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81. 发明申请

US20050249296A1 Incremental redundancy operation in a wireless communication network 审中-公开
标题翻译：无线通信网络中的增量冗余操作
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。

82. 发明授权

US06658050B1 Channel estimates in a CDMA system using power control bits 有权
标题翻译：使用功率控制位的CDMA系统中的信道估计
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。

83. 发明授权

US06621858B2 Flexible sliding correlator for direct sequence spread spectrum systems 有权
公开(公告)号：US06621858B2
公开(公告)日：2003-09-16
申请号：US09729524
申请日：2000-12-04
申请人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
发明人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
IPC分类号： H04B169
CPC分类号： H04B1/7075 , H04B1/70752 , H04B1/70758 , H04B1/7093 , H04B1/7095 , H04B1/7115 , H04B2201/70711
摘要： A flexible sliding correlator for use in a spread spectrum receiver divides baseband signal samples into different groups, associates each group with a different section of a spreading code, and combines ones of the signal samples with corresponding values in the spreading code section. The groupings and spreading code sections can be changed during operation of the receiver to maximize performance of the receiver under different or changing conditions. In addition, the sample and spreading code value combinations can be further combined in different ways, and the further combinations can be changed during operation of the receiver. According to another aspect of the invention, the baseband signal can be sampled either uniformly or non-uniformly. The phase and frequency of the baseband sampling can be adjusted during operation of the receiver so that samples are taken very close to the optimum sampling position, at the peak of a chip waveform in the baseband signal.

84. 发明授权

US06567475B1 Method and system for the transmission, reception and processing of 4-level and 8-level signaling symbols 有权
标题翻译：用于传输，接收和处理4级和8级信令符号的方法和系统
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。

85. 发明授权

US06463105B1 Methods and systems for estimation of the carrier to interference ratio for a wireless communication channel 失效
标题翻译：用于估计无线通信信道的载波干扰比的方法和系统
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。

86. 发明授权

US06389295B1 Communications apparatus and methods for adaptive signal processing based on mobility characteristics 有权
标题翻译：基于移动特性的自适应信号处理通信装置和方法
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。

87. 发明授权

US06363105B1 Flexible sliding correlator for direct sequence spread spectrum systems 失效
标题翻译：用于直接序列扩频系统的灵活滑动相关器
公开(公告)号：US06363105B1
公开(公告)日：2002-03-26
申请号：US09024120
申请日：1998-02-17
申请人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
发明人： Essam Sourour , Greg Bottomley , David Barrow , Rajaram Ramesh , Clarence V. Roberts
IPC分类号： H04L2730
CPC分类号： H04B1/7075 , H04B1/70752 , H04B1/70758 , H04B1/7093 , H04B1/7095 , H04B1/7115 , H04B2201/70711
摘要： A flexible sliding correlator for use in a spread spectrum receiver divides baseband signal samples into different groups, associates each group with a different section of a spreading code, and combines ones of the signal samples with corresponding values in the spreading code section. The groupings and spreading code sections can be changed during operation of the receiver to maximize performance of the receiver under different or changing conditions. In addition, the sample and spreading code value combinations can be further combined in different ways, and the further combinations can be changed during operation of the receiver. According to another aspect of the invention, the baseband signal can be sampled either uniformly or non-uniformly. The phase and frequency of the baseband sampling can be adjusted during operation of the receiver so that samples are taken very close to the optimum sampling position, at the peak of a chip waveform in the baseband signal.
摘要翻译：用于扩展频谱接收机的灵活的滑动相关器将基带信号样本分成不同的组，每个组与扩展码的不同部分相关联，并将信号样本中的一个与扩展码部分中的相应值组合。可以在接收机的操作期间改变分组和扩展码部分，以在不同或变化的条件下最大化接收机的性能。此外，样本和扩展码值组合可以以不同的方式进一步组合，并且可以在接收机的操作期间改变进一步的组合。根据本发明的另一方面，可以均匀地或不均匀地采样基带信号。基带采样的相位和频率可以在接收机工作期间进行调整，使样本在基带信号的芯片波形峰值处非常接近最佳采样位置。

88. 发明授权

US06252918B1 Method and apparatus for digital symbol detection using medium response estimates 有权
标题翻译：使用介质响应估计的数字符号检测方法和装置
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。

89. 发明授权

US06226507B1 Apparatus and method for selecting between a plurality of antennas utilized by a microcellular communications terminal for reception of a signal 失效
标题翻译：用于在微蜂窝通信终端利用的用于接收信号的多个天线之间进行选择的装置和方法
公开(公告)号：US06226507B1
公开(公告)日：2001-05-01
申请号：US09017829
申请日：1998-02-03
申请人： Rajaram Ramesh , Sandeep Chennakeshu
发明人： Rajaram Ramesh , Sandeep Chennakeshu
IPC分类号： H04B106
CPC分类号： H04B7/082 , H04B7/0842
摘要： An apparatus and method for selecting between a plurality of antennas utilized by a microcellular communications terminal for reception of a signal, wherein a gain imbalance exists between the antennas.
摘要翻译：一种用于在微蜂窝通信终端利用的多个天线之间进行选择以接收信号的装置和方法，其中天线之间存在增益不平衡。

90. 发明授权

US6157820A Pilot strength measurement and multipath delay searcher for CDMA receiver 失效
标题翻译： CDMA接收机的导频强度测量和多径延迟搜索器
公开(公告)号：US6157820A
公开(公告)日：2000-12-05
申请号：US96960
申请日：1998-06-12
申请人： Essam Abdelfattah Sourour , Greg Bottomley , Rajaram Ramesh
发明人： Essam Abdelfattah Sourour , Greg Bottomley , Rajaram Ramesh
IPC分类号： H04B1/7115 , H04B7/26 , H04B17/00 , H04Q7/36
CPC分类号： H04B17/318 , H04B1/7115
摘要： A method and apparatus for evaluating signal strength of a channel received at a mobile station within a spread spectrum communication systems is disclosed. If the receiver at the mobile station receives a spread spectrum signal, a first sampling means converts the received signal into a first sample stream as a first sampling. A second sampling means converts the first sample stream into a second sample stream at a second sample rate, different from the first sample rate. The signal strength of a pilot channel is measured based upon the first and second sample streams.
摘要翻译：公开了一种用于评估在扩展频谱通信系统内在移动站处接收的信道的信号强度的方法和装置。如果移动站处的接收机接收到扩频信号，则第一采样装置将接收到的信号转换为第一采样流作为第一采样。第二采样装置以与第一采样率不同的第二采样率将第一采样流转换成第二采样流。基于第一和第二采样流来测量导频信道的信号强度。

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