Blind CP-OFDM and ZP-OFDM Parameter Estimation in Frequency Selective Channels

Autor: Duplicy Jonathan, Le Nir Vincent, van Waterschoot Toon, Moonen Marc
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Zdroj: EURASIP Journal on Wireless Communications and Networking, Vol 2009, Iss 1, p 315765 (2009)
Druh dokumentu: article
ISSN: 1687-1472
1687-1499
Popis: A cognitive radio system needs accurate knowledge of the radio spectrum it operates in. Blind modulation recognition techniques have been proposed to discriminate between single-carrier and multicarrier modulations and to estimate their parameters. Some powerful techniques use autocorrelation- and cyclic autocorrelation-based features of the transmitted signal applying to OFDM signals using a Cyclic Prefix time guard interval (CP-OFDM). In this paper, we propose a blind parameter estimation technique based on a power autocorrelation feature applying to OFDM signals using a Zero Padding time guard interval (ZP-OFDM) which in particular excludes the use of the autocorrelation- and cyclic autocorrelation-based techniques. The proposed technique leads to an efficient estimation of the symbol duration and zero padding duration in frequency selective channels, and is insensitive to receiver phase and frequency offsets. Simulation results are given for WiMAX and WiMedia signals using realistic Stanford University Interim (SUI) and Ultra-Wideband (UWB) IEEE 802.15.4a channel models, respectively.
Databáze: Directory of Open Access Journals
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