公开(公告)号：US06631124B1

公开(公告)日：2003-10-07

申请号：US09432989

申请日：1999-11-03

申请人： Havish Koorapaty ,  Yi-Pin Eric Wang ,  Paul W. Dent

发明人： Havish Koorapaty ,  Yi-Pin Eric Wang ,  Paul W. Dent

IPC分类号： H04J300

CPC分类号： H04W72/08 ,  H04B7/2618 ,  H04W48/06

摘要： A wireless communications system including at least one base station operative to communicate with terminals on a plurality of carrier frequencies in repetitive time slots defined thereon is operated by assigning an entire time slot or a spreading-code defined subchannel of a time slot to a terminal based on a communications constraint associated with the terminal. The communications constraint may include a performance requirement, such as an information rate or an error rate, and a signal reception condition, such as signal to noise ratio. According to another aspect, a wireless communications system determines a communications constraint associated with a terminal. The system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal based on the determined communications constraint. Preferably, the system assigns a time slot, a spreading code, a coding rate and a bandwidth to the terminal such that at least one of an available bandwidth, a number of available time slots, and a number of available spreading codes is optimized. Related apparatus are also described.

摘要翻译： 一种无线通信系统，包括至少一个基站，可操作以与在其上定义的重复时隙中的多个载波频率上的终端进行通信，通过将时隙的全部时隙或扩展码定义的子信道分配给终端来进行操作 关于与终端相关联的通信约束。 通信约束可以包括诸如信息速率或错误率的性能要求，以及诸如信噪比的信号接收条件。 根据另一方面，无线通信系统确定与终端相关联的通信约束。 系统基于所确定的通信约束向终端分配时隙，扩展码，编码率和带宽。 优选地，系统向终端分配时隙，扩展码，编码率和带宽，使得可用带宽，可用时隙的数量和可用扩展码的数量中的至少一个被优化。 还描述了相关装置。

公开(公告)号：US5838267A

公开(公告)日：1998-11-17

申请号：US728158

申请日：1996-10-09

申请人： Yi-Pin Eric Wang ,  Sandeep Chennakeshu ,  Paul W. Dent ,  Kumar Balachandran

发明人： Yi-Pin Eric Wang ,  Sandeep Chennakeshu ,  Paul W. Dent ,  Kumar Balachandran

IPC分类号： H03M13/37 ,  G06F11/10 ,  H03M13/00 ,  H03M13/29 ,  H04L1/00 ,  H04L1/06 ,  H04L1/18 ,  G06F11/00

CPC分类号： H04L1/0057 ,  H03M13/00 ,  H03M13/2927 ,  H03M13/293 ,  H03M13/2942 ,  H03M13/3769 ,  H04L1/06 ,  H03M13/1505 ,  H03M13/6306 ,  H04L1/0071

摘要： A method for encoding and decoding the digital information sequence uses a combination of two block codes to simultaneously correct and detect errors. The information sequence is encoded by a first stage of the encoder to produce an information code word including an information vector and a primary redundancy vector. The primary redundancy vector is encoded in a second stage of the encoder to obtain a redundancy code word. The information code word and redundancy code word are interleaved and transmitted to the receiver. At the receiver, the information code word and redundancy code word are decoded in a first stage of the decoder to obtain a first estimate of the information code word. The first estimate of the information code word is decoded in the second stage of the decoder to produce a second estimate of the information code word. The distance between the first and second estimates of the information code word is evaluated. If the distance is more than one, the received code word is erased. In another embodiment, the information sequence is repeated at the receiver. Each repetition includes a parity check resulting from the same code or from different codes. The received information vectors are selectively combined and then individually decoded using the individual parity vectors to generate multiple estimates of the information sequence. The estimates are then combined using hard or soft combining techniques.

摘要翻译： 用于对数字信息序列进行编码和解码的方法使用两个块码的组合来同时校正和检测错误。 信息序列由编码器的第一级编码，以产生包括信息向量和主冗余向量的信息码字。 主冗余矢量被编码在编码器的第二级以获得冗余码字。 信息码字和冗余码字被交织并发送到接收机。 在接收机处，信息码字和冗余码字在解码器的第一级解码，以获得信息码字的第一估计。 在解码器的第二级解码信息码字的第一估计，以产生信息码字的第二估计。 评估信息码字的第一和第二估计之间的距离。 如果距离大于1，则接收到的代码字被擦除。 在另一个实施例中，在接收器处重复信息序列。 每个重复都包括由相同代码或不同代码产生的奇偶校验。 选择性地组合所接收的信息向量，然后使用各个奇偶校验向量单独解码以生成信息序列的多个估计。 然后使用硬或软组合技术组合估计值。

公开(公告)号：US07440489B2

公开(公告)日：2008-10-21

申请号：US09923374

申请日：2001-08-07

申请人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

发明人： Erik Dahlman ,  Yi-Pin Eric Wang ,  Paul W. Dent ,  Gregory E. Bottomley ,  Ali Khayrallah ,  Christer Östberg

IPC分类号： H04K1/00 ,  H04B15/00 ,  H04L27/30

CPC分类号： H04B1/7115 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/712 ,  H04B2201/7071 ,  H04B2201/709727

摘要： A spread spectrum signal is processed by correlating the spread spectrum signal with a spreading sequence at a first plurality of correlation times to produce a first plurality of time-offset correlations. The first plurality of time-offset correlations is processed to produce a first symbol representation for a symbol. A first quality is determined for the first symbol representation. Responsive to the determined first quality, it is determined whether to further process the first symbol representation or to process a second symbol representation for the symbol generated from the spread spectrum signal. The first quality may be determined, for example, by decoding the first symbol representations to generate a decoding metric or error check indicator, such as a CRC result. The symbol representations may be generated and/or evaluated for quality in a serial fashion or a parallel fashion.

摘要翻译： 通过在第一多个相关时间将扩展频谱信号与扩频序列相关来处理扩展频谱信号，以产生第一多个时间偏移相关。 处理第一多个时间偏移相关以产生符号的第一符号表示。 确定第一个符号表示的第一个质量。 响应于确定的第一质量，确定是否进一步处理第一符号表示或处理从扩频信号产生的符号的第二符号表示。 可以例如通过对第一符号表示进行解码以产生诸如CRC结果的解码度量或错误检查指示符来确定第一质量。 符号表示可以以串行方式或并行方式生成和/或评估质量。

公开(公告)号：US09559768B2

公开(公告)日：2017-01-31

申请号：US12034283

申请日：2008-02-20

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04B7/185

CPC分类号： H04B7/18526

摘要： A satellite broadcasts radio programs to mobile and fixed receivers at various locations. Ground stations supplement the satellite broadcasts in areas where the satellite signal may be shadowed. Likewise, the satellite signal supplements the terrestrial transmissions in areas with marginal terrestrial signal strength. Ground stations and a satellite transmit the same digital symbol stream over a same frequency spectrum. The symbol streams arrive in each service area of the ground stations with a relative delay that is within a window for which a receiver is adapted to decode efficiently. Spectral efficiency is achieved by allowing the ground stations to share the same frequencies as the satellites.

摘要翻译： 卫星向各种地点的移动和固定接收机广播无线电节目。 地面站补充卫星信号可能被遮蔽的地区的卫星广播。 同样，卫星信号补充地面信号强度较低的地区的地面传输。 地面站和卫星在同一频谱上发送相同的数字符号流。 符号流在地面站的每个服务区域中到达接收机适于对其进行有效解码的相对延迟。 通过允许地面站与卫星共享相同的频率来实现光谱效率。

公开(公告)号：US08259845B2

公开(公告)日：2012-09-04

申请号：US12126576

申请日：2008-05-23

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L25/03

CPC分类号： H04L25/03834 ,  H04L25/03821 ,  H04L25/0384 ,  H04L25/03859 ,  H04L27/2626 ,  H04L27/2647

摘要： A communication system (20) comprises a transmitter (22) and a receiver (24). The transmitter (22) comprises a source of information symbols (30); a pulse shaping wave function generator (32); and a combiner (34) configured to express the information symbols received from the source as signals which are shaped in time and frequency domains by the wave function. The pulse shaping wave function generator (32) is configured to provide a wave function which has the Nyquist property and has a same shape as its own Fourier transform. The combiner (34) is configured to combine the wave function with a stream of digital data symbols to produce a filtered stream for transmission by the transmitter.

摘要翻译： 通信系统（20）包括发射机（22）和接收机（24）。 发射机（22）包括信息符号源（30）; 脉冲整形波函数发生器（32）; 以及组合器（34），被配置为将从源接收的信息符号表示为通过波函数在时域和频域中成形的信号。 脉冲整形波函数发生器（32）被配置为提供具有奈奎斯特性质并且具有与其自身傅里叶变换相同形状的波函数。 组合器（34）被配置为将波函数与数字数据符号流组合以产生经过滤波以供发射机传输。

公开(公告)号：US20110150049A1

公开(公告)日：2011-06-23

申请号：US12645856

申请日：2009-12-23

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/28 ,  H04B1/38

CPC分类号： H04L5/0053 ,  H04L5/0048 ,  H04L5/0057

摘要： A method and apparatus for efficiently providing a large volume of channel feedback, e.g., for OFDM MISO and MIMO systems, is described herein. To that end, a mapping unit in an OFDM transceiver maps channel feedback values, e.g., received reference signal values or channel estimates derived therefrom, on a one-to-one basis to individual transmission subchannels. More particularly, the mapping unit maps a feedback value, e.g., the received reference value or a channel estimate derived therefrom, to a single transmission subchannel of an outgoing OFDM signal. For example, the mapping unit may map the feedback value to an input of a frequency transform unit, such as an inverse discrete Fourier transform unit, to map the feedback value to a single transmission subchannel comprising an OFDM transmission subcarrier. The OFDM transceiver transmits the outgoing OFDM signal to the remote transceiver to provide the feedback value to the remote transceiver.

摘要翻译： 本文描述了用于有效地提供大量信道反馈的方法和装置，例如用于OFDM MISO和MIMO系统。 为此，OFDM收发器中的映射单元将信道反馈值（例如，接收到的参考信号值或从其导出的信道估计）一一对应地映射到各个传输子信道。 更具体地，映射单元将例如所接收的参考值或其导出的信道估计的反馈值映射到输出OFDM信号的单个传输子信道。 例如，映射单元可以将反馈值映射到诸如逆离散傅立叶变换单元的频率变换单元的输入，以将反馈值映射到包括OFDM发送子载波的单个发送子信道。 OFDM收发器将输出的OFDM信号发送到远程收发器以向远程收发器提供反馈值。

公开(公告)号：US20080291821A1

公开(公告)日：2008-11-27

申请号：US11929268

申请日：2007-10-30

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04J11/00 ,  H04B7/216

CPC分类号： H04J13/10 ,  H04B1/7097 ,  H04B2201/709709

摘要： The technology in this application solves these problems (and others) and meets the desirable goals identified above (and others). The technology spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.

摘要翻译： 在这个应用中的技术解决了这些问题（和其他），并满足了上述（和其他）所确定的理想目标。 该技术在可用的不连续频谱（例如射频频带）上传播信号，使得扩展信号仅占据非连续频谱。 以这种方式，CDMA发送和接收可以用于分段或不连续的光谱，否则不能用于直接序列扩展。 优选地在频谱的非连续部分上扩展，而不会在位于允许频谱之间的不可用频谱的部分中产生不可接受的干扰。 通过避免位于允许频谱之间的部分不可用频谱中的不可接受的干扰，不可用频谱可被其他用户或服务使用。

公开(公告)号：US07184492B2

公开(公告)日：2007-02-27

申请号：US10361244

申请日：2003-02-10

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L27/04

CPC分类号： H04B7/0671 ,  H04B7/0408 ,  H04B7/0617 ,  H04B7/0695

摘要： The invention comprises using beamforming antenna to coherently transmit an information signal to a receiver using two or more directional beams. In one embodiment, the phase and timing of the information signals carried by each directional beams are adjusted such that the signals arrive synchronously at the mobile terminal. Time synchronization may be obtained by delaying signals transmitted on selected directional beams to compensate for different propagation delays, or by preconditioning and filtering the signals using a channel coefficient matrix.

摘要翻译： 本发明包括使用波束形成天线使用两个或更多个定向波束将信息信号相干地发射到接收机。 在一个实施例中，调整每个定向波束所携带的信息信号的相位和定时，使得信号在移动终端同步到达。 可以通过延迟在所选定向波束上传输的信号来补偿不同的传播延迟，或通过使用信道系数矩阵预处理和滤波信号来获得时间同步。

公开(公告)号：US07155229B2

公开(公告)日：2006-12-26

申请号：US10041251

申请日：2002-01-08

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04Q7/20

CPC分类号： H04W16/32 ,  H04B1/715 ,  H04B2001/7154 ,  H04W36/18 ,  H04W88/085

摘要： A mobile communication system comprises a plurality of cells, with each cell including a network of microstations distributed more or less uniformly throughout the cell. A central controller connected to the network of microstations selects a group of microstations in the vicinity of the mobile terminal to transmit information to the mobile terminal. The selected microstations in the active set for a given mobile terminal is continuously updated as the mobile terminal moves through the network of microstations to form a virtual cell that follows the mobile terminal through the network. Transmission conflicts between two mobile terminals is avoided by inhibiting transmissions from an active microstation to at least one of the co-channel mobile terminals when a transmission conflict is detected.

公开(公告)号：US07027454B2

公开(公告)日：2006-04-11

申请号：US10007244

申请日：2001-11-13

申请人： Paul W. Dent

发明人： Paul W. Dent

IPC分类号： H04L12/28

CPC分类号： H01Q3/40 ,  H01Q21/061 ,  H01Q25/00

摘要： A transmitter is provided for simultaneously transmitting a plurality of signals in a plurality of directive beams to corresponding destination stations, each destination station located in a separate fan within a service area. The transmitter includes a plurality of beamformers, each beamformer receiving one of the signals to be transmitted to an associated fan, each of the beamformers having a plurality of outputs for each different signal to be transmitted. A plurality of Butler matrices each receive one of the plurality of outputs from the plurality of beamformers for each different signal to be transmitted, each Butler matrix having a plurality of outputs in phased relationship to one another, wherein each of the signals to be transmitted is simultaneously provided across the outputs of each Butler matrix in a phased relationship. An antenna is provided with an aperture within which a two-dimensional array of antenna elements are disposed, wherein equal fractions of adjacent antenna elements are connected to the outputs of each Butler matrix, and wherein each of the plurality of signals are simultaneously transmitted by the entire two-dimensional array of antenna elements. Each of the plurality of beamformers receives steering control signals for steering the direction of each beam within its respective fan.