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公开(公告)号：US08825046B2
公开(公告)日：2014-09-02
申请号：US12261998
申请日：2008-10-30
申请人： Mohammad J. Borran , Aamod Khandekar , Naga Bhushan , Ashwin Sampath , Alexei Gorokhov , Avneesh Agrawal , Ravi Palanki , Gavin B. Horn
发明人： Mohammad J. Borran , Aamod Khandekar , Naga Bhushan , Ashwin Sampath , Alexei Gorokhov , Avneesh Agrawal , Ravi Palanki , Gavin B. Horn
CPC分类号： H04W72/048 , H04W52/242 , H04W52/243 , H04W52/28 , H04W52/325 , H04W52/34
摘要： Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a serving base station may send a message to a terminal to trigger short-term interference mitigation. In response, the terminal may send a message to request at least one interfering base station to reduce interference on at least one resource. Each interfering base station may determine a transmit power level to be used for the at least one resource and may send a pilot at this transmit power level. The terminal may estimate the channel quality of the at least one resource based on at least one pilot received from the at least one interfering base station. The terminal may send information indicative of the estimated channel quality to the serving base station. The serving base station may send a data transmission on the at least one resource to the terminal.
摘要翻译： 描述了在无线通信系统中发送具有短期干扰抑制的数据的技术。 在一种设计中，服务基站可以向终端发送消息以触发短期干扰减轻。 作为响应，终端可以发送消息以请求至少一个干扰基站以减少对至少一个资源的干扰。 每个干扰基站可以确定要用于至少一个资源的发射功率电平，并且可以以该发射功率电平发送导频。 终端可以基于从至少一个干扰基站接收的至少一个导频来估计至少一个资源的信道质量。 终端可以向服务基站发送表示估计的信道质量的信息。 服务基站可以向终端发送至少一个资源上的数据传输。
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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
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。
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公开(公告)号：US08484272B2
公开(公告)日：2013-07-09
申请号：US11022537
申请日：2004-12-22
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。
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公开(公告)号：US08477684B2
公开(公告)日：2013-07-02
申请号：US11943551
申请日：2007-11-20
申请人： Aamod Khandekar , Alexei Gorokhov , Avneesh Agrawal , Sundeep Rangan , Arnab Das
发明人： Aamod Khandekar , Alexei Gorokhov , Avneesh Agrawal , Sundeep Rangan , Arnab Das
IPC分类号： H04W4/00
CPC分类号： H04L1/1607 , H04L5/0007 , H04L5/0023 , H04L5/0053 , H04W72/0413 , H04W72/042
摘要： Techniques for sending control messages are described. In an aspect, assignment messages may be acknowledged based on either linked or dedicated acknowledgement (ACK) resources. A terminal may receive an assignment message from a base station, determine whether to acknowledge the assignment message, and determine ACK resources to use to acknowledge the assignment message. The ACK resources may be linked to a control block on which the assignment message was received, linked to resources given by the assignment message, or assigned to the terminal. The terminal may send the acknowledgement on the ACK resources. In another aspect, a control message may be acknowledged based on ACK resources determined based on the control message or the control block. The ACK resources may be linked to resources assigned by the control message or linked to the control message. The terminal may send an acknowledgement for the control message on the ACK resources.
摘要翻译： 描述用于发送控制消息的技术。 在一方面，可以基于链接或专用确认（ACK）资源来确认分配消息。 终端可以从基站接收分配消息，确定是否确认分配消息，并确定用于确认分配消息的ACK资源。 ACK资源可以链接到其上接收到分配消息的控制块，链接到由分配消息给出的资源或分配给终端。 终端可以在ACK资源上发送确认。 在另一方面，可以基于基于控制消息或控制块确定的ACK资源来确认控制消息。 ACK资源可以链接到由控制消息分配或链接到控制消息的资源。 终端可以在ACK资源上发送关于控制消息的确认。
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公开(公告)号：US08085875B2
公开(公告)日：2011-12-27
申请号：US11128976
申请日：2005-05-13
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。
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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.
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公开(公告)号：US20110255518A9
公开(公告)日：2011-10-20
申请号：US11370639
申请日：2006-03-07
IPC分类号： H04B7/216
CPC分类号： H04W72/042 , H04L5/0044 , H04L5/0053 , H04L5/0096 , H04W72/0486
摘要： Systems and methodologies are described that facilitate dynamically supplementing or decrementing resource assignments to mobile devices in a wireless network environment without requiring transmission of replacement assignments. Supplemental assignments can be generated based on information related to mobile device need and resource availability. Moreover, resource assignments can be persisted for a mobile device.
摘要翻译： 描述了促进在无线网络环境中动态地补充或递减对移动设备的资源分配的系统和方法，而不需要传输替换分配。 可以根据与移动设备需求和资源可用性相关的信息生成补充分配。 此外，可以为移动设备持续资源分配。
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公开(公告)号：US20090149140A1
公开(公告)日：2009-06-11
申请号：US11620030
申请日：2007-01-04
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。
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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。
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公开(公告)号：US20090046713A1
公开(公告)日：2009-02-19
申请号：US12188851
申请日：2008-08-08
IPC分类号： H04L12/56
CPC分类号： H04L1/1819 , H04L1/1854
摘要： Acknowledgments (ACKs/NACKs) are suppressed when transmitting non-decodable packets in a communication system that utilizes HARQ. Non-decodable packets are transmitted to save system bandwidth and make the overall spectral efficiency higher. The transmitter and receiver know that in HARQ when the transmitter transmits a non-decodable packet to the receiver, this will cause the receiver to automatically transmit back a NACK. The transmitter and receiver exploit this fact by discarding and/or not transmitting the NACK (respectively).
摘要翻译： 在使用HARQ的通信系统中发送不可解码分组时，确认（ACK / NACK）被抑制。 传输不可解码数据包以节省系统带宽，使总体频谱效率更高。 发射机和接收机知道，当发射机向接收机发送不可解码的分组时，在HARQ中，这将导致接收机自动发送NACK。 发射机和接收机通过分别丢弃和/或不发送NACK来分别利用这一事实。
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