Frequency tracking for OFDM transmission over frequency selective channels
    2.
    发明授权
    Frequency tracking for OFDM transmission over frequency selective channels 有权
    通过频率选择信道进行OFDM传输的频率跟踪

    公开(公告)号:US07515657B1

    公开(公告)日:2009-04-07

    申请号:US10985860

    申请日:2004-11-10

    IPC分类号: H04L27/00 H04L27/06

    CPC分类号: H04L27/2657 H04L27/2679

    摘要: A system comprises a receiver module that generates a receiver carrier frequency and that demodulates an orthogonal frequency division multiplexing (OFDM) signal using the receiver carrier frequency. A CFO estimator module communicates with the receiver module and generates a carrier frequency offset (CFO) estimate using an M-th power method and normalizing a magnitude thereof. Another CFO estimator module communicates with the receiver module and generates a carrier frequency offset (CFO) of the OFDM signal using an M-th power method and normalizing a magnitude thereof. The CFO estimator module may be blind. The OFDM signal may also contain pilot subcarriers. The pilot subcarriers may contain known pilot symbols.

    摘要翻译: 一种系统包括:接收机模块,其生成接收机载波频率,并使用接收机载波频率解调正交频分复用(OFDM)信号。 CFO估计器模块与接收器模块进行通信,并使用M次方法生成载波频率偏移(CFO)估计值并对其幅度进行归一化。 另一个CFO估计器模块与接收机模块进行通信,并使用M次方法生成OFDM信号的载波频率偏移(CFO),并对其幅度进行归一化。 CFO估计模块可能是盲目的。 OFDM信号还可以包含导频子载波。 导频子载波可以包含已知的导频符号。

    Soft decoding of coded bit-streams
    4.
    发明授权
    Soft decoding of coded bit-streams 有权
    编码比特流的软解码

    公开(公告)号:US08774289B1

    公开(公告)日:2014-07-08

    申请号:US13355349

    申请日:2012-01-20

    IPC分类号: H04L25/00

    摘要: A transmitter can include an encoder configured to encode a data sequence based on a first encoding rate to generate a first encoded bit stream having first bits with at least one first repeated bit and encode the data sequence based on a second, different encoding rate to generate a second encoded bit stream having second bits with at least one second repeated bit, where the first and second encoded bit streams each fully represent the data sequence. A receiver can include circuitry configured to produce identified repeated bits by identifying a repeated bit in the first encoded bit stream and a repeated bit in the second encoded bit stream that correspond to a same bit position, combine the first encoded bit stream and the second encoded bit stream including the identified repeated bits to generate a combined bit stream, and decode the combined bit stream.

    摘要翻译: 发射机可以包括编码器,其被配置为基于第一编码速率对数据序列进行编码,以产生具有至少一个第一重复比特的第一比特的第一编码比特流,并且基于第二不同编码率对该数据序列进行编码以产生 第二编码比特流,具有具有至少一个第二重复比特的第二比特,其中第一和第二编码比特流各自完全表示数据序列。 接收机可以包括被配置为通过识别第一编码比特流中的重复比特和对应于相同比特位置的第二编码比特流中的重复比特来产生识别的重复比特的电路,组合第一编码比特流和第二编码比特流 包括所识别的重复比特以产生组合比特流,并对组合的比特流进行解码。

    Adaptive OFDM receiver based on carrier frequency offset
    5.
    发明授权
    Adaptive OFDM receiver based on carrier frequency offset 有权
    基于载波频偏的自适应OFDM接收机

    公开(公告)号:US08311152B1

    公开(公告)日:2012-11-13

    申请号:US10986110

    申请日:2004-11-10

    CPC分类号: H04L27/2657 H04B7/01

    摘要: An adaptive receiver comprises a receiver module that receives an orthogonal frequency division multiplexing (OFDM) signal. An operating parameters module monitors at least one operating parameter of the receiver module and generates a select signal based the at least one operating parameter. An estimator module selects between first and second algorithms based on the select signal and selectively estimates a carrier frequency offset (CFO) of the OFDM signal using the one of the first and second algorithms. Alternately, an estimator module adjusts algorithm operating parameters of a first algorithm based on the select signal and selectively estimates a carrier frequency offset (CFO) of the OFDM signal using the selected algorithm operating parameters of the first algorithm.

    摘要翻译: 自适应接收机包括接收正交频分复用(OFDM)信号的接收机模块。 操作参数模块监视接收机模块的至少一个操作参数,并基于该至少一个操作参数生成选择信号。 估计器模块基于选择信号在第一和第二算法之间进行选择,并且使用第一和第二算法之一选择性地估计OFDM信号的载波频率偏移(CFO)。 或者,估计器模块基于选择信号来调整第一算法的算法运行参数,并且使用所选择的算法运算参数选择性地估计OFDM信号的载波频率偏移(CFO)。

    Adaptive OFDM transmitter based on carrier frequency offset
    7.
    发明授权
    Adaptive OFDM transmitter based on carrier frequency offset 有权
    基于载波频偏的自适应OFDM发射机

    公开(公告)号:US07756003B1

    公开(公告)日:2010-07-13

    申请号:US10986130

    申请日:2004-11-10

    CPC分类号: H04L27/2657 H04B7/01

    摘要: A system comprises a transmitter module that receives transmitter data, that includes at least one transmitter operating parameter and that generates an orthogonal frequency division multiplexing (OFDM) signal based on the transmitter data and the at least one transmitter operating parameter. An operating parameters generating module receives a carrier frequency offset (CFO), communicates with the transmitter module and adjusts the at least one transmitter operating parameter based on the CFO. The transmitter module adjusts a parameter of at least one of a channel coding module, a modulating module, and/or a power control module based on the CFO.

    摘要翻译: 一种系统包括发射机模块,其接收包括至少一个发射机操作参数并且基于发射机数据和至少一个发射机操作参数产生正交频分复用(OFDM)信号的发射机数据。 操作参数产生模块接收载波频率偏移(CFO),与发射机模块通信,并且基于CFO调整至少一个发射机操作参数。 发射机模块基于CFO调整信道编码模块,调制模块和/或功率控制模块中的至少一个的参数。