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
    • 7. 发明授权
    • Preamble design for frequency offset estimation and channel equalization in burst OFDM transmission system
    • 用于突发OFDM传输系统中的频偏估计和信道均衡的前导码设计
    • US07554902B2
    • 2009-06-30
    • US10420693
    • 2003-04-23
    • Ki-yun KimHo KimHyung-jin Choi
    • Ki-yun KimHo KimHyung-jin Choi
    • H04J11/00
    • H04L27/2607H04L27/2657H04L27/2675
    • Provided is a transmission data frame in an orthogonal frequency division multiplexing (OFDM) burst mode transmission, and more particularly, a frequency offset estimating method and a channel equalizing method using a transmission data frame. In the transmission data frame used in the orthogonal frequency division multiplexing burst mode transmission, a length of a guard interval in a preamble area for frequency offset estimation and channel estimation varies depending on a channel environment not being limited in consideration of a size of a data symbol, and only data of ending part of the guard interval in the preamble is used to estimate frequency offset in consideration of intersymbol interference. In the frequency offset estimating method, desired frequency estimation efficiency can be satisfied with the small number of samples. Also, when channel equalization is performed, two symbols are averaged in a time area to reduce the accuracy of channel estimation due to Gaussian random noise. In a frequency area, by referring to weight placed on an adjacent subcarrier, a channel equalization coefficient is obtained to efficiently reduce Gaussian random noise.
    • 提供了正交频分复用(OFDM)突发模式传输中的发送数据帧,更具体地,使用使用发送数据帧的频率偏移估计方法和信道均衡方法。 在正交频分复用突发模式传输中使用的发送数据帧中,用于频偏估计和信道估计的前同步码区域中的保护间隔的长度根据不受数据大小限制的信道环境而变化 符号,并且仅使用前导码中的保护间隔的结束部分的数据来估计考虑码间干扰的频率偏移。 在频率偏移估计方法中,可以利用少量样本来满足期望的频率估计效率。 此外,当执行信道均衡时,在时间区域中平均两个符号以降低由于高斯随机噪声导致的信道估计的准确度。 在频率区域中,通过参考相邻子载波上的权重,获得信道均衡系数以有效地降低高斯随机噪声。