公开(公告)号：US07181666B2

公开(公告)日：2007-02-20

申请号：US10426546

申请日：2003-04-29

申请人： Matt Grob ,  Avneesh Agrawal ,  Arak Sutivong

发明人： Matt Grob ,  Avneesh Agrawal ,  Arak Sutivong

IPC分类号： G08C25/02 ,  G08C25/04

CPC分类号： H04B7/2656 ,  H04L1/1887 ,  H04L2001/0096

摘要： According to one aspect of the invention, a method is provided in which a group of users in a system that employs a retransmission mechanism such as Automatic Repeat Request (ARQ) is divided into multiple sub-groups of users. Each user is assigned a number of channels for transmission of information. The number of channels assigned to each user is determined based, at least in part, on the number of the sub-groups and a number of channels available in the system. Transmission intervals are alternated among the multiple sub-groups such that only one of the sub-groups of users is allowed to transmit information during any transmission interval. An idle interval during which a particular user in the first group does not transmit information is used as a waiting period for acknowledgement of a previous transmission by the particular user.

摘要翻译： 根据本发明的一个方面，提供一种方法，其中使用诸如自动重传请求（ARQ）的重传机制的系统中的一组用户被划分为多个用户子组。 为每个用户分配了多个信道用于传输信息。 至少部分地基于子系统的数量和系统中可用的通道的数量来确定分配给每个用户的频道数量。 在多个子组之间交替发送间隔，使得只有一个用户子组被允许在任何发送间隔期间发送信息。 第一组中的特定用户不发送信息的空闲间隔被用作特定用户对先前发送的确认的等待时段。

公开(公告)号：US20050283715A1

公开(公告)日：2005-12-22

申请号：US10890717

申请日：2004-07-13

申请人： Arak Sutivong ,  Avneesh Agrawal ,  David Julian

发明人： Arak Sutivong ,  Avneesh Agrawal ,  David Julian

IPC分类号： H04B7/005 ,  H04L1/00 ,  H04L1/20 ,  H03M13/03

CPC分类号： H04L1/0045 ,  H04L1/0057 ,  H04L1/20 ,  H04W52/125 ,  H04W52/20

摘要： Techniques for performing erasure detection and power control for a transmission without error detection coding are described. For erasure detection, a transmitter transmits codewords via a wireless channel. A receiver computes a metric for each received codeword, compares the computed metric against an erasure threshold, and declares the received codeword to be “erased” or “non-erased”. The receiver dynamically adjusts the erasure threshold based on received known codewords to achieve a target level of performance. For power control, an inner loop adjusts the transmit power to maintain a received signal quality (SNR) at a target SNR. An outer loop adjusts the target SNR based on the status of received codewords (erased or non-erased) to achieve a target erasure rate. A third loop adjusts the erasure threshold based on the status of received known codewords (“good”, “bad”, or erased) to achieve a target conditional error rate.

摘要翻译： 描述了用于对没有错误检测编码的传输进行擦除检测和功率控制的技术。 为了擦除检测，发射机经由无线信道发送码字。 接收机计算每个接收到的码字的度量，将所计算的度量与擦除阈值进行比较，并且将所接收的码字声明为“擦除”或“未擦除”。 接收机基于接收到的已知码字来动态地调整擦除阈值，以实现目标性能水平。 对于功率控制，内部环路调整发射功率以将接收信号质量（SNR）保持在目标SNR。 外部环路基于接收到的码字（擦除或未擦除）的状态来调整目标SNR以实现目标擦除率。 第三循环基于接收的已知码字的状态（“好”，“坏”或被擦除）来调整擦除阈值，以实现目标条件错误率。

公开(公告)号：US20050002324A1

公开(公告)日：2005-01-06

申请号：US10809538

申请日：2004-03-24

申请人： Arak Sutivong ,  Ayman Naguib ,  Avneesh Agrawal

发明人： Arak Sutivong ,  Ayman Naguib ,  Avneesh Agrawal

IPC分类号： G01H20060101 ,  H04J11/00 ,  H04L1/20 ,  H04L27/26

CPC分类号： H04L1/20 ,  H04L27/2647

摘要： Noise and interference can be independently measured in a multiple user Orthogonal Frequency Division Multiplexing (OFDM) system. Co-channel interference is measured in a frequency hopping, multiple user, OFDM system by tracking the sub-carriers assigned to all users in a particular service area or cell. The composite noise plus interference can be determined by measuring the amount of received power in a sub-carrier whenever it is not assigned to any user in the cell. A value is stored for each sub-carrier in the system and the value of noise plus interference can be a weighted average of the present value with previously stored values. The noise component can be independently determined in a synchronous system. In the synchronous system, all users in a system may periodically be prohibited from broadcasting over a sub-carrier and the received power in the sub-carrier measured during the period having no broadcasts.

摘要翻译： 噪声和干扰可以在多用户正交频分复用（OFDM）系统中独立测量。 通过跟踪分配给特定服务区域或小区中的所有用户的子载波，在跳频，多用户OFDM系统中测量同信道干扰。 复合噪声加干扰可以通过在子载波中没有分配给小区中的任何用户时测量子载波中的接收功率的量来确定。 为系统中的每个子载波存储一个值，并且噪声加干扰的值可以是具有先前存储的值的当前值的加权平均值。 噪声分量可以在同步系统中独立确定。 在同步系统中，系统中的所有用户可以周期地禁止通过子载波进行广播，并且在没有广播的时段期间测量的子载波中的接收功率。

公开(公告)号：US08831115B2

公开(公告)日：2014-09-09

申请号：US11022145

申请日：2004-12-22

申请人： Arak Sutivong ,  Avneesh Agrawal

发明人： Arak Sutivong ,  Avneesh Agrawal

IPC分类号： H04L27/28 ,  H04J11/00

CPC分类号： H04L5/0021 ,  H04B1/692 ,  H04B1/713 ,  H04J13/18

摘要： Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

公开(公告)号：US08730877B2

公开(公告)日：2014-05-20

申请号：US11242115

申请日：2005-09-30

申请人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

发明人： Ravi Palanki ,  Aamod Khandekar ,  Arak Sutivong

IPC分类号： H04W4/00

CPC分类号： H04B7/04 ,  H04L1/1819 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/0256

摘要： In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA, multiple transmitters may transmit their pilots using time division multiplexing (TDM), code division multiplexing (CDM), interleaved frequency division multiplexing (IFDM), or localized frequency division multiplexing (LFDM). The pilots from these transmitters are then orthogonal to one another. A receiver performs the complementary demultiplexing for the pilots sent by the transmitters. The receiver may derive a channel estimate for each transmitter using an MMSE technique or a least-squares technique. The receiver may receive overlapping data transmissions sent on the same time-frequency block by the multiple transmitters and may perform receiver spatial processing with spatial filter matrices to separate these data transmissions. The receiver may derive the spatial filter matrices based on the channel estimates for the transmitters and using zero-forcing, MMSE, or maximal ratio combining technique.

摘要翻译： 在采用交织FDMA（IFDMA）或集中式FDMA的单载波频分多址（SC-FDMA）系统中，多个发射机可以使用时分多路复用（TDM），码分多路复用（CDM），交错分频 复用（IFDM）或局部频分复用（LFDM）。 来自这些发射机的飞行员然后彼此正交。 接收机对由发射机发送的导频进行互补解复用。 接收机可以使用MMSE技术或最小二乘法来为每个发射机导出信道估计。 接收机可以接收由多个发射机在相同时间频率块上发送的重叠数据传输，并且可以利用空间滤波器矩阵来执行接收机空间处理以分离这些数据传输。 接收机可以基于发射机的信道估计和使用零强制，MMSE或最大比组合技术导出空间滤波器矩阵。

公开(公告)号：US08649451B2

公开(公告)日：2014-02-11

申请号：US13090220

申请日：2011-04-19

申请人： Arak Sutivong ,  Avneesh Agrawal

发明人： Arak Sutivong ,  Avneesh Agrawal

IPC分类号： H04L27/28 ,  H04J11/00

CPC分类号： H04L5/0021 ,  H04B1/692 ,  H04B1/713 ,  H04J13/18

摘要： Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

摘要翻译： 提供技术来支持无线通信系统的正交上行链路中的多载波码分多址（MC-CDMA）。 一种无线多载波通信的方法，包括将上行链路上的子载波划分为非重叠组，分别分配包括跳频持续时间和非重叠组的时间块，将不同的正交码组分配给每个 用户，在所分配的时间频率块上扩展每个用户的数据（或导频）符号，其中每个用户的数据（或导频）符号使用分配给每个用户的不同的正交码集进行扩展，映射每个数据（或 导频）符号到时间 - 频率块中的调制符号，基于映射符号生成正交波形，并发送正交波形。

公开(公告)号：US08416745B2

公开(公告)日：2013-04-09

申请号：US11507715

申请日：2006-08-21

申请人： David Jonathan Julian ,  Arak Sutivong

发明人： David Jonathan Julian ,  Arak Sutivong

IPC分类号： H04W4/00 ,  H04B7/00 ,  H04B7/216

CPC分类号： H04W52/36 ,  H04W52/14 ,  H04W52/146 ,  H04W52/16 ,  H04W52/246 ,  H04W52/267 ,  H04W52/325 ,  H04W52/40

摘要： Systems and methodologies are described that facilitate performing scalable transmission power offsets for an access terminal to ensure that a listening base station can hear a signal transmitted from the access terminal. The power offset is generated as a function of a reverse link channel quality indicator feedback loop to permit the access terminal to adjust transmission power sufficiently without excessive power boosting, such as can occur under a static power-boosting scheme. Monitored parameters associated with channel quality indications may comprise erasure rate indicators provided by base stations in response to CQI signals from the access terminal, as well as mean received power levels associated with superframe preamble received at the access terminal.

摘要翻译： 描述了便于对接入终端执行可扩展发射功率偏移的系统和方法，以确保监听基站能够听到从接入终端发送的信号。 产生功率偏移作为反向链路信道质量指示符反馈回路的函数，以允许接入终端充分调整发射功率，而不需要过多的功率提升，例如在静态功率增强方案下可能发生的功率偏移。 与信道质量指示相关联的监视参数可以包括响应于来自接入终端的CQI信号的基站提供的擦除率指示符以及与在接入终端处接收的超帧前缀相关联的平均接收功率电平。

公开(公告)号：US08228949B2

公开(公告)日：2012-07-24

申请号：US12762750

申请日：2010-04-19

申请人： Arak Sutivong ,  Avneesh Agrawal

发明人： Arak Sutivong ,  Avneesh Agrawal

IPC分类号： H04J13/00

CPC分类号： H04L5/023 ,  H04B1/7143 ,  H04J13/00 ,  H04L5/0023 ,  H04L5/003 ,  H04L5/0042

摘要： For quasi-orthogonal multiplexing in an OFDMA system, multiple (M) sets of traffic channels are defined for each base station. The traffic channels in each set are orthogonal to one another and may be pseudo-random with respect to the traffic channels in each of the other sets. The minimum number of sets of traffic channels (L) is used to support a given number of (U) terminals selected for data transmission, where M≧L≧1 and U≧1. Each terminal transmits data and pilot symbols on its traffic channel. A base station receives data transmissions from all terminals and may perform receiver spatial processing on received symbols with spatial filter matrices to obtain detected data symbols. The spatial filter matrix for each subband may be derived based on channel response estimates for all terminals transmitting on that subband.

摘要翻译： 对于OFDMA系统中的准正交复用，为每个基站定义多个（M）个业务信道集合。 每组中的业务信道彼此正交，并且可以相对于每个其他集合中的业务信道是伪随机的。 交通信道数（L）的最小数量用于支持选择用于数据传输的给定数量的（U）终端，其中M≥L≥1且U≥1。 每个终端在其业务信道上发送数据和导频符号。 基站从所有终端接收数据传输，并且可以利用空间滤波器矩阵对接收符号执行接收机空间处理，以获得检测到的数据符号。 可以基于在该子带上传输的所有终端的信道响应估计来导出每个子带的空间滤波器矩阵。

公开(公告)号：US20120087336A1

公开(公告)日：2012-04-12

申请号：US13327946

申请日：2011-12-16

申请人： Arak Sutivong ,  Aveneesh Agrawal

发明人： Arak Sutivong ,  Aveneesh Agrawal

IPC分类号： H04W72/04 ,  H04B7/216

CPC分类号： H04L5/0021 ,  H04B1/692 ,  H04B1/713 ,  H04J13/18

摘要： Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

摘要翻译： 提供技术来支持无线通信系统的正交上行链路中的多载波码分多址（MC-CDMA）。 一种无线多载波通信的方法，包括将上行链路上的子载波划分为非重叠组，分别分配包括跳频持续时间和非重叠组的时间块，将不同的正交码组分配给每个 用户，在所分配的时间频率块上扩展每个用户的数据（或导频）符号，其中每个用户的数据（或导频）符号使用分配给每个用户的不同的正交码集进行扩展，映射每个数据（或 导频）符号到时间 - 频率块中的调制符号，基于映射符号生成正交波形，并发送正交波形。

公开(公告)号：US07990911B2

公开(公告)日：2011-08-02

申请号：US11317868

申请日：2005-12-22

申请人： Arak Sutivong ,  Avneesh Agrawal ,  Edward Harrison Teague

发明人： Arak Sutivong ,  Avneesh Agrawal ,  Edward Harrison Teague

IPC分类号： H04W4/00

CPC分类号： H04L1/1829 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/1816 ,  H04L1/1819 ,  H04L2001/125

摘要： A method and apparatus to determine whether a transmission was successfully received in a multiple access communication system is claimed. First and second encoded data packets are received and decoded. The first and second data packets are then re-encoded, and correlated to determine whether the first and second re-encoded data packets are the same. If there is a high degree of correlation, an indicator of acknowledgement is transmitted to indicate that there is a high degree of correlation between the first and second re-encoded data packets. If there is a low degree of correlation, a determination is made that the previously transmitted indicator of acknowledgement was correctly received.

摘要翻译： 要求确定在多址通信系统中是否成功接收到传输的方法和装置。 第一和第二编码数据分组被接收和解码。 然后对第一和第二数据分组进行重新编码，并进行相关，以确定第一和第二重新编码的数据分组是否相同。 如果存在高度的相关性，则发送确认的指示符以指示第一和第二重新编码的数据分组之间存在高度的相关性。 如果存在低度的相关性，则确定先前发送的确认指示符被正确地接收。