公开(公告)号：US20070242766A1

公开(公告)日：2007-10-18

申请号：US11688235

申请日：2007-03-19

申请人： Hao Xu ,  Byoung-Hoon Kim ,  Durga Malladi

发明人： Hao Xu ,  Byoung-Hoon Kim ,  Durga Malladi

IPC分类号： H04K1/10

CPC分类号： H04L1/0002 ,  H04L1/0025 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/023 ,  H04L25/0206 ,  H04L27/2608

摘要： Various methods and systems for determining reverse-link data rates in a multi-user communication system are disclosed. For example, an apparatus for controlling a data rate of at least a first UE in a multi-user communication system is disclosed. The apparatus may include a channel estimation device configured to determine channel estimates for a plurality of different reverse-link signals to produce a plurality of channel estimates, a demodulation device configured to determine a first signal-to-noise (SNR) ratio for the first UE using the plurality of different channels estimates, and a data rate determining device configured to determine a first reverse-link data rate for the first UE using the first SNR.

摘要翻译： 公开了用于在多用户通信系统中确定反向链路数据速率的各种方法和系统。 例如，公开了一种用于在多用户通信系统中控制至少第一UE的数据速率的装置。 该装置可以包括：信道估计装置，被配置为确定多个不同反向链路信号的信道估计以产生多个信道估计;解调装置，被配置为确定第一信道估计的第一信噪比 UE使用多个不同信道估计，以及数据速率确定装置，被配置为使用第一SNR确定第一UE的第一反向链路数据速率。

公开(公告)号：US20080032630A1

公开(公告)日：2008-02-07

申请号：US11687645

申请日：2007-03-17

申请人： Byoung-Hoon Kim ,  Durga Malladi ,  Hao Xu

发明人： Byoung-Hoon Kim ,  Durga Malladi ,  Hao Xu

IPC分类号： H04J3/00

CPC分类号： H04L5/0057 ,  H04B7/0413 ,  H04B7/0632 ,  H04B2201/70701 ,  H04L1/0002 ,  H04L1/02 ,  H04L1/06 ,  H04L5/023 ,  H04L25/0224 ,  H04L25/023 ,  H04L27/261 ,  H04W52/325 ,  H04W72/042

摘要： Techniques for efficiently deriving uplink channel estimates without consuming much additional uplink resources are described. A user equipment (UE) may send a request for uplink resources on a request channel (REQCH) whenever the UE desires to transmit data on the uplink. The UE may send the REQCH on a set of subcarriers and from multiple antennas, e.g., send REQCH data on data subcarriers and pilot on pilot subcarriers. A node B may receive the request, estimate the complex channel gains for the pilot subcarriers based on received pilot symbols, and coherently demodulate received data symbols based on the channel gain estimates. The Node B may estimate the complex channel gains for the data subcarriers based on demodulated data symbols and derive a channel estimate for each UE antenna based on the channel gain estimates for the pilot and data subcarriers. The Node B may use the channel estimates for MIMO scheduling, subband scheduling, and rate selection.

摘要翻译： 描述了在不消耗大量附加上行链路资源的情况下有效地导出上行链路信道估计的技术。 每当UE希望在上行链路上发送数据时，用户设备（UE）可以在请求信道（REQCH）上发送上行链路资源的请求。 UE可以在一组子载波上从多个天线发送REQCH，例如在数据子载波上发送REQCH数据，并在导频子载波上导频。 节点B可以接收该请求，基于接收到的导频符号估计导频子载波的复信道增益，并且基于信道增益估计来相干地解调所接收的数据符号。 节点B可以基于解调的数据符号来估计数据子载波的复信道增益，并且基于导频和数据子载波的信道增益估计导出每个UE天线的信道估计。 节点B可以使用用于MIMO调度，子带调度和速率选择的信道估计。

公开(公告)号：US20080095263A1

公开(公告)日：2008-04-24

申请号：US11770600

申请日：2007-06-28

申请人： Hao Xu ,  Byoung-hoon Kim ,  Durga Malladi

发明人： Hao Xu ,  Byoung-hoon Kim ,  Durga Malladi

IPC分类号： H04L27/00

CPC分类号： H04L1/0025 ,  H04B7/0689 ,  H04L1/0002 ,  H04L1/0021 ,  H04L27/2601 ,  H04L27/2614 ,  H04W52/245 ,  H04W52/367 ,  H04W52/42

摘要： Systems and methodologies are described that facilitate switching between various combinations of MIMO, SIMO, SISO and OFDM, LFDM and IFDM. According to various aspects, a method for a wireless communication network is provided that includes: receiving a first set of data information, wherein the first set of information comprising a first value, determining if the first value is above a threshold and transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold.

摘要翻译： 描述了促进MIMO，SIMO，SISO和OFDM，LFDM和IFDM的各种组合之间的切换的系统和方法。 根据各方面，提供了一种用于无线通信网络的方法，包括：接收第一组数据信息，其中所述第一组信息包括第一值，确定所述第一值是否高于阈值，并将指示发送到 如果确定第一值高于阈值，则切换到使用第一传输技术。

公开(公告)号：US20070270175A1

公开(公告)日：2007-11-22

申请号：US11689962

申请日：2007-03-22

申请人： Durga Malladi ,  Byoung-Hoon Kim ,  Xiaoxia Zhang

发明人： Durga Malladi ,  Byoung-Hoon Kim ,  Xiaoxia Zhang

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/343 ,  H04W52/367

摘要： A method for controlling power in a wireless network is provided. The method includes determining a relative power parameter at a wireless device such as a mobile wireless terminal and receiving a load parameter at the wireless device, where the load parameter is associated with at least one other wireless cell. The method includes adjusting transmit power of the wireless device in view of the relative power parameter and the load parameter. In another embodiment, the transmit power can be controlled in view of an absolute power spectral density parameter.

摘要翻译： 提供了一种用于控制无线网络中的功率的方法。 该方法包括确定诸如移动无线终端的无线设备处的相对功率参数，并且在无线设备处接收负载参数，其中负载参数与至少一个其它无线小区相关联。 该方法包括根据相对功率参数和负载参数调整无线设备的发射功率。 在另一实施例中，可以根据绝对功率谱密度参数来控制发射功率。

公开(公告)号：US20060227859A1

公开(公告)日：2006-10-12

申请号：US11392306

申请日：2006-03-28

申请人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Malladi

发明人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Malladi

IPC分类号： H03H7/30

CPC分类号： H04L25/03063 ,  H04L25/03057 ,  H04L25/03159

摘要： Techniques for performing decision feedback equalization are described. A feed-forward filter response and a feedback filter response are derived based on a channel estimate and a reliability parameter and further without constraint on the feedback filter response or with a constraint of no feedback for an on-time sample. The reliability parameter is indicative of the reliability of the feedback used for equalization and may be frequency dependent or frequency invariant. Different feed-forward and feedback filter responses may be derived with different constraints on the feedback filter and different assumptions for the reliability parameter. Equalization is performed with the feed-forward and feedback filter responses. If equalization is performed for multiple iterations then, for each iteration, the reliability parameter may be updated, the feed-forward and feedback filter responses may be derived based on the updated reliability parameter, and equalization may be performed with the filter responses for the iteration.

公开(公告)号：US20080089282A1

公开(公告)日：2008-04-17

申请号：US11842827

申请日：2007-08-21

申请人： Durga Malladi ,  Byoung-Hoon Kim ,  Juan Montojo

发明人： Durga Malladi ,  Byoung-Hoon Kim ,  Juan Montojo

IPC分类号： H04Q7/00 ,  H04L27/28

CPC分类号： H04L27/2655 ,  H04J11/0069 ,  H04L5/0007 ,  H04L5/0064 ,  H04L5/0091 ,  H04L27/2675

摘要： Systems and methods allow cell acquisition in a wireless communication system in frequency division multiple access mode of operation. Code sequences transmitted over primary synchronization channel (P-SCH) enable detection of symbol boundary, cyclic prefix duration, and indication of broadcast channel bandwidth. Sequences transmitted over secondary synchronization channel (S-SCH) afford radio frame boundary detection, cell identification, and broadcast channel bandwidth indication. Cell identification can be conveyed jointly between P-SCH and S-SCH codes. Broadcast channel sequences convey cyclic prefix timing, system bandwidth and other system information. Relay of cell acquisition information, as well as multiple-cell acquisition when wireless system operates with frequency reuse are described.

摘要翻译： 系统和方法允许在频分多址操作模式下的无线通信系统中的小区获取。 通过主同步信道（P-SCH）发送的码序列能够检测符号边界，循环前缀持续时间和广播信道带宽的指示。 通过次同步信道（S-SCH）发送的序列提供无线帧边界检测，小区识别和广播信道带宽指示。 小区识别可以在P-SCH和S-SCH码之间共同传送。 广播频道序列传送循环前缀时序，系统带宽和其他系统信息。 描述了无线系统在频率重用时工作的小区获取信息的中继，以及多小区采集。

公开(公告)号：US20070223423A1

公开(公告)日：2007-09-27

申请号：US11686951

申请日：2007-03-15

申请人： Byoung-Hoon Kim ,  Durga Malladi

发明人： Byoung-Hoon Kim ,  Durga Malladi

IPC分类号： H04Q7/00

CPC分类号： H04B7/0452 ,  H04B7/0417 ,  H04B7/0632 ,  H04B7/0665 ,  H04L1/0002 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/002 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/0035 ,  H04L1/06

摘要： Techniques for supporting MIMO transmission are described. User equipments (UEs) are classified into a first group of UEs to be scheduled individually and a second group of UEs that can be scheduled together. The classification may be based upon the number of transmit and receive antennas, sector loading, data requirements, long-term channel statistics, the number of UEs, etc. Channel quality indicator (CQI) information received from the UEs is interpreted in different manners depending on the groups to which the UEs belong. A single UE may be selected at a time from the first group or multiple UEs may be selected at a time from the second group for MIMO transmission. A MIMO transmission may be sent to a single UE in the first group or multiple UEs in the second group at rates selected based upon the CQI information.

摘要翻译： 描述了支持MIMO传输的技术。 用户设备（UE）被分类为要单独调度的第一组UE和可以一起调度的第二组UE。 分类可以基于发射和接收天线的数量，扇区负载，数据需求，长期信道统计，UE的数量等。从UE接收的信道质量指示符（CQI）信息以不同的方式被解释，这取决于 在UE所属的组上。 可以从第一组一次选择单个UE，或者可以从第二组一次选择多个UE进行MIMO传输。 可以基于CQI信息选择的速率将MIMO传输发送到第一组中的单个UE或第二组中的多个UE。

公开(公告)号：US20070223422A1

公开(公告)日：2007-09-27

申请号：US11686950

申请日：2007-03-15

申请人： Byoung-Hoon Kim ,  Durga Malladi

发明人： Byoung-Hoon Kim ,  Durga Malladi

IPC分类号： H04Q7/00

CPC分类号： H04B7/0452 ,  H04B7/0417 ,  H04B7/0632 ,  H04B7/0634 ,  H04L1/06 ,  H04L1/1812 ,  H04L1/1854 ,  H04L1/1887 ,  H04L27/2608

摘要： Techniques for supporting MIMO transmission are described. Users are classified into a first group of users to be scheduled individually for MIMO transmission and a second group of users that can be scheduled together for MIMO transmission. Transmission resources are allocated to the first and second groups, e.g., based upon various criteria such as the number of users in each group, data requirements of the users, total loading for each group, etc. The transmission resources may be hybrid automatic retransmission (HARQ) interlaces, frequency channels, time frequency resources, etc. The resource allocation may be semi-static. The transmission resources allocated to each group are used for data transmission on the downlink and/or uplink for the users in the group. HARQ with blanking may be used for data transmission for the users in the first group. HARQ without blanking may be used for data transmission for the users in the second group.

摘要翻译： 描述了支持MIMO传输的技术。 用户被分类为要单独调度用于MIMO传输的第一组用户和可以一起调度用于MIMO传输的第二组用户。 传输资源分配给第一组和第二组，例如基于各组用户数，各用户的数据需求，每个组的总负载等各种标准。传输资源可以是混合自动重传（ HARQ）交织，频率信道，时间频率资源等。资源分配可以是半静态的。 分配给每个组的传输资源用于组中用户的下行链路和/或上行链路上的数据传输。 具有消隐的HARQ可以用于第一组中的用户的数据传输。 不消消息的HARQ可以用于第二组中的用户的数据传输。

公开(公告)号：US20060255989A1

公开(公告)日：2006-11-16

申请号：US11408477

申请日：2006-04-21

申请人： Byoung-Hoon Kim ,  Durga Malladi ,  Sandip Sarkar

发明人： Byoung-Hoon Kim ,  Durga Malladi ,  Sandip Sarkar

IPC分类号： H03M1/10

CPC分类号： H04L1/0036 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/16 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0023 ,  H04L5/0028 ,  H04L5/0037 ,  H04L5/006

摘要： Techniques for selecting transmit formats in a manner to account for the degrees of resource reuse for multiple data streams sent simultaneously from multiple antennas are described. The degree of resource reuse for each data stream indicates the amount of reuse of resources (e.g., orthogonal codes or subcarriers) observed by that stream. Interference estimates for the multiple data streams are derived based on an initial resource assignment. The degrees of resource reuse are determined based on the interference estimates and are used to derive at least one correction factor. At least one transmit format is then selected for the data streams using the at least one correction factor. Each data stream is associated with a transmit format that indicates the amount of resources to use for the data stream and other parameters. Resources are assigned to each data stream in accordance with its transmit format.

公开(公告)号：US20060176987A1

公开(公告)日：2006-08-10

申请号：US11293527

申请日：2005-12-02

申请人： Durga Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

发明人： Durga Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

IPC分类号： H03D1/04

CPC分类号： H04L25/03006 ,  H04L25/022 ,  H04L25/0228 ,  H04L2025/03375 ,  H04L2025/03783

摘要： One embodiment includes a method of receiving a transmitted signal. The method comprises receiving a signal transmitted over a channel. The signal comprises a known signal and an information signal. The method further includes determining at least one indicator of channel characteristics based at least in part on the portion of the known signal. The method further includes generating a first value indicative of the information signal based at least in part on the at least one indicator of the channel characteristics. The first value comprises an error signal. The method further comprises removing the error signal from the first estimate of the signal based at least in part on the portion of the known signal. Other embodiments include systems for performing the method and methods of making such systems.