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1. (WO2007003233) RAMPING IN MULTIMODE TRANSMITTERS USING PRIMED FIR FILTERS

Pub. No.:    WO/2007/003233    International Application No.:    PCT/EP2005/053175
Publication Date: Jan 11, 2007 International Filing Date: Jul 4, 2005
IPC: H04L 27/00
Applicants: FREESCALE SEMICONDUCTOR, INC
O'KEEFFE, Conor
O'SULLIVAN, Robert
PRATT, Patrick
Inventors: O'KEEFFE, Conor
O'SULLIVAN, Robert
PRATT, Patrick
Title: RAMPING IN MULTIMODE TRANSMITTERS USING PRIMED FIR FILTERS
Abstract:
A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters (308,408)are primed with a sequence using a parallel input mode before serially entering the information data.