公开(公告)号：WO2006069317A2

公开(公告)日：2006-06-29

申请号：PCT/US2005/046803

申请日：2005-12-21

Applicant: QUALCOMM INCORPORATED ,  JULIAN, David Jonathan ,  AGRAWAL, Avneesh ,  TEAGUE, Edward Harrison

Inventor： JULIAN, David Jonathan ,  AGRAWAL, Avneesh ,  TEAGUE, Edward Harrison

IPC: H04L1/18 ,  H04L1/20

CPC classification number: H04L1/1867 ,  H04L1/1819 ,  H04L1/20

Abstract: Method and apparatus for transmission of information in multiple access communication system is claim. Information using incremental redundancy is transmitted. A determination is made as to whether reverse link performance drops below a predetermined threshold. Determination of reverse link performance may be done in variety of ways, including use of a filter percentage of ACK erasures, measured error rates on the reverse link control channel, reverse link data channel error rates, and other methods. Upon determination of channel degradation, the access point can decide whether to ignore messages sent from the access terminal to instruct the access terminal to cease transmission.

Abstract translation: 一种用于在多址通信系统中传输信息的方法和装置。 发送使用增量冗余的信息。 确定反向链路性能是否下降到预定阈值以下。 反向链路性能的确定可以以各种方式进行，包括使用ACK擦除的滤波器百分比，反向链路控制信道上的测量误码率，反向链路数据信道错误率等方法。 在确定信道劣化时，接入点可以决定是否忽略从接入终端发送的消息，指示接入终端停止发送。

公开(公告)号：WO2006020032A1

公开(公告)日：2006-02-23

申请号：PCT/US2005/025170

申请日：2005-07-14

Applicant: QUALCOMM INCORPORATED ,  KHANDEKAR, Aamod ,  AGRAWAL, Avneesh

Inventor： KHANDEKAR, Aamod ,  AGRAWAL, Avneesh

IPC: H04L1/00 ,  H04L1/20 ,  H04L5/02 ,  H04Q7/38

CPC classification number: H04L1/0015 ,  H04L1/0002 ,  H04L1/0006 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/1812 ,  H04L1/20 ,  H04L5/0007 ,  H04L5/0012 ,  H04L5/006 ,  H04L27/2601 ,  H04W16/02 ,  H04W16/12

Abstract: Apparatus and methods for rate prediction in a wireless communication system having fractional frequency reuse are disclosed. A wireless communication system implementing Orthogonal Frequency Division Multiple Access (OFDMA) can implement a fractional frequency reuse plan where a portion of carriers is allocated for terminals not anticipating handoff and another portion of the carriers is reserved for terminals having a higher probability of handoff. Each of the portions can define a reuse set. The terminals can be constrained to frequency hop within a reuse set. The terminal can also be configured to determine a reuse set based on a present assignment of a subset of carriers. The terminal can determine a channel estimate and a channel quality indicator based in part on at least the present reuse set. The terminal can report the channel quality indicator to a source, which can determine a rate based on the index value.

Abstract translation: 公开了具有分数次频率重用的无线通信系统中的速率预测装置和方法。 实现正交频分多址（OFDMA）的无线通信系统可以实现分数频率复用计划，其中一部分载波被分配给不预期切换的终端，另一部分载波被保留用于具有较高切换概率的终端。 每个部分可以定义重用集合。 终端可以被限制在重用集合内的跳频。 终端还可以被配置为基于载波子集的当前分配来确定重用集合。 所述终端可以部分地至少基于所述重用集合来确定信道估计和信道质量指示符。 终端可以将信道质量指示符报告给源，可以根据索引值确定速率。

公开(公告)号：WO2006019709A1

公开(公告)日：2006-02-23

申请号：PCT/US2005/024613

申请日：2005-07-11

Applicant: QUALCOMM INCORPORATED ,  GORE, Dhananjay Ashok ,  AGRAWAL, Avneesh ,  KHANDEKAR, Aamod ,  GOROKHOV, Alexei

Inventor： GORE, Dhananjay Ashok ,  AGRAWAL, Avneesh ,  KHANDEKAR, Aamod ,  GOROKHOV, Alexei

IPC: H04L27/26

CPC classification number: H04L27/2647 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/006 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/023

Abstract: A channel estimation system comprises a filtering component that selectively scales a plurality of carriers as a function of location of the plurality of carriers within a frequency band, wherein the plurality of carriers comprises at least one data carrier and at least one pilot carrier. A component thereafter extrapolates an observation from the at least one pilot carrier, wherein a channel is estimated as a function of the extrapolated observation. The scaling of the carriers facilitates reducing a flooring effect associated with channel estimation. The filtering component can be employed at a transmitter and/or at a receiver, and can be activated and/or deactivated as a function of a sensed data packet type.

Abstract translation: 信道估计系统包括滤波部件，其选择性地按照频带内的多个载波的位置来缩放多个载波，其中多个载波包括至少一个数据载波和至少一个导频载波。 然后，组件从至少一个导频载波外推观测，其中，估计信道作为外推观测的函数。 载波的缩放有助于减少与信道估计相关的地板效应。 滤波组件可以在发射机和/或接收机处采用，并且可以作为感测数据分组类型的功能被激活和/或去激活。

公开(公告)号：WO2006010159A1

公开(公告)日：2006-01-26

申请号：PCT/US2005/025609

申请日：2005-07-18

Applicant: QUALCOMM INCORPORATED ,  GOROKHOV, Alexei ,  AGRAWAL, Avneesh ,  GORE, Dhananjay Ashok

Inventor： GOROKHOV, Alexei ,  AGRAWAL, Avneesh ,  GORE, Dhananjay Ashok

IPC: H04L25/02

CPC classification number: H04L25/0236 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/023 ,  H04L25/0248 ,  H04L27/2647

Abstract: Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to proviEstimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to provide a second estimate for the channel. A MMSE approach is followed where channel estimates and noise variance in an OFDM system are iteratively updted.

Abstract translation: 并行执行时变多载波多用户系统中的信道特性和干扰电平的估计。 为了执行估计，通过信道发送多个数据符号和专用导频符号。 接下来，针对干扰电平选择初始估计值。 干扰电平的初始估计值与接收到的导频符号一起使用以提供信道的第一估计。 信道的第一估计用于确定用于干扰电平的新的更新值，其又用于迭代地更新信道的第一估计值。 迭代继续，直到干扰电平和通道的迭代更新值满足预定义的限制。 数据符号和信道的最终更新值随后用于提供信道特性，同时执行时变多载波多用户系统中的干扰电平。 为了执行估计，通过信道发送多个数据符号和专用导频符号。 接下来，针对干扰电平选择初始估计值。 干扰电平的初始估计值与接收到的导频符号一起使用以提供信道的第一估计。 信道的第一估计用于确定用于干扰电平的新的更新值，其又用于迭代地更新信道的第一估计值。 迭代继续，直到干扰电平和通道的迭代更新值满足预定义的限制。 随后使用数据符号和信道的最终更新值来提供信道的第二估计。 遵循MMSE方法，其中OFDM系统中的信道估计和噪声方差被迭代地更新。

公开(公告)号：WO2005086440A1

公开(公告)日：2005-09-15

申请号：PCT/US2005/005907

申请日：2005-02-25

Applicant: QUALCOMM Incorporated ,  KHANDEKAR, Aamod ,  AGRAWAL, Avneesh ,  LING, Fuyun

Inventor： KHANDEKAR, Aamod ,  AGRAWAL, Avneesh ,  LING, Fuyun

IPC: H04L25/03

CPC classification number: H04L1/005 ,  H04L1/0071 ,  H04L25/0238 ,  H04L25/03171

Abstract: For an iterative channel and interference estimation and decoding scheme, prior information for channel gain and interference is initially obtained based on received pilot symbols. Forward information for code bits corresponding to received data symbols is derived based on the received data symbols and the prior information and then decoded to obtain feedback information for the code bits corresponding to the received data symbols. A posteriori information for channel gain and interference for each received data symbol is derived based on the feedback information for that received data symbol. The a posteriori information for the received data symbols and the prior information are combined to obtain updated information for channel gain and interference for each received data symbol. The process can be repeated for any number of iterations. The prior, a posteriori , and updated information may be represented by joint probability distributions on channel gain and interference. The forward and feedback information may be represented by log-likelihood ratios.

Abstract translation: 对于迭代信道和干扰估计和解码方案，首先基于接收到的导频符号获得用于信道增益和干扰的先验信息。 基于接收到的数据符号和先验信息导出与接收到的数据符号相对应的码位的转发信息，然后解码，以获得与接收到的数据符号对应的码位的反馈信息。 基于该接收到的数据符号的反馈信息导出每个接收到的数据符号的信道增益和干扰的后验信息。 组合接收到的数据符号和先验信息的后验信息以获得每个接收到的数据符号的信道增益和干扰的更新信息。 该过程可以重复任意次数的迭代。 先前的，后验的和更新的信息可以由通道增益和干扰的联合概率分布来表示。 正向和反馈信息可以由对数似然比表示。

公开(公告)号：WO2005043948A3

公开(公告)日：2005-05-12

申请号：PCT/US2004/036285

申请日：2004-10-28

Applicant: QUALCOMM INCORPORATED ,  JI, Tingfang ,  AGRAWAL, Avneesh ,  TEAGUE, Edward, H.

Inventor： JI, Tingfang ,  AGRAWAL, Avneesh ,  TEAGUE, Edward, H.

IPC: H04Q7/36

Abstract: For restrictive reuse, each cell (or each sector) is assigned (1) a set of usable subbands that may be allocated to users in the cell and (2) a set of forbidden subbands that is not used. The usable and forbidden sets for each cell are orthogonal to one other. The usable set for each cell also overlaps the forbidden set for each neighboring cell. A user u in a cell x may be allocated subbands in the usable set for that cell. If user u observes/causes high level of interference from/to a neighboring cell y , then user u may be allocated subbands from a "restricted" set containing subbands included in both the usable set for cell x and the forbidden set for cell y. User u would then observe/cause no interference from/to cell y . The subband restriction may be extended to avoid interference from multiple neighboring cells.

公开(公告)号：WO2005036894A2

公开(公告)日：2005-04-21

申请号：PCT/US2004/020278

申请日：2004-06-23

Applicant: QUALCOMM, INCORPORATED ,  AGRAWAL, Avneesh

Inventor： AGRAWAL, Avneesh

IPC: H04Q

CPC classification number: H04B1/715 ,  H04B2001/7154 ,  H04L5/0021 ,  H04L5/0044 ,  H04L5/0089 ,  H04W8/26 ,  H04W36/18 ,  H04W48/16

Abstract: Techniques are provided to manage interference for soft handoff and broadcast services in a wireless frequency hopping communication system (e.g., an OFDMA system). These techniques may be used for the forward and reverse links. In a first scheme, an FH function ƒ sho ( r, T ) is used for soft-handoff users, an FH function ƒ si ( k, T ) is used for users not in soft handoff in each sector S i , and the FH function ƒ si ( k, T ) is modified to be orthogonal to the FH function ƒ sho ( r, T ) if and when necessary. In a second scheme, the FH function ƒ sho ( r, T ) used for soft-handoff users is defined to be orthogonal to or have low correlation with the FH function ƒ si ( k, T ) used for users not in soft handoff in each sector S i , so that modification of the FH function ƒ si ( k, T ) is not needed. The FH function ƒ si ( k, T ) for each sector may be defined to be pseudo-random with respect to the FH functions ƒ si ( k, T ) for other sectors.

Abstract translation: 提供技术来管理在无线跳频通信系统（例如，OFDMA系统）中的软切换和广播服务的干扰。 这些技术可以用于正向和反向链路。 在第一种方案中，对于软切换用户使用FH功能fsho（r，T），对于每个扇区Si中不处于软切换的用户使用FH功能fsi（k，T），并且FH功能fsi（k， k，T）被修改为与必要时的FH函数fsho（r，T）正交。 在第二方案中，用于软切换用户的FH功能fsho（r，T）被定义为与每个扇区中不处于软切换的用户的FH功能fsi（k，T）正交或具有低相关性 Si，因此不需要修改FH函数fsi（k，T）。 每个扇区的FH函数fsi（k，T）可以相对于其他扇区的FH函数fsi（k，T）被定义为伪随机的。

公开(公告)号：WO2005032035A1

公开(公告)日：2005-04-07

申请号：PCT/US2004/031828

申请日：2004-09-27

Applicant: QUALCOMM INCORPORATED ,  MANTRAVADI, Ashok ,  AGRAWAL, Avneesh

Inventor： MANTRAVADI, Ashok ,  AGRAWAL, Avneesh

IPC: H04L1/06

CPC classification number: H04L1/0618 ,  H04B7/0669 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071 ,  H04L27/3488 ,  H04L2001/0093

Abstract: Techniques are provided for performing hierarchical coding in a multi-antenna communication system (e.g., a SIMO, MISO, or MIMO system). At a transmitter, a base stream and an enhancement stream are coded and modulated separately to obtain first and second data symbol streams, respectively. The first data symbol stream is processed in accordance with a first spatial processing scheme (e.g., a transmit diversity or a spatial multiplexing scheme) to obtain a first set of symbol substreams. The second data symbol stream is processed in accordance with a second spatial processing scheme (e.g., transmit diversity or spatial multiplexing) to obtain a second set of symbol substreams. The first set of symbol substreams is combined (e.g., using time division multiplexing or superposition) with the second set of symbol substreams to obtain multiple transmit symbol streams for transmission from multiple transmit antennas. A receiver performs complementary processing to recover the base stream and enhancement stream.

Abstract translation: 提供了用于在多天线通信系统（例如，SIMO，MISO或MIMO系统）中执行分级编码的技术。 在发射机处，分别对基本流和增强流进行编码和调制，以分别获得第一和第二数据符号流。 根据第一空间处理方案（例如，发射分集或空间复用方案）来处理第一数据符号流，以获得第一组符号子流。 根据第二空间处理方案（例如，发射分集或空间复用）处理第二数据符号流，以获得第二组符号子流。 第一组符号子流组合（例如，使用时分复用或叠加）与第二组符号子流，以获得用于从多个发射天线发射的多个发射符号流。 接收机执行补充处理以恢复基流和增强流。

公开(公告)号：WO2004104530A2

公开(公告)日：2004-12-02

申请号：PCT/US2004/015204

申请日：2004-05-14

Applicant: QUALCOMM INCORPORATED ,  SUTIVONG, Arak ,  NAGUIB, Ayman, Fawzy ,  AGRAWAL, Avneesh

Inventor： SUTIVONG, Arak ,  NAGUIB, Ayman, Fawzy ,  AGRAWAL, Avneesh

IPC: G01H

CPC classification number: H04L1/20 ,  H04L27/2647

Abstract: Noise and interference can be independently measured in a multiple user Orthogonal Frequency Division Multiplexing (OFDM) system. Co-channel interference is measured in a frequency hopping, multiple user, OFDM system by tracking the sub-carriers assigned to all users in a particular service area or cell. The composite noise plus interference can be determined by measuring the amount of received power in a sub-carrier whenever it is not assigned to any user in the cell. A value is stored for each sub-carrier in the system and the value of noise plus interference can be a weighted average of the present value with previously stored values. The noise component can be independently determined in a synchronous system. In the synchronous system, all users in a system may periodically be prohibited from broadcasting over a sub-carrier and the received power in the sub-carrier measured during the period having no broadcasts.

Abstract translation: 噪声和干扰可以在多用户正交频分复用（OFDM）系统中独立测量。 通过跟踪分配给特定服务区域或小区中的所有用户的子载波，在跳频，多用户OFDM系统中测量同信道干扰。 复合噪声加干扰可以通过在分配给单元中的任何用户的情况下测量子载波中的接收功率的量来确定。 对于系统中的每个子载波存储值，并且噪声加干扰的值可以是具有先前存储的值的当前值的加权平均值。 噪声分量可以在同步系统中独立确定。 在同步系统中，系统中的所有用户可以周期地禁止通过子载波进行广播，并且在没有广播的时段期间测量的子载波中的接收功率。

公开(公告)号：WO2004102816A2

公开(公告)日：2004-11-25

申请号：PCT/US2004/014453

申请日：2004-05-07

Applicant: QUALCOMM INCORPORATED ,  AGRAWAL, Avneesh ,  TEAGUE, Edward, Harrison

Inventor： AGRAWAL, Avneesh ,  TEAGUE, Edward, Harrison

IPC: H04B

CPC classification number: H04L27/2613 ,  H04B1/713 ,  H04B2201/70701 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0041 ,  H04L5/0051 ,  H04L25/0232 ,  H04L25/03866 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03509 ,  H04L2025/03789

Abstract: Techniques are provided to support fast frequency hopping with a code division multiplexed (CDM) pilot in a multi-carrier communication system (e.g., an OFDMA system). Each transmitter (e.g., each terminal) in the system transmits a wideband pilot on all subbands to allow a receiver (e.g., a base station) to estimate the entire channel response at the same time. The wideband pilot for each transmitter may be generated using direct sequence spread spectrum processing and based on a pseudo-random number (PN) code assigned to that transmitter. This allows the receiver to individually identify and recover multiple wideband pilots transmitted concurrently by multiple transmitters. For a time division multiplexed (TDM)/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in bursts. For a continuous CDM pilot transmission scheme, each transmitter continuously transmits the wideband pilot, albeit at a low transmit power level. Any frequency hopping rate may be supported without impacting pilot overhead.

Abstract translation: 提供技术以在多载波通信系统（例如，OFDMA系统）中用码分多路复用（CDM）导频来支持快速跳频。 系统中的每个发射机（例如，每个终端）在所有子带上发送宽带导频，以允许接收机（例如，基站）同时估计整个信道响应。 可以使用直接序列扩频处理并基于分配给该发射机的伪随机数（PN）码来生成每个发射机的宽带导频。 这允许接收机单独地识别和恢复由多个发射机同时传输的多个宽带导频。 对于时分复用（TDM）/ CDM导频传输方案，每个发射机以突发方式发送宽带导频。 对于连续的CDM导频传输方案，每个发射机连续发射宽带导频，尽管传输功率水平较低。 可以支持任何跳频率，而不会影响导频开销。