System and method for generating a root raised cosine...

Pulse or digital communications – Systems using alternating or pulsating current – Amplitude modulation

Reexamination Certificate

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C375S146000, C375S300000, C370S208000

Reexamination Certificate

active

07065150

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: 6934246 (2005-08-01), Park
patent: 2004/0141548 (2004-07-01), Shattil
patent: 0 849 919 (1998-06-01), None
“Iterative Multiuser Detection for Turbo-Coded FHMA Communications” Liang et al. IEEE 2001 p. 1810-1819.
“Generalized Raised-Cosine Filters” Alagh et al. IEEE 1999 p. 989-997.
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,” Proceedings 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.

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