Patent ID: 9736001
Date: 2017-08-15
CPC Classifications: H04L

Claim:
1. A multicarrier radio transmitter for transmitting complex-valued Quadrature Amplitude Modulation (QAM) symbols, the transmitter comprising: at least one delay block for delaying one of a real part or an imaginary part of each respective symbol by half a symbol time thus producing Offset-QAM symbols; at least one non-symmetric conjugate-root filter for pulse-shaping each Offset-QAM symbol, said filter being of the form with H (f) being the transfer function of any Nyquist filter that is band-limited to two subcarriers and wherein the subcarriers are not phase-shifted by ½π, thus producing conjugate-root filtered offset-QAM symbols, and at least one up-converter for converting the conjugate-root filtered Offset-QAM symbols to respective carrier frequencies; a demultiplexer for producing a vector of upconverted conjugate-root filtered Offset-QAM symbols based on a plurality of upconverted conjugate-root filtered symbols, and a radio front-end block to radiate a signal representing the vector of upconverted conjugate-root filtered Offset-QAM symbols.