NDLI: Time domain synchronous OFDM based on simultaneous multi-channel reconstruction

Content Provider	IEEE Xplore Digital Library
Author	Linglong Dai Jintao Wang Zhaocheng Wang Tsiaflakis, P. Moonen, M.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. Eng. (ESAT-SCD), Katholieke Univ. Leuven (KUL), Leuven, Belgium (Tsiaflakis, P.; Moonen, M.) \|\| Tsinghua Nat. Lab. for Inf. Sci. & Technol., Tsinghua Univ., Beijing, China (Linglong Dai; Jintao Wang; Zhaocheng Wang)
Abstract	Time domain synchronous OFDM (TDS-OFDM) can achieve a higher spectrum efficiency than standard cyclic prefix OFDM (CP-OFDM). Currently, it can support constellations up to 64QAM, but cannot support higher-order constellations like 256QAM due to the residual mutual interferences between the pseudorandom noise (PN) guard interval and the OFDM data block. To solve this problem, we break the traditional approach of iterative interference cancellation and propose the idea of using multiple inter-block-interference (IBI)-free regions of very small size to realize simultaneous multi-channel reconstruction under the framework of structured compressive sensing, whereby the sparsity nature of wireless channels as well as the characteristic that path delays vary much slower than path gains are jointly exploited. In this way, the mutually conditional time-domain channel estimation and frequency-domain data demodulation in TDS-OFDM can be decoupled without the use of IBI removal. We then propose the adaptive simultaneous orthogonal matching pursuit (A-SOMP) algorithm with low complexity to realize accurate multi-channel reconstruction, whose performance is close to the Cramér-Rao lower bound (CRLB). Simulation results confirm that the proposed scheme can support 256QAM without changing the current signal structure, so the spectrum efficiency can be increased by about 30%.
Starting Page	2984
Ending Page	2989
File Size	186793
Page Count	6
File Format	PDF
ISBN	9781467331227
ISSN	15503607
DOI	10.1109/ICC.2013.6654997
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-09
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Channel estimation Delays Vectors Time-domain analysis Frequency-domain analysis Wireless communication
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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