公开(公告)号：US20070150799A1

公开(公告)日：2007-06-28

申请号：US11676563

申请日：2007-02-20

申请人： Arak Sutivong ,  Avneesh Agrawal ,  David Julian

发明人： Arak Sutivong ,  Avneesh Agrawal ,  David Julian

IPC分类号： 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，并将接收的码字声明为“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：US20070070928A1

公开(公告)日：2007-03-29

申请号：US11507787

申请日：2006-08-21

申请人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04B7/00 ,  H04B3/10

CPC分类号： H04W52/325 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0632

摘要： Systems and methodologies are described that facilitate providing auxiliary multiple-input, multiple-output (MIMO) pilot signals to MIMO user devices in a wireless communication environment. According to some aspects, a portion of data transmission power may be reallocated for auxiliary MIMO pilot transmission during a data segment in a time slot, in order to permit a MIMO user device to perform CQI and rank prediction. Additionally or alternatively, non-MIMO pilot transmission power may be reallocated in a pilot segment in the time slot for transmission of an auxiliary MIMO pilot signal to permit the MIMO user device to demodulate data transmitted in data segments of the time slot. MIMO pilot signals may additionally be time-division multiplexed within or across time slots and may be transmitted over available Walsh codes in data and control segments.

摘要翻译： 描述了有助于在无线通信环境中向MIMO用户设备提供辅助多输入多输出（MIMO）导频信号的系统和方法。 根据一些方面，可以在时隙中的数据段期间重新分配一部分数据发送功率用于辅助MIMO导频传输，以便允许MIMO用户设备执行CQI和秩预测。 附加地或替代地，可以在时隙中的导频段中重新分配非MIMO导频传输功率，以传输辅助MIMO导频信号，以允许MIMO用户设备解调在该时隙的数据段中发送的数据。 MIMO导频信号可以另外在时隙内或跨时隙进行时分复用，并且可以在数据和控制段中通过可用的沃尔什码传输。

公开(公告)号：US20060133522A1

公开(公告)日：2006-06-22

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： H04K1/10

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：US20060072604A1

公开(公告)日：2006-04-06

申请号：US11129636

申请日：2005-05-13

申请人： Arak Sutivong ,  Avneesh Agrawal ,  Alexei Gorokhov ,  Edward Teague

发明人： Arak Sutivong ,  Avneesh Agrawal ,  Alexei Gorokhov ,  Edward Teague

IPC分类号： H04J3/16

CPC分类号： H04W74/04 ,  H04W74/002

摘要： Pilots are transmitted on demand on a reverse link and used for channel estimation and data transmission on a forward link. A base station selects at least one terminal for on-demand pilot transmission on the reverse link. Each selected terminal is a candidate for receiving data transmission on the forward link. The base station assigns each selected terminal with a time-frequency allocation, which may be for a wideband pilot, a narrowband pilot, or some other type of pilot. The base station receives and processes on-demand pilot transmission from each selected terminal and derives a channel estimate for the terminal based on the received pilot transmission. The base station may schedule terminals for data transmission on the forward link based on the channel estimates for all selected terminals. The base station may also process data (e.g., perform beamforming or eigensteering) for transmission to each scheduled terminal based on its channel estimate.

摘要翻译： 飞行员根据需要在反向链路上传输，用于前向链路上的信道估计和数据传输。 基站在反向链路上选择至少一个用于按需导频发送的终端。 每个选择的终端是用于在前向链路上接收数据传输的候选者。 基站为每个选择的终端分配时间频率分配，其可以用于宽带导频，窄带导频或某种其他类型的导频。 基站从每个所选终端接收并处理按需导频传输，并根据接收到的导频传输导出终端的信道估计。 基站可以基于所有选择的终端的信道估计来安排在前向链路上进行数据传输的终端。 基站还可以基于其信道估计来处理数据（例如，执行波束成形或本征导向）以传输到每个调度的终端。

公开(公告)号：US07012911B2

公开(公告)日：2006-03-14

申请号：US09871563

申请日：2001-05-31

申请人： Nitin Kasturi ,  Rajat Rajinderkumar Dhawan ,  Daisuke Terasawa ,  Avneesh Agrawal ,  Arak Sutivong

发明人： Nitin Kasturi ,  Rajat Rajinderkumar Dhawan ,  Daisuke Terasawa ,  Avneesh Agrawal ,  Arak Sutivong

IPC分类号： H04B7/20 ,  H04J3/02 ,  H04Q7/00

CPC分类号： H04L1/0071 ,  H04J13/00 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/08

摘要： Techniques for efficient W-CDMA modulation are disclosed. In one aspect, a multiplexing/coding chain for use in modulation such as that defined by the W-CDMA specification is disclosed. In another aspect, transport blocks are processed and concatenated, utilizing memory efficiently. This aspect has the further benefit of preparing transport channels for efficient subsequent processing. It also allows for ease of interface with the transport channel source. In another aspect, the use of repeated channel coding is used in lieu of an interleaver memory to provide channel coding and interleaving. These aspects, collectively, yield the advanced benefits of a system, such as W-CDMA, in a hardware efficient manner. The techniques described herein apply equally to both access points and access terminals. The techniques are not limited to W-CDMA systems; they are quite suitable to other systems requiring the various benefits the invention offers. Various other aspects of the invention are also presented.

公开(公告)号：US08638870B2

公开(公告)日：2014-01-28

申请号：US13327946

申请日：2011-12-16

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：US08179876B2

公开(公告)日：2012-05-15

申请号：US11315743

申请日：2005-12-21

申请人： Avneesh Agrawal ,  Aamod Khandekar ,  Arak Sutivong ,  Alexei Gorokhov

发明人： Avneesh Agrawal ,  Aamod Khandekar ,  Arak Sutivong ,  Alexei Gorokhov

IPC分类号： H04J1/00

CPC分类号： H04L27/0008 ,  H04L27/2627 ,  H04L27/2649

摘要： A method for receiving an indication to apply a first modulation scheme to modulate one or more segments of a first portion includes determining a first segment set, having at least one segment of the first portion for applying the first modulation scheme. The method further includes modulating the first segment set of the first portion using the first modulation scheme. In addition, the method includes modulating one or more segments of the second portion using a second scheme, different from first modulation scheme.

摘要翻译： 接收用于应用第一调制方案来调制第一部分的一个或多个段的指示的方法包括确定具有用于施加第一调制方案的第一部分的至少一个段的第一段集合。 该方法还包括使用第一调制方案来调制第一部分的第一段集合。 此外，该方法包括使用不同于第一调制方案的第二方案来调制第二部分的一个或多个片段。

公开(公告)号：US08077654B2

公开(公告)日：2011-12-13

申请号：US11507787

申请日：2006-08-21

申请人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04W4/00 ,  H04B7/185

CPC分类号： H04W52/325 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0632

摘要： Systems and methodologies are described that facilitate providing auxiliary multiple-input, multiple-output (MIMO) pilot signals to MIMO user devices in a wireless communication environment. According to some aspects, a portion of data transmission power may be reallocated for auxiliary MIMO pilot transmission during a data segment in a time slot, in order to permit a MIMO user device to perform CQI and rank prediction. Additionally or alternatively, non-MIMO pilot transmission power may be reallocated in a pilot segment in the time slot for transmission of an auxiliary MIMO pilot signal to permit the MIMO user device to demodulate data transmitted in data segments of the time slot. MIMO pilot signals may additionally be time-division multiplexed within or across time slots and may be transmitted over available Walsh codes in data and control segments.

摘要翻译： 描述了有助于在无线通信环境中向MIMO用户设备提供辅助多输入多输出（MIMO）导频信号的系统和方法。 根据一些方面，可以在时隙中的数据段期间重新分配一部分数据发送功率用于辅助MIMO导频传输，以便允许MIMO用户设备执行CQI和秩预测。 附加地或替代地，可以在时隙中的导频段中重新分配非MIMO导频传输功率，以传输辅助MIMO导频信号，以允许MIMO用户设备解调在该时隙的数据段中发送的数据。 MIMO导频信号可以另外在时隙内或跨时隙进行时分复用，并且可以在数据和控制段中通过可用的沃尔什码传输。

公开(公告)号：US20100195630A1

公开(公告)日：2010-08-05

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： H04W72/04 ,  H04J3/00

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：US07724777B2

公开(公告)日：2010-05-25

申请号：US10887710

申请日：2004-07-08

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。