公开(公告)号：US07747225B2

公开(公告)日：2010-06-29

申请号：US11538432

申请日：2006-10-03

申请人： Fan Wang ,  Stanley J. Benes ,  Amitava Ghosh ,  Jun Tan

发明人： Fan Wang ,  Stanley J. Benes ,  Amitava Ghosh ,  Jun Tan

IPC分类号： H04B17/00 ,  H04B1/00 ,  H04B7/00 ,  H04B7/185 ,  H04M1/00 ,  H04W4/00

CPC分类号： H01Q3/30 ,  H01Q3/2605 ,  H04B7/0634 ,  H04B7/0636 ,  H04L5/14 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/03343 ,  H04L2025/03426

摘要： A subscriber unit (104) with multiple receive antennas (160, 162) and a single transmit antenna (160) derives beamforming weights to be used at a base station (102) with multiple transmitting antennas (602, 604, 606, and 608). The downlink beamforming weights are derived at the subscriber unit (104) from a prior downlink transmission from the base station (102) to the subscriber device (104) and an uplink sounding signal is used to carry derived downlink beam forming weights to the base station (102). Downlink antenna specific pilots (without weight) are used at the subscriber device (104) to determine the beamforming weights. Decimated sounding signals, where the number of sounding subcarriers is at least the same as the number of antennas at the base station (102), allow multiple users to sound at the same time.

摘要翻译： 具有多个接收天线（160,162）和单个发射天线（160）的用户单元（104）导出要在具有多个发射天线（602,604,606和608）的基站（102）处使用的波束成形权重， 。 下行链路波束形成权重在订户单元（104）处从从基站（102）到用户设备（104）的先前下行链路传输导出，并且上行链路探测信号用于将导出的下行链路波束形成权重携带到基站 （102）。 在订户设备（104）处使用下行链路天线特定导频（无权重）来确定波束成形权重。 抽取的探测信号，其中发声子载波的数量与基站（102）上的天线数量至少相同，允许多个用户同时发声。

公开(公告)号：US20090154605A1

公开(公告)日：2009-06-18

申请号：US11954998

申请日：2007-12-12

申请人： Jun Tan ,  Amitava Ghosh ,  Fan Wang

发明人： Jun Tan ,  Amitava Ghosh ,  Fan Wang

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L25/067 ,  H04L25/0204 ,  H04L27/2647

摘要： A method, wireless device, and wireless communication system perform Maximum Likelihood Detection. At least one data signal is accepting on at least one communication channel (604). The data signal is modulated with a plurality of transmitted bit values. The at least one data signal is sampled in a characteristic function domain of the data signal to produce characteristic function samples (608). A probability density function associated with the at least one data signal is determined, based upon the characteristic function samples (610). Soft decision values are determined, based upon the probability density function, for each transmitted bit value for each dimension of the at least one data signal (612).

摘要翻译： 方法，无线设备和无线通信系统执行最大似然检测。 至少一个数据信号在至少一个通信信道上接受（604）。 数据信号用多个发送的比特值进行调制。 所述至少一个数据信号在所述数据信号的特征功能域中被采样以产生特征函数样本（608）。 基于特征函数样本（610）确定与至少一个数据信号相关联的概率密度函数。 基于所述概率密度函数，针对所述至少一个数据信号（612）的每个维度的每个发送的比特值来确定软判决值。

公开(公告)号：US5945948A

公开(公告)日：1999-08-31

申请号：US706751

申请日：1996-09-03

申请人： Kevin A. Buford ,  John D. Reed ,  Walter J. Rozanski, Jr. ,  Amitava Ghosh

发明人： Kevin A. Buford ,  John D. Reed ,  Walter J. Rozanski, Jr. ,  Amitava Ghosh

IPC分类号： G01S3/02 ,  G01S5/02 ,  G01S5/04 ,  G01S5/12 ,  G01S19/14 ,  H04W64/00

CPC分类号： H04W64/00 ,  G01S5/021 ,  G01S5/0215 ,  G01S5/04 ,  G01S5/12 ,  G01S5/0294

摘要： A method for determining a subscriber unit location in a communication system is provided. The method includes the steps of receiving a signal from the subscriber unit at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.

摘要翻译： 提供了一种用于确定通信系统中的用户单元位置的方法。 该方法包括以下步骤：在第一基站从用户单元接收信号，基于第一基站处的扩展符号序列确定信号的第一接收时间，确定信号的第一到达角度 第一基站，以及从第一接收时间，第一入射角度以及关于第一基站的其它预定信息确定用户单元的位置。 该信号通过扩展符号序列的调制形成。

公开(公告)号：US5727028A

公开(公告)日：1998-03-10

申请号：US690606

申请日：1996-07-31

申请人： Amitava Ghosh ,  Kamyar Rohani

发明人： Amitava Ghosh ,  Kamyar Rohani

IPC分类号： H04B1/707 ,  H04L27/227 ,  H04L27/06 ,  H03D1/00

CPC分类号： H04L27/2278 ,  H04B1/707

摘要： The apparatus includes a demodulator (70) responsive to a first received symbol (68) associated with a first transmitted symbol (39). The demodulator has a plurality of outputs (72) and produces a first set of outputs (99). The demodulator (70) is also responsive to a second received symbol (68) associated with a second transmitted symbol (39), and produces a second set of outputs (99). A coherent detector (100) receives some outputs from the first set of outputs (99), producing an estimate of the first transmitted symbol. The coherent detector also receives some outputs from the second set of outputs (99), producing an estimate of the second transmitted symbol. A first energy value (135) and an index (101) are associated with the first estimate, while a second energy value (135) is associated with the second estimate. A averaging circuit (150), which determines an average of the first energy value (135) and the second energy value (135) to produce an average energy value (140), is responsive to the coherent detector (100). A first combiner (130) is responsive to the coherent detector (100), combining the index (101) and the first energy value (135) to produce a weighted index (131). A second combiner (133) is responsive to the averaging circuit (150) and is also responsive to the first combiner (130), combining the weighted index (131) and the average energy value (140) to produce a channel-coded index (141). A deinterleaver (80) is responsive to the second combiner (133), receiving the channel-coded index (141).

摘要翻译： 该装置包括响应于与第一发送符号（39）相关联的第一接收符号（68）的解调器（70）。 解调器具有多个输出（72）并产生第一组输出（99）。 解调器（70）还响应与第二发送符号（39）相关联的第二接收符号（68），并产生第二组输出（99）。 相干检测器（100）从第一组输出（99）接收一些输出，产生第一发射符号的估计。 相干检测器还从第二组输出（99）接收一些输出，产生第二发射符号的估计。 第一能量值（135）和索引（101）与第一估计相关联，而第二能量值（135）与第二估计相关联。 确定平均能量值（135）和第二能量值（135）以产生平均能量值（140）的平均电路（150）响应于相干检测器（100）。 第一组合器（130）响应于相干检测器（100），组合索引（101）和第一能量值（135）以产生加权索引（131）。 第二组合器（133）响应于平均电路（150）并且还响应于第一组合器（130），组合加权索引（131）和平均能量值（140）以产生信道编码索引（ 141）。 解交织器（80）响应于第二组合器（133），接收信道编码索引（141）。

公开(公告)号：US5508708A

公开(公告)日：1996-04-16

申请号：US436760

申请日：1995-05-08

申请人： Amitava Ghosh ,  John D. Reed ,  Walter J. Rozanski, Jr. ,  Kevin A. Buford

发明人： Amitava Ghosh ,  John D. Reed ,  Walter J. Rozanski, Jr. ,  Kevin A. Buford

IPC分类号： H04W36/32 ,  G01S5/14 ,  G01S19/09 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  G01S3/02

CPC分类号： H04W64/00 ,  G01S5/14 ,  G01S5/145

摘要： A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.

摘要翻译： 用于确定CDMA系统中的通信单元的位置的方法和装置包括在第一实施例中，经由扩展频谱信号向订户（140）发送定位请求，并且接收接收到包括响应消息的用户信号，该响应消息显示 基站扩展序列的特定符号的接收时间和用户扩频序列的特定符号的发送时间。 基站（130）以及其他接收基站（140）也接收用户扩频序列的预定符号，并且各自确定预定符号的相应接收时间。 然后接收的信息与已知的基本位置和延迟信息一起被处理以确定用户位置。 如果足够数量的基站能够与用户通信，例如由于高负载/干扰，辅助基站（121）也被提供用于从用户接收或传送给用户。

公开(公告)号：US07489755B2

公开(公告)日：2009-02-10

申请号：US11054290

申请日：2005-02-09

申请人： Fan Wang ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

发明人： Fan Wang ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

IPC分类号： H04L7/00

CPC分类号： H04L25/03159 ,  H04B2201/70701 ,  H04J13/00 ,  H04L1/08 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03522

摘要： Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.

摘要翻译： 描述了各种实施例以提供以改进的方式发送和接收数据。 通过在发射机中包括空生成器（110）来生成输出数据符号序列来改进数据传输，该输出数据符号序列在输入数据符号序列没有的特定频率处在频域中呈现零点。 导频插入器（120）然后将导频符号序列添加到该输出数据符号序列以创建组合符号序列。 由于导频符号序列呈现与频域中的输出数据符号序列的零点相对应的导频信号，组合符号序列表现出与频域中的数据正交的导频。

公开(公告)号：US07477699B2

公开(公告)日：2009-01-13

申请号：US11613349

申请日：2006-12-20

申请人： Fan Wang ,  Lawrence A. Downing ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

发明人： Fan Wang ,  Lawrence A. Downing ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04B7/0689 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0669 ,  H04B7/0697 ,  H04H20/22 ,  H04H60/11

摘要： A radio communications device (102) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device (104) that has multiple transmit antennas. A channel throughput (402-412, 450-454) for each transmission technique is estimated based on signal to interference and noise ratios (502-512, 550-554) of signals being transmitted through a MIMO channel (140) as measured by a receiver (708). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.

摘要翻译： 具有多个接收天线的无线电通信设备（102）处理接收到的数据通信信号，以从具有多个发射天线的基站设备（104）中选择在空间时间编码和空间复用之间作为所选择的传输技术。 基于通过MIMO信道（140）发送的信号的信号与干扰和噪声比（502-512,55-554）来估计用于每个传输技术的信道吞吐量（402-412,450-454），如 接收器（708）。 确定具有较高估计吞​​吐量的传输技术。 如果确定空间复用具有较高的估计吞吐量，并且空间复用信号的每层的吞吐量大于阈值，则选择空间复用。 否则，选择空时编码。

公开(公告)号：US20080151804A1

公开(公告)日：2008-06-26

申请号：US11613349

申请日：2006-12-20

申请人： Fan Wang ,  Lawrence A. Downing ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

发明人： Fan Wang ,  Lawrence A. Downing ,  Amitava Ghosh ,  Chandrasekar Sankaran ,  Jun Tan

IPC分类号： H04H20/71 ,  G06F11/14 ,  H04J15/00 ,  G08C25/02

CPC分类号： H04B7/0689 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0669 ,  H04B7/0697 ,  H04H20/22 ,  H04H60/11

摘要： A radio communications device (102) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device (104) that has multiple transmit antennas. A channel throughput (402-412, 450-454) for each transmission technique is estimated based on signal to interference and noise ratios (502-512, 550-554) of signals being transmitted through a MIMO channel (140) as measured by a receiver (708). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.

摘要翻译： 具有多个接收天线的无线电通信设备（102）处理接收到的数据通信信号，以从具有多个发射天线的基站设备（104）中选择在空间时间编码和空间复用之间作为所选择的传输技术。 基于通过MIMO信道（140）发送的信号的信号与干扰和噪声比（502-512,550-554）来估计用于每个传输技术的信道吞吐量（402-412,450-445），如 接收器（708）。 确定具有较高估计吞​​吐量的传输技术。 如果确定空间复用具有较高的估计吞吐量，并且空间复用信号的每层的吞吐量大于阈值，则选择空间复用。 否则，选择空时编码。

公开(公告)号：US06678523B1

公开(公告)日：2004-01-13

申请号：US09705850

申请日：2000-11-03

申请人： Amitava Ghosh ,  Louay Jalloul

发明人： Amitava Ghosh ,  Louay Jalloul

IPC分类号： H04Q720

CPC分类号： H04L1/1845 ,  H04L1/1812 ,  H04W36/18

摘要： A method of combining soft-handoff with a hybrid ARQ scheme to maximize throughput and gain in a communications system. After receiving a frame from the MS (110), the BTSs (104 and 106) will process the frame and communicate to the MS over a forward control channel whether the frame contained any errors. If all BTSs communicate that the frame contains errors, the MS will retransmit the same frame to all BTSs with a flush bit set to instruct the BTSs 104 and 106 to combine the retransmitted frame with the original frame. If only some BTSs communicate that the frame contains errors, the MS will transmit the next frame to all BTSs that successfully decoded the frame with the flush bit set to instruct the BTSs to erase the previous frame from memory and not to combine the previous frame with the current frame. The MS will retransmit the frame to the BTSs that did not successfully decode the frame with the flush bit set to instruct the BTSs to combine the previous frame with the retransmitted frame.

摘要翻译： 一种将软切换与混合ARQ方案组合以最大化通信系统中的吞吐量和增益的方法。 在从MS（110）接收到帧之后，BTS（104和106）将处理该帧并且通过前向控制信道与MS通信该帧是否包含任何错误。 如果所有的BTS都通信帧包含错误，则MS将重新发送相同的帧到所有的BTS，其中设置一个刷新比特，以指示BTS 104和106将重发帧与原始帧组合。 如果只有一些BTS通信帧包含错误，则MS将向成功解码帧的所有BTS发送下一帧，该闪存位被设置为指示BTS从存储器擦除先前帧，而不将前一帧与 当前框架。 MS将重新发送帧到没有成功解码帧的BTS，其中设置了刷新比特，以指示BTS将前一帧与重发帧组合。

公开(公告)号：US06253063B1

公开(公告)日：2001-06-26

申请号：US09490606

申请日：2000-01-25

申请人： Mark C. Cudak ,  Brian K. Classon ,  Louay A. Jalloul ,  Amitava Ghosh ,  Robert T. Love

发明人： Mark C. Cudak ,  Brian K. Classon ,  Louay A. Jalloul ,  Amitava Ghosh ,  Robert T. Love

IPC分类号： H04B100

CPC分类号： H04W28/22 ,  H04L1/0002 ,  H04L1/0025 ,  H04W16/14

摘要： A mobile station (110) selects an initial data rate for communication between base station (107) and mobile station (110). Mobile station (110) communicates the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rate was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.

摘要翻译： 移动台（110）为基站（107）和移动台（110）之间的通信选择初始数据速率。 移动站（110）通过上行链路（112）将所选择的初始数据速率传送到基站（107）。 基站（107）确定移动台（110）在初始数据速率被移动台（110）选择的时间与基站（107）准备与移动台通信的时间之间的移动台（107）所经历的干扰状况的差异水平 （110）。 基站（107）基于所确定的干扰条件差异来选择用于从基站（107）到移动台（110）的传输的最终数据速率。 因此，可以将最初的数据速率修改为最终数据速率，同时最大化下行链路容量。