Peak-to-average power reduction in an orthogonal frequency...

Details Peak-to-average power reduction in an orthogonal frequency... Peak-to-average power reduction in an orthogonal frequency...

2005-09-27

2005-09-27

Ho, Duc (Department: 2665)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S203000

Reexamination Certificate

active

06950389

ABSTRACT:
An Orthogonal Frequency Division Multiplexing (OFDM) transmission utilizes random phases across the OFDM sub-carrier components and differential encoding so that the phase information (i.e., phase values) does not have to be explicitly transmitted to a receiver. The OFDM data symbols are differentially encoded so that the phase information on the symbols that are multiplied together in the differential encoder is the same. Assuming use of a differential phase shift keying (DPSK) system, a phase sequence is used having “V” random phase values, where θn,kis the phase value in the nthsub-carrier in the kthOFDM symbol and is periodic in n with V as the period. A current input symbol is then differentially encoded relative to the Vthprevious encoded output from the encoder so that the phase values on the symbols multiplied together in the differential encoding process are the same.

REFERENCES:
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S.H. Muller et al., “OFDM with Reduced Peak-to-Average Power Ratio by Optimum Combination of Partial Transmit Sequences”,Electronic Letters, vol. 33, pp. 368-369, Feb. 1997.
D.J.G. Mestdagh et al., “A Method to Reduce the Probability of Clipping in DMT-Based Transceivers”,IEEE Transactions on Comminications, vol. 44, pp. 1234-1238, Oct. 1996.

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