Abstract
Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband system operating with high mobility is very challenging. This is mainly due to the significant Doppler spread, inherent in a time-frequency doubly-selective (DS) channel. Consequently, a large number of channel coefficients must be estimated, forcing the need for allocating a large number of pilot subcarriers. To address this problem, we propose a novel channel estimation method based on basis expansion models (BEMs) and distributed compressive sensing (DCS) theory. To be specific, we develop a two-stage sparse BEM coefficients estimation method, which can effectively combat the Doppler spread and enable accurate channel estimation with dramatically reduced number of pilot subcarriers. The numerical results reveal that, in a typical LTE system configuration, the proposed scheme can increase the spectral efficiency by 40% and achieve a 6 dB gain in terms of normalized mean square error (NMSE), both compared to the conventional scheme.
Original language | English |
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Title of host publication | ICC 2013 |
Subtitle of host publication | IEEE International Conference on Communications : proceedings |
Editors | Dong-In Kim, Peter Mueller |
Place of Publication | Piscataway, NJ |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Pages | 4951-4956 |
Number of pages | 6 |
ISBN (Electronic) | 9781467331227 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Event | IEEE International Conference on Communications - Budapest, Hungary Duration: 9 Jun 2013 → 13 Jun 2013 |
Other
Other | IEEE International Conference on Communications |
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Country/Territory | Hungary |
City | Budapest |
Period | 9/06/13 → 13/06/13 |