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We analyze the error performance of a space-time coding system using N transmit and M receive antennas with imperfect channel estimation in flat Rayleigh fading. A least-squares estimate of the channel matrix is obtained by using a sequence of pilot code vectors. The estimate is found to be perturbed by an M×N perturbation matrix with zero-mean circular Gaussian entries. Using the characteristic function of the decision variable, we derive a closed-form expression for the pairwise error probability (PEP). From the same expression, the PEP in case of perfect channel estimation is also obtained. Numerical results show the degradation in performance due to imperfect channel estimation that can be compensated by increasing the number of receive antennas.
Published in:
Wireless Communications, IEEE Transactions on
(Volume:4
,
Issue:
1
)
Date of Publication: Jan. 2005
- Page(s):
- 257 - 265
- ISSN :
- 1536-1276
- INSPEC Accession Number:
- 8258774
- Digital Object Identifier :
- 10.1109/TWC.2004.840202
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 17 January 2005
- Issue Date :
- Jan. 2005
- Sponsored by :
- IEEE Communications Society
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