Methods, apparatuses and systems directed to unique word discrete fourier transform spread and shaped orthogonal frequency division multiplexing based transmissions

A transmitter comprising a discrete Fourier transform (DFT) unit, a processing unit and an inverse DFT (IDFT) unit, wherein:

• the DFT unit is configured to transform a set of data symbols and a unique word (UW) sequence into a frequency domain (“fDOM”) signal using a DFT;
• the processing unit is configured to:
• replicate the fDOM signal so as to form a plurality of fDOM signal instances, wherein the plurality of fDOM signal instances is inclusive of the fDOM signal;
• shape each of the plurality of fDOM signal instances;
• combine the plurality of fDOM signal instances to form a combined fDOM signal;
• and
• the IDFT unit is configured to:
• transform the combined fDOM signal into a block-based signal using an IDFT;
• and
• output the block-based signal.

A method implemented in transmitter comprising:

• transforming a first set of data symbols and a first unique word (UW) sequence into a first frequency domain (“fDOM”) signal using a first discrete Fourier transform (DFT);
• replicating the first fDOM signal so as to form a plurality of first fDOM signal instances, wherein the plurality of first fDOM signal instances is inclusive of the first fDOM signal;
• shaping each of the plurality of first fDOM signal instances;
• combining the plurality of first fDOM signal instances to form a first combined fDOM signal;
• transforming a second set of data symbols and a second UW sequence into a second fDOM signal using a second DFT;
• replicating the second fDOM signal so as to form a plurality of second fDOM signal instances, wherein the plurality of second fDOM signal instances is inclusive of the second fDOM signal;
• shaping each of the plurality of second fDOM signal instances;
• combining the plurality of second fDOM signal instances to form a second combined fDOM signal;
• adding the first combined fDOM signal and the second combined fDOM signal to form a third fDOM signal;
• transforming the third fDOM signal into a block-based signal using an inverse DFT (IDFT);
• and
• outputting the block-based signal.