Transmission of signal

Pulse or digital communications – Transmitters – Antinoise or distortion

Reexamination Certificate

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Details

C375S261000

Reexamination Certificate

active

10305406

ABSTRACT:
The invention relates to a radio transmitter using QAM modulation, comprising a first transmit filter for filtering data symbols to be transmitted to form a waveform, means for comparing the waveform to a predetermined threshold value, means for clipping power peaks that exceed the predetermined threshold value from the waveform to form a clipped waveform, means for multiplying the clipped power peaks with an impulse response of a receive filter to form an impaired signal, means for subtracting the impaired signal from the data symbols to be transmitted to form subtracted data symbols, a second transmit filter for filtering the reduced data symbols to form a modulated signal, and means for up-converting the modulated signal to a transmission frequency.

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patent: 2003/0058959 (2003-03-01), Rafie et al.
patent: 2003/0223505 (2003-12-01), Verbin et al.
patent: 1 168 748 (2002-01-01), None
Armstrong, Jean, “New OFDM Peak-to-Average Power Reduction Scheme,” XP-001067062, May 6, 2001, IEEE VTC 2001, pp. 756-760.
Armstrong, J., “Peak-to-average power reduction for OFDM by repeated clipping and frequency domain filtering,” Feb. 28, 2002, Electronics Letter, vol. 36, No. 5.
Chen, Hangium et al., “Iterative Estimation and Cancellation of Clipping Noise for OFDM Signals,” XP-001175968, Jul. 2003, IEEE Communications Letters, vol. 7, No. 7, pp. 305-307.
Ochiai, Hideki, “Power Efficiency Comparison of OFDM and Single-Carrier Signals,” Sep. 24, 2002, IEEE, pp. 899-903.

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