Phase shifters for peak-to-average power ratio reduction in...

Details Phase shifters for peak-to-average power ratio reduction in... Phase shifters for peak-to-average power ratio reduction in...

2006-06-06

2006-06-06

Bocure, Tesfaldet (Department: 2631)

Pulse or digital communications

Transmitters

C375S316000, C370S210000

Reexamination Certificate

active

07058137

ABSTRACT:
In accordance with the present invention, there are provided peak-to-average power ratio optimal phase shifters for multi-carrier communications. An optimal shifter is shown to be a complex, constant envelope sequence mapped by a multi-tone transformation used to another complex, constant envelope sequence. In the case of the inverse discrete Fourier transform being the multi-tone transformation, a family of principal shifters of the form z(r)=exp(±j*π*p*r2/q), where j2=−1, 0≦r<q, q is a number of subcarriers, and p and q are mutually prime integers of different parity, has been analytically constructed. These phase shifters outperform the best existing phase shifter by as much as 2.6 dB.

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