| 摘要 |
A multicarrier transmission system uses a set of carriers spaced apart in frequency with a number of bits being assigned to each carrier. A transmitter has an input for receiving a data signal (2) for transmission and a mapper (14) arranged to map the received data signal into a set of complex data symbols, wherein each data symbol determines modulation of one carrier in a set of carriers which are spaced in frequency. A frequency domain-to-time domain transform stage (18) is arranged to convert the set of modulated carriers to a time-domain signal. A peak detector (26) arranged to detect when the time-domain signal exceeds a predetermined criterion. A constellation modifier (27) arranged to modify the constellation value of at least one of the carriers in the converted time-domain signal.
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