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    Method and apparatus for varying lengths of low density party check codewords
    1.
    发明授权
    Method and apparatus for varying lengths of low density party check codewords 有权
    用于改变低密度派对检查码字长度的方法和装置

    公开(公告)号：US07263651B2

    公开(公告)日：2007-08-28

    申请号：US10815311

    申请日：2004-03-31

    申请人： Bo Xia ,  Eric A. Jacobsen

    发明人： Bo Xia ,  Eric A. Jacobsen

    IPC分类号： H03M13/13 ,  H03M13/35

    CPC分类号： H04L1/0051 ,  H03M13/1114 ,  H03M13/1117 ,  H03M13/1128 ,  H03M13/3707 ,  H04L1/0057 ,  H04W84/12

    摘要： A method and apparatus for encoding/decoding information using low density parity check (LDPC) codewords of varying lengths. In one implementation, an encoder/decoder uses a parity check matrix having a size that corresponds to a length of information for each codeword. In one example, the size of the parity check matrix may be retrieved from multiple stored matrices having different sizes. In other examples, a mother code matrix may be dynamically adjusted by puncturing parity bits and/or deleting information bits. Other inventive embodiments and adaptations are also disclosed.

    摘要翻译： 一种使用不同长度的低密度奇偶校验（LDPC）码字对信息进行编码/解码的方法和装置。 在一个实现中，编码器/解码器使用具有对应于每个码字的信息长度的大小的奇偶校验矩阵。 在一个示例中，可以从具有不同大小的多个存储的矩阵中检索奇偶校验矩阵的大小。 在其他示例中，母码矩阵可以通过删截奇偶校验位和/或删除信息比特来动态地调整。 还公开了其它发明实施例和适配。

    Techniques for low density parity check for forward error correction in high-data rate transmission
    2.
    发明申请
    Techniques for low density parity check for forward error correction in high-data rate transmission 审中-公开
    高数据传输中前向纠错低密度奇偶校验技术

    公开(公告)号：US20070180344A1

    公开(公告)日：2007-08-02

    申请号：US11344036

    申请日：2006-01-31

    申请人： Eric A. Jacobsen ,  Bo Xia

    发明人： Eric A. Jacobsen ,  Bo Xia

    IPC分类号： H03M13/00

    CPC分类号： H03M13/1105 ,  H03M13/635 ,  H03M13/6513

    摘要： A system, apparatus, and method includes a decoder to decode information including a low density parity check (LDPC) codeword received at a node using entries defined in a parity check base matrix. Other embodiments are described and claimed. The system further includes an antenna.

    摘要翻译： 系统，装置和方法包括解码器，用于解码包括使用在奇偶校验基本矩阵中定义的条目在节点处接收的低密度奇偶校验（LDPC）码字的信息。 描述和要求保护其他实施例。 该系统还包括天线。

    OFDM transmitter and method for multi-user MIMO transmissions
    5.
    发明授权
    OFDM transmitter and method for multi-user MIMO transmissions 有权
    OFDM发射机和用于多用户MIMO传输的方法

    公开(公告)号：US08019010B2

    公开(公告)日：2011-09-13

    申请号：US12982161

    申请日：2010-12-30

    申请人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S Sadri

    发明人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S Sadri

    IPC分类号： H04K1/10 ,  H04L27/28

    CPC分类号： H04W16/28 ,  H04B7/0408 ,  H04L27/2602 ,  H04W74/02

    摘要： An orthogonal-frequency division multiplexed (OFDM) transmitter is configured to transmit a data unit in accordance with a multiple-input multiple-output (MIMO) technique over a wideband channel comprising a 20 MHz channel and another channel using a plurality of spatially diverse antennas. The transmitter is further configured to include in the data unit, a parameter indicating a modulation and coding scheme and a parameter indicating number of spatial streams. Each of the spatial streams is encoded and beamformed for receipt by one or more different receiving stations.

    摘要翻译： 正交频分复用（OFDM）发射机被配置为根据多输入多输出（MIMO）技术在包括20MHz信道的宽带信道和使用多个空间多样的天线的另一信道上发送数据单元 。 发射机还被配置为在数据单元中包括指示调制和编码方案的参数和指示空间流数量的参数。 每个空间流被编码并且被波束形成以便由一个或多个不同的接收站接收。

    MIMO transmitter and method for transmitting an OFDM symbol in accordance with an IEEE 802.11 communication standard over a plurality of spatial channels
    6.
    发明授权
    MIMO transmitter and method for transmitting an OFDM symbol in accordance with an IEEE 802.11 communication standard over a plurality of spatial channels 有权
    MIMO发射机和用于根据IEEE 802.11通信标准在多个空间信道上发射OFDM符号的方法

    公开(公告)号：US07822135B2

    公开(公告)日：2010-10-26

    申请号：US12482671

    申请日：2009-06-11

    申请人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S Sadri

    发明人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S Sadri

    IPC分类号： H04K1/10 ,  H04L27/28

    CPC分类号： H04W16/28 ,  H04B7/0408 ,  H04L27/2602 ,  H04W74/02

    摘要： A multiple-input-multiple output (MIMO) transmitter for transmitting an orthogonal frequency division multiplexed (OFDM) symbol over a plurality of spatial channels using a plurality of antennas is described. The transmitter includes encoding circuitry to encode blocks of input bits in accordance with a variable encoding rate to generate blocks of encoded bits and a spatial-frequency parser to parse the blocks of encoded bits into spatial-frequency groups. The transmitter also includes subcarrier modulators to modulate each spatial-frequency group of encoded bits on one of the OFDM subcarriers to generate symbol-modulated subcarriers. Spatial-frequency groups having a greater number of encoded bits are modulated at higher-order modulation levels and spatial-frequency groups having a lesser number of encoded bits are modulated at lower-order modulation orders.

    摘要翻译： 描述了使用多个天线在多个空间信道上发送正交频分复用（OFDM）符号的多输入多输出（MIMO）发射机。 发射机包括编码电路，用于根据可变编码速率对输入比特块进行编码以产生编码比特块和空间频率解析器，以将编码比特的块解析为空间频率组。 发射机还包括子载波调制器，以调制OFDM子载波之一上的编码比特的每个空间频率组，以产生符号调制的副载波。 具有更多数量的编码比特的空间频率组在高阶调制级别被调制，并且具有较少编码比特数的空间频率组以低阶调制阶调制。

    MIMO TRANSMITTER AND METHOD FOR TRANSMITTING A GROUP OF SEQUENTIAL OFDM SYMBOLS IN ACCORDANCE WITH AN IEEE 802.16 COMMUNICATION STANDARD
    7.
    发明申请
    MIMO TRANSMITTER AND METHOD FOR TRANSMITTING A GROUP OF SEQUENTIAL OFDM SYMBOLS IN ACCORDANCE WITH AN IEEE 802.16 COMMUNICATION STANDARD 有权
    用于根据IEEE 802.16通信标准发送一组顺序OFDM符号的MIMO发射机和方法

    公开(公告)号：US20090245405A1

    公开(公告)日：2009-10-01

    申请号：US12482689

    申请日：2009-06-11

    申请人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S. Sadri

    发明人： John S. Sadowsky ,  Minnie Ho ,  Sumeet Sandhu ,  Alexander A. Maltsev ,  Eric A. Jacobsen ,  Ali S. Sadri

    IPC分类号： H04K1/10 ,  H04J11/00 ,  H04L5/14

    CPC分类号： H04W16/28 ,  H04B7/0408 ,  H04L27/2602 ,  H04W74/02

    摘要： A multiple-input-multiple output (MIMO) transmitter for transmitting a group of sequential orthogonal frequency division multiplexed (OFDM) symbols on a time-division duplexed (TDD) channel in accordance with an IEEE 802.16 standard using a plurality of antennas. The MIMO transmitter comprises a spatial-frequency parser to parse a block of bits into spatial-frequency blocks of a variable number of coded bits, and subcarrier modulators to individually modulate OFDM subcarriers with the spatial-frequency blocks in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers. The TDD channel comprises a plurality of the groups of the OFDM subcarriers, and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments.

    摘要翻译： 一种多输入多输出（MIMO）发射机，用于使用多个天线根据IEEE 802.16标准在时分双工（TDD）信道上发送一组顺序正交频分复用（OFDM）符号。 MIMO发射机包括用于将比特块解析成可变数量的编码比特的空间频率块的空间频率解析器，以及根据空间频率副载波调制单独调制具有空间频率块的OFDM子载波的子载波调制器 用于生成符号调制子载波组的分配。 TDD信道包括多个OFDM子载波组，并且每个子载波组内的OFDM子载波和每个顺序的OFDM符号组内的OFDM子载波具有相同的空间频率副载波调制分配。

    Channel adaptation using variable sounding signal rates
    8.
    发明授权
    Channel adaptation using variable sounding signal rates 有权
    使用可变探测信号频率的信道适配

    公开(公告)号：US07280804B2

    公开(公告)日：2007-10-09

    申请号：US10769414

    申请日：2004-01-30

    申请人： Eric A. Jacobsen ,  Shahrnaz Azizi

    发明人： Eric A. Jacobsen ,  Shahrnaz Azizi

    IPC分类号： H04B17/00

    CPC分类号： H04L1/20 ,  H04L1/0001 ,  H04L25/0216 ,  H04L25/0226 ,  H04L27/2613

    摘要： Systems, devices and methods for updating link adaptations in multi-carrier modulated signals between an access point (AP) and a wireless local area network (WLAN) station (STA) include (are configured for) periodically transmitting a channel sounding signal from the AP. The STA receives each unsolicited channel sounding signal and evaluates the current channel conditions between the AP and STA. The AP adjusts a rate of transmission of the channel sounding signals in accordance with the channel coherence time so that the channel estimates performed by the STA will be valid within the time varying characteristics of the channel. Depending on the length of the coherence time for network environment, the channel sounding signals may be AP beacons, low overhead signal fragments with no payload, or a combination of both.

    摘要翻译： 用于更新在接入点（AP）和无线局域网（WLAN）站（STA）之间的多载波调制信号中的链路自适应的系统，设备和方法包括（被配置用于）周期性地从AP接收信道探测信号 。 STA接收每个未经请求的信道探测信号，并评估AP和STA之间的当前信道状况。 AP根据信道相干时间调整信道探测信号的传输速率，使得由STA执行的信道估计将在信道的时变特性内有效。 根据网络环境的相干时间的长度，信道探测信号可以是AP信标，没有有效负载的低开销信号片段或两者的组合。

    Sparse channel estimation for orthogonal frequency division multiplexed signals
    9.
    发明授权
    Sparse channel estimation for orthogonal frequency division multiplexed signals 有权
    正交频分复用信号的稀疏信道估计

    公开(公告)号：US07230911B2

    公开(公告)日：2007-06-12

    申请号：US09852376

    申请日：2001-05-10

    申请人： Eric A. Jacobsen

    发明人： Eric A. Jacobsen

    IPC分类号： H04J11/00

    CPC分类号： H04L25/0234 ,  H04L27/2647

    摘要： A computationally efficient channel estimation technique for use within an orthogonal frequency division multiplexing (OFDM) communication system determines coefficients of a channel transfer function by calculating the dot products of a pilot vector and a plurality of interpolation vectors. One dot product is preferably calculated for each subcarrier of interest within the system. The pilot vector is extracted from an OFDM symbol received from a communication channel. In a preferred approach, a number of interpolation vectors are precalculated and stored within a communication device for subsequent use during channel estimation and equalization operations. The technique is highly flexible and can be implemented using, for example, a variable user block size or a variable pilot vector size.

    摘要翻译： 在正交频分复用（OFDM）通信系统中使用的计算有效的信道估计技术通过计算导频矢量和多个插值向量的点积来确定信道传递函数的系数。 对于系统内的感兴趣的每个子载波，优选地计算一个点积。 从从通信信道接收的OFDM符号中提取导频向量。 在优选的方法中，预先计算多个内插向量并将其存储在通信设备中，以便在信道估计和均衡操作期间随后使用。 该技术是高度灵活的，并且可以使用例如可变用户块大小或可变导频矢量大小来实现。

    Method and apparatus to support scalability in a multicarrier network
    10.
    发明授权
    Method and apparatus to support scalability in a multicarrier network 失效
    支持多载波网络中的可扩展性的方法和装置

    公开(公告)号：US08411774B2

    公开(公告)日：2013-04-02

    申请号：US13230330

    申请日：2011-09-12

    申请人： Eric A. Jacobsen ,  Jeff Foerster ,  Dan Dahle

    发明人： Eric A. Jacobsen ,  Jeff Foerster ,  Dan Dahle

    IPC分类号： H04L27/28

    CPC分类号： H04L27/2602 ,  H04L5/023 ,  H04L27/2608

    摘要： A multicarrier communication device using orthogonal frequency division multiplexing (OFDM) symbols can vary the number of subcarriers being used on multicarrier communication within a network, based on a predetermined criterion and capability information. The capability information can include a data file, which indicates portions of an electromagnetic spectrum for which regulatory body licenses are currently obtained for a network cell. Alternatively, the capability information can include capability information about the wireless devices in communication with the multicarrier communication device, where the capability information for each wireless device includes device power limitations, device bandwidth width limitations, or which subcarriers a wireless device is capable of using.

    摘要翻译： 使用正交频分复用（OFDM）符号的多载波通信设备可以基于预定标准和能力信息来改变在网络内的多载波通信上使用的子载波的数量。 能力信息可以包括数据文件，其指示当前为网络小区获得监管机构许可证的电磁频谱的部分。 或者，能力信息可以包括关于与多载波通信设备通信的无线设备的能力信息，其中每个无线设备的能力信息包括设备功率限制，设备带宽宽度限制，或无线设备能够使用哪些子载波。