Communication with i-q decoupled ofdm modulation

An apparatus comprising:

• a receiver configured to:
• receive a received time-domain sequence that is responsive to a transmitted time-domain sequence transmitted by a transmitter, the transmitted time-domain sequence comprising an in-phase component that is a function of a first frequency-domain subsequence that has an inserted zero element, and a quadrature-phase component that is a function of a second frequency-domain subsequence that has an inserted zero element;
• determine a phase offset of an in-phase component of the transmitted time-domain sequence;
• separately determine a phase offset of a quadrature-phase component of the transmitted time-domain sequence;
• and
• compute a frequency-domain sequence corresponding to the transmitted time-domain sequence using the determined phase offset of the in-phase component of the transmitted time-domain sequence and the determined phase offset of the quadrature-phase component of the transmitted time-domain sequence.

A method comprising:

• applying, by a transmitter, an input data sequence as a frequency-domain data sequence to modulate a set of subcarriers;
• separating, by the transmitter, the frequency-domain data sequence into a first subsequence and a second subsequence;
• inserting, by the transmitter, a value of zero into the first subsequence to form a modified first subsequence, and inserting a value of zero into the second subsequence to form a modified first subsequence, the zero values inserted at different positions in the first and second subsequences;
• extending, by the transmitter, the modified first subsequence to a first conjugate symmetric subsequence, and extending the modified second subsequence to a second conjugate symmetric sequence;
• and
• generating, by the transmitter, a time-domain sequence of complex numbers, the time-domain sequence comprising a real component that is a function of the first conjugate symmetric subsequence, and an imaginary component that is a function of the second conjugate symmetric subsequence.