Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2011-08-16
2011-08-16
Puente, Eva (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S350000, C375S242000, C370S210000
Reexamination Certificate
active
08000398
ABSTRACT:
A method of time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) communication, including the steps of: preparing OFDM-body; generating pseudo random (PN) sequence as a training signal; manipulating the PN sequence to concentrate the energy distribution thereof to the same bandwidth of sub-carriers of the OFDM-body; offsetting the manipulated PN sequence to align with frequency spectrum of the sub-carriers; and inserting the offset PN sequence as prefix of a TDS-OFDM data frame. The manipulating step may include the step of repeating the PN sequence by N times, wherein the spectrum of the repeated PN sequence concentrates on discrete bundles of sub-carriers, i.e., on one sub-carrier every N sub-carriers or M adjacent sub-carriers every MN sub-carriers, where M is an integer determined by the time duration ratio of the OFDM body and prefix. Alternatively, the manipulating step may include the step of expanding the PN sequence by N times, wherein the spectrum of the expanded PN sequence concentrates on a block of continual adjacent sub-carriers, the bandwidth of the PN sequence is 1/N of the whole bandwidth.
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Chan Wing Chau
Lo Chi Ming
Pan Zhengang
Zhao XueYuan
Burke Margaret
Ella Cheong Hong Kong
Hong Kong Applied Science and Technology Research Institute Comp
Puente Eva
Yip Sam T.
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