• Patent Title: Peak-to-average power ratio reduction for IQ transmitters
  • Application No.: US16607893
    Application Date: 2017-06-27
  • Publication No.: US11038732B2
    Publication Date: 2021-06-15
  • Inventor: Christian Mayer
  • Applicant: Apple Inc.
  • Applicant Address: US CA Cupertino
  • Assignee: Apple Inc.
  • Current Assignee: Apple Inc.
  • Current Assignee Address: US CA Cupertino
  • Agency: Eschweiler & Potashnik, LLC
  • International Application: PCT/US2017/039435 WO 20170627
  • International Announcement: WO2019/005007 WO 20190103
  • Main IPC: H04L27/26
  • IPC: H04L27/26 H04L27/34
Peak-to-average power ratio reduction for IQ transmitters
Abstract:
A method configured to clip an I signal and a Q signal according to a clipping boundary, includes receiving an I value and a Q value, wherein the I value and Q value define Cartesian coordinates of a data point being transmitted on the real and imaginary axes of the complex plane, respectively; determining a clipping error between the I value and the Q value and the clipping boundary; combining the clipping error with the I value to generate a clipped I value; combining the same clipping error with the Q value to generate a clipped Q value; and providing the clipped I value and the clipped Q value to a radio frequency digital-to-analog converter (RFDAC) in a transmit chain.
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