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For DFT-spread-OFDM or OFDM, if the delay spread varies in a wide range andthe symbol duration is relatively short, adapting the cyclic prefix (CP)duration rather than using a fixed one may significantly improve the spectralefficiency while preventing inter-symbol interference (ISI). In practice, itmay be beneficial to have a constant overall DFT-spread-OFDM/OFDM symbol time,which is the sum of the duration of a CP and the duration of a data portion. Wepropose to adapt the CP duration to the delay spread without changing theoverall symbol time for DFT-spread-OFDM or OFDM, and address implementationchallenges. In particular, we propose changing the clocking rate of ADC and DACor using a Farrow filter to reduce the computational complexity ofarbitrary-size DFT/IDFT resulting from the adaptation.

Cyclic Prefix Adaptation with Constant Overall Symbol Time for DFT-spread-OFDM and OFDM