Referenced Items are not available for this document.
In this letter, we investigate the deterministic pilot allocation for sparse channel estimation in OFDM systems. Based on the rule of minimizing the coherence of the DFT submatrix, we derive that the pilot design according to the cyclic different set (CDS) is optimal. However, the CDS only exists for some specific number of OFDM subcarriers. For those cases where the CDS is unavailable, we propose a scheme using discrete stochastic approximation to obtain a near-optimal pilot pattern. Simulation results demonstrate that our scheme is much faster convergent and more efficient than the exhaustive search; and it has been shown that substantial improvement for channel estimation can be achieved.
Published in:
Communications Letters, IEEE
(Volume:16
,
Issue:
5
)
Date of Publication: May 2012
- Page(s):
- 742 - 744
- ISSN :
- 1089-7798
- INSPEC Accession Number:
- 12713328
- Digital Object Identifier :
- 10.1109/LCOMM.2012.032612.112553
- Product Type:
- Journals & Magazines
- Date of Publication :
- 03 April 2012
- Date of Current Version :
- 11 May 2012
- Issue Date :
- May 2012
- Sponsored by :
- IEEE Communications Society
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