandpass filter (156-162) receives and filters each analogue channel signal. The band width to the start of the stop band of each bandpass filter is wider than a respective band limited analogue channel signal and wider than the Nyquist bandwidth arising from the sampling rate of said D/A conversion circuit. In this way, signal power in unwanted Nyquist zones is effectively removed. A frequency translation circuit (172-188) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.

摘要翻译： 公开了一种用于多信道通信的发送和接收的电路。 发射机路径包括接收多信道二进制数据的数字调制电路，以及产生数据的数字表示的每个信道。 为每个数据通道提供数模（D / A）转换电路（140-146）。 每个D / A转换电路接收和转换相应的通道数字表示以产生合成的频带限制模拟信号（148-154）。 频带限制由于所述信道数字表示的特征而产生。 带通滤波器（156-162）接收并滤波每个模拟信道信号。 每个带通滤波器的阻带开始的带宽比相应的带限模拟信道信号宽，并且宽于由所述D / A转换电路的采样率产生的奈奎斯特带宽。 以这种方式，有效地消除了不需要的奈奎斯特地区的信号功率。 频率转换电路（172-188）在频域中邻接多通道带通滤波的模拟信号，而在相邻信道信号之间没有任何保护带。