Patents by Inventor Richard D. van Nee

Richard D. van Nee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Transmission system and method employing peak cancellation to reduce the peak-to-average power ratio
    Patent number: 6175551
    Abstract: The present invention teaches a system and method to reduce the peak-to-average power ratio of systems transmitting parallel channels. Examples of such systems are Orthogonal Frequency Division Multiplex (OFDM) and Orthogonal Code Division Multiplex (OCDM), also known as multi-code CDMA. Both systems have the disadvantage of a large peak-to-average power (PAP) ratio, which degrades the efficiency of the power amplifier of the transmitter. The present invention reduces the PAP problem by canceling the large signal peaks through subtraction of an appropriate reference function. That is, a time shifted and scaled reference function is subtracted from the sampled signal, such that each subtracted reference function reduces the peak power of at least one signal sample. In accordance with the present invention, an appropriate reference function with approximately or exactly the same bandwidth as the transmitted signal is selected.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: January 16, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Geert Arnout Awater, Richard D. van Nee, Arnout Hendrik de Wild