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    • 1. 发明授权
    • Method for transmitting radio signals and receiver for receiving radio signals
    • 用于发送无线电信号的方法和用于接收无线电信号的接收机
    • US06822953B1
    • 2004-11-23
    • US09590399
    • 2000-06-08
    • Wolfgang SchaeferFrank HofmannChristian Hansen
    • Wolfgang SchaeferFrank HofmannChristian Hansen
    • H04B7208
    • H04B7/12H04H20/22
    • A method for transmitting radio signals and a receiver for receiving radio signals are described which are used to present a radio station which is transmitted on multiple frequencies with the data on the frequency that has the best signal quality. Via received radio signals the receiver is provided a list of all the frequencies on which radio stations are transmitted, the receiver checking each frequency to determine whether the frequency belongs to the radio station selected by the user and whether the signal quality is better than that which is used for the presentation of the radio station. Test symbols having pilots and useful data signals are used to determine the signal quality. An identification number for the radio station is determined from the useful data signals of the test symbols before the signal quality is checked and a channel estimate is made via the pilots. The test symbols are modulated with coherent QPSK. A test symbol is recognized in the data flow by a different protective interval.
    • 描述用于发送无线电信号的方法和用于接收无线电信号的接收机,其用于呈现在具有最佳信号质量的频率上的数据在多个频率上发送的无线电台。 通过接收到的无线电信号,接收机被提供了发射无线电台的所有频率的列表,接收机检查每个频率以确定频率是否属于用户选择的无线电台,以及信号质量是否优于 用于演播无线电台。 使用具有导频和有用数据信号的测试符号来确定信号质量。 在检查信号质量之前,从测试符号的有用数据信号确定无线电台的识别号,并且经由导频进行信道估计。 测试符号用相干QPSK调制。 在数据流中以不同的保护间隔识别测试符号。
    • 2. 发明授权
    • Method for frame and frequency synchronization of an OFDM signal and method for transmitting an OFDM signal
    • 用于OFDM信号的帧和频率同步的方法以及用于发送OFDM信号的方法
    • US07339882B2
    • 2008-03-04
    • US10473631
    • 2002-03-15
    • Wolfgang SchaeferChristian Hansen
    • Wolfgang SchaeferChristian Hansen
    • H04J11/00
    • H04L1/0056H04L1/0071H04L27/2656H04L27/2657H04L27/2675
    • A method for frame and frequency synchronization of an OFDM signal and a signal for transmitting an OFDM signal is described, the purpose of which is to impress a pilot phase profile that is then used at the receiving end for frame and frequency synchronization on pilots which are already contained in the OFDM signal for channel estimation. This has the advantage that no additional transmission capacity has to be used for the synchronization. The method according to the present invention is initiated by a rough time synchronization unit connected upline, which searches for the beginning of the guard interval in the OFDM signal. The comparison between a stored pilot phase profile and the received subcarrier symbol is performed using a cross-correlation, whose result is then evaluated to determine the frame and frequency synchronization.
    • 描述了一种用于OFDM信号的帧和频率同步的方法和用于发送OFDM信号的信号的方法,其目的是在导频上施加导频相位分布,该导频相位分布在接收端被用于帧和频率同步, 已经包含在OFDM信号中用于信道估计。 这具有不需要用于同步的附加传输容量的优点。 根据本发明的方法由连续上行的粗略的时间同步单元启动,其在OFDM信号中搜索保护间隔的开始。 使用互相关来执行存储的导频相位轮廓和接收的副载波符号之间的比较,然后对其结果进行评估以确定帧和频率同步。