Channel estimation by exploiting sublayer information in OFDM systems

Autor:	Maik Bevermeier, Reinhold Haeb-Umbach, Tobias Ebel
Rok vydání:	2007
Předmět:	symbols.namesake Computational complexity theory Computer science Robustness (computer science) Orthogonal frequency-division multiplexing Wiener filter Bit error rate symbols Physical layer Preamble Ofdm transmission Algorithm Computer Science::Information Theory
Zdroj:	Lecture Notes Electrical Engineering ISBN: 9781402061288 MCSS
DOI:	10.1007/978-1-4020-6129-5_39
Popis:	In this paper we investigate the possibilities to generate a postamble in block-oriented OFDM transmission without compromising the effective user data rate. The idea is to complete known bits at the end of each physical layer frame to a full OFDM symbol to be used for channel estimation. A Wiener Filter is then employed to interpolate between the channel estimates obtained on the pre- and postamble. We present experimental results for an IEEE 802.11a-like system. A comparison with purely preamble-based channel estimation shows a reduced mean square channel estimation error and bit error rate at low computational complexity and only minor reduction of the net user data rate. Results of robustness tests are also discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::85cc8143f19ced0e28b544f29da4ea1e https://doi.org/10.1007/978-1-4020-6129-5_39 Zobrazit plný text záznamu