Frequency Domain Channel Estimation for MIMO SC-FDMA Systems with CDM Pilots
SCIE
SCOPUS
KCI
- Title
- Frequency Domain Channel Estimation for MIMO SC-FDMA Systems with CDM Pilots
- Authors
- Kim, HM; Kim, DS; Kim, TK; Im, GH
- Date Issued
- 2014-08
- Publisher
- KOREAN INST COMMUNICATIONS SCIENCES (K I C S)
- Abstract
- In this paper, we investigate the frequency domain channel estimation for multiple-input multiple-output (MIMO) single-carrier frequency-division multiple-access (SC-FDMA) systems. In MIMO SC-FDMA, code-division multiplexed (CDM) pilots such as cyclic-shifted Zadoff-Chu sequences have been adopted for channel estimation. However, most frequency domain channel estimation schemes were developed based on frequency-division multiplexing of pilots. We first develop a channel estimation error model by using CDM pilots, and then analyze the mean-square error (MSE) of various minimum MSE (MMSE) frequency domain channel estimation techniques. We show that the cascaded one-dimensional robust MMSE (C1D-RMMSE) technique is complexity-efficient, but it suffers from performance degradation due to the channel correlation mismatch when compared to the two-dimensional MMSE (2D-MMSE) technique. To improve the performance of C1D-RMMSE, we design a robust iterative channel estimation (RITCE) with a frequency replacement (FR) algorithm. After deriving the MSE of iterative channel estimation, we optimize the FR algorithm in terms of the MSE. Then, a low-complexity adaptation method is proposed for practical MIMO SC-FDMA systems, wherein FR is performed according to the reliability of the data estimates. Simulation results show that the proposed RITCE technique effectively improves the performance of C1D-RMMSE, thus providing a better performance-complexity tradeoff than 2D-MMSE.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14224
- DOI
- 10.1109/JCN.2014.000075
- ISSN
- 1229-2370
- Article Type
- Article
- Citation
- JOURNAL OF COMMUNICATIONS AND NETWORKS, vol. 16, no. 4, page. 447 - 457, 2014-08
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