Digital baseband of the polar transmitter*
Abstract
This chapter focuses on the baseband part of the digital polar transmitter. It takes binary data stream and provides mapping to appropriate offset 8-PSK symbols. Pulse shaping filter is used to shape the spectrum of output I/Q waveforms to comply with EDGE frequency spectrum specifications. CORDIC is used to convert this data from Cartesian domain to polar (amplitude/phase) domain. This conversion results in bandwidth expansion for phase path, which is explained in Section 3.5. INL nonlinearity of the DPA is corrected by a predistortion scheme, covered in Section 3.2. Self-calibration of the predistortion is covered in Section 3.3. Predistorted amplitude/phase data is upcoverted ...
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