Invention Grant
- Patent Title: Frequency shaping and adaptive rounding for O-QPSK and MSK transmission in polar coordinates
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Application No.: US15255659Application Date: 2016-09-02
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Publication No.: US09960940B2Publication Date: 2018-05-01
- Inventor: Koorosh Akhavan , Eunmo Kang , Rajapaksa Senaratne
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Muncy, Geissler, Olds, Lowe, P.C./Qualcomm
- Main IPC: H04L27/20
- IPC: H04L27/20 ; H04B1/04 ; H04L25/03 ; H04B1/00 ; H04L27/12

Abstract:
Systems and methods are directed to phase modulation of polar coordinates in a transmitter of wireless signals, to achieve high transmit power levels while meeting spectral mask and EVM requirements. An input signal is mapped to a sequence of modulation frequency (e.g., O-QPSK to MSK) to generate a mapped signal. A digital frequency shaping filter is applied to the mapped signal to generate a shaped signal. An adaptive rounding algorithm is applied to the shaped signal to generate a reduced bit-width signal. A digital frequency synthesizer is applied to the reduced bit-width signal to generate an analog waveform for transmission.
Public/Granted literature
- US20170288921A1 FREQUENCY SHAPING AND ADAPTIVE ROUNDING FOR O-QPSK AND MSK TRANSMISSION IN POLAR COORDINATES Public/Granted day:2017-10-05
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