Multiplex communications – Communication over free space – Combining or distributing information via frequency channels
Reexamination Certificate
2011-04-19
2011-04-19
Moe, Aung S (Department: 2474)
Multiplex communications
Communication over free space
Combining or distributing information via frequency channels
C370S208000, C370S210000, C370S281000, C370S295000, C370S319000, C370S343000, C370S480000, C455S059000, C375S260000, C375S279000, C375S308000, C708S404000
Reexamination Certificate
active
07929511
ABSTRACT:
The present invention discloses a method of producing a multi-layered OFDM symbol using a plurality of small IFFT blocks. The produced OFDM symbol is able to reduce complexity in performing IFFT or FFT while maintaining orthogonality of a related art OFDM symbol. In particular, by avoiding the related art scheme using the N-sized IFFT, the layered IFFT is executed in a manner of grouping N data symbols into P groups each of which includes Q data symbols (N=P−Q). In order to produce an OFDM signal equal to that of the related art N-sized IFFT, it is preferable that phases are aligned for the data symbols on which Q-sized IFFT has been performed.
REFERENCES:
patent: 2003/0067866 (2003-04-01), Jung
patent: 2003/0202460 (2003-10-01), Jung et al.
patent: 2006/0002361 (2006-01-01), Webster et al.
patent: 2006/0224651 (2006-10-01), Madhavapeddi et al.
patent: 2006/0268675 (2006-11-01), Cho et al.
patent: 1449166 (2003-10-01), None
patent: 1522511 (2004-08-01), None
patent: 8-228186 (1996-09-01), None
patent: 2001-186104 (2001-07-01), None
Dae-Woon Lim et al., “A PTS OFDM Scheme with Low Computational Complexity,” International Symposium Proceedings on Information Theory, pp. 1141-1144, Sep. 2005.
Dae-Woon Lim et al., “A New SLM OFDM Scheme With Low Complexity for PAPR Reduction,” IEEE Signal Processing Letters, vol. 12, No. 2, pp. 93-96, Feb. 2005.
Han Seung Hee
Kwon Yeong Hyeon
Noh Min Seok
Yun Young Woo
Chung Hoon J
Lee Hong Degerman Kang & Waimey
LG Electronics Inc.
Moe Aung S
LandOfFree
Method and apparatus for producing/recovering OFDM/OFDMA... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for producing/recovering OFDM/OFDMA..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for producing/recovering OFDM/OFDMA... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2731582