会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明申请
    • METHOD FOR ESTIMATING AMOUNT OF DISTORTION IN CFO AND DCO, METHOD FOR COMPENSATING RECEIVED SIGNALS USING THE SAME, AND RECEIVER
    • 用于估计CFO和DCO中的失真量的方法,用于对使用其的接收信号进行补偿的方法和接收器
    • US20100246723A1
    • 2010-09-30
    • US12740028
    • 2008-11-05
    • Hai LinKatsumi Yamashita
    • Hai LinKatsumi Yamashita
    • H04B1/10H04L25/06
    • H04L27/2657H04L27/2675
    • A received signal delivered through a transmission line can be compensated for CFO and DCO to improve the SNR of the received signal, eventually resulting in an effective improvement in the error rate. In this context, methods for estimating and compensating for CFO and DCO have been studied, for example, using pilot signals or a blind method. However, the methods would require a huge amount of calculations for the estimation of CFO in the presence of DCO, as with the ML method, or never essentially eliminate errors from an estimated value. The received signal has convoluted influences through the transmission line, so that observation of the continual symbols of periodic pilot signals on the frequency axis shows just a phase shift by the CFO. Therefore, the CFO can be analytically found from the continual symbols of periodic pilot signals, thereby allowing the DCO to be estimated and both the CFO and the DCO to be compensated for.
    • 通过传输线传送的接收信号可以补偿CFO和DCO,以改善接收信号的SNR,最终导致错误率的有效改善。 在这方面,已经研究了用于估计和补偿CFO和DCO的方法,例如使用导频信号或盲法。 然而,如同ML方法一样,这些方法将需要大量的计算,以便在存在DCO的情况下估计CFO,或从不从本质上消除估计值的误差。 接收到的信号通过传输线路产生卷积影响,从而在频率轴上观察到周期性导频信号的连续符号只是CFO的相移。 因此,可以从周期性导频信号的连续符号中分析地找到CFO,从而允许估计DCO,并且补偿CFO和DCO。
    • 3. 发明申请
    • COMPENSATION METHOD, PROGRAM, RECORDING MEDIUM, AND RECEIVER FOR OFDM SIGNAL HAVING CFO AND DCO
    • 具有CFO和DCO的OFDM信号的补偿方法,程序,记录介质和接收器
    • US20100177851A1
    • 2010-07-15
    • US12665455
    • 2008-06-19
    • Hai LinKatsumi Yamashita
    • Hai LinKatsumi Yamashita
    • H04L25/06H04L27/06
    • H04L25/03343H04L25/06H04L27/2657H04L27/2676
    • A frequency offset (CFO) and a direct current component offset (DCO) occur in an OFDM scheme signal. To address this, such a method has been suggested which allows a pilot signal to be mixed with a communicated signal for compensation. However, if the pilot signal has a long duration, then a compensation method without the pilot signal is required to compensate signals during that period. However, no such a method is conventionally available which compensates for both the CFO and DCO without the pilot signal. Using the orthogonality of the OFDM signal, the matrix of a system in which CDO and DCO have occurred is subjected to the singular value decomposition, thereby predetermining the CFO candidate value which allows for demodulating zero from the received signal and an array of numerical values of CFO check data. Then, in a compensation section (17), the received signal is successively multiplied by the numerical values. The typical CFO value provided when the minimum value has been demodulated is outputted as an estimate value for compensation.
    • 在OFDM方案信号中出现频率偏移(CFO)和直流分量偏移(DCO)。 为了解决这个问题,已经提出了这样的方法,其允许将导频信号与通信信号混合以进行补偿。 然而,如果导频信号具有较长的持续时间,则需要不具有导频信号的补偿方法来补偿该期间的信号。 然而,没有这种传统上可用的方法来补偿没有导频信号的CFO和DCO。 使用OFDM信号的正交性,其中发生CDO和DCO的系统的矩阵经受奇异值分解,从而预先确定允许从接收信号中解调零的CFO候选值和数字值 CFO检查数据。 然后,在补偿部(17)中,将接收信号依次乘以数值。 当解调最小值时提供的典型CFO值作为补偿的估计值被输出。
    • 4. 发明申请
    • METHOD FOR DETERMINING HYBRID DOMAIN COMPENSATION PARAMETERS FOR ANALOG LOSS IN OFDM COMMUNICATION SYSTEMS AND COMPENSATING FOR THE SAME
    • 用于确定OFDM通信系统中模拟丢失的混合域补偿参数的方法及其相互补偿
    • US20110206105A1
    • 2011-08-25
    • US13125881
    • 2009-11-02
    • Hai LinKatsumi Yamashita
    • Hai LinKatsumi Yamashita
    • H04B17/00H04L27/01
    • H04B7/0851H04B7/0426H04B7/0854
    • In a transmit/receive system, the carrier frequency offset (CFO), I/Q imbalance, and DC offset (DCO) can cause serious signal distortions. These analog losses can be compensated for individually or in combination of any two of them by following various methods that have been suggested. However, there have suggested no methods of simultaneously compensating, for these three types of losses that occur in actual devices at the same time. The present invention suggests a novel pilot signal that has a cyclic signal portion and a portion of two equally spaced continual signals. The invention provides a method for compensating for the CFO, I/Q imbalance, and DCO by simultaneously performing the time domain compensation and the channel estimation using those signal portions. The method also compensates for the I/Q imbalance and the channel response on the transmitter side in the OFDM scheme.
    • 在发送/接收系统中,载波频率偏移(CFO),I / Q不平衡和DC偏移(DCO)可能导致严重的信号失真。 这些模拟损失可以通过遵循已经提出的各种方法单独地或通过其中任何两个的组合来补偿。 然而,对于同时在实际装置中发生的这三种类型的损耗,没有提出同时补偿的方法。 本发明提出了一种新颖的导频信号,其具有循环信号部分和两个等间隔的连续信号的一部分。 本发明提供了一种用于通过同时执行时域补偿和使用这些信号部分的信道估计来补偿CFO,I / Q不平衡和DCO的方法。 该方法还补偿OFDM方案中发射机侧的I / Q不平衡和信道响应。