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1. 发明申请

US20060183287A1 Methods and apparatus for transmitting layered and non-layered data via layered modulation 有权
公开(公告)号：US20060183287A1
公开(公告)日：2006-08-17
申请号：US11330796
申请日：2006-01-11
申请人： Bruce Collins , Rajeev Krishnamurthi , Murali Chari , Shusheel Gautam , Rajiv Vijayan , Seong Chung
发明人： Bruce Collins , Rajeev Krishnamurthi , Murali Chari , Shusheel Gautam , Rajiv Vijayan , Seong Chung
IPC分类号： H01L21/8236
CPC分类号： H04L1/0065 , H04L1/0041 , H04L1/0045 , H04L1/0058 , H04L5/023 , H04L27/3488 , H04L2001/0098
摘要： A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.

2. 发明申请

US20060198454A1 Adaptive channel estimation thresholds in a layered modulation system 审中-公开
标题翻译：分层调制系统中的自适应信道估计阈值
公开(公告)号：US20060198454A1
公开(公告)日：2006-09-07
申请号：US11329717
申请日：2006-01-10
申请人： Seong Chung , Rajiv Vijayan
发明人： Seong Chung , Rajiv Vijayan
IPC分类号： H04K1/10
CPC分类号： H04L27/2601 , H04L25/0202 , H04L25/022 , H04L27/3488
摘要： Dynamic channel estimation thresholds allow for determining optimal threshold values for channel estimation in a layered-modulation wireless communication system. A channel estimation threshold can be used to remove or otherwise filter out channel estimate components that may be significantly influenced by noise. The channel estimation threshold value can be used to generate a refined channel estimate that is used in decoding multiple layers of a layered modulation signal. The channel estimation threshold value can be varied based on the performance of the various signal layer decoders. The adaptive channel estimation threshold provides for decoding a base layer based on an optimal threshold value for the base layer; determining an error rate associated with decoding the base layer; and using an optimal threshold value for an enhancement layer in a channel estimation algorithm if the error rate is lower than a predetermined level.
摘要翻译：动态信道估计阈值允许确定分层调制无线通信系统中的信道估计的最佳阈值。可以使用信道估计阈值来去除或以其他方式滤除可能受噪声显着影响的信道估计分量。信道估计阈值可以用于生成用于解码分层调制信号的多个层的精细信道估计。可以基于各种信号层解码器的性能来改变信道估计阈值。自适应信道估计阈值基于用于基本层的最佳阈值来解码基本层; 确定与所述基本层解码相关联的错误率; 以及如果误差率低于预定水平，则在信道估计算法中对增强层使用最佳阈值。

3. 发明申请

US20060171283A1 Method and apparatus for decoding data in a layered modulation system 有权
标题翻译：用于在分层调制系统中解码数据的方法和装置
公开(公告)号：US20060171283A1
公开(公告)日：2006-08-03
申请号：US11329891
申请日：2006-01-10
申请人： Rajiv Vijayan , Seong Chung , Thomas Sun
发明人： Rajiv Vijayan , Seong Chung , Thomas Sun
IPC分类号： H01L21/66 , G11B3/74 , G01R31/26
CPC分类号： H04L27/3488 , H04L1/0045 , H04L1/005 , H04L1/0065 , H04L1/0066 , H04L1/007 , H04L27/2608 , H04L27/2626 , H04L27/2647 , H04L27/2649 , H04L2001/0098
摘要： A decoder for a layered modulation system can be configured to independently and concurrently decode each of a base and enhancement layer. The base layer decoder and enhancement layer decoder can be configured substantially in parallel and can each operate concurrently on the same received layered modulation symbol. Each of the base and enhancement layer decoders can be configured with a bit metric module that is configured to determine a signal quality metric based on the received symbol. In systems having turbo encoded data, the bit metric module can be configured to determine a log likelihood ratio. The ratio is based in part on a channel estimate and an energy ratio used in the layered modulation constellation.
摘要翻译：用于分层调制系统的解码器可以被配置为独立地并且解码每个基本和增强层。基本层解码器和增强层解码器可以基本并行配置，并且可以在相同的接收分层调制符号上同时操作。基本和增强层解码器中的每一个可以配置有位度量模块，其被配置为基于接收到的符号来确定信号质量度量。在具有turbo编码数据的系统中，比特量度模块可被配置为确定对数似然比。该比率部分地基于在分层调制星座中使用的信道估计和能量比。

4. 发明授权

US09042461B2 Efficient employment of digital upsampling using IFFT in OFDM systems for simpler analog filtering 有权
标题翻译：在OFDM系统中有效利用使用IFFT的数字上采样进行更简单的模拟滤波
公开(公告)号：US09042461B2
公开(公告)日：2015-05-26
申请号：US11373001
申请日：2006-03-09
申请人： Raghuraman Krishnamoorthi , Fuyun Ling , Rajiv Vijayan
发明人： Raghuraman Krishnamoorthi , Fuyun Ling , Rajiv Vijayan
IPC分类号： H04N7/18 , H04L27/26
CPC分类号： H04L27/2644
摘要： Systems and methods are provided for transmitting OFDM information via IFFT up-sampling components that transmit data at a higher sampling rate than conventional systems to simplify filter requirements and mitigate leakage between symbols. In one embodiment, an NL point IFFT is performed on a zero inserted set of frequency domain symbols. In another embodiment, the NL point IFFT is further optimized by exploiting the fact that (N−1) L of the frequency domain symbols are zero. This enables an embodiment that consists of a pre-processor that multiplies the input samples by complex phase factors, followed by L point IFFTs.
摘要翻译：提供了系统和方法，用于通过IFFT上采样组件传输OFDM信息，该组件以比常规系统更高的采样速率传输数据，以简化滤波器要求并减轻符号之间的泄漏。在一个实施例中，对零插入的频域符号组执行NL点IFFT。在另一个实施例中，通过利用频域符号的（N-1）L为零的事实进一步优化NL点IFFT。这使得能够由预处理器组成的实施例，该预处理器将输入样本乘以复相位因子，随后是L点IFFT。

5. 发明授权

US08842619B2 Scalable frequency band operation in wireless communication systems 有权
标题翻译：无线通信系统中的可扩展频带操作
公开(公告)号：US08842619B2
公开(公告)日：2014-09-23
申请号：US13178357
申请日：2011-07-07
申请人： Aamod Dinkar Khandekar , Alexei Yurievitch Gorokhov , Avneesh Agrawal , Rajiv Vijayan , Edward Harrison Teague , Fatih Ulupinar
发明人： Aamod Dinkar Khandekar , Alexei Yurievitch Gorokhov , Avneesh Agrawal , Rajiv Vijayan , Edward Harrison Teague , Fatih Ulupinar
IPC分类号： H04Q7/00 , H04L27/26 , H04L5/02 , H04W48/12
CPC分类号： H04L5/023 , H04L27/2602 , H04W48/12
摘要： To support mobile stations that are not capable of demodulating the entire bandwidth or that can be made to demodulate less than the entire bandwidth, a system, apparatus and method are provided to schedule users on less than all of the bandwidth. Further, certain users can be scheduled on more of the bandwidth than others.
摘要翻译：为了支持不能解调整个带宽或者可以使其解调的小于整个带宽的移动站，提供了一种系统，装置和方法，以在小于全部带宽上调度用户。此外，某些用户可以比其他用户更多地调度带宽。

6. 发明授权

US08826093B2 Power saving method for coded transmission 有权
标题翻译：编码传输省电方式
公开(公告)号：US08826093B2
公开(公告)日：2014-09-02
申请号：US11335013
申请日：2006-01-18
申请人： Gordon Kent Walker , Chinnappa K. Ganapathy , Dhinakar Radhakrishnan , Fuyun Ling , Rajiv Vijayan
发明人： Gordon Kent Walker , Chinnappa K. Ganapathy , Dhinakar Radhakrishnan , Fuyun Ling , Rajiv Vijayan
IPC分类号： H04L1/18 , H04L1/00
CPC分类号： H04L1/0053 , H04L1/0045 , H04L1/0057 , H04L1/0065 , H04L1/0071 , H04L1/0083
摘要： Conserving power for coded transmissions comprises ceasing to process parity packets once associated data packets are deemed correct or corrected. Once data packets are deemed correct or corrected, the receiving unit can shut off during the transmission of parity packets.
摘要翻译：编码传输的节省功率包括：一旦相关联的数据分组被认为是正确的或纠正的，停止处理奇偶分组。一旦数据分组被认为是正确的或纠正的，接收单元可以在传输奇偶分组期间关闭。

7. 发明授权

US08724555B2 Uplink pilot and signaling transmission in wireless communication systems 有权
标题翻译：无线通信系统中的上行链路导频和信令传输
公开(公告)号：US08724555B2
公开(公告)日：2014-05-13
申请号：US11418930
申请日：2006-05-04
申请人： Ranganathan Krishnan , Rajiv Vijayan , Tamer Kadous
发明人： Ranganathan Krishnan , Rajiv Vijayan , Tamer Kadous
IPC分类号： H04W4/00 , H04J11/00 , H04W74/00 , H04W72/04
CPC分类号： H04W74/004 , H04L5/0023 , H04L5/0041 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L25/0248 , H04W52/325 , H04W72/0413
摘要： Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.
摘要翻译：在OFDM系统中在上行链路上更有效地发送导频和信令的技术。通过子带复用，系统中的M个可用子带被划分成Q个不相关的子带组。每个子带组可被分配给用于上行链路导频传输的不同终端。多个终端可以在其分配的子带上同时发送。即使S代替M个子带用于每个终端的导频传输，导频的发射功率也可以按比例更高以获得相同的总导频能量。接收来自终端的导频传输，并且基于在所分配的子带上接收到的导频，为每个终端导出信道估计。信道估计包括对未分配组中的附加子带的响应。子带复用也可以用于上行链路信令传输。

8. 发明授权

US08005420B2 Method and apparatus for seamlessly switching reception between mutlimedia streams in a wireless communication system 有权
标题翻译：用于在无线通信系统中无缝切换多媒体流之间的接收的方法和装置
公开(公告)号：US08005420B2
公开(公告)日：2011-08-23
申请号：US11752291
申请日：2007-05-22
申请人： Ramaswamy Murali , Gordon Kent Walker , Rajiv Vijayan
发明人： Ramaswamy Murali , Gordon Kent Walker , Rajiv Vijayan
IPC分类号： H04H40/00
CPC分类号： H04N5/4401 , H04N5/50 , H04N21/41407 , H04N21/4345 , H04N21/4384 , H04N21/44222
摘要： Techniques to seamlessly switch reception between multimedia programs are described. For “continued decoding”, a wireless device continues to receive, decode, decompress, and (optionally) display a current program, even after a new program has been selected, until overhead information needed to decode the new program is received. After receiving the overhead information, the wireless device decodes the new program but continues to decompress the current program. The wireless device decompresses the new program after decoding this program. For “early decoding”, the wireless device receives a user input and identifies a program with potential for user selection. The identified program may be the one highlighted by the user input or a program anticipated to be selected based on the user input. The wireless device initiates decoding of the identified program, prior to its selection, so that the program can be decompressed and displayed earlier if it is subsequently selected.
摘要翻译：描述了在多媒体节目之间无缝切换接收的技术。对于“继续解码”，即使在选择了新的程序之后，无线设备继续接收，解码，解压缩和（可选地）显示当前程序，直到接收到解码新程序所需的开销信息。在接收到开销信息之后，无线设备解码新程序，但是继续解压缩当前程序。解码该程序后，无线设备解压缩新程序。对于“早期解码”，无线设备接收用户输入并识别具有用户选择潜力的节目。识别的程序可以是由用户输入或预期将基于用户输入选择的程序突出显示的程序。无线设备在其选择之前启动所识别的节目的解码，使得如果随后选择该节目，则可以更早地解压缩并显示节目。

9. 发明授权

US07881245B2 Local and wide-area transmissions in a wireless broadcast network 有权
标题翻译：无线广播网络中的本地和广域传输
公开(公告)号：US07881245B2
公开(公告)日：2011-02-01
申请号：US12506055
申请日：2009-07-20
申请人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaaswamy Murali , Ashok Mantravadi , Anand Subramaniam , Krishnamurthy Viswanathan, legal representative
发明人： Rajiv Vijayan , Fuyun Ling , Gordon Kent Walker , Ramaaswamy Murali , Ashok Mantravadi , Anand Subramaniam
IPC分类号： H04H20/71
CPC分类号： H04L5/0041 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L12/189 , H04W72/005
摘要： To broadcast different types of transmission having different tiers of coverage in a wireless broadcast network, each base station processes data for a wide-area transmission in accordance with a first mode (or coding and modulation scheme) to generate data symbols for the wide-area transmission and processes data for a local transmission in accordance with a second mode to generate data symbols for the local transmission. The first and second modes are selected based on the desired coverage for wide-area and local transmissions, respectively. The base station also generates pilots and overhead information for local and wide-area transmissions. The data, pilots, and overhead information for local and wide-area transmissions are multiplexed onto their transmission spans, which may be different sets of frequency subbands, different time segments, or different groups of subbands in different time segments. More than two different types of transmission may also be multiplexed and broadcast.
摘要翻译：为了在无线广播网络中广播具有不同层次的不同类型的传输，每个基站根据第一模式（或编码和调制方案）处理广域传输的数据，以产生广域的数据符号根据第二模式传输和处理用于本地传输的数据，以产生用于本地传输的数据符号。分别基于广域和本地传输的期望覆盖来选择第一和第二模式。基站还为本地和广域传输生成导频和开销信息。用于本地和广域传输的数据，导频和开销信息被复用到它们的传输跨度，其可以是不同组的频率子带，不同时间段或不同时间段中的不同子带组。多于两种不同类型的传输也可以被复用和广播。

10. 发明申请

US20100265865A9 MULTIPLEXING AND TRANSMISSION OF MULTIPLE DATA STREAMS IN A WIRELESS MULTI-CARRIER COMMUNICATION SYSTEM 有权
标题翻译：无线多载波通信系统中多路数据流的多路复用与传输
公开(公告)号：US20100265865A9
公开(公告)日：2010-10-21
申请号：US11751631
申请日：2007-05-21
申请人： Rajiv Vijayan , Aamod Khandekar , Fuyun Ling , Gordon Kent Walker , Ramaswamy Murali
发明人： Rajiv Vijayan , Aamod Khandekar , Fuyun Ling , Gordon Kent Walker , Ramaswamy Murali
IPC分类号： H04J3/24
CPC分类号： H04W52/0209 , H04B7/12 , H04L1/0057 , H04L1/0065 , H04L1/0071 , H04L1/0083 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L5/0053 , H04L5/06 , H04L25/0224 , H04L27/2602 , H04N21/2383 , H04N21/4382 , H04N21/6112 , H04W4/06 , H04W28/06 , H04W72/04 , Y02D70/166 , Y02D70/168 , Y02D70/442
摘要： Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.
摘要翻译：描述用于复用和传输多个数据流的技术。多个数据流的传输发生在“超帧”中。每个超帧具有预定的持续时间并进一步分为多个（例如，四个）帧。每个数据流的每个数据块被外部编码以生成相应的代码块。每个码块被划分成多个子块，并且每个码块中的每个数据分组被内部编码和调制以产生分组的调制符号。每个码块的多个子块在相同超帧的多个帧中传送，每帧一个子块。每个数据流在每个超帧中被分配多个传输单元，并被分配特定的传输单元以实现有效的打包。无线设备可以选择和接收各个数据流。

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