Multi-carrier communication system using ciphered carrier bit assignment information
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United States of America Patent
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-
Jul 6, 1993
Grant Date -
N/A
app pub date -
May 14, 1991
filing date -
May 17, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-carrier communication system wherein a sender side apparatus and a receiver side apparatus are connected through a transmission line. The sender side apparatus contains a multi-carrier modulator for modulating data, where preset numbers of bits of the data are respectively modulated with a plurality of carriers in each cycle. The sender side apparatus transmits a training signal which is modulated by the multi-carrier modulating unit where the numbers are set equal to a predetermined maximum of the numbers, to the receiver side apparatus. The receiver side apparatus evaluates the quality of components of the training signal where the components are modulated with the respective carriers to determine the above numbers to be preset, ciphers information on the numbers, and transmits the ciphered information to the sender side apparatus. The sender side apparatus deciphers the information to obtain the determined numbers, and presets the numbers in a multi-carrier demodulator which is provided therein.
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