OFDM GENERATION APPARATUS IN A MULTI-CARRIER DATA TRANSMISSION SYSTEM

    公开(公告)号:US20160261448A1

    公开(公告)日:2016-09-08

    申请号:US15155837

    申请日:2016-05-16

    Abstract: The present invention relates to OFDM generation apparatus and methods for generating OFDM transmission signals from OFDM symbols, each comprising a plurality of OFDM subcarriers, for transmission in a multi-carrier data transmission system. An embodiment of the proposed apparatus and method are adapted for using a selected mixing frequency for mixing said complex time-domain samples of said OFDM symbol from a baseband frequency up to a passband frequency by use of a mixing frequency to obtain said OFDM transmission signal, wherein the mixing frequency is selected such that common phase rotations of the OFDM subcarriers of said OFDM symbol with respect to adjacent OFDM symbols of said OFDM transmission signal are avoided or compensated after said mixing. Further embodiments for avoidance or compensation of such common phase rotations are provided.

    RECEIVER FOR RECEIVING DATA IN A BROADCAST SYSTEM
    14.
    发明申请
    RECEIVER FOR RECEIVING DATA IN A BROADCAST SYSTEM 有权
    接收器用于接收广播系统中的数据

    公开(公告)号:US20150288553A1

    公开(公告)日:2015-10-08

    申请号:US14435556

    申请日:2013-11-26

    Abstract: A receiver for receiving data in a broadcast system includes a broadcast receiver that receives via the broadcast system a receiver input data stream including plural channel symbols represented by constellation points in a constellation diagram, a demodulator that demodulates the channel symbols into codewords, and a decoder that decodes the codewords into output data words. A redundancy calculator determines a required amount of redundancy data required for correct demodulation and decoding by use of the originally received channel symbol and additional redundancy data. A broadband request unit requests, if demodulation of a channel symbol and/or decoding of a codeword is erroneous or likely to fail, a required amount of redundancy data via a broadband system, that is received by a broadband receiver via said broadband system. The demodulator and/or the decoder is configured to use the redundancy data for demodulation and decoding, respectively.

    Abstract translation: 用于在广播系统中接收数据的接收机包括广播接收机,其经由广播系统接收包括由星座图中的星座点表示的多个信道符号的接收机输入数据流,将信道符号解调为码字的解调器,以及解码器 将码字解码为输出数据字。 冗余计算器通过使用原始接收的信道符号和附加的冗余数据来确定正确解调和解码所需的冗余数据所需的量。 宽带请求单元如果通道符号的解调和/或码字的解码是错误的或可能失败,则通过宽带系统通过宽带接收机经由所述宽带系统接收所需的冗余数据量。 解调器和/或解码器分别被配置为使用冗余数据进行解调和解码。

    Receiver and method of receiving and transmitter and method of transmitting for OFDM symbols
    15.
    发明授权
    Receiver and method of receiving and transmitter and method of transmitting for OFDM symbols 有权
    接收机和发射机的方法以及发送OFDM符号的方法

    公开(公告)号:US09143290B2

    公开(公告)日:2015-09-22

    申请号:US14052858

    申请日:2013-10-14

    Abstract: A receiver receives payload data transmitted on a downstream using Orthogonal Frequency Division Multiplexed (OFDM) symbols via a cable network. The receiver includes circuitry configured to receive a downstream signal representing the payload data modulated onto one or more OFDM symbols, and to demodulate the OFDM symbols of each frame to detect and to recover the payload data using the physical layer signalling data. One or more of the frames of the received signal includes a preamble of the frame providing the physical layer signalling data, and in a separate media access control (MAC) signal within the frame, upstream messages relating to the transmission of data from the receiver to the transmitter. Accordingly, an arrangement is provided for a cable network communications system in which a capacity for upstream signalling messages for communicating on the downstream can be adapted to a requirement of receivers connected to the network.

    Abstract translation: 接收机通过有线网络使用正交频分复用(OFDM)符号在下游接收有效载荷数据。 接收机包括被配置为接收表示在一个或多个OFDM符号上调制的有效载荷数据的下行信号的电路,以及解调每个帧的OFDM符号以使用物理层信令数据来检测和恢复有效载荷数据。 接收信号的一个或多个帧包括提供物理层信令数据的帧的前导码,并且在该帧内的单独的媒体访问控制(MAC)信号中,与从接收机到数据的传输有关的上行消息 发射机。 因此,提供了一种用于有线网络通信系统的布置,其中用于在下游进行通信的上行信令消息的容量可以适应于连接到网络的接收机的需求。

    CODING AND MODULATION APPARATUS USING NON-UNIFORM CONSTELLATION AND DIFFERENT PHY MODES

    公开(公告)号:US20190109753A1

    公开(公告)日:2019-04-11

    申请号:US16210328

    申请日:2018-12-05

    Abstract: A coding and modulation apparatus and method are presented, particularly for use in a system according to IEEE 802.11. The apparatus comprises an encoder configured to encode input data into cell words according to a low density parity check code, LDPC, and a modulator configured to modulate said cell words into constellation values of a non-uniform constellation and to assign bit combinations to constellation values of the used non-uniform constellation, wherein said modulator is configured to use, based on the PHY mode, the total number M of constellation points of the constellation and the code rate, a particular non-uniform constellation.

    Coding and modulation apparatus using non-uniform constellation

    公开(公告)号:US10177954B2

    公开(公告)日:2019-01-08

    申请号:US15556540

    申请日:2016-03-16

    Abstract: A coding and modulation apparatus and method are presented, particularly for use in a system according to IEEE 802.11. The apparatus comprises an encoder configured to encode input data into cell words according to a binary convolutional code, BCC, or a low density parity check code, LDPC, and a modulator configured to modulate said cell words into constellation values of a non-uniform constellation and to assign bit combinations to constellation values of the used non-uniform constellation, wherein said modulator is configured to use, based on the code used by the encoder, the total number M of constellation points of the constellation and the code rate.

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