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    • 8. 发明授权
    • System and method for data scrambling to reduce the crest factor in an OFDM waveform
    • 用于数据加扰的系统和方法,以减少OFDM波形中的波峰因数
    • US06785258B1
    • 2004-08-31
    • US09590004
    • 2000-06-08
    • Salvador Garcia, Jr.Eamonn GormleyElliott Hoole
    • Salvador Garcia, Jr.Eamonn GormleyElliott Hoole
    • H04B7208
    • H04B7/0413H04L25/03866H04L27/2602H04L27/2614H04L27/2615
    • A method is provided for minimizing the peak power level in a combination of orthogonal frequency division multiplexed (OFDM) tones. The method is particularly effective when the information to be communicated is digital data consisting of long patterns of “1”s or “0”s. The digital data of the message is combined with a scrambling vector before the data is modulated. The randomization of data patterns, in turn, leads to a more random combination of OFDM tone amplitude being transmitted. The message is recovered at the receiver by removing the scrambling vector. A table of scrambling vectors is maintained at the transmitters and receivers. The table pointer to select the scrambling vector is selected in response to the position of the message in the communication structure. An OFDM communication system using the above-described method is also provided.
    • 提供了一种用于使正交频分复用(OFDM)音调的组合中的峰值功率电平最小化的方法。 当要传送的信息是由“1”或“0”的长模式组成的数字数据时,该方法特别有效。 在调制数据之前,将消息的数字数据与加扰矢量组合。 数据模式的随机化反过来导致正在传输的OFDM音调幅度的更随机组合。 通过去除加扰向量在接收机处恢复消息。 在发射机和接收机处保持加扰矢量表。 响应于通信结构中的消息的位置来选择用于选择加扰向量的表指针。 还提供了使用上述方法的OFDM通信系统。