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    Orthogonal frequency division multiplexing-code division multiple access system
    4.
    发明授权
    Orthogonal frequency division multiplexing-code division multiple access system 有权

    公开(公告)号：US09614578B2

    公开(公告)日：2017-04-04

    申请号：US14197440

    申请日：2014-03-05

    Applicant: Intel Corporation

    Inventor： Guodong Zhang ,  Yingming Tsai ,  Kyle Jung-Lin Pan

    IPC: H04B1/707 ,  H04B1/711 ,  H04L5/02 ,  H04L25/03

    CPC classification number: H04B1/711 ,  H04L5/026 ,  H04L2025/03414

    Abstract: An orthogonal frequency division multiplexing (OFDM)-code division multiple access (CDMA) system is disclosed. The system includes a transmitter and a receiver. At the transmitter, a spreading and subcarrier mapping unit spreads an input data symbol with a complex quadratic sequence code to generate a plurality of chips and maps each chip to one of a plurality of subcarriers. An inverse discrete Fourier transform is performed on the chips mapped to the subcarriers and a cyclic prefix (CP) is inserted to an OFDM frame. A parallel-to-serial converter converts the time-domain data into a serial data stream for transmission. At the receiver, a serial-to-parallel converter converts received data into multiple received data streams and the CP is removed from the received data. A discrete Fourier transform is performed on the received data streams and equalization is performed. A despreader despreads an output of the equalizer to recover the transmitted data.

    Load estimation in wireless communication
    7.
    发明授权
    Load estimation in wireless communication 有权
    无线通信中的负载估计

    公开(公告)号：US08665937B2

    公开(公告)日：2014-03-04

    申请号：US13514009

    申请日：2009-12-10

    Applicant: Karl Torbjörn Wigren

    Inventor： Karl Torbjörn Wigren

    IPC: H04B17/00

    CPC classification number: H04B1/7097 ,  H04B1/711 ,  H04B17/26 ,  H04B17/327 ,  H04B17/345 ,  H04B2201/709718 ,  H04B2201/709727

    Abstract: A method for noise rise estimation in a wireless communication system comprises receiving (210) of radio signals. An interference whitening (212) is performed. A useful signal power for a first user after the interference whitening is determined (214) for a plurality of time instances. Furthermore, a first user noise floor compensation factor is derived (216) based on combining weights for the first user used in the interference whitening. A probability distribution for a compensated useful signal power for the first user is estimated (218). A conditional probability distribution of a noise floor measure is computed (220). A noise rise measure for the first user is then calculated (222) based at least on the compensated useful signal power for the first user and the conditional probability distribution of a noise floor measure.

    Abstract translation: 一种用于无线通信系统中的噪声上升估计的方法包括：接收（210）无线电信号。 执行干涉增白（212）。 在干扰白化之后确定（214）多个时间实例中的第一用户的有用信号功率。 此外，基于在干扰增白中使用的第一用户的组合权重，导出（216）第一用户噪声基底补偿因子。 估计用于第一用户的补偿有用信号功率的概率分布（218）。 计算噪声本底度量的条件概率分布（220）。 然后，至少基于第一用户的补偿有用信号功率和噪声基底测量的条件概率分布来计算（222）第一用户的噪声上升测量值（222）。

    METHODS AND APPARATUS FOR SIGNAL TRANSMISSION AND RECEPTION IN A BROADBAND COMMUNICATION SYSTEM
    8.
    发明申请
    METHODS AND APPARATUS FOR SIGNAL TRANSMISSION AND RECEPTION IN A BROADBAND COMMUNICATION SYSTEM 有权
    宽带通信系统中信号传输和接收的方法与装置

    公开(公告)号：US20130223414A1

    公开(公告)日：2013-08-29

    申请号：US13861942

    申请日：2013-04-12

    Applicant: Neocific, Inc.

    Inventor： Xiaodong Li ,  Titus Lo ,  Kemin Li ,  Haiming Huang

    IPC: H04B1/711

    CPC classification number: H04L27/2626 ,  H04B1/707 ,  H04B1/711 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0028 ,  H04L25/0228 ,  H04L25/03834 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2602 ,  H04L27/2607 ,  H04L27/2647 ,  H04L27/2655

    Abstract: In a broadband wireless communication system, a spread spectrum signal is intentionally overlapped with an OFDM signal, in a time domain, a frequency domain, or both. The OFDM signal, which inherently has a high spectral efficiency, is used for carrying broadband data or control information. The spread spectrum signal, which is designed to have a high spread gain for overcoming severe interference, is used for facilitating system functions such as initial random access, channel probing, or short messaging. Methods and techniques are devised to ensure that the mutual interference between the overlapped signals is minimized to have insignificant impact on either signal and that both signals are detectable with expected performance by a receiver.

    Abstract translation: 在宽带无线通信系统中，扩频信号有意地与OFDM信号在时域，频域或两者中重叠。 固有地具有高频谱效率的OFDM信号被用于承载宽带数据或控制信息。 被设计为具有用于克服严重干扰的高扩展增益的扩频信号用于促进系统功能，例如初始随机接入，信道探测或短消息传送。 设计了方法和技术，以确保重叠的信号之间的相互干扰被最小化，以对两个信号具有不显着的影响，并且两个信号可由接收机预期的性能来检测。

    Platform noise estimation and mitigation for wireless receivers
    9.
    发明授权
    Platform noise estimation and mitigation for wireless receivers 有权
    无线接收机的平台噪声估计和减轻

    公开(公告)号：US08509364B2

    公开(公告)日：2013-08-13

    申请号：US12886316

    申请日：2010-09-20

    Applicant: Yongfang Guo ,  Xintian Eddie Lin

    Inventor： Yongfang Guo ,  Xintian Eddie Lin

    IPC: H03D1/04

    CPC classification number: H04J11/0063 ,  H04B1/711 ,  H04B17/345 ,  H04J11/005

    Abstract: An apparatus and method suitable to estimate impairments of wireless signals, including both noise and interference of the wireless signals are disclosed herein. The noise of the wireless signals may be caused by thermal noise and platform noise. An adaptive scheme may dynamically switch between estimating interference only or the combined noise and interference. Other embodiments may be disclosed or claimed.

    Abstract translation: 本文公开了适用于估计无线信号的损伤的装置和方法，包括无线信号的噪声和干扰两者。 无线信号的噪声可能由热噪声和平台噪声引起。 自适应方案可以在仅估计干扰或组合的噪声和干扰之间动态地切换。 可以公开或要求保护其他实施例。

    Pre-phase error correction
    10.
    发明授权
    Pre-phase error correction 有权

    公开(公告)号：US08488650B2

    公开(公告)日：2013-07-16

    申请号：US12421028

    申请日：2009-04-09

    Applicant: John D. Kaewell

    Inventor： John D. Kaewell

    IPC: H04B1/00

    CPC classification number: H04L27/20 ,  H04B1/62 ,  H04B1/69 ,  H04B1/7097 ,  H04B1/711 ,  H04B2001/70724 ,  H04B2201/696 ,  H04B2201/709709 ,  H04L2027/0022

    Abstract: A CDMA communication system includes a signal processor which encodes voice and nonvoice signals into data at various rates, e.g. data rates of 8 kbps, 16 kbps, 32 kbps, or 64 kbps as I and Q signals. The signal processor selects a specific data rate depending upon the type of signal, or in response to a set data rate. When the signal is received and demodulated, the baseband signal is at the chip level. Both the I and Q components of the signal are despread using the conjugate of the pn sequence used during spreading, returning the signal to the symbol level. Carrier offset correction is performed at the symbol level. A lower overall processing speed is therefore required.

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