Methods and Systems for Modulation Classification

摘要

A method and wireless receiver for determining a modulation format of a transmitted signal from a received signal over a multipath channel are disclosed. The received signal has a frequency offset with respect to the transmitted signal. The wireless receiver down-samples the received signal. The down-sampled signal is equalized in order to mitigate an effect of multipath channel. Then the wireless receiver applies differential processing on the equalized signal to convert the frequency offset into a constant phase offset. Thereafter, values of one or more moment based features for the equalized signal are determined by the wireless receiver. The modulation format of the received signal is then determined based on the values of one or more moment based features.

主权项

1. A method for determining a modulation format of a transmitted signal from a received signal over a multipath channel, wherein the received signal has a frequency offset with respect to the transmitted signal, the method comprising:
in a wireless receiver:
down-sampling the received signal to obtain a second down-sampled signal at a second predefined rate;equalizing the second down-sampled signal in order to mitigate effect of the multipath channel;applying differential processing on the equalized second down-sampled signal to convert the frequency offset into a constant phase offset;determining values of one or more moment based features for the equalized second down-sampled signal; anddetermining the modulation format of the received signal based on the values of one or more moment based features.