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    • 74. 发明专利
    • Radio communication apparatus, error correcting method and error correcting program
    • 无线电通信设备,错误校正方法和错误校正程序
    • JP2011077940A
    • 2011-04-14
    • JP2009228841
    • 2009-09-30
    • Fujitsu Ltd富士通株式会社
    • SEYAMA TAKASHI
    • H04L27/38H03M13/25
    • H04L27/38H04L1/0047H04L25/03292H04L25/067H04L2025/0342H04L2025/03426
    • PROBLEM TO BE SOLVED: To prevent processing delay by determining a logarithmic likelihood ratio fast and efficiently. SOLUTION: A demodulating unit 220 outputs to a soft decision information calculating unit 250 an in-phase (I) component and a quadrature (Q) component of each received symbol included in a received signal as demodulation data. A reference amplitude calculating unit 240 calculates a reference amplitude from a coefficient corresponding to a channel estimate and a modulation scheme and outputs the reference amplitude obtained to the soft decision information calculating unit 250. The soft decision information calculating unit 250 calculates an LLR by bit from the I component and the Q component of each received symbol and the reference amplitude. At this point, the soft decision information calculating unit 250 calculates the LLR for each bit by performing arithmetic operation including arithmetic operation of an absolute value for each bit. Namely, the soft decision information calculating unit 250 uniformly calculates the LLR using the same operation expression for the same bit, regardless of a region, to which the received symbol belongs, on an IQ plane. COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:通过快速有效地确定对数似然比来防止处理延迟。 解决方案:解调单元220向软判决信息计算单元250输出包含在接收信号中的每个接收符号的同相(I)分量和正交(Q)分量作为解调数据。 参考幅度计算单元240根据与信道估计和调制方案相对应的系数来计算参考振幅,并将获得的参考振幅输出到软判定信息计算单元250.软判定信息计算单元250计算来自 每个接收符号的I分量和Q分量以及参考振幅。 此时,软判决信息计算单元250通过执行包括每个比特的绝对值的算术运算的算术运算来计算每个比特的LLR。 也就是说,软判决信息计算单元250使用与相同比特相同的操作表达式统一地计算LLR,而不管接收符号所属的区域如何,都在IQ平面上。 版权所有(C)2011,JPO&INPIT
    • 77. 发明专利
    • Communication equipment, communication method and computer program
    • 通信设备,通信方法和计算机程序
    • JP2009302771A
    • 2009-12-24
    • JP2008153240
    • 2008-06-11
    • Sony Corpソニー株式会社
    • SAWAI AKIRA
    • H04J99/00H04B7/04
    • H04L25/0204H04L25/0228H04L25/0242H04L25/03197H04L25/03242H04L27/3416H04L27/38H04L2025/0342H04L2025/03426
    • PROBLEM TO BE SOLVED: To provide communication equipment capable of preventing the degradation of characteristics during decoding a signal modulated by a modulation system in which a phase error component and an amplitude error component have a great effect on demodulation.
      SOLUTION: The communication equipment includes: a transmission pattern generating part for generating a transmission pattern corresponding to the modulation system; a metric calculation part for calculating an inter-signal distance between a reception signal vector of a received signal and an estimated vector being a product of channel information and the transmission pattern; a maximum likelihood pattern determination part for determining a maximum likelihood signal pattern from the inter-signal distance calculated by the metric calculation part; and an error estimation part for estimating phase error components and amplitude error components included in the reception signal vector, wherein the metric calculation part calculates an inter-signal distance between the reception signal vector and the estimated vector while reflecting the phase error components and/or the amplitude error components estimated by the error estimating part.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:提供能够防止在由相位误差分量和振幅误差分量对解调具有很大影响的调制系统调制的信号进行解码期间特性劣化的通信设备。 解决方案:通信设备包括:传输模式产生部分,用于产生与调制系统相对应的传输模式; 度量计算部分,用于计算接收信号的接收信号矢量与作为信道信息与传输模式的乘积的估计矢量之间的信号间距离; 最大似然模式确定部分,用于根据由度量计算部分计算的信号间距离确定最大似然信号模式; 以及用于估计包括在接收信号矢量中的相位误差分量和振幅误差分量的误差估计部分,其中度量计算部分计算接收信号矢量和估计矢量之间的信号间距离,同时反映相位误差分量和/或 由误差估计部估计的振幅误差分量。 版权所有(C)2010,JPO&INPIT