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    Method and apparatus for orthogonally overlaying variable chip rate spread spectrum signals
    71.
    发明授权
    Method and apparatus for orthogonally overlaying variable chip rate spread spectrum signals 有权
    用于正交叠加可变码片速率扩频信号的方法和装置

    公开(公告)号：US07505440B2

    公开(公告)日：2009-03-17

    申请号：US12009275

    申请日：2008-01-17

    申请人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

    发明人： Feng-Wen Sun ,  Lin-Nan Lee ,  Khalid Karimullah

    IPC分类号： H04B7/216 ,  H04B1/02 ,  H04J11/00 ,  H04J13/00 ,  H04Q7/00

    CPC分类号： H04B1/707 ,  H04J13/0048 ,  H04J13/18 ,  H04W52/26

    摘要： A system and method for transmitting wideband signals via a radio communication system adapted for transmitting narrow-band signals is described. A base station is used to transmit and receive a plurality of relatively narrow-band and a plurality of relatively wideband signals. The electromagnetic spectrum available to the plurality of narrow-band signals is selectively shared with the electromagnetic spectrum available to the wideband signals by systematically separating the orthogonal codes and the carrier frequencies used for transmission. The prefixes of the orthogonal codes are preferably mutually exclusive and the carrier frequencies are preferably separated by an offset. The offset may be substantially equal to an integer multiple of the narrow-band signal's chip rate. Alternatively, the offset may be substantially equal to an odd multiple of one half the narrow-band signal's chip rate in which case every other bit of the orthogonally encoded data is inverted.

    摘要翻译： 描述了经由适于发送窄带信号的无线电通信系统发送宽带信号的系统和方法。 基站用于发送和接收多个相对窄带和多个相对宽带的信号。 可用于多个窄带信号的电磁频谱通过系统地分离用于传输的正交码和载波频率，与宽带信号可用的电磁频谱选择性共享。 正交码的前缀优选地是互斥的，并且载波频率优选地被偏移分开。 偏移量可以基本上等于窄带信号的码片速率的整数倍。 或者，偏移可以基本上等于窄带信号的码片速率的一半的奇数倍，在这种情况下，正交编码数据的每隔一位被反转。

    Method and system for providing long and short block length low density parity check (LDPC) codes
    73.
    发明授权
    Method and system for providing long and short block length low density parity check (LDPC) codes 有权
    提供长和短块长度低密度奇偶校验（LDPC）码的方法和系统

    公开(公告)号：US07376883B2

    公开(公告)日：2008-05-20

    申请号：US10971509

    申请日：2004-10-22

    申请人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

    发明人： Mustafa Eroz ,  Feng-Wen Sun ,  Lin-Nan Lee

    IPC分类号： H03M13/00

    CPC分类号： H03M13/1165 ,  H03M13/1137 ,  H03M13/152 ,  H03M13/2906

    摘要： An approach is provided for generating Low Density Parity Check (LDPC) codes. An LDPC encoder generates a LDPC code with an outer Bose Chaudhuri Hocquenghem (BCH) code. For ⅓ rate, the relevant parameters are as follows: q=120, nldpc=64,800, kldpc=nBCH=21600, kBCH=21408 (12 bit error correcting BCH). For ¼ rate, the LDPC code has the following relevant parameters: q=135, nldpc=64,800, kldpc=nBCH=16200, kBCH=16008 (12 bit error correcting BCH). For ⅖ rate, the following parameters exist: q=108, nldpc=64800, kldpc=nBCH=25920, kBCH=25728 (12 bit error correcting BCH). The above approach has particular application in digital video broadcast services over satellite.

    摘要翻译： 提供了一种用于生成低密度奇偶校验（LDPC）码的方法。 LDPC编码器生成具有外部Bose Chaudhuri Hocquenghem（BCH）码的LDPC码。 对于1/3速率，相关参数如下：q = 120，n×ldcc = 64,800，k ldpc = n BCH = 21600 ，BCH = 21408（12位纠错BCH）。 对于¼速率，LDPC码具有以下相关参数：q = 135，n×ldcc = 64,800，k ldpc = n BCH = 16200 ，BCH = 16008（12位纠错BCH）。 对于2/5速率，存在以下参数：q = 108，n×ldcc = 64800，k ldpc = n BCH = 25920，k BCH = 25728（12位纠错BCH）。 上述方法在卫星数字视频广播业务中具有特殊应用。

    Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems
    74.
    发明授权
    Method and apparatus for providing carrier synchronization in digital broadcast and interactive systems 有权
    用于在数字广播和交互系统中提供载波同步的方法和装置

    公开(公告)号：US07369633B2

    公开(公告)日：2008-05-06

    申请号：US10842325

    申请日：2004-05-10

    申请人： Yimin Jiang ,  Feng-Wen Sun ,  Lin-Nan Lee ,  Neal Becker

    发明人： Yimin Jiang ,  Feng-Wen Sun ,  Lin-Nan Lee ,  Neal Becker

    IPC分类号： H04L7/00

    CPC分类号： H04L27/2272 ,  H04L7/048 ,  H04L2027/0028 ,  H04L2027/0055 ,  H04L2027/0067 ,  H04L2027/0093 ,  H04L2027/0095

    摘要： An approach is provided for supporting carrier synchronization in a digital broadcast and interactive system. A carrier synchronization module receives one or more signals representing a frame that includes one or more overhead fields (e.g., preamble and optional pilot blocks and one or multiple segments separated by pilot blocks). The module estimates carrier frequency and phase on a segment by segment basis and tracks frequency between segments. Carrier phase of the signal is estimated based upon the overhead field. Estimates carrier phase of random data field are determined based upon the estimated phase values from the overhead fields, and upon both the past and future data signals. Further, the frequency of the signal is estimated based upon the overhead fields and/or the random data field. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.

    摘要翻译： 提供了一种用于在数字广播和交互系统中支持载波同步的方法。 载波同步模块接收表示包括一个或多个开销字段（例如，前导码和可选导频块以及由导频块分隔的一个或多个片段）的帧的一个或多个信号。 该模块逐段估计载波频率和相位，并跟踪段之间的频率。 信号的载波相位基于开销字段来估计。 基于来自架空领域的估计相位值以及过去和未来数据信号来估计随机数据字段的载波相位。 此外，基于开销字段和/或随机数据字段来估计信号的频率。 上述布置特别适用于数字卫星广播和交互式系统。

    Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying(QPSK) or offset quaternary phase shift keying (OQPSK)
    75.
    发明申请
    Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying(QPSK) or offset quaternary phase shift keying (OQPSK) 有权
    用于提供与四相相移键控（QPSK）或偏移四相相移键控（OQPSK）向后兼容的更高阶调制的方法和装置，

    公开(公告)号：US20070263751A1

    公开(公告)日：2007-11-15

    申请号：US11879607

    申请日：2007-07-18

    申请人： Lin-Nan Lee ,  Feng-Wen Sun ,  Mustafa Eroz ,  Yimin Jiang

    发明人： Lin-Nan Lee ,  Feng-Wen Sun ,  Mustafa Eroz ,  Yimin Jiang

    IPC分类号： H03D3/22

    CPC分类号： H04L27/3488 ,  H04L27/183

    摘要： A method and apparatus for providing an asymmetrical backwards compatible communications signal that is capable of being decoded by QPSK and OQPSK receivers as well as PSK and QAM receivers is provided. The invention comprises a timing error accumulator coupled to a first bit stream. The first bit stream includes content that is common to the QPSK/OQPSK receiver and to the PSK/QAM receiver. A phase error accumulator is coupled to a second bit stream and adjusts the phase of symbols in the second bit stream. A phase and timing error compensator is coupled to the phase error accumulator and the timing error accumulator and adjusts the first and second bit streams received from the phase error accumulator and the timing error accumulator in order to reduce timing and phase errors. A higher order modulator coupled to the phase- and timing error compensator is also provided. The higher order modulator processes the first and second bit streams to provide the asymmetrical backwards compatible signal.

    摘要翻译： 提供一种提供能够被QPSK和OQPSK接收机以及PSK和QAM接收机解码的不对称向后兼容通信信号的方法和装置。 本发明包括耦合到第一位流的定时误差累加器。 第一比特流包括对于QPSK / OQPSK接收机和PSK / QAM接收机是共同的内容。 相位误差累加器被耦合到第二比特流并且调整第二比特流中的符号的相位。 相位和定时误差补偿器耦合到相位误差累加器和定时误差累加器，并调整从相位误差累加器和定时误差累加器接收的第一和第二比特流，以减少定时和相位误差。 还提供耦合到相位和定时误差补偿器的高阶调制器。 高阶调制器处理第一和第二比特流以提供不对称的向后兼容信号。

    Code design and implementation improvements for low density parity check codes for wireless routers using 802.11N protocol
    80.
    发明申请
    Code design and implementation improvements for low density parity check codes for wireless routers using 802.11N protocol 有权
    使用802.11N协议的无线路由器的低密度奇偶校验码的代码设计和实现改进

    公开(公告)号：US20070022352A1

    公开(公告)日：2007-01-25

    申请号：US11222084

    申请日：2005-09-08

    申请人： Mustafa Eroz ,  Lin-Nan Lee ,  Feng-Wen Sun

    发明人： Mustafa Eroz ,  Lin-Nan Lee ,  Feng-Wen Sun

    IPC分类号： H03M13/00

    CPC分类号： H04B7/06 ,  H03M13/1102 ,  H03M13/255 ,  H04B7/04 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/0606 ,  H04L1/0625 ,  H04L1/0637 ,  H04L5/0023 ,  H04L25/03898

    摘要： Method and apparatus for implementing LDPC codes in an IEEE 802.11 standard system configured to operate in a Multiple-Input, Multiple-Output (MIMO) schema. A method in accordance with the present invention comprises defining a base LDPC code, having a length equal to an integer number of data carriers in an ODFM symbol, transmitting the base LDPC code over a plurality of sub-carriers, wherein the base code is transmitted at an expected phase on sub-carriers specified by the IEEE 802.11 standard system, and transmitting the base LDPC code on other sub-carriers than those specified by the IEEE 802.11 standard system, wherein the base LDPC code on the other sub-carriers is transmit offset in phase from the base LDPC code on the specified sub-carriers.

    摘要翻译： IEEE 802.11标准系统中用于实施LDPC码的方法和装置，其被配置为在多输入多输出（MIMO）模式中操作。 根据本发明的方法包括定义具有等于ODFM符号中的整数数据载波的长度的基本LDPC码，在多个子载波上发送基本LDPC码，其中发送基本码 在由IEEE 802.11标准系统指定的子载波上的期望阶段，并且在与由IEEE 802.11标准系统指定的那些子载波之外的其他子载波上发送基本LDPC码，其中其他子载波上的基本LDPC码被发送 在指定子载波上与基本LDPC码相位偏移。