Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2004-04-13
2008-08-05
Payne, David C. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07409009
ABSTRACT:
A technique of reducing the Peak-to-Average Power Ratio (PAPR) of Multi-Carrier (MC) modulated signals in which peaks in the baseband signal that lie above a threshold amplitude are detected and used to generate a pulse sequence signal which, after shaping, is subtracted from the baseband signal to reduce its PAPR. The method is spectrally efficient, has a low degree of implementation complexity and hence it is also suitable for low-power, portable implementation. Moreover, it is compatible with existing standard-based Orthogonal Frequency Division Multiplex (OFDM) systems. As an example of the performance of the proposed scheme, the amplifier back-off requirement in a Terrestrial Digital Video Broadcast (DVB-T) system can be reduced from 12 to 6 dB, while satisfying the of out-of-band emission specifications imposed by the Federal Communications Commission (FCC) spectral mask.
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Nguyen Leon-Viet Q
O'Melveny & Myers LLP
Payne David C.
Univeristy of Southampton
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