OFDM-lite architecture for HomePlug
    31.
    发明授权
    OFDM-lite architecture for HomePlug 有权
    HomePlug的OFDM-lite架构

    公开(公告)号:US08649443B2

    公开(公告)日:2014-02-11

    申请号:US12768676

    申请日:2010-04-27

    IPC分类号: H04L25/00

    CPC分类号: H04L27/2613

    摘要: A device for communicating digital data over power lines includes a power line interface for transmitting data over at least one band of frequencies. An orthogonal frequency division multiplexing (OFDM) modulation unit generates OFDM symbols using a set of tones for the frequency band. A preamble generation unit generates preamble sequences for the frequency band by using the set of tones used by the OFDM modulation unit. The tones used by the preamble generation unit have a constant magnitude, and a set of phases obtained by quantizing to a small alphabet the phase of a set of tones obtained by taking an IFFT of a portion of a preamble used by a non-interoperable powerline access device. The device may transmit on two or more bands using a sampling frequency clock, wherein a lower band clock frequency is equal to or an integer divisor of a higher band clock frequency.

    摘要翻译: 用于通过电力线传送数字数据的装置包括用于通过至少一个频带传送数据的电力线接口。 正交频分复用(OFDM)调制单元使用用于频带的一组音调来生成OFDM符号。 前导码生成单元通过使用由OFDM调制单元使用的音调集合来生成用于频带的前同步码序列。 由前置码生成单元使用的音调具有恒定的幅度,以及通过将非可互操作的电力线使用的前置部分的一部分的IFFT获得的一组音调的相位来量化到小的字母而获得的一组相位 访问设备 该装置可以使用采样频率时钟在两个或更多个频带上进行传输,其中较低频带时钟频率等于较高频带时钟频率的整数除数。

    Communications in Beacon-Enabled Networks
    32.
    发明申请
    Communications in Beacon-Enabled Networks 有权
    信标网络中的通信

    公开(公告)号:US20120257639A1

    公开(公告)日:2012-10-11

    申请号:US13435862

    申请日:2012-03-30

    IPC分类号: H04J4/00 H04J3/00 H04B3/54

    摘要: Systems and methods for designing, using, and/or implementing communications in beacon-enabled networks are described. In various implementations, these systems and methods may be applicable to power line communications (PLC). For example, a method may include identifying one of a plurality of orthogonal superframes. The identified superframe may include beacon slots and contention access period (CAP) slots. The beacon slots may follow a sequence of two or more frequency subbands, and the CAP slots may follow the same sequence of two or more frequency subbands. Also, the sequence of two or more frequency subbands may be distinct from other sequences of two or more frequency subbands followed by other beacon slots and CAP slots within others of the plurality of available superframes. The method may then include communicating with another device using the identified superframe.

    摘要翻译: 描述了在启用信标的网络中设计,使用和/或实现通信的系统和方法。 在各种实现中,这些系统和方法可以应用于电力线通信(PLC)。 例如,方法可以包括识别多个正交超帧中的一个。 所识别的超帧可以包括信标时隙和竞争接入时隙(CAP)时隙。 信标时隙可以遵循两个或更多个频率子带的序列,并且CAP时隙可以遵循两个或更多个频率子带的相同序列。 而且,两个或多个频率子带的序列可以与两个或多个频率子带的其他序列不同,后面是多个可用超帧中的其他信标时隙和CAP时隙。 该方法然后可以包括使用所识别的超帧与另一设备进行通信。

    Communication on a Pilot Wire
    33.
    发明申请
    Communication on a Pilot Wire 有权
    飞行员通讯

    公开(公告)号:US20120002714A1

    公开(公告)日:2012-01-05

    申请号:US13163513

    申请日:2011-06-17

    IPC分类号: H03K7/08

    摘要: Systems and methods are disclosed for communicating on a pilot wire between Electric Vehicle Service Equipment (EVSE) and an Electric Vehicle (EV). The EVSE and EV exchange a Pulse Width Modulation (PWM) signal on the pilot wire to control charging operations of the EV. Data communications may also be transmitted on the pilot wire, such as between transmit and receive modems. The modems transmit communication signals either continuously, without regard to the state of the PWM signal, or only when the PWM is in an off-state. If transmitting while PWM is on, the modem needs a large coupling impedance and/or a large signal injection. To transmit only when the PWM is off, the modem may use a blocking diode in the coupling circuit or may synchronize to the pulses in the PWM signal.

    摘要翻译: 公开了用于在电动车辆服务设备(EVSE)和电动车辆(EV)之间的导线上通信的系统和方法。 EVSE和EV在导线上交换脉宽调制(PWM)信号,以控制EV的充电操作。 数据通信也可以在导线上传输,例如在发射和接收调制解调器之间。 调制解调器连续发送通信信号,而不考虑PWM信号的状态,或仅当PWM处于关闭状态时。 如果在PWM打开时发送,则调制解调器需要大的耦合阻抗和/或大的信号注入。 仅在PWM关闭时传输,调制解调器可以在耦合电路中使用阻塞二极管,或者可以与PWM信号中的脉冲同步。

    Multipath equalization for MIMO multiuser systems
    34.
    发明授权
    Multipath equalization for MIMO multiuser systems 有权
    MIMO多用户系统的多路径均衡

    公开(公告)号:US07933342B2

    公开(公告)日:2011-04-26

    申请号:US10173282

    申请日:2002-06-17

    IPC分类号: H04K1/10 H04L27/28

    摘要: Interference rejection (85) can be applied to a wireless communication signal with reduced computational complexity by producing from a sample vector (y) a plurality of vectors (w) that are smaller than the sample vector. The interference rejection operation can then be applied to each of the smaller vectors individually to decide communication symbols represented by the sample vector.

    摘要翻译: 通过从样本矢量(y)产生小于样本矢量的多个矢量(w),干扰抑制(85)可以应用于具有降低的计算复杂度的无线通信信号。 然后可以将干扰抑制操作单独地应用于每个较小的矢量,以决定由样本矢量表示的通信符号。

    Pilot design and channel estimation
    35.
    发明授权
    Pilot design and channel estimation 有权
    导频设计和信道估计

    公开(公告)号:US07660229B2

    公开(公告)日:2010-02-09

    申请号:US11424939

    申请日:2006-06-19

    IPC分类号: H04J11/00

    摘要: Embodiments of the invention provide method and apparatus for generating a structure in an orthogonal frequency division multiplexing OFDM communication system having a transmitter with one or more transmitting antennas. The method includes composing a frame with a time domain and a frequency domain. The frame has a transmission time interval in the time domain and occupies a bandwidth in the frequency domain. The transmission time interval has multiple orthogonal frequency division multiplexing symbols. A pilot signal is located from a transmitting antenna into two non-consecutive orthogonal frequency division multiplexing symbols of the frame.

    摘要翻译: 本发明的实施例提供了在具有一个或多个发射天线的发射机的正交频分复用OFDM通信系统中生成结构的方法和装置。 该方法包括组合具有时域和频域的帧。 该帧在时域中具有传输时间间隔并占据频域中的带宽。 传输时间间隔具有多个正交频分复用符号。 导频信号从发射天线位于帧的两个非连续正交频分复用符号中。

    Code Division Multiple Access Wireless System With Closed Loop Mode Using Ninety Degree Phase Rotation and Beamformer Verification
    36.
    发明申请
    Code Division Multiple Access Wireless System With Closed Loop Mode Using Ninety Degree Phase Rotation and Beamformer Verification 有权
    使用九十度相位旋转和波束成形器验证的闭环模式的码分多址无线系统

    公开(公告)号:US20070165699A1

    公开(公告)日:2007-07-19

    申请号:US11681088

    申请日:2007-03-01

    IPC分类号: H04B1/00

    摘要: A wireless communication system (10). The system comprises a user station (12). The user station comprises despreading circuitry (22) for receiving and despreading a plurality of slots received from at least a first transmit antenna (A121) and a second transmit antenna (A122) at a transmitting station (14). Each of the plurality of slots comprises a first channel (DPCH) comprising a first set of pilot symbols and a second channel (PCCPCH) comprising a second set of pilot symbols. The user station further comprises circuitry (50) for measuring a first channel measurement (α1,n) for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry (50) for measuring a second channel measurement (a2,n) for each given slot in the plurality of slots from the second transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry (52) for measuring a phase difference value (φ2(n)) for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot.

    摘要翻译: 一种无线通信系统(10)。 该系统包括用户站(12)。 用户站包括解扩电路(22),用于接收和解扩从至少第一发射天线(A 12 1 1)和第二发射天线(A 12&lt; 2&gt; 1& / SUB>)。 多个时隙中的每一个包括包括第一组导频符号的第一信道(DPCH)和包括第二组导频符号的第二信道(PCCPCH)。 用户站还包括电路(50),用于测量来自第一发射天线的多个时隙中的每个给定时隙的第一信道测量(α1,n N),并且响应于第一组 导频符号在给定的时隙。 用户站还包括电路(50),用于测量来自第二发射天线的多个时隙中的每个给定时隙的第二信道测量(α2,n N),并且响应于第一组 导频符号在给定的时隙。 用户站还包括用于响应于第一信道测量和第二信道测量而针对多个时隙中的每个给定时隙测量相位差值(phi <2> 2(n))的电路(52) 对于给定的时隙,并且响应于给定时隙相对于由紧接在给定时隙之前的解扩电路接收的时隙的九十度旋转。

    Multimode detection
    39.
    发明申请
    Multimode detection 审中-公开
    多模式检测

    公开(公告)号:US20060018410A1

    公开(公告)日:2006-01-26

    申请号:US10899615

    申请日:2004-07-26

    IPC分类号: H03D1/00

    摘要: In a wireless MIMO system, a multimode detector selects detection mode by channel estimation: ill-conditioned channels trigger use of high performance detection, whereas well-behaved channels lead to low complexity detection. Detection modes typically include maximum likelihood, minimum mean squared error, zero forcing, and so forth.

    摘要翻译: 在无线MIMO系统中,多模式检测器通过信道估计选择检测模式:不良条件的信道触发使用高性能检测,而良好的信道导致检测低复杂度。 检测模式通常包括最大似然,最小均方误差,零强迫等。

    Multi-bank OFDM high data rate extensions
    40.
    发明申请
    Multi-bank OFDM high data rate extensions 审中-公开
    多行OFDM高数据速率扩展

    公开(公告)号:US20050237923A1

    公开(公告)日:2005-10-27

    申请号:US11115816

    申请日:2005-04-26

    CPC分类号: H04L27/2602 H04B7/02

    摘要: A transmitter 200 is provided. The transmitter 200 comprises a mapper 207 operable to map a bit stream into a plurality of tones to promote high data rate multi-band orthogonal frequency division multiplex communication, wherein the tones can take on sixteen or more different values 300. In another embodiment a communications system 1360 is provided that includes a transceiver 1362 that has two or more antennas 1394 and 1396. The transceiver 1362 transmits a first multi-band orthogonal frequency division multiplex signal in multiple input/multiple output mode and receives a second multi-band orthogonal frequency division multiplex signal in multiple input/multiple output mode. In another embodiment, a transceiver 200, 202 transmits a first multi-band orthogonal frequency division multiplex symbol concurrently on a plurality of sub-bands and receives a second multi-band orthogonal frequency division multiplex symbol concurrently on a plurality of sub-bands.

    摘要翻译: 提供发射机200。 发射机200包括映射器207,其可操作以将比特流映射成多个音调以促进高数据速率多频带正交频分多路复用通信,其中音调可以具有十六个或更多个不同的值300.在另一个实施例中,通信 提供系统1360,其包括具有两个或多个天线1394和1396的收发机1362.收发机1362以多输入/多输出模式发送第一多频带正交频分多路复用信号,并接收第二多频带正交频分 多重输入/多输出模式下的多路复用信号。 在另一个实施例中,收发器200,202在多个子带上同时发送第一多频带正交频分复用符号,并且在多个子带上同时接收第二多频带正交频分复用符号。