公开(公告)号：US08571132B2

公开(公告)日：2013-10-29

申请号：US11315744

申请日：2005-12-21

申请人： Aamod Khandekar ,  Avneesh Agrawal

发明人： Aamod Khandekar ,  Avneesh Agrawal

IPC分类号： H04L27/00 ,  H04L27/06 ,  H04J7/00

CPC分类号： H04B1/713 ,  H04B7/02 ,  H04L1/0029 ,  H04L5/0023 ,  H04L5/0039 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/006 ,  H04L5/0094 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232

摘要： Embodiments described provide for channel estimation and resource allocation for a transmission to a wireless device. The frequency band is partitioned into at least two contiguous subbands. A determination is made whether it is desirable to transmit in a single subband or in more than one subband. The transmission is assigned to occur in either the single subband or to operate in more than one subband. If the transmission is restricted to one subband, the hop pattern is also restricted to subcarriers within the particular subband.

摘要翻译： 所描述的实施例提供了用于向无线设备的传输的信道估计和资源分配。 将频带划分为至少两个连续的子带。 确定是否希望在单个子带中或在多于一个子带中进行发送。 传输被分配发生在单个子带中或在多个子带中操作。 如果传输被限制到一个子带，则跳频模式也被限制在特定子带内的子载波上。

公开(公告)号：US08484272B2

公开(公告)日：2013-07-09

申请号：US11022537

申请日：2004-12-22

申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

IPC分类号： G06F17/14

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/03834 ,  H04L27/0008 ,  H04L27/2607 ,  H04L27/2626 ,  H04L27/2647

摘要： To transmit a multi-carrier signal, a transmitter provides zero symbols for guard subbands, performs OFDM modulation, and filters the resultant time-domain samples with a pulse shaping filter. To transmit a single-carrier signal, the transmitter partitions the single-carrier signal into segments. Each segment contains up to K samples and is padded, if needed, to the length of an OFDM symbol. Each padded segment is transformed from the time domain to the frequency domain to generate a corresponding frequency-domain segment with K symbols. For each frequency-domain segment, the symbols corresponding to the guard subbands are set to zero. Each frequency-domain segment is then transformed from the frequency domain to the time domain to generate a corresponding time-domain segment. A cyclic prefix may or may not be appended to each time-domain segment. Each time-domain segment is filtered with the same pulse shaping filter to generate an output waveform for the single-carrier signal.

摘要翻译： 为了发送多载波信号，发射机为保护子带提供零符号，执行OFDM调制，并用脉冲整形滤波器对合成的时域采样进行滤波。 为了发送单载波信号，发射机将单载波信号分割成段。 每个段包含多达K个样本，并且如果需要，则填充到OFDM符号的长度。 每个填充段从时域变换到频域，以产生具有K个符号的对应的频域段。 对于每个频域段，对应于保护子带的符号被设置为零。 然后将每个频域段从频域变换到时域以产生对应的时域段。 循环前缀可以附加到每个时域段，也可以不附加到每个时域段。 每个时域分段用相同的脉冲整形滤波器滤波，以产生单载波信号的输出波形。

公开(公告)号：US08085875B2

公开(公告)日：2011-12-27

申请号：US11128976

申请日：2005-05-13

申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Aamod Khandekar

IPC分类号： H04L27/00

CPC分类号： H04L25/0226 ,  H04L5/0007 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/006

摘要： Dynamic resource allocation systems, apparatus, and methods are disclosed for selectively improving the ability of a receiver to determine a channel estimate in an Orthogonal Frequency Division Multiple Access (OFDMA) system. A wireless communication system can use a common pilot channel configuration to aid channel estimation in one or more receivers in communication with the system. A receiver in communication with the system may be unable to demodulate received data due to an inaccurate channel estimate. The receiver can communicate to a transmitter in the system a request for additional channel estimation resources. The wireless communication system can provide additional channel estimation resources by inserting dedicated pilot channels into one or more of the frequencies allocated to symbols for the receiver. If the receiver is still unable to demodulate received data, the wireless communication system can incrementally insert additional pilot channels in the symbol associated with the receiver.

摘要翻译： 公开了动态资源分配系统，装置和方法，用于选择性地提高接收机在正交频分多址（OFDMA）系统中确定信道估计的能力。 无线通信系统可以使用公共导频信道配置来辅助与系统通信的一个或多个接收机中的信道估计。 与系统通信的接收机可能由于不准确的信道估计而无法解调所接收的数据。 接收机可以向系统中的发射机通信另外的信道估计资源的请求。 无线通信系统可以通过将专用导频信道插入分配给接收机的符号的一个或多个频率来提供额外的信道估计资源。 如果接收机仍然不能解调所接收的数据，则无线通信系统可以递增地在与接收机相关联的符号中插入附加的导频信道。

公开(公告)号：US08068530B2

公开(公告)日：2011-11-29

申请号：US11022519

申请日：2004-12-22

申请人： Aamod Khandekar ,  Avneesh Agrawal

发明人： Aamod Khandekar ,  Avneesh Agrawal

IPC分类号： H04B1/00

CPC分类号： H04L5/0048 ,  H04B1/7077 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04L5/0026 ,  H04L25/0204 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675

摘要： Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K1 different time offsets and identifies K2 strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.

公开(公告)号：US20090149140A1

公开(公告)日：2009-06-11

申请号：US11620030

申请日：2007-01-04

申请人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

发明人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

IPC分类号： H04B1/04

CPC分类号： H04W52/247 ,  H04W52/241 ,  H04W52/243 ,  H04W52/60 ,  Y02D70/10

摘要： Systems and methodologies are described that facilitate mitigation of interference in a wireless communication environment. Terminals can utilize interference information provided by neighboring sectors to adjust transmit power and reduce interference. Access points can provide two sets or types of interference information. The first type can be transmitted over a large coverage area, requiring significant overhead and limiting the transmission rate. Access points can also provide a second set or type of interference information directed at smaller coverage area, such as an area proximate to the edge of the supported sector. This second type of interference information can be utilized by terminals that include the access point within their active set. The second set of interference information can be provided at a higher rate than the first set due to decreased overhead requirements. Terminals can utilize both sets of interference information to adjust transmit power.

摘要翻译： 描述了有助于减轻无线通信环境中的干扰的系统和方法。 终端可以利用相邻扇区提供的干扰信息来调整发射功率并减少干扰。 接入点可以提供两组或多种干扰信息。 第一种类型可以在大的覆盖区域上传输，需要大量开销并限制传输速率。 接入点还可以提供针对较小覆盖区域的第二组或干扰类型，例如靠近所支持扇区边缘的区域。 这种第二类型的干扰信息可以由包括其活动集中的接入点的终端利用。 由于降低的开销要求，可以以比第一组更高的速率提供第二组干扰信息。 终端可以利用两组干扰信息来调整发射功率。

公开(公告)号：US20090075664A1

公开(公告)日：2009-03-19

申请号：US12206528

申请日：2008-09-08

申请人： Ravi Palanki ,  Avneesh Agrawal ,  Aamod Khandekar

发明人： Ravi Palanki ,  Avneesh Agrawal ,  Aamod Khandekar

IPC分类号： H04W40/00

CPC分类号： H04L25/4902 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0053 ,  H04L27/2601

摘要： Techniques for transmitting information using beacon symbols are described. A transmitter may map first information to at least one subcarrier in a first set of subcarriers, with the first information being conveyed by the position of the at least one subcarrier. The transmitter may map second information to one or more subcarriers in a second set of subcarriers. The second information may be conveyed by one or more modulation symbols sent on the one or more subcarriers. The transmitter may generate at least one beacon symbol having the first information mapped to the at least one subcarrier in the first set and the second information mapped to the one or more subcarriers in the second set. In one design, the transmitter may frequency division multiplex the first information with the second information. In another design, the transmitter may puncture the second information on the at least one subcarrier with the first information.

摘要翻译： 描述了使用信标符号发送信息的技术。 发射机可以将第一信息映射到第一组子载波中的至少一个子载波，其中第一信息由至少一个子载波的位置传送。 发射机可以将第二信息映射到第二组子载波中的一个或多个子载波。 第二信息可以由在一个或多个子载波上发送的一个或多个调制符号传送。 发射机可以生成具有映射到第一组中的至少一个子载波的第一信息和映射到第二组中的一个或多个子载波的第二信息的至少一个信标符号。 在一种设计中，发射机可以将第一信息与第二信息进行频分复用。 在另一种设计中，发射机可以利用第一信息来对该至少一个子载波的第二信息进行穿孔。

公开(公告)号：US20070011550A1

公开(公告)日：2007-01-11

申请号：US11441742

申请日：2006-05-25

申请人： Avneesh Agrawal ,  Aamod Khandekar ,  Hemanth Sampath ,  Tamer Kadous

发明人： Avneesh Agrawal ,  Aamod Khandekar ,  Hemanth Sampath ,  Tamer Kadous

IPC分类号： H04L1/00 ,  H03M13/00 ,  G08C25/00 ,  G06F11/00 ,  G06F11/30

CPC分类号： H04B7/0697 ,  H04L1/0001 ,  H04L1/0006 ,  H04L1/0026 ,  H04L1/1812 ,  H04L1/1893

摘要： Systems and methodologies are described that facilitate reducing rank (e.g., of a user device) as a number of transmissions there from increases. Such rank step-down can improve interference resistance and facilitate maintaining code rate despite transmission propagation. Additionally, rank step-down information can be encoded along with CQI information to generate a 5-bit CQI signal that can facilitate updating a user's rank upon each CQI transmission (e.g., approximately every 5 ms). The described systems and/or methods can be employed in a single code word (SCW) wireless communication environment with a hybrid automatic request (HARQ) protocol.

摘要翻译： 描述的系统和方法被简化为有助于减少等级（例如，用户设备），因为其中的传输数量增加。 这种排序降低可以改善抗干扰性，并且有助于保持代码率，尽管传输传播。 此外，等级降级信息可以与CQI信息一起编码，以产生可以有助于在每次CQI传输（例如，大约每5ms）更新用户的等级的5比特CQI信号。 所描述的系统和/或方法可以用于具有混合自动请求（HARQ）协议的单个码字（SCW）无线通信环境中。

公开(公告)号：US20060133533A1

公开(公告)日：2006-06-22

申请号：US11022538

申请日：2004-12-22

申请人： Aamod Khandekar ,  Avneesh Agrawal

发明人： Aamod Khandekar ,  Avneesh Agrawal

IPC分类号： H04L27/18 ,  H04L27/06

CPC分类号： H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0054 ,  H04L1/1671 ,  H04L1/1819 ,  H04L1/1845 ,  H04L1/1861 ,  H04L1/1893 ,  Y02D50/10

摘要： Techniques for using multiple modulation schemes for a single packet are described. Each data packet is processed and transmitted in up to T blocks, where T>1. Multiple modulation schemes are used for the T blocks to achieve good performance. A transmitter encodes a data packet to generate code bits. The transmitter then forms a block of code bits with the code bits generated for the packet, determines the modulation scheme to use for the block (e.g., based on a mode/rate selected for the packet), maps the code bits for the block based on the modulation scheme to obtain data symbols, and processes and transmits the block of data symbols to a receiver. The transmitter generates and transmits another block in similar manner until the data packet is decoded correctly or all T blocks have been transmitted. The receiver performs the complementary processing to receive and decode the packet.

摘要翻译： 描述了对于单个分组使用多个调制方案的技术。 每个数据包被处理并传输到最多T个块，其中T> 1。 多个调制方案用于T块以实现良好的性能。 发射机对数据包进行编码以产生码位。 然后，发射机形成具有为分组生成的码位的码位块，确定用于块的调制方案（例如，基于为分组选择的模式/速率），将基于块的码位映射 在调制方案中获得数据符号，并且处理并将数据符号块发送到接收机。 发射机以类似的方式生成和发送另一个块，直到数据分组被正确解码或者所有T块已被发送。 接收机执行补充处理以接收和解码分组。

公开(公告)号：US09860033B2

公开(公告)日：2018-01-02

申请号：US13271113

申请日：2011-10-11

申请人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

发明人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

IPC分类号： H04L5/00 ,  H04L27/26 ,  H04B7/04 ,  H04B7/06 ,  H04B7/0456

CPC分类号： H04L5/0023 ,  H04B7/0456 ,  H04B7/061 ,  H04B7/0671 ,  H04B7/0691 ,  H04B7/0697 ,  H04L27/2602

摘要： Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

公开(公告)号：US09603062B2

公开(公告)日：2017-03-21

申请号：US12269642

申请日：2008-11-12

申请人： Gavin B. Horn ,  Fatih Ulupinar ,  Parag A. Agashe ,  Rajat Prakash ,  Aamod Khandekar ,  Alexei Gorokhov ,  Naga Bhushan

发明人： Gavin B. Horn ,  Fatih Ulupinar ,  Parag A. Agashe ,  Rajat Prakash ,  Aamod Khandekar ,  Alexei Gorokhov ,  Naga Bhushan

IPC分类号： H04W36/00

CPC分类号： H04W36/0055

摘要： Systems and methodologies are described that facilitate grouping pilot identifies to indicate type and/or classification information regarding one or more access points. The access points can select or be assigned pilot identifiers from the group indicating a type or classification related to the access points. Thus, identifiers can be grouped into macrocell and/or femtocell groups or ranges such that an access point can indicate, and mobile devices can efficiently determine, whether the access point provides macrocell or femtocell coverage based on a range from which its pilot identifier is selected or assigned. In addition, the pilot identifiers can be utilized to indicate restricted association information regarding the access points.