公开(公告)号：US20050249296A1

公开(公告)日：2005-11-10

申请号：US10837754

申请日：2004-05-04

申请人： Johan Axnas ,  Tomas Jonsson ,  Rajaram Ramesh ,  Jakob Singvall

发明人： Johan Axnas ,  Tomas Jonsson ,  Rajaram Ramesh ,  Jakob Singvall

IPC分类号： H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L27/28

CPC分类号： H04L1/1614 ,  H04L1/0026 ,  H04L1/0068 ,  H04L1/1671 ,  H04L1/1819

摘要： The invention is based on the recognition that optimal or at least improved performance can be obtained by providing relevant information that enables selection of which sub-block to set forth for transmission from the transmitting side to the receiving side. The idea according to the invention is to measure, for at least one data block, the reception quality of a number of received sub-blocks, and select which sub-block to set forth for transmission from the transmitting side based on the measured sub-block reception quality. For example, when all or several sub-blocks of a given data block have been received but the data block can still not be successfully decoded, it would normally be best to retransmit the sub-block that has the lowest quality. This generally increases the probability of successful decoding of the data block, thus increasing the throughput and reducing the delay.

摘要翻译： 本发明基于通过提供能够选择哪个子块用于从发送侧到接收侧进行发送的相关信息来获得最佳或至少改进的性能的认识。 根据本发明的想法是针对至少一个数据块来测量多个接收子块的接收质量，并且基于所测量的子块选择要从发送侧发送的哪个子块， 阻止接收质量。 例如，当已经接收到给定数据块的全部或几个子块，但数据块仍然不能被成功解码时，通常情况下最好重发具有最低质量的子块。 这通常增加了成功解码数据块的概率，从而增加了吞吐量并减少了延迟。

公开(公告)号：US06658050B1

公开(公告)日：2003-12-02

申请号：US09151713

申请日：1998-09-11

申请人： Rajaram Ramesh ,  Yi-Pin Eric Wang

发明人： Rajaram Ramesh ,  Yi-Pin Eric Wang

IPC分类号： H04B138

CPC分类号： H04W52/362 ,  H04L25/0234

摘要： A transceiver transmits signals with power control bits, the power control bits instructing the other transceiver to establish selected power levels for its return signal. In one form, a processor is adapted to determine channel coefficients for the pilot symbols as a function of both (1) the selected power levels of the other transceiver signal and (2) the difference between the predetermined pilot symbols and the pilot symbols as received by the receiver. The processor then interpolates channel coefficients for all symbols in the received signals based on the determined pilot symbol channel coefficients. In an alternate form, the processor uses a selected auto-correlation function which takes into account the selected power levels of the other transceiver signal to calculate an interpolation filter. In this alternate form, the processor then uses the calculated interpolation filter and channel coefficients for the pilot symbols to interpolate channel coefficients for symbols between the pilot symbols. A demodulator demodulates all received symbols based on the interpolated channel coefficients.

摘要翻译： 收发器用功率控制位发送信号，功率控制位指示另一个收发器为其返回信号建立选定的功率电平。 在一种形式中，处理器适于确定导频符号的信道系数作为（1）另一个收发器信号的所选功率电平的函数，以及（2）预定导频符号和接收到的导频符号之间的差异 由接收者。 然后，处理器基于所确定的导频符号信道系数内插所接收信号中的所有符号的信道系数。 在替代形式中，处理器使用所选择的自相关函数，其考虑了另一收发器信号的选定功率电平来计算内插滤波器。 在该替代形式中，处理器然后使用所计算的内插滤波器和导频符号的信道系数来内插导频符号之间的符号的信道系数。 解调器基于内插的信道系数来解调所有接收的符号。

公开(公告)号：US06567475B1

公开(公告)日：2003-05-20

申请号：US09222617

申请日：1998-12-29

申请人： Paul W. Dent ,  Rajaram Ramesh

发明人： Paul W. Dent ,  Rajaram Ramesh

IPC分类号： H04L100

CPC分类号： H04L27/186 ,  H04L27/0008

摘要： A method and system for the transmission, reception, and processing of 4-level and 8-level signaling symbols is provided. An inventive modulator is provided for modulating 4-level signaling symbols using an 8-level modulator. Further, this inventive modulator is able to produce 4-level modulation when modulating 4-level signaling symbols using an 8-level modulator, where the 4-level modulation represents the 4-level symbol sequence modulated. Further, a constrained/unconstrained demodulator is provided which is able to demodulate both 4-level signaling symbols and 8-level signaling symbols. The inventive demodulator accomplishes this by limiting the number of new symbol hypotheses and path histories to 4 when working with 4-level signaling symbols, and setting the number of new symbol hypotheses and path histories to 8 when working with 8-level signaling symbols. Additionally, an error correction decoder is provided which is also able to decode a demodulated signal which contains both 4-level and 8-level signaling symbols. The inventive error correction decoder accomplishes this by utilizing an interleaver that only places bits in the 2-bit positions of the 3-PSK soft values that correspond to the 2-bits of QPSK to decode 4-level signalling symbols, and utilizing an interleaver that places bits in all three of the possible bit positions of a symbol to decode 8-level signalling symbols.

摘要翻译： 提供了用于发送，接收和处理4级和8级信令符号的方法和系统。 提供了一种创造性调制器用于使用8电平调制器调制4电平信令符号。 此外，本发明的调制器能够在使用8电平调制器调制4电平信令符号时产生4电平调制，其中4电平调制表示4电平符号序列调制。 此外，提供了一种能够对4级信令符号和8级信令符号进行解调的约束/非约束解调器。 本发明的解调器通过在使用4级信令符号时将新的符号假设和路径历史的数量限制为4，并且在使用8级信令符号时将新的符号假设和路径历史的数量设置为8来实现。 此外，提供了一种纠错解码器，它还能够对包含4电平和8电平信号符号的解调信号进行解码。 本发明的纠错解码器通过利用仅将3-PSK软值的2位位置的位对应于QPSK的2位来解码4级信令符号的交织器来实现，并利用交织器 将位置在符号的所有三个可能位位置中，以解码8电平信令符号。

公开(公告)号：US06463105B1

公开(公告)日：2002-10-08

申请号：US09394998

申请日：1999-09-13

申请人： Rajaram Ramesh

发明人： Rajaram Ramesh

IPC分类号： H04L2302

CPC分类号： H04B7/005 ,  H04L1/20

摘要： Methods and systems are provided which calculate a carrier to interference ratio of a channel using an approach which accounts for variations in the channel response characteristics over the estimation evaluation time period. The time variations may be taken into account by various alternative approaches including breaking the sample period into a series of sub-sample estimation windows and applying a different constant channel response estimate to each sub-sample estimation window or by applying a time varying model to the channel when generating the channel response estimate (such as a least squares error fit to a first order or higher order equation). Accordingly, the systems and methods of the present invention may provide for improved estimates of the carrier to interference ratio, particularly for channels subject to multi-path fading effects such as those which may result from movement of a mobile terminal during measurements of the channel.

摘要翻译： 提供了使用考虑到在估计评估时间段内的信道响应特性的变化的方法来计算信道的载波干扰比的方法和系统。 可以通过各种替代方法考虑时间变化，包括将采样周期分解为一系列子样本估计窗口，并对每个子样本估计窗口应用不同的恒定信道响应估计，或者通过将时变模型应用于 通道（如与一阶或更高阶方程拟合的最小二乘方误差）。 因此，本发明的系统和方法可以提供对载波与干扰比的改进的估计，特别是对于经受多径衰落效应的信道，例如可能由信道测量期间的移动终端的移动而产生的信道。

公开(公告)号：US06389295B1

公开(公告)日：2002-05-14

申请号：US09625240

申请日：2000-07-25

申请人： Rajaram Ramesh

发明人： Rajaram Ramesh

IPC分类号： H04B700

CPC分类号： H04L25/0234 ,  H04B7/005

摘要： Information represented by a signal generated in a communications medium by a first entity is recovered by receiving the signal from the communications medium at a second entity, determining a mobility characteristic for communications between the first entity and the second entity, and adaptively estimating the information from the received signal based on the determined mobility characteristic. The mobility characteristic may be received from the first entity at the second entity, and the information represented by the received signal may be adaptively estimated based on the received mobility characteristic. According to an embodiment of the invention, the mobility characteristic is a cell type identifier which is communicated from a base station to a mobile terminal, the mobile terminal adaptively estimating information from a signal received from the base station based on the communicated cell type identifier. A number of signal processing functions may be adaptively performed, including adaptive demodulation, adaptive channel estimation/interpolation, adaptive equalization, adaptive channel tracking, and adaptive combining of received signals.

摘要翻译： 由第一实体在通信介质中生成的信号表示的信息通过在第二实体处接收来自通信介质的信号来确定，确定第一实体和第二实体之间的通信的移动性特征，并且自适应地估计来自 基于确定的移动性特性的接收信号。 可以从第二实体的第一实体接收移动性特征，并且可以基于接收到的移动性特性来自适应地估计由接收信号表示的信息。 根据本发明的实施例，移动性特征是从基站向移动终端传送的小区类型标识符，移动终端基于所传送的小区类型标识符，自适应地从基站接收的信号中估计信息。 可以自适应地执行多个信号处理功能，包括自适应解调，自适应信道估计/内插，自适应均衡，自适应信道跟踪和接收信号的自适应组合。

公开(公告)号：US06252918B1

公开(公告)日：2001-06-26

申请号：US09267378

申请日：1999-03-15

申请人： Gregory E. Bottomley ,  Karl Molnar ,  Rajaram Ramesh

发明人： Gregory E. Bottomley ,  Karl Molnar ,  Rajaram Ramesh

IPC分类号： H04B110

CPC分类号： H04B1/707 ,  H04B7/005 ,  H04L25/0202 ,  H04L25/03178 ,  H04L25/03299

摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.

摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。

公开(公告)号：US08861549B2

公开(公告)日：2014-10-14

申请号：US12170579

申请日：2008-07-10

申请人： Havish Koorapaty ,  Kumar Balachandran ,  Rajaram Ramesh

发明人： Havish Koorapaty ,  Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04J3/22 ,  H04L27/00 ,  H04L27/26 ,  H04L5/00 ,  H04J11/00

CPC分类号： H04L5/0007 ,  H04J11/0069 ,  H04L27/0008 ,  H04L27/2601

摘要： The technology provides a frame handler, a controller, and a frame structure design for a new radio communications system that provides backward compatibility with an existing or legacy radio communications system with lower signal bandwidth. Data to be transmitted to the new and legacy radio terminals is processed into a frame using a frame format that is compatible with both the new radio access technology system and the legacy radio access technology system so that both types of radio terminals may receive and extract data from the frame intended for each of those radio terminals. The format allows new and legacy radio terminal communications across the different bandwidths employed by the new and legacy systems.

摘要翻译： 该技术为具有较低信号带宽的现有或传统无线电通信系统提供向后兼容性的新无线电通信系统提供帧处理器，控制器和帧结构设计。 要发送到新的和传统的无线电终端的数据使用与新的无线电接入技术系统和传统无线电接入技术系统兼容的帧格式来处理成帧，使得两种类型的无线电终端可以接收和提取数据 从针对每个这些无线电终端的帧。 该格式允许新的和传统的无线电终端通过新的和遗留的系统所采用的不同带宽进行通信。

公开(公告)号：US08855086B2

公开(公告)日：2014-10-07

申请号：US13402344

申请日：2012-02-22

申请人： Rajaram Ramesh ,  Kumar Balachandran ,  Tomas Frankkila

发明人： Rajaram Ramesh ,  Kumar Balachandran ,  Tomas Frankkila

IPC分类号： H04J3/00 ,  H04L29/06

CPC分类号： H04L65/605 ,  H04L65/103 ,  H04L65/80

摘要： The present invention sends multiple versions of a multimedia packet to the base station, and, based on the radio channel and traffic characteristics, an appropriate version of the multimedia packet is selected to send to the mobile station at a given time. In this way, source transmission is improved to instantaneous conditions. The steps of the present invention are performed in conjunction with RTP used for multimedia transmission over internet protocol (IP) networks. In a first embodiment, the multiple versions are sent to the base station in the same RTP packet, and the base station strips out the extraneous versions. In a second embodiment, the base station receives multiple RTP packets having identical information in the packet header in many fields, and selects an appropriate one among these for transmission to the mobile station, discarding the rest.

摘要翻译： 本发明向基站发送多个版本的多媒体分组，并且基于无线电信道和业务特性，选择适当版本的多媒体分组以在给定时间向移动台发送。 以这种方式，源传输被改进到瞬时条件。 本发明的步骤与用于通过因特网协议（IP）网络的多媒体传输的RTP一起执行。 在第一实施例中，多个版本在相同的RTP分组中发送到基站，并且基站剥离外部版本。 在第二实施例中，基站在多个字段中在分组报头中接收到具有相同信息的多个RTP分组，并且选择其中适当的一个用于传输到移动台，丢弃其余的分组。

公开(公告)号：US08811352B2

公开(公告)日：2014-08-19

申请号：US11757777

申请日：2007-06-04

申请人： Rajaram Ramesh ,  Havish Koorapaty ,  Kumar Balachandran

发明人： Rajaram Ramesh ,  Havish Koorapaty ,  Kumar Balachandran

IPC分类号： H04W4/00

CPC分类号： H04B7/0671 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0048 ,  H04L25/0208 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224 ,  H04L27/2662

摘要： A method of channel estimation for a signal having a first portion transmitted using a transmit delay diversity scheme and a second portion transmitted using another multi-antenna transmission scheme includes determining a composite channel estimate from the transmit delay diversity portion of the signal. The method continues with segregating the composite channel estimate into delay groups corresponding to time offsets of the transmit delay diversity scheme for determination of first channel estimates for each subset of transmit antennas. Second channel estimates are determined for each subset of transmit antennas as a function of pilot symbols received in the second portion of the signal and corresponding ones of the first channel estimates. Thus, the first channel estimates are used to improve estimation of the second channel estimates. The method and variations of it may be implemented by configuring one or more processing circuits within a receiver circuit.

摘要翻译： 一种用于具有使用发射延迟分集方案发送的第一部分的信号的信道估计方法和使用另一多天线传输方案传输的第二部分的方法包括从所述信号的发射延迟分集部分确定复合信道估计。 该方法继续将复合信道估计分离成对应于发射延迟分集方案的时间偏移的延迟组，用于确定发射天线的每个子集的第一信道估计。 根据在信号的第二部分中接收到的导频符号和第一信道估计中的相应的导频符号，确定发射天线的每个子集的第二信道估计。 因此，第一信道估计用于改善第二信道估计的估计。 其方法和变化可以通过在接收器电路内配置一个或多个处理电路来实现。

公开(公告)号：US08779226B2

公开(公告)日：2014-07-15

申请号：US13606333

申请日：2012-09-07

申请人： Leslie Andrew Chewter ,  Rajaram Ramesh ,  Jeroen Van Westrenen

发明人： Leslie Andrew Chewter ,  Rajaram Ramesh ,  Jeroen Van Westrenen

IPC分类号： C07C2/00

CPC分类号： C07C1/22 ,  C07C1/20 ,  C07C29/04 ,  C07C2521/04 ,  C07C2521/06 ,  C07C2521/08 ,  C07C2521/12 ,  C07C2521/16 ,  C07C2529/40 ,  C07C2529/70 ,  C07C2529/83 ,  C07C2529/84 ,  C07C2529/85 ,  C07D301/03 ,  Y02P30/42 ,  C07C11/04 ,  C07C11/06

摘要： The present invention provides a process for preparing ethylene and/or propylene, comprising the steps of: a) providing an oxygenate-comprising feedstock; b) contacting the oxygenate-comprising feedstock with a molecular sieve-comprising catalyst at a temperature in the range of from 450 to 700° C. and converting at least part of the oxygenate into an olefinic product comprising ethylene and/or propylene; and c) retrieving the olefinic product, wherein the oxygenate-comprising feedstock comprises in the range of from 1 to 97 wt % of at least one tert-alkyl ether selected from the group MTBE, ETBE, TAME and TAEE, based on the weight of the oxygenates in the oxygenate-comprising feedstock, and further comprises methanol and/or DME.

摘要翻译： 本发明提供一种制备乙烯和/或丙烯的方法，包括以下步骤：a）提供含氧化合物的原料; b）使含氧化合物的原料与含分子筛的催化剂在450-700℃的温度下接触，并将至少部分含氧化合物转化为包含乙烯和/或丙烯的烯烃产物; 和c）回收所述烯烃产物，其中所述含氧化合物的原料包含1至97重量％的至少一种选自MTBE，ETBE，TAME和TAEE的叔烷基醚，基于 含氧化合物原料中的含氧化合物，还包含甲醇和/或DME。