公开(公告)号：US20060088007A1

公开(公告)日：2006-04-27

申请号：US11297244

申请日：2005-12-07

申请人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

IPC分类号： H04Q7/00

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：US20060087972A1

公开(公告)日：2006-04-27

申请号：US11297853

申请日：2005-12-08

申请人： Ahmad Jalali ,  Ivan Corbaton

发明人： Ahmad Jalali ,  Ivan Corbaton

IPC分类号： H04L12/26

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：US07020073B2

公开(公告)日：2006-03-28

申请号：US10086838

申请日：2002-02-28

申请人： Tamer Kadous ,  Ahmad Jalali ,  Ivan Jesus Fernandez Corbaton

发明人： Tamer Kadous ,  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：US20060023666A1

公开(公告)日：2006-02-02

申请号：US11165451

申请日：2005-06-23

申请人： Ahmad Jalali ,  Jay Walton

发明人： Ahmad Jalali ,  Jay Walton

IPC分类号： H04Q7/00

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：US20050201335A1

公开(公告)日：2005-09-15

申请号：US10952970

申请日：2004-09-28

申请人： Ivan Fernandez-Corbaton ,  Franklin Antonio ,  Leonard Schiff ,  Ahmad Jalali

发明人： Ivan Fernandez-Corbaton ,  Franklin Antonio ,  Leonard Schiff ,  Ahmad Jalali

IPC分类号： H04W74/04 ,  H04B1/707 ,  H04Q7/00 ,  H04B7/216

CPC分类号： H04W56/0005 ,  H04J13/16

摘要： Systems, methods and apparatus for configuring and accessing a random access channel in a CDMA communication system are disclosed. The number of users supported by a random access channel can be optimized by assigning a distinct time of arrival to each of a plurality of users. Each of the users can be time synchronized and can transmit data at a time that compensates for a propagation delay to allow the data to arrive at the destination receiver at the assigned time. In a CDMA system, each of the users can transmit data that is spread with the same spreading code, provided the cross correlation properties of the code are sufficient to allow identification of a source that is time offset relative to another user. The time of arrival can be determined based on the number of active users, and can be assigned as often as each transmission by each user.

摘要翻译： 公开了用于在CDMA通信系统中配置和访问随机接入信道的系统，方法和装置。 可以通过向多个用户中的每一个分配不同的到达时间来优化随机接入信道支持的用户数量。 每个用户可以是时间同步的，并且可以在补偿传播延迟的时间发送数据，以允许数据在分配的时间到达目的地接收机。 在CDMA系统中，如果代码的互相关属性足以允许识别相对于另一个用户的时间偏移的源，那么每个用户可以发送用相同的扩展码扩展的数据。 可以基于活动用户的数量来确定到达时间，并且可以分配给每个用户每次发送的频率。

公开(公告)号：US20050190689A1

公开(公告)日：2005-09-01

申请号：US10788729

申请日：2004-02-26

申请人： Sumantra Chakravarty ,  Ahmad Jalali ,  Leonard Schiff

发明人： Sumantra Chakravarty ,  Ahmad Jalali ,  Leonard Schiff

IPC分类号： H04B1/707 ,  H04B7/14 ,  H04B7/216 ,  H04J11/00 ,  H04J13/00

CPC分类号： H04B7/216 ,  H04J13/0048 ,  H04J13/18

摘要： An OCDMA transmission arrangement involves encoding both first and second nominally orthogonal polarization signals with a same long code, and transmitting the long-encoded first and second nominally orthogonal polarization signals from respective first and second transmission sources to at least one destination. A corresponding OCDMA demodulating arrangement demodulates the first and second nominally orthogonal polarization signals that were transmitted from respective first and second transmission sources after having been encoded with the same long code. The demodulation arrangement involves receiving the encoded first and second nominally orthogonal polarization signals, and applying the same long code to the received encoded first and second nominally orthogonal polarization signals.

摘要翻译： OCDMA传输装置包括用相同的长码对第一和第二标称正交极化信号进行编码，以及将长编码的第一和第二标称正交极化信号从相应的第一和第二传输源发送到至少一个目的地。 相应的OCDMA解调装置在已经用相同的长码编码之后解调从相应的第一和第二传输源发送的第一和第二名义上正交的极化信号。 解调装置包括接收经编码的第一和第二标称正交极化信号，并将相同的长码应用于接收的编码的第一和第二标称正交极化信号。

公开(公告)号：US20050075134A1

公开(公告)日：2005-04-07

申请号：US10670078

申请日：2003-09-23

申请人： Jack Steenstra ,  Paul Jacobs ,  Ahmad Jalali

发明人： Jack Steenstra ,  Paul Jacobs ,  Ahmad Jalali

IPC分类号： H04B1/38 ,  H04M1/725 ,  H04B1/40 ,  H04M1/00

CPC分类号： H04M1/72527 ,  H04B1/3805 ,  H04M1/6058

摘要： Method and apparatus are disclosed to allow non-wireless transmission or reception of data from one device to at least another device. More particularly, in one embodiment, a jack of a first device is configured to receive incoming analog signals encoded with digital data from the second device and to transmit outgoing analog signals encoded with digital data to the second device. The first device may also comprise a first conversion unit configured to encode digital data into the outgoing analog signals and a second conversion unit configured to recover digital data from the incoming analog signals.

摘要翻译： 公开了允许从一个设备到至少另一个设备的数据的非无线传输或接收的方法和装置。 更具体地，在一个实施例中，第一设备的插座被配置为接收来自第二设备的以数字数据编码的输入模拟信号，并将输出的用数字数据编码的模拟信号发送到第二设备。 第一设备还可以包括被配置为将数字数据编码为输出模拟信号的第一转换单元和被配置为从输入的模拟信号中恢复数字数据的第二转换单元。

公开(公告)号：US06614779B1

公开(公告)日：2003-09-02

申请号：US09238443

申请日：1999-01-28

申请人： Alberto Gutierrez ,  Serge Manning ,  Ahmad Jalali

发明人： Alberto Gutierrez ,  Serge Manning ,  Ahmad Jalali

IPC分类号： H04J306

CPC分类号： H04W28/06 ,  H04B1/7075 ,  H04W48/08 ,  H04W74/0866 ,  H04W76/10 ,  H04W84/042 ,  H04W88/08

摘要： A new access channel protocol for use in cellular systems such as CDMA whereby the data transfer efficiency of an access message is increased by removing the requirement that a preamble frame and a message capsule frame have equal times of duration. With such removal, the BTS must inform listening MSs as to the time duration of the frames in each of the preamble and the message portions of the access channel time slot in addition to previously supplied information as to the number of frames in each portion. When unequal frame duration times are allowed, each portion of the access channel may be more nearly optimized to the actual time required to perform the functions of synchronization and message detection.

摘要翻译： 一种用于诸如CDMA的蜂窝系统中的新的接入信道协议，由此通过消除前导码帧和消息胶囊帧具有相同持续时间的要求来增加接入消息的数据传输效率。 通过这样的去除，除了先前提供的关于每个部分中的帧数的信息之外，BTS必须通知收听MS关于接入信道时隙的每个前导码和消息部分中的帧的持续时间。 当允许不等长的帧持续时间时，访问信道的每个部分可以更接近于执行同步和消息检测功能所需的实际时间。

公开(公告)号：US06421333B1

公开(公告)日：2002-07-16

申请号：US08954686

申请日：1997-10-20

申请人： Ahmad Jalali

发明人： Ahmad Jalali

IPC分类号： H04B7216

CPC分类号： H04L1/0059 ,  H03M13/2703 ,  H03M13/2792 ,  H04L1/0071 ,  H04L1/08 ,  H04L27/2602

摘要： A system and method that codes and interleaves data onto separate channels for transmission in a wireless multicarrier system. The multicarrier wireless transmission system has an input terminal for receiving a plurality of user data bits. The system adds error-correcting bits to the user data bits. The system then arranges and stores the combination of error-correcting bits, collectively coded symbols, in a two dimensional matrix. The system arranges the coded symbols by writing them into the matrix according to columns, from left to right. The system then retrieves the symbols from the matrix according to rows, from top to bottom. The system then transmits the retrieved symbols on different carrier frequencies such that consecutive symbols are each transmitted on a different carrier frequency.

摘要翻译： 一种在无线多载波系统中将数据编码和交织到单独信道以进行传输的系统和方法。 多载波无线传输系统具有用于接收多个用户数据位的输入端。 系统向用户数据位添加纠错位。 然后，系统将纠错位，集体编码符号的组合布置并存储在二维矩阵中。 系统根据列从左到右将它们写入矩阵中来排列编码符号。 然后，系统从上到下从行中检索矩阵中的符号。 然后，系统在不同的载波频率上发送所检索的符号，使得连续符号各自在不同的载波频率上传输。

公开(公告)号：US5828662A

公开(公告)日：1998-10-27

申请号：US666828

申请日：1996-06-19

申请人： Ahmad Jalali ,  Witold Krzymien ,  Paul Mermelstein

发明人： Ahmad Jalali ,  Witold Krzymien ,  Paul Mermelstein

IPC分类号： H04B7/26 ,  H04B7/216

CPC分类号： H04W56/0085

摘要： A synchronous discontinuous transmission medium access control (SDTX-MAC) method and apparatus for more efficiently using existing uplink channels by sharing these uplink channels between multiple terminals engaged in bursty data transmission. This is accomplished by assigning each mobile terminal an individual time slot and by not requiring each mobile terminal to broadcast its identity. This results in a reduction in the number of receivers on each base station and a reduction in the length of the synchronization message.

摘要翻译： 一种同步不连续传输介质访问控制（SDTX-MAC）方法和装置，用于通过在参与突发数据传输的多个终端之间共享这些上行链路信道来更有效地使用现有的上行链路信道。 这通过为每个移动终端分配单个时隙并且不要求每个移动终端广播其身份来实现。 这导致每个基站上的接收机的数量减少和同步消息的长度的减少。