Processing of an OFDM signal

Details Processing of an OFDM signal Processing of an OFDM signal

2004-12-09

2008-03-18

Anderson, Matthew (Department: 2618)

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

C370S344000, C375S260000, C375S261000, C375S285000, C375S296000

Reexamination Certificate

active

07346041

ABSTRACT:
The invention relates to an OFDM-transmitter, comprising means for transforming (400) data to be transmitted in frequency-to-time transformation to a basic waveform containing waveform components representing subbands of the spectrum of the signal. The transmitter comprises means for forming (402) at least one alternative waveform from components of the basic waveform, where at least one component in the alternative waveform is delayed in time, and means for selecting (414) a waveform for transmission from the group of waveforms, containing the basic waveform and the at least one alternative waveform. The invention also relates to a method for transmitting an OFDM signal, a method for processing an OFDM signal and an OFDM signal processing arrangement.

REFERENCES:
patent: 7088782 (2006-08-01), Mody et al.
patent: 1 139 625 (2001-10-01), None
Hill G. et al.; “Cyclic Shifting And Time Inversion Of Partial Transmit Sequences To Reduce The Peak-To-Average Power Ratio In OFDM”, IEEE, Sep. 18-21, 2000, pp. 1256-1259.
Müller, S. et al.; “A Comparison Of Peak Power Reduction Schemes For OFDM”, IEEE 1997, pp. 1-5.
Zekri, M. et al.; “Peak-To-Average Power Reduction For Multicarrier”, IEEE ICT 2001, Jun. 4-7, 2001, pp. 1-4.

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