Zero insertion for ISI free OFDM reception

A wireless communication apparatus comprising at least one processor, and at least one memory including a computer program code, the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

• obtain, by a processor within a first communication device, a vector of data symbols;
• generate, by the processor, a zero-tail or very low power-tail data signal to be transmitted in a cell of a wireless communications network by multiplying the vector of data symbols with a matrix before an inverse fast Fourier transform (IFFT), wherein the matrix causes the output of the IFFT to include time domain samples with zero power or very low power in specific positions but not all positions of a time symbol tail;
• the causing the apparatus to generate the zero-tail or very low power tail data signal, by the processor, further includes causing the apparatus to copy at least one of the samples of the time symbol tail and placing the at least one copied sample to before the time symbol tail;
• control, by the first communication device, the amount of zero power or very low power samples through the matrix;
• and
• transmit, by the first communication device, the generated zero-tail or very low power-tail data signal to a second communication device in the wireless communications network.

A method for providing a signal in a communication device within a wireless communications network, the method comprising:

• obtaining, by a processor within a first communication device, a vector of data symbols;
• generating, by the processor, a zero-tail or very low power-tail data signal to be transmitted in a cell of the wireless communications network by multiplying the vector of data symbols with a matrix before an inverse fast Fourier transform (IFFT), wherein the matrix causes the output of the IFFT to include time domain samples with zero power or very low power in specific positions but not all positions of a time symbol tail;
• the generating the zero-tail or very low power tail data signal, by the processor, further includes performing a cyclic-prefix operation that copies at least one of the samples of the time symbol tail and concatenates the at least one copied sample to a beginning of the time symbol;
• controlling, by the first communication device, the amount of zero power or very low power samples through the matrix;
• and
• transmitting, by the first communication device, the generated zero-tail or very low power-tail data signal to a second communication device in the wireless communications network.