CONFIGURABLE CONSTELLATION MAPPING TO CONTROL SPECTRAL EFFICIENCY VERSUS SIGNAL-TO-NOISE RATIO

    公开(公告)号:US20220021475A1

    公开(公告)日:2022-01-20

    申请号:US17383698

    申请日:2021-07-23

    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

    CONFIGURABLE CONSTELLATION MAPPING TO CONTROL SPECTRAL EFFICIENCY VERSUS SIGNAL-TO-NOISE RATIO

    公开(公告)号:US20190173609A1

    公开(公告)日:2019-06-06

    申请号:US16177219

    申请日:2018-10-31

    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

    ORTHOGONAL FREQUENCY DIVISION MULTIPLEX (OFDM) RECEIVER WITH PHASE NOISE MITIGATION AND REDUCED LATENCY
    6.
    发明申请
    ORTHOGONAL FREQUENCY DIVISION MULTIPLEX (OFDM) RECEIVER WITH PHASE NOISE MITIGATION AND REDUCED LATENCY 有权
    正弦波频分多址(OFDM)接收机,具有相位噪声缓解和减少延迟

    公开(公告)号:US20140211889A1

    公开(公告)日:2014-07-31

    申请号:US13997691

    申请日:2011-12-20

    Abstract: A system according to one embodiment includes a demodulator configured to receive an orthogonal frequency division multiplexed (OFDM) modulated signal comprising a current symbol and a sequence of previous symbols, each of the symbols comprising one or more pilot sub-carriers and one or more data sub-carriers; a phase angle computation circuit coupled to the demodulator, the phase angle computation circuit configured to compute a first mean, the first mean computed from the phase angle of one or more of the pilot sub-carriers of a predetermined number of the previous symbols; a predictive filter circuit coupled to the phase angle computation circuit, the predictive filter circuit configured to compute a second mean, the second mean estimating the phase angle of one or more sub-carriers of the current symbol, the estimation based on the first mean; and a phase noise cancelling circuit coupled to the predictive filter circuit, the phase noise cancelling circuit configured to correct the phase of one or more sub-carriers of the current symbol based on the second mean.

    Abstract translation: 根据一个实施例的系统包括解调器,其被配置为接收包括当前符号和先前符号序列的正交频分复用(OFDM)调制信号,每个符号包括一个或多个导频子载波和一个或多个数据 子载体; 耦合到所述解调器的相位角计算电路,所述相位角计算电路被配置为计算第一平均值,所述第一平均值是从预定数量的先前符号的一个或多个导频子载波的相位角计算的第一平均值; 耦合到所述相位角计算电路的预测滤波器电路,所述预测滤波器电路被配置为计算第二平均值,所述第二平均值估计所述当前符号的一个或多个子载波的相位角,所述估计基于所述第一均值; 以及耦合到所述预测滤波器电路的相位噪声消除电路,所述相位噪声消除电路被配置为基于所述第二均值来校正所述当前符号的一个或多个子载波的相位。

    Configurable constellation mapping to control spectral efficiency versus signal-to-noise ratio

    公开(公告)号:US11075713B2

    公开(公告)日:2021-07-27

    申请号:US16714640

    申请日:2019-12-13

    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.

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