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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。
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公开(公告)号：US07990911B2
公开(公告)日：2011-08-02
申请号：US11317868
申请日：2005-12-22
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。
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33.发明授权公开(公告)号：US07962141B2
公开(公告)日：2011-06-14
申请号：US11856648
申请日：2007-09-17
CPC分类号： H04W36/06
摘要： The disclosed embodiments provide for methods and systems for selecting sectors for handoff in a communication system. According to one aspect, the method includes monitoring an indicia of transmit power on a plurality of RL control channels directed to a plurality of sectors, and selecting one of the sectors as a candidate for a RL handoff. The disclosed embodiments also provide for methods and systems for indicating a selected serving sector for handoff in a communication system. According to one aspect, the method includes sending a first signal to a first sector to indicate the first sector as a serving sector for a forward-link handoff, and sending a second signal to a second sector to indicate the second sector as a serving sector for a reverse-link handoff.
摘要翻译： 所公开的实施例提供了用于在通信系统中选择用于切换的扇区的方法和系统。 根据一个方面，所述方法包括：监视指向多个扇区的多个RL控制信道上的发射功率的标记，以及选择所述扇区之一作为RL切换的候选。 所公开的实施例还提供了用于在通信系统中指示用于切换的所选择的服务扇区的方法和系统。 根据一个方面，所述方法包括向第一扇区发送第一信号以将第一扇区指示为用于前向链路切换的服务扇区，以及向第二扇区发送第二信号以将第二扇区指示为服务扇区 用于反向链路切换。
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公开(公告)号：US07706324B2
公开(公告)日：2010-04-27
申请号：US11129636
申请日：2005-05-13
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。
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35.发明授权Systems and methods that utilize a capacity-based signal-to-noise ratio to predict and improve mobile communication 失效利用基于容量的信噪比来预测和改进移动通信的系统和方法公开(公告)号：US07623490B2
公开(公告)日：2009-11-24
申请号：US11021697
申请日：2004-12-22
IPC分类号： H04W4/00
CPC分类号： H04W52/241 , H04L1/0001 , H04L1/0002 , H04L1/0009 , H04L1/0026 , H04L1/0028 , H04L1/0066 , H04L1/20 , H04L1/206 , H04W52/24
摘要： Techniques for utilizing a capacity-based effective signal-to-noise ratio (SNR) to improve wireless communication are described herein. In an embodiment, a mobile terminal can determine the effective SNR from a forward link channel using pilot/data symbols. The mobile terminal can convey the effective SNR to a base station. In order to minimize transmission overhead, the mobile terminal can quantize the effective SNR prior to transmitting it to the base station. In another embodiment, the base station can determine the effective SNR from a reverse link. The base station can utilize the effective SNR to facilitate scheduling transmissions from the mobile terminal, transmitting power control commands to the mobile terminal, and determining a supporting data rate for the mobile terminal, for example. Suitable SNRs include constrained, unconstrained, average, and/or approximated effective SNRs. In addition, various filters, such as an averaging filter, can be utilized to further process the effective SNR.
摘要翻译： 这里描述了利用基于容量的有效信噪比（SNR）来改善无线通信的技术。 在一个实施例中，移动终端可以使用导频/数据符号从前向链路信道确定有效SNR。 移动终端可以将有效SNR传送给基站。 为了最小化传输开销，移动终端可以在将其发送到基站之前量化有效SNR。 在另一个实施例中，基站可以从反向链路确定有效SNR。 基站可以利用有效SNR来促进调度来自移动终端的传输，向移动终端发送功率控制命令，以及确定移动终端的支持数据速率。 合适的SNR包括约束的，无约束的，平均的和/或近似的有效SNR。 此外，可以使用诸如平均滤波器的各种滤波器来进一步处理有效SNR。
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36.发明申请公开(公告)号：US20080009292A1
公开(公告)日：2008-01-10
申请号：US11856648
申请日：2007-09-17
申请人： David Julian , Avneesh Agrawal , Arak Sutivong , Edward Teague
发明人： David Julian , Avneesh Agrawal , Arak Sutivong , Edward Teague
IPC分类号： H04Q7/20
CPC分类号： H04W36/06
摘要： The disclosed embodiments provide for methods and systems for selecting sectors for handoff in a communication system. According to one aspect, the method includes monitoring an indicia of transmit power on a plurality of RL control channels directed to a plurality of sectors, and selecting one of the sectors as a candidate for a RL handoff. The disclosed embodiments also provide for methods and systems for indicating a selected serving sector for handoff in a communication system. According to one aspect, the method includes sending a first signal to a first sector to indicate the first sector as a serving sector for a forward-link handoff, and sending a second signal to a second sector to indicate the second sector as a serving sector for a reverse-link handoff.
摘要翻译： 所公开的实施例提供了用于在通信系统中选择用于切换的扇区的方法和系统。 根据一个方面，所述方法包括：监视指向多个扇区的多个RL控制信道上的发射功率的标记，以及选择所述扇区之一作为RL切换的候选。 所公开的实施例还提供了用于在通信系统中指示用于切换的所选择的服务扇区的方法和系统。 根据一个方面，所述方法包括向第一扇区发送第一信号以将第一扇区指示为用于前向链路切换的服务扇区，以及向第二扇区发送第二信号以将第二扇区指示为服务扇区 用于反向链路切换。
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公开(公告)号：US20060002346A1
公开(公告)日：2006-01-05
申请号：US11022348
申请日：2004-12-22
申请人： Arak Sutivong , Avneesh Agrawal
发明人： Arak Sutivong , Avneesh Agrawal
IPC分类号： H04Q7/00
CPC分类号： H04W52/367 , H04W52/12 , H04W52/146 , H04W52/20 , H04W52/24 , H04W52/286 , H04W52/48
摘要： A closed-loop reverse-link power control algorithm for a frequency hopping orthogonal frequency division multiple access (FH-OFDMA) system is described. The power control algorithm adjusts the user's transmit power based on effective carrier-to-interference (C/I) and Received-Power-Over-Thermal (RpOT) measurements. The algorithm is inherently stable and is effective for FH-OFDMA systems with retransmissions.
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38.发明授权公开(公告)号：US08516314B2
公开(公告)日：2013-08-20
申请号：US13206206
申请日：2011-08-09
IPC分类号： G06F11/00
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。
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39.发明授权Power control for a wireless communication system utilizing orthogonal multiplexing 有权利用正交复用的无线通信系统的功率控制公开(公告)号：US08452316B2
公开(公告)日：2013-05-28
申请号：US10897463
申请日：2004-07-22
IPC分类号： H04M1/00
CPC分类号： H04W52/247 , H04B17/309 , H04L1/0045 , H04L1/0057 , H04L1/20 , H04W24/00 , H04W52/125 , H04W52/146 , H04W52/16 , H04W52/20 , H04W52/24 , H04W52/241 , H04W52/242 , H04W52/243 , H04W52/283 , H04W52/36 , H04W52/362 , H04W52/367 , H04W52/54 , H04W52/60 , H04W88/08
摘要： Techniques for adjusting transmit power to mitigate both intra-sector interference to a serving base station and inter-sector interference to neighbor base stations are described. The amount of inter-sector interference that a terminal may cause may be roughly estimated based on the total interference observed by each neighbor base station, channel gains for the serving and neighbor base stations, and the current transmit power level. The transmit power may be decreased if high interference is observed by a neighbor base station and increased otherwise. The transmit power may be adjusted by a larger amount and/or more frequently if the terminal is located closer to the neighbor base station observing high interference and/or if the current transmit power level is higher, and vice versa. The intra-sector interference is maintained within an acceptable level by limiting a received SNR for the terminal to be within a range of allowable SNRs.
摘要翻译： 描述了用于调整发射功率以减轻对服务基站的扇区内干扰和对邻近基站的扇区间干扰的技术。 终端可能引起的扇区间干扰的量可以基于每个相邻基站观测到的总干扰，服务和相邻基站的信道增益以及当前发射功率电平来大致估计。 如果邻近基站观测到高干扰，否则发射功率可能会降低。 如果终端位于更靠近观测到高干扰的邻近基站和/或当前发射功率电平较高时，发射功率可以更大量地和/或更频繁地进行调整，反之亦然。 通过将终端的接收的SNR限制在可允许的SNR的范围内，将扇区内的干扰维持在可接受的水平内。
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公开(公告)号：US08259669B2
公开(公告)日：2012-09-04
申请号：US12721906
申请日：2010-03-11
IPC分类号： H04W4/00
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。
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