Invention Grant
- Patent Title: Peak-to-average power ratio reduction for IQ transmitters
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Application No.: US16607893Application Date: 2017-06-27
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Publication No.: US11038732B2Publication 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

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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