NDLI: Performance of decision-directed channel estimation using low-rate turbo codes for OFDM

Content Provider	IEEE Xplore Digital Library
Author	Miwa, K. Miki, N. Sawahashi, M.
Copyright Year	2011
Description	Author affiliation: Research Laboratories, NTT DOCOMO, INC., Japan (Miki, N.) \|\| Department of Information Network Engineering, Tokyo City University, Japan (Miwa, K.; Sawahashi, M.)
Abstract	A low-rate turbo code can reduce the required average received signal-to-noise power ratio (SNR) that satisfies the target block error rate (BLER) due to its high coding gain. When a low-rate turbo code is used however, channel estimation (CE) error becomes a bottleneck in bringing out the potential coding gain. Therefore, this paper presents the average BLER performance using decision-directed channel estimation (DDCE) for a low-rate turbo code in orthogonal frequency division multiplexing (OFDM). In the proposed DDCE, we employ soft-decision symbol estimation based on the log-likelihood ratio (LLR) of an extrinsic probability at the Max-Log-MAP (maximum a posteriori probability) decoder output in addition to reference signals (RSs). The DDCE works synergistically with the low-rate turbo code, since the extrinsic LLR at the Max-Log-MAP decoder becomes more reliable due to the increasing coding gain. Computer simulation results show that when the turbo code with R = 1/15 (1/9) and the constraint length of K = 4 bits is used, the required average received SNR at the average BLER of $10^{−2}$ using the DDCE is decreased by approximately 1.2 (1.2) dB compared to that for the RS based CE. As a result, the required average received SNR using the DDCE for R = 1/15 and 1/9 is decreased by approximately 6.0 and 4.4 dB, respectively, compared to that for R = 1/3.
Starting Page	1
Ending Page	5
File Size	1108482
Page Count	5
File Format	PDF
ISBN	9781457721656
e-ISBN	9781457721663
DOI	10.1109/ISPACS.2011.6146183
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-12-07
Publisher Place	Thailand
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article

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