Method and apparatus for PAPR reduction of an OFDM signal

Details Method and apparatus for PAPR reduction of an OFDM signal Method and apparatus for PAPR reduction of an OFDM signal

2004-06-02

2008-03-11

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Transmitters

C375S297000, C370S210000

Reexamination Certificate

active

07342978

ABSTRACT:
An apparatus and a method for peak-to-average power ratio reduction of an OFDM signal are disclosed. The method uses the interleaved characteristics of partial transmit sequences to partition input data x[n] of length N into several disjoint subblocks in time domain, and a complete N-point signal {tilde over (x)}[n] is composed after phase optimization, where N is the length of an OFDM signal and n=0, 1, . . . , N−1. Accordingly, the apparatus comprises an N-point inverse fast Fourier transform (N-IFFT), a de-multiplexer, a combiner, a set of memory and an adder. This invention uses only one N-IFFT, whereby it can achieve significant computation reduction. This invention requires (N/2)log2N complex multiplications and N memory units. It also preserves the inherent property as well as advantages of an OFDM system.

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