Pulse or digital communications – Systems using alternating or pulsating current – Amplitude modulation
Reexamination Certificate
2006-06-20
2006-06-20
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Systems using alternating or pulsating current
Amplitude modulation
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.
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Ghebretinsae Temesghen
Motorola Inc.
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