Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1993-11-19
1996-04-02
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375347, 455101, 370121, 371 371, H04B 702
Patent
active
055047831
ABSTRACT:
A frequency diversity communication system is provided whereby the number of hopping channels is reduced and a more continuous communication achieved as a mobile station travels from cell to cell by the combination of chips of symbols from the mobile sources. The transmitter divides each symbol of an input symbol sequence into a number K of chips, which are modulated with mutually different carrier frequencies. The receiver demodulates the signal sent by the transmitter by local frequencies corresponding respectively to the K different carrier frequencies. According to this invention, the carrier phase is coherent for each frequency of the received wave. Moreover, because the carrier phase is coherent, the outputs for each frequency of the received wave can be combined with the use of a training signal. The receiver also performs an estimation of the maximum likelihood of the transmitted symbol to eliminate the need for decoding. It is also provided that the order of the chips of the symbols is rearranged within a burst.
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"Digital Communications Fundamentals and Applications" Bernard Sklar, pp. 555-562, 1988.
"Digital Communications and Spread Spectrum System" Liemer et al, pp. 348-355, 1985.
Suzuki Hiroshi
Tomisato Shigeru
Chin Stephen
Ghebretinsae T.
NTT Mobile Communication Network Inc.
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