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http://dx.doi.org/10.7840/kics.2013.38B.4.305

An Efficient Transceiver Technique for Wideband VHF Baseband Modem  

Lee, Hwang-Hee (School of Electric & Electronic Engineering, Chung-Ang University)
Kim, Jae-Hwan (School of Electric & Electronic Engineering, Chung-Ang University)
Yang, Won-Young (School of Electric & Electronic Engineering, Chung-Ang University)
Cho, Yong-Soo (School of Electric & Electronic Engineering, Chung-Ang University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.38B, no.4, 2013 , pp. 305-313 More about this Journal
Abstract
As an FMT (Filtered Multi-Tone) transmission method of Wideband VHF communication system specified by the ETS (European Telecommunications Standards) EN 300 392-2, this paper introduces three existing realization methods, i.e., the direct filtering method using different band SRRC (Square-Root Raised Cosine) filters for each subcarrier, the PPN-DFT method using the IDFT-PPN (Poly-Phase Network) and PPN-DFT at the transmitter and receiver, respectively, and the Extended DFT method. Then, it proposes the extended IDFT-SDFT (Sliding Discrete Fourier Transform) that computes the DFT values only for interested subcarriers every sample time, and shows that it has an advantage of blind symbol timing (using no training symbol) individually for each user signal (independently of other users' signals) in the multi-user environment where the subcarriers are assigned in contiguous or interleaved blocks to each user and each user signal possibly experiences different channels.
Keywords
FMT (Filtered MultiTone); PPN (Poly-Phase Network); Extended DFT; SDFT (Sliding Discrete Fourier Transform);
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