What is the price paid for superimposed training in OFDM?

Ning Chen, G. Tong Zhou. What is the price paid for superimposed training in OFDM?. In 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2004, Montreal, Quebec, Canada, May 17-21, 2004. pages 421-424, IEEE, 2004. [doi]

@inproceedings{ChenZ04a-1,
  title = {What is the price paid for superimposed training in OFDM?},
  author = {Ning Chen and G. Tong Zhou},
  year = {2004},
  doi = {10.1109/ICASSP.2004.1326853},
  url = {http://dx.doi.org/10.1109/ICASSP.2004.1326853},
  researchr = {https://researchr.org/publication/ChenZ04a-1},
  cites = {0},
  citedby = {0},
  pages = {421-424},
  booktitle = {2004 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2004, Montreal, Quebec, Canada, May 17-21, 2004},
  publisher = {IEEE},
  isbn = {0-7803-8484-9},
}