H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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H04L27/00
Modulated-carrier systems
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H04L27/26
Systems using multi-frequency codes
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H04L27/2601
Multicarrier modulation systems
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H04L27/2602
Signal structure
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H04L27/261
Details of reference signals
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H04L27/2613
Structure of the reference signals
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