Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-08-02
2011-08-02
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S142000, C375S143000, C375S145000, C375S146000, C375S246000, C375S365000, C375S366000, C375S367000, C370S335000, C370S280000, C370S342000, C370S514000, C370S515000, C380S268000
Reexamination Certificate
active
07991040
ABSTRACT:
Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.
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Krishnamoorthi Raghuraman
Ling Fuyun
van Veen Durk L.
Ahn Sung
Farr Ryan
Ghayour Mohammad H
Qualcomm Incorporated
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