| 摘要 |
A digitally modulated signal is conditioned, such as to facilitate amplification (500). The digitally modulated signal is derived from a digital information stream which is mapped onto a symbol constellation to generate a sequence of channel symbols. From a signal envelope representing the sequence of channel symbols, signal envelope minimum values are determined for the signal envelope as it transitions through successive channel symbols of the sequence (510). A modified sequence of channel symbols is generated by adjusting at least some channel symbols of the sequence, preferably based on response characteristics of a spectral shaping filter, to avoid signal envelope minimum values below a threshold value, thereby conditioning the digitally modulated signal (515, 520, 530, 540, 545, 555).
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