On Optimum Pilot Design for Comb-Type OFDM Transmission over Doubly-Selective Channels

@article{Islam2011OnOP,
  title={On Optimum Pilot Design for Comb-Type OFDM Transmission over Doubly-Selective Channels},
  author={K. M. Zahidul Islam and Tareq Y. Al-Naffouri and Naofal Al-Dhahir},
  journal={IEEE Transactions on Communications},
  year={2011},
  volume={59},
  pages={930-935}
}
We consider comb-type OFDM transmission over doubly-selective channels. Given a fixed number and total power of the pilot subcarriers, we show that the MMSE-optimum pilot design consists of identical equally-spaced clusters where each cluster is zero-correlation-zone sequence. 

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