公开(公告)号：US08811373B2

公开(公告)日：2014-08-19

申请号：US12191003

申请日：2008-08-13

申请人： Durga Malladi ,  Juan Montojo

发明人： Durga Malladi ,  Juan Montojo

IPC分类号： H04J3/06

CPC分类号： H04W48/12 ,  H04L1/0067 ,  H04L1/0071 ,  H04L1/0072 ,  H04L5/0007

摘要： Systems, methodologies, and devices are described that facilitate transmitting a guard time parameter to a mobile device to facilitate rate matching data around a guard time region associated with a downlink subframe of a radio frame sequence. A base station transmits the guard time parameter via PBCH or DBCH to the mobile device. The base station rate matches data associated with PDSCH, comprising DBCH, around the guard time region, and transmits PDSCH to the mobile device. The mobile device identifies the guard time parameter and rate matches at least a portion of the information received via the PDSCH around the guard time region to facilitate enhanced reception of PDSCH. Optionally, a radio frame sequence can be structured so that a subframe immediately following a subframe containing DBCH is a downlink subframe, which can be known by the mobile device a priori or based on a downlink subframe parameter.

摘要翻译： 描述了有助于向移动设备发送保护时间参数的系统，方法和设备，以促进与无线电帧序列的下行链路子帧相关联的保护时间区域周围的速率匹配数据。 基站通过PBCH或DBCH向移动设备发送保护时间参数。 基站速率在保护时间区域周围匹配与包括DBCH的PDSCH相关联的数据，并将PDSCH发送到移动设备。 移动设备识别保护时间参数和速率匹配在保护时间区域周围经由PDSCH接收的信息的至少一部分，以促进PDSCH的增强接收。 可选地，可以构造无线电帧序列，使得紧跟在包含DBCH的子帧之后的子帧是下行链路子帧，其可以由移动设备先验地或基于下行链路子帧参数而已知。

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：US20080090528A1

公开(公告)日：2008-04-17

申请号：US11773943

申请日：2007-07-05

申请人： Durga Malladi

发明人： Durga Malladi

IPC分类号： H04B1/00 ,  H04B7/00

CPC分类号： H04W72/042 ,  H04L1/0004 ,  H04L1/001 ,  H04L1/0026 ,  H04L1/0057 ,  H04L1/0073 ,  H04L1/1671 ,  H04L1/1887 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/0008 ,  H04L27/2613

摘要： Techniques for sending control information in a communication system are described. In an aspect, control information may be sent in a first frequency location (e.g., a first set of subcarriers) if data is not being sent and in a second frequency location (e.g., a second set of subcarriers) if data is being sent. In another aspect, control information may be processed in accordance with a first processing scheme if data is not being sent and with a second processing scheme if data is being sent. In one design of the first scheme, a CAZAC sequence may be modulated with each modulation symbol for control information to obtain a corresponding modulated CAZAC sequence, which may be sent on the first set of subcarriers. In one design of the second scheme, modulation symbols for control information may be combined with modulation symbols for data, transformed to frequency domain, and mapped to the second set of subcarriers.

摘要翻译： 描述用于在通信系统中发送控制信息的技术。 在一方面，如果数据未被发送，则控制信息可以在第一频率位置（例如，第一副载波集合）中发送，并且如果正在发送数据，则在第二频率位置（例如，第二子载波集合）中发送控制信息。 在另一方面，如果数据未被发送，并且如果正在发送数据，则可以根据第一处理方案来处理控制信息。 在第一方案的一种设计中，可以用每个调制符号调制CAZAC序列用于控制信息，以获得可以在第一组子载波上发送的对应的调制CAZAC序列。 在第二方案的一种设计中，用于控制信息的调制符号可以与用于数据的调制符号组合，变换到频域，并映射到第二组副载波。

公开(公告)号：US20080089312A1

公开(公告)日：2008-04-17

申请号：US11841771

申请日：2007-08-20

申请人： Durga Malladi

发明人： Durga Malladi

IPC分类号： H04J3/00

CPC分类号： H04L27/2613 ,  H04L5/0007 ,  H04L5/005 ,  H04L5/0064 ,  H04L5/0091 ,  H04L27/2655 ,  H04W16/02

摘要： In accordance an aspect, a method for a wireless communication system, determining a location in time of a sub-frame when SFN transmission for data will occur, determining a first transmission pattern and a second transmission pattern for reference signals, wherein the transmission patterns indicate the symbols and tones of a sub-frame to use for reference signals, selecting for use, between the first transmission pattern and second transmission pattern for reference signals depending on whether SFN data will be transmitted in the sub-frame, and broadcasting information about the selected transmission pattern prior to use thereof.

摘要翻译： 根据一个方面，一种用于无线通信系统的方法，当发生用于数据的SFN传输时确定子帧的时间位置，确定用于参考信号的第一传输模式和第二传输模式，其中传输模式指示 根据是否在子帧中发送SFN数据，使用用于参考信号的子帧的符号和音调，用于在第一传输模式和第二传输模式之间选择用于参考信号，并且广播关于 选择的传输模式。

公开(公告)号：US20070104253A1

公开(公告)日：2007-05-10

申请号：US11492605

申请日：2006-07-24

申请人： Tao Luo ,  Aleksandar Damnjanovic ,  Durga Malladi

发明人： Tao Luo ,  Aleksandar Damnjanovic ,  Durga Malladi

IPC分类号： H04B1/00

CPC分类号： H04L25/0202 ,  H04B1/71072 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0238

摘要： Techniques for deriving channel estimates with different channel estimation filters are described. In one scheme, a filter selection metric is determined for a signal to be recovered, a channel estimation filter is selected based on the filter selection metric, and a channel estimate is derived with the selected channel estimation filter. In another scheme, a first channel estimate is derived with a first channel estimation filter having a first filter response, a first signal is recovered with the first channel estimate, and interference due to the first signal is estimated and removed. A second channel estimate is derived with a second channel estimation filter having a second filter response that is different from the first filter response.

摘要翻译： 描述了使用不同信道估计滤波器导出信道估计的技术。 在一个方案中，为要恢复的信号确定滤波器选择度量，基于滤波器选择度量来选择信道估计滤波器，并且使用所选择的信道估计滤波器导出信道估计。 在另一方案中，利用具有第一滤波器响应的第一信道估计滤波器导出第一信道估计，用第一信道估计恢复第一信号，并且估计和去除由于第一信号引起的干扰。 使用具有与第一滤波器响应不同的第二滤波器响应的第二信道估计滤波器导出第二信道估计。

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：US20060227748A1

公开(公告)日：2006-10-12

申请号：US11351683

申请日：2006-02-10

申请人： Anastasios Stamoulis ,  Durga Malladi

发明人： Anastasios Stamoulis ,  Durga Malladi

IPC分类号： H04B7/212 ,  H04Q7/00

CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/025 ,  H04L25/0256 ,  H04L25/0258 ,  H04L27/261

摘要： Techniques for deriving a high quality channel estimate are described. A first channel impulse response estimate (CIRE) having multiple channel taps is derived, e.g., by filtering initial CIREs obtained from a received pilot. A threshold parameter value is selected based on at least one criterion, which may relate to channel profile, operating SNR, number of channel taps, and so on. A second CIRE is derived by zeroing out selected ones of the channel taps in the first CIRE based on the threshold parameter value. The average energy of the channel taps may be determined, a threshold may be derived based on the average energy and the threshold parameter value, and channel taps with energy less than the threshold may be zeroed out. A memory may store threshold parameter values for different operating scenarios, and a stored value may be selected for use based on the current operating scenario.

摘要翻译： 描述了用于导出高质量信道估计的技术。 具有多信道抽头的第一信道脉冲响应估计（CIRE）被导出，例如通过对从接收到的导频获得的初始CIRE进行滤波。 基于至少一个标准来选择阈值参数值，其可以涉及信道简档，操作SNR，信道抽头数等。 基于阈值参数值，通过对第一CIRE中的选通信道抽头进行归零而得到第二CIRE。 可以确定通道抽头的平均能量，可以基于平均能量和阈值参数值导出阈值，并且可以将能量小于阈值的通道抽头清零。 存储器可以存储不同操作场景的阈值参数值，并且可以基于当前操作场景选择使用存储的值。

公开(公告)号：US20060209902A1

公开(公告)日：2006-09-21

申请号：US11386122

申请日：2006-03-20

申请人： Francesco Grilli ,  Durga Malladi

发明人： Francesco Grilli ,  Durga Malladi

IPC分类号： H04J3/06

CPC分类号： H04L1/0061 ,  H04L1/0045 ,  H04L1/0065 ,  H04L2001/0093 ,  H04W4/06

摘要： An outer decoder and an inner decoder encode a block of information to be transmitted, to improve protection by adding redundancy. The redundancy permits decoding of the information from less than a complete encoded block of information. Time re-alignment of two transmissions of the same content from two base stations can mitigate the problem of duplicated frames. The user of the subscriber station can experience seamless service without repetition of content, even when handing over to a new cell while receiving a buffer of broadcast content.

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.

公开(公告)号：US20060078075A1

公开(公告)日：2006-04-13

申请号：US11248975

申请日：2005-10-11

申请人： Anastasios Stamoulis ,  Dung Doan ,  Durga Malladi

发明人： Anastasios Stamoulis ,  Dung Doan ,  Durga Malladi

IPC分类号： H03D1/04 ,  H04L27/06

CPC分类号： H04L25/03318 ,  H04L25/0226 ,  H04L25/03171 ,  H04L25/03292

摘要： Techniques for performing data detection and decoding in a manner to account for guard subbands are described. A receiver obtains received pilot symbols for pilot subbands and received data symbols for data subbands. Channel estimates are derived based on the received pilot symbols with zeroed-out pilot subbands filled with zeros. Data detection is performed on the received data symbols with the channel estimates to obtain data symbol estimates. Estimates of noise and estimation errors due to the zeroed-out pilot subbands are derived. LLRs are then computed based on the data symbol estimates, the channel estimates, and the estimates of the noise and estimation errors. The LLRs are deinterleaved and decoded to obtain decoded data.

摘要翻译： 描述了以考虑保护子带的方式执行数据检测和解码的技术。 接收机获得用于导频子带的接收导频符号和用于数据子带的接收数据符号。 基于接收到的导频符号导出信道估计，其中零导频子带填充零。 对具有信道估计的接收数据符号执行数据检测以获得数据符号估计。 导出由于零零导频子带导致的噪声和估计误差的估计。 然后基于数据符号估计，信道估计以及噪声和估计误差的估计来计算LLR。 LLR被解交织并解码以获得解码数据。