I am working on the OFDM transmission system. A channel is given, MR x MT; input data MT x S, and length of a cyclic prefix (CP).

MR - received antenna, MT- transmit antenna, S streams

1) According to the theory, the input data is split alongS. As a result, IFFT is applied for the vectors MT x 1 and CP is added. How can I apply the channel matrix ( $H\cdot data$), for each vector or first the vectors are grouped and then the channel is applied?



Thank you in advance!


  • $\begingroup$ You need to treat the transmitted signal from each antenna separately. The matrix form is just a mathematical convenient way of representing the underlying physical process. $\endgroup$ – BlackMath Oct 19 '19 at 1:06
  • $\begingroup$ @BlackMath If an input data is given as matrix MT X S, it means S/P split the input data to MT blocks, doesn't? $\endgroup$ – Noel Miller Oct 23 '19 at 17:32
  • $\begingroup$ Are you using the transmit antennas for spatial multiplexing? $\endgroup$ – BlackMath Oct 23 '19 at 18:50
  • $\begingroup$ @BlackMath I think, yes $\endgroup$ – Noel Miller Oct 24 '19 at 6:20
  • $\begingroup$ @BlackMath I would like to demultiplex among MT, and then for each block to take ifft, +cp $\endgroup$ – Noel Miller Oct 24 '19 at 8:51

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