Patent ID: 8798196

Claim:
A method comprising: (a) modulating a set of subcarriers with a set of data to produce a modulated OFDM symbol vector; (b) modulating a FM carrier signal with the set of data to produce a modulated FM symbol; (c) combining the modulated OFDM symbol and the modulated FM symbol to produce a modulated hybrid symbol; (d) limiting the magnitude of the modulated hybrid symbol to produce a first limited modulated hybrid symbol; (e) demodulating the first limited modulated hybrid symbol to recover distorted QPSK constellations; (f) constraining the distorted QPSK constellations recovered from the first limited modulated hybrid symbol to values greater than or equal to a minimum threshold value to produce constrained QPSK constellations in a hybrid symbol vector; (g) demodulating the modulated FM symbol to produce an FM symbol vector; (h) subtracting the FM symbol vector from the hybrid symbol vector to produce a modified OFDM symbol vector; (i) applying a mask to inactive subcarriers in the plurality of subcarriers of the OFDM symbol vector; (j) modulating an OFDM symbol vector with OFDM modulation to produce a modified modulated OFDM symbol; (k) combining the modified modulated OFDM symbol and the modulated FM symbol to produce a modified modulated hybrid symbol; and (l) outputting the modified modulated hybrid symbol.