Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2006-09-05
2006-09-05
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07103111
ABSTRACT:
An improved multicarrier modulation system and method, which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM) and scalable advanced modulation (SAM), is introduced. The invention is root raised cosine (RRC) OFDM using the most spectrally efficient RRC filter without sacrificing the compact subchannel spacing of OFDM. The invention further provides an adjacent channel interference (ACI) suppression scheme and a modified RRC for better suppressing ACI of RRC OFDM. The ACI suppression scheme can also be applied to SAM with the modified RRC and to IOTA OFDM with a modified IOTA. The invention greatly improves a major problem of conventional OFDM namely ACI due to the use of a wide subchannel filter. Thus, the invention allows OFDM to meet even the strictest ACI requirements, which was not possible by using a conventional raised cosine windowing method.
REFERENCES:
patent: 5233628 (1993-08-01), Rappaport et al.
patent: 5386495 (1995-01-01), Wong et al.
patent: 5420887 (1995-05-01), Rhodes et al.
patent: 6128350 (2000-10-01), Shastri et al.
patent: 6269132 (2001-07-01), Yonge, III
patent: 2003/0021237 (2003-01-01), Min et al.
patent: 2003/0174784 (2003-09-01), Samarasooriya et al.
patent: 2003/0179766 (2003-09-01), Azadet
patent: 2004/0141548 (2004-07-01), Shattil
patent: 0 849 919 (1998-06-01), None
Alagha et al. (hereinafter, Alagha), “Generalized Raised-Cosine Filters”, IEEE Transactions on Commuications, vol. 47, No. 7, Jul. 1999, pp. 989-997.
O Serna , “On the Use of Amplitude Shaping Pulses as Windows for Harmonic Analysis”, IEEE Transactions on Instrumentation and Measurement, vol. 50, No. 6, Dec. 2001, pp. 1156-1562.
Schiff, “Baseband Pulse Shaping for Improved Spectral Efficiency”, Application Note AN131, System View, Mar. 3, 2000.
W. Y. Zou, Y. Wu, “CODFM: An Overview,” IEEE Transactions on Broadcasting, vol. 41, No. 1, Mar. 1995, pp. 1-8.
B. Le Floch, M. Alard, C. Berrou, “Coded Orthogonal Frequency Division Multiplex,” Preceedings of the IEEE, Vo. 83, No. 6, Jun. 1995, pp. 982-996.
Conventional Modified IOTA Pulse with a Half Gaussian Pulse Shape: EADS-DSN, “TEDS Modulation Layer Proposal,” EPSI EPT WG4 (01) 061, Jul. 2, 2001, pp. 1-12.
“Wideband Air Interface Scalable Adaptive Modulation (SAM) Physical Layer Specification Public Safety Wideband Data Standards Project Digital Radio Technical Standards,” TIA-902.BAAB, Feb. 2002.
Bocure Tesfaldet
Motorola Inc.
Panwalkar Vineeta
LandOfFree
System and method for generating a spectral efficient root... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for generating a spectral efficient root..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for generating a spectral efficient root... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3579205