Pulse or digital communications – Transmitters
Reexamination Certificate
2005-07-19
2005-07-19
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Transmitters
C370S208000
Reexamination Certificate
active
06920184
ABSTRACT:
The transmission system according to the invention comprises a transmitter (10) and a receiver (1 2). The transmitter (10) can transmit datawords via a multicarrier signal (11) to the receiver (12). In order to reduce the crest factor of this multicarrier signal (11) the transmitter (10) comprises a generator (20) and a selector (22). The generator (20) generates for each dataword (19) a number of alternative sequences (21) by combining mutually different digital words with the dataword (19). For this purpose, the generator (20) include an augmentor (40) and a scrambler (42). The augmentor (40) generates for each dataword (19) a number of intermediate sequences (41) by combining the digital words with the dataword (19). These intermediate sequences (41) are scrambled by the scrambler (42) in order to form the alternative sequences (21). From these alternative sequences (21) the alternative sequence with the lowest peak power value (23) is selected for transmission to the receiver (12).
REFERENCES:
patent: 5710990 (1998-01-01), Long et al.
patent: 6125103 (2000-09-01), Bauml et al.
patent: 0942566 (1999-09-01), None
patent: 9810567 (1998-03-01), None
Peak to Average Power Reduction for OFDM Schemes by Selective Scrambling, by P. Van Eetvelt, Electronics Letters, Oct. 1996, vol. 32, No. 21, XP 000683518.
A Comparison of Peak Power Reduction Schemes for OFDM by Stefan H. Miller et al., IEEE 1997, XP 000737500.
Reducing the Peak to Average Power Ratio of Multicarrier Modulation by Selected Mapping, by R.W. Bauml et al, Electronics Letters, Oct. 1996, vol. 32, No. 22, XP 000643915.
Bocure Tesfaldet
Koninklijke Philips Electronics , N.V.
Kumar Pankaj
Petersen Steven R.
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