Zero tail and unique word based waveforms for dft-s ofdm and ofdm

A wireless transmit/receive unit (WTRU) comprising:

• an antenna;
• and
• a processor operatively coupled to the antenna, the processor configured to receive modulated data symbols and zeros in a frequency-domain;
• the processor further configured to map, in the frequency-domain, the modulated data symbols and zeros in an interleaved manner to sub-carriers within a resource allocation;
• the processor further configured to generate a time-domain data signal based on the mapped sub-carriers;
• the processor further configured to generate a time domain cancellation signal by sign inverting and repeating a predetermined number of time-domain samples at a tail portion of the data signal;
• the processor further configured to combine the time-domain data signal and the time domain cancellation signal to generate an exact zero tail data signal, wherein the exact zero tail data signal has a zero tail length equal to the predetermined number of time-domain samples;
• and
• the processor and the antenna configured to transmit the exact zero tail data signal.