公开(公告)号：US07751492B2

公开(公告)日：2010-07-06

申请号：US11165451

申请日：2005-06-23

申请人： Ahmad Jalali ,  Jay Rodney Walton

发明人： Ahmad Jalali ,  Jay Rodney Walton

IPC分类号： H04B7/02

CPC分类号： H04L5/023

摘要： For certain embodiments of this application, a method and apparatus for generating pilots in a wireless multiple-input multiple output (MIMO) communication system is disclosed. The certain embodiments can include obtaining at least one pilot symbol for each antenna of a plurality of antennas, obtaining an orthogonal sequence for each antenna in the plurality of antennas, and covering the at least one pilot symbol for each antenna with the orthogonal sequence to obtain a sequence of covered pilot symbols for each antenna to obtain at least one covered pilot symbols for each of the plurality of antennas.

摘要翻译： 对于本申请的某些实施例，公开了一种用于在无线多输入多输出（MIMO）通信系统中生成导频的方法和装置。 某些实施例可以包括为多个天线中的每个天线获得至少一个导频符号，为多个天线中的每个天线获得正交序列，并用正交序列覆盖每个天线的至少一个导频符号，以获得 用于每个天线的覆盖导频符号的序列，以获得用于所述多个天线中的每一个的至少一个被覆盖的导频符号。

公开(公告)号：US20100142638A1

公开(公告)日：2010-06-10

申请号：US12704111

申请日：2010-02-11

申请人： Ahmad Jalali ,  Jay R. Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay R. Walton ,  Mark Wallace

IPC分类号： H04L27/28

CPC分类号： H04L5/023

摘要： Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).

摘要翻译： 发射机和接收机单元，用于OFDM通信系统并可配置为支持多种类型的业务。 发射机单元包括一个或多个编码器，符号映射元件和调制器。 每个编码器接收和编码相应的信道数据流以生成对应的编码数据流。 符号映射元件接收并映射来自编码数据流的数据以产生调制符号向量，其中每个调制符号向量包括用于调制一组音调以生成OFDM符号的一组数据值。 调制器调制调制符号向量以提供适于传输的调制信号。 来自每个编码数据流的数据被映射到一个或多个“电路”的相应集合。 每个电路可以被定义为包括来自多个OFDM符号的多个音调，来自单个OFDM符号的多个音调，来自一个或多个OFDM符号的所有音调，或一些其它音调组合。 电路可以具有相同的尺寸或不同的尺寸。 不同的电路可以用于全速率数据（例如，活动语音）和低速率数据（例如，静默时段）。

公开(公告)号：US07633895B2

公开(公告)日：2009-12-15

申请号：US10428953

申请日：2003-05-01

申请人： Leonard N. Schiff ,  Ahmad Jalali

发明人： Leonard N. Schiff ,  Ahmad Jalali

IPC分类号： H04B7/212

CPC分类号： H04B7/216 ,  H04B7/18543 ,  H04B2201/70702 ,  Y02D70/446

摘要： Orthogonal CDMA (OCDMA) in the return link of a satellite based communications system provides improved bandwidth efficiencies; increased ability to overcome channel degrading phenomenon; reduced transmission power; or various combinations thereof. By achieving code synchronization needed for advantageous use of OCDMA in the return link of a satellite based communication system, a plurality of terminals, each with a unique time slot/code channel assignment, may transmit concurrently, with the same, or lower, aggregate power as would be used by a single terminal using TDMA. Use of OCDMA in the return link allows one or more terminals, each in a common beam and assigned a common time slot, to transmit at a higher transmission power to overcome channel degradation effects. The ability to allow for higher transmission power for a particular terminal can increase the effective data rate for that terminal by enabling the use of a higher order modulation technique.

摘要翻译： 基于卫星通信系统的返回链路中的正交CDMA（OCDMA）提供了改进的带宽效率; 增强克服渠道退化现象的能力; 降低发射功率; 或其各种组合。 通过实现在基于卫星的通信系统的返回链路中有利地使用OCDMA所需的代码同步，每个具有唯一的时隙/码信道分配的终端可以以相同或更低的总功率同时发送 如将由使用TDMA的单个终端使用的那样。 在返回链路中使用OCDMA允许一个或多个终端，每个在公共波束中并且分配公共时隙，以更高的发射功率发射以克服信道劣化效应。 允许特定终端的较高发射功率的能力可以通过使用更高阶调制技术来增加该终端的有效数据速率。

公开(公告)号：US07333560B2

公开(公告)日：2008-02-19

申请号：US11328807

申请日：2006-01-09

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04K1/02

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

摘要翻译： 在时分双工（TDD）通信系统中处理用于传输的数据的技术。 在一个方面，基于来自终端的反向链路传输（例如，导频）在基站处估计前向链路的频率响应。 在前向链路上的数据传输之前，基站基于终端发送的导频来确定反向传递函数，使用校准函数“校准”反向传递函数，以导出前向传递函数的估计，以及前提条件 基于从前向传递函数导出的权重的调制符号。 在另一方面，终端估计前向链路的“质量”，并将该信息提供给基站。 然后，基站使用该信息在发送之前对数据进行适当的编码和调制，使得所发送的数据能够以期望的性能水平由终端接收。

公开(公告)号：US20080025249A1

公开(公告)日：2008-01-31

申请号：US11829869

申请日：2007-07-27

申请人： Kalyan Kuppuswamy ,  June Namgoong ,  Srikant Jayaraman ,  Ahmad Jalali

发明人： Kalyan Kuppuswamy ,  June Namgoong ,  Srikant Jayaraman ,  Ahmad Jalali

IPC分类号： H04B7/204

CPC分类号： H04B7/18567

摘要： A communication system is provided that allows a mobile terminal with an EVDO interface to perform VoIP communications via a satellite. The 1xEVDO physical layer frames and vocoder frames are synchronized and aligned to a known periodic time boundary for efficient transmission. A reverse link transmission rate is adjusted to match a VoIP packet source rate and operate the reverse link transmission channel to a satellite continuously. The reverse link transmission channel from a mobile terminal to a satellite may operate continuously and at a lower channel transmission rate to reduce the peak power amplifier power requirement. The higher layer time-out periods are increased to account for propagation delay to/from a satellite relay. A physical layer retransmit mechanism is disabled to ignore ACKs/NACKs when sending VoIP packets via a satellite relay. A different channel code may be selective applied depending on the size/type of packets being transmitted.

摘要翻译： 提供一种通信系统，其允许具有EVDO接口的移动终端经由卫星执行VoIP通信。 1xEVDO物理层帧和声码器帧被同步并对齐到已知的周期时间边界以进行有效传输。 调整反向链路传输速率以匹配VoIP分组源速率并且连续地向卫星操作反向链路传输信道。 从移动终端到卫星的反向链路传输信道可以连续地以较低的信道传输速率工作，以降低峰值功率放大器的功率需求。 更高层的超时周期被增加以考虑到/从卫星中继的传播延迟。 当通过卫星中继发送VoIP分组时，物理层重传机制被禁止忽略ACK / NACK。 根据发送的分组的大小/类型，可以选择性地应用不同的信道码。

公开(公告)号：US20080001812A1

公开(公告)日：2008-01-03

申请号：US11555859

申请日：2006-11-02

申请人： Ahmad Jalali

发明人： Ahmad Jalali

IPC分类号： H04B7/185

CPC分类号： H04B7/2041 ,  H04B7/0408

摘要： A satellite communication system designed to communicate with wireless communication devices (WCDs) by use of a mosaic pattern of signal beams uses multiple beams to augment the communication with individual WCDs. In addition to communication with a WCD through a primary beam for that WCD, adjacent beams are used, but with signals utilizing circuit parameters assigned to the primary beam. The signals from a given WCD are relayed in a backhaul, either as an aggregate signal processed by the satellite, or as backhaul communication signals to be combined or separated on the ground.

摘要翻译： 设计为通过使用信号束的马赛克图案与无线通信设备（WCD）通信的卫星通信系统使用多个波束来增强与各个WCD的通信。 除了通过用于该WCD的主波束与WCD的通信之外，还使用相邻的波束，但是使用分配给主波束的电路参数的信号。 来自给定WCD的信号在作为由卫星处理的聚合信号的回程中进行中继，或作为在地面上组合或分离的回程通信信号。

公开(公告)号：US20060093067A1

公开(公告)日：2006-05-04

申请号：US11298639

申请日：2005-12-08

申请人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

IPC分类号： H04B7/06 ,  H04K1/10

CPC分类号： H04L5/023

摘要： Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).

公开(公告)号：US07012883B2

公开(公告)日：2006-03-14

申请号：US09991039

申请日：2001-11-21

申请人： Ahmad Jalali ,  Ivan Jesus Fernandez Corbaton

发明人： Ahmad Jalali ,  Ivan Jesus Fernandez Corbaton

IPC分类号： H04J11/00

CPC分类号： H04L5/006 ,  H04L1/0002 ,  H04L1/0021 ,  H04L1/0023 ,  H04L1/1819 ,  H04L5/0007 ,  H04L5/0046 ,  Y02D50/10

摘要： Techniques to determine the rate for a data transmission in an OFDM system. The maximum data rate that may be reliably transmitted over a given multipath (non-flat) channel by the OFDM system is determined based on a metric for an equivalent (flat) channel. For the given multipath channel and a particular rate (which may be indicative of a particular data rate, modulation scheme, and coding rate), the metric is initially derived from an equivalent data rate and the particular modulation scheme. A threshold SNR needed to reliably transmit the particular data rate using the particular modulation scheme and coding rate is then determined. The particular rate is deemed as being supported by the multipath channel if the metric is greater than or equal to the threshold SNR. Incremental transmission is used to account for errors in the determined data rate.

公开(公告)号：US06888805B2

公开(公告)日：2005-05-03

申请号：US09816558

申请日：2001-03-23

申请人： Paul Bender ,  Ahmad Jalali ,  Bruce Judson ,  Roberto Padovani ,  Charles E. Wheatley, III

发明人： Paul Bender ,  Ahmad Jalali ,  Bruce Judson ,  Roberto Padovani ,  Charles E. Wheatley, III

IPC分类号： H04B7/26 ,  H04J3/00 ,  H04W16/02 ,  H04W16/12 ,  H04Q7/00 ,  H04B7/216 ,  H04Q7/20

CPC分类号： H04W16/12 ,  H04B7/2618 ,  H04W16/02

摘要： A “time multiplexed” transmission scheme capable of reducing the amount of interference from other cells operated at the same frequency band. Each cell in a system transmits in designated time intervals (e.g., time slots) during which other interfering cells may be prevented from transmitting. By temporarily “blanking” transmissions from interfering cells during the designated time slots, the amount of interference from these cells is reduced. The improved signal quality may support transmission at a desired or higher data rate, which may not be possible without cell blanking. In one variant, transmissions from the cells are staggered over different time slots. A set of one or more cells may be designated to transmit in each of a number of slot phases. The cells transmit in a staggered manner on these phases to reduce interference. The transmission scheme may be used for a various channel types (e.g., a control channel) and applications.

摘要翻译： “时分复用”传输方案能够减少在相同频带上工作的其他小区的干扰量。 系统中的每个小区以指定的时间间隔（例如，时隙）发送，在该时间间隔期间可以防止其他干扰小区的发射。 通过在指定时隙期间暂时从干扰小区“消隐”传输，减少了来自这些小区的干扰量。 改进的信号质量可以支持以期望的或更高数据速率的传输，这在没有小区消隐的情况下可能是不可能的。 在一个变型中，来自小区的传输在不同的时隙上交错。 可以指定一组一个或多个小区在多个时隙相位中的每一个中进行发送。 小区在这些相位上以交错的方式发送以减少干扰。 传输方案可以用于各种信道类型（例如，控制信道）和应用。

公开(公告)号：US06778507B1

公开(公告)日：2004-08-17

申请号：US09388267

申请日：1999-09-01

申请人： Ahmad Jalali

发明人： Ahmad Jalali

IPC分类号： H04B700

CPC分类号： H04B7/0617 ,  H04B7/0632

摘要： In a CDMA data communication system capable of variable rate transmission, utilization of beamforming techniques decreases the average interference caused by transmissions of a base station to subscriber stations in neighboring cells. Base stations utilize multiple transmit antennas, each transmitting signals at controlled phases, to form transmit signal beams corresponding to individual subscriber stations. Data and reference signals are transmitted along beams that change according to fixed time slots and sub-slots in order to maximize carrier-to-interference ratios (C/I) measured at subscriber stations.

摘要翻译： 在能够进行可变速率传输的CDMA数据通信系统中，波束成形技术的利用减少了基站对相邻小区中的用户站的传输所造成的平均干扰。 基站利用多个发射天线，每个发射天线以受控的相位传输信号，以形成对应于各个用户台的发射信号波束。 数据和参考信号沿着根据固定时隙和子时隙而变化的波束发送，以便最大化在用户台测量的载波干扰比（C / I）。