Apparatus and method for reducing peak-to-average power...

Details Apparatus and method for reducing peak-to-average power... Apparatus and method for reducing peak-to-average power...

2007-11-27

2007-11-27

Yao, Kwang Bin (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S343000

Reexamination Certificate

active

10776364

ABSTRACT:
A transmitter apparatus and method for reducing PAPR in an OFDM system. The transmitter apparatus performs a masking process on an input signal block using a plurality of mask sequences in an OFDM system, and selects a specific sequence having a lowest PAPR among IFFT-processed results. The apparatus includes a single IFFT for performing an IFFT process on the received signal block, and generating an IFFT-processed sequence; a plurality of shift registers for storing individual bits of the IFFT-processed sequence, cyclically shifting them, and generating the cyclically-shifted bits; a plurality of multiplier groups for multiplying coefficients determined by corresponding mask sequences by the output bits of the shift registers; and a plurality of adders corresponding to the plurality of multiplier groups for adding the multiplied results of the multiplier groups, thereby reducing system complexity and production costs.

REFERENCES:
patent: 6125103 (2000-09-01), Bauml et al.
patent: 2001/0022777 (2001-09-01), Bourget et al.
patent: 2002/0150036 (2002-10-01), Weerackody
patent: 2003/0067866 (2003-04-01), Jung
patent: 2003/0202460 (2003-10-01), Jung et al.
patent: 2003/0227867 (2003-12-01), Xiong

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