Modified OFDM subcarrier profile

Details Modified OFDM subcarrier profile Modified OFDM subcarrier profile

2007-09-18

2007-09-18

Kincaid, Lester G. (Department: 2617)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S343000, C370S295000, C370S203000, C370S344000, C370S480000, C375S260000

Reexamination Certificate

active

10927487

ABSTRACT:
A 10 MHz channelized orthogonal frequency division multiplexing (OFDM) transmitter is provided that communicates using a modified OFDM packet structure with a half-rate oscillator having standard accuracy. The transmitter has an inverse fast fourier transform (IFFT) data processor that appends an outer pair of data subcarriers on either end of an OFDM subcarrier profile. An IFFT long sync processor appends an outer pair of binary phase shift key (BPSK) subcarriers on either end of an OFDM long sync subcarrier profile. By copying or appending the information of the data subcarriers closest to zero Hz. to more robust locations, 10 MHz channelized OFDM can be achieved with half-rate clocks and 20 PPM oscillators.

REFERENCES:
patent: 6424678 (2002-07-01), Doberstein et al.
patent: 6721267 (2004-04-01), Hiben et al.
patent: 2003/0090993 (2003-05-01), Sato

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