Patent ID: 8797837

Claim:
A method of multiplexing signals, the method comprising: receiving a pulse-amplitude modulated (PAM) orthogonal frequency-division multiplexing (OFDM) signal, the OFDM signal being real in frequency domain; receiving a quadrature-amplitude modulated (QAM) cyclic-prefix single-carrier (CP-SC) signal, the CP-SC signal being complex in time domain; inverse transforming the OFDM signal so as to generate an in-phase signal, the in-phase signal being complex in the time domain and real in the frequency domain, wherein the in-phase signal comprises a separate and complete signal; concatenating complex-even and complex-odd portions of the CP-SC signal so as to generate a quadrature signal, the quadrature signal being complex in the time domain and imaginary in the frequency domain, wherein the quadrature signal comprises a separate and complete signal; adding the in-phase signal and the quadrature signal so as to generate a single multiplexed signal; and transmitting the single multiplexed signal, wherein the in-phase signal and the quadrature signal occupy a same time interval and a same frequency band within the single multiplexed signal, and the in-phase signal and the quadrature signal are transmitted simultaneously over the same frequency band in the single multiplexed signal.