DMCA
Successive Slepian Subspace Projection in Time and Frequency for Time-Variant Channel Estimation (2005)
| Venue: | IN PROCEEDINGS OF THE 14TH IST MOBILE AND WIRELESS COMMUNICATION SUMMIT (IST |
| Citations: | 12 - 5 self |
BibTeX
@INPROCEEDINGS{Zemen05successiveslepian,
author = {Thomas Zemen and Helmut Hofstetter and Gerhard Steinböck},
title = {Successive Slepian Subspace Projection in Time and Frequency for Time-Variant Channel Estimation},
booktitle = {IN PROCEEDINGS OF THE 14TH IST MOBILE AND WIRELESS COMMUNICATION SUMMIT (IST},
year = {2005},
publisher = {}
}
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Abstract
This paper describes an iterative time-variant channel estimator for the uplink of a multi-carrier code division multiple access (MC-CDMA) system. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM). Due to OFDM every time-variant frequency-flat subcarrier can be estimated individually. We develop a successive Slepian subspace projection in the time and frequency domain. The subspace in the time domain is spanned by discrete prolate spheroidal (DPS) sequences. The DPS sequences are designed according to two system parameters, the maximum Doppler bandwidth and the block length. The correlation between the individual subcarriers can be exploited by a subspace projection in the frequency domain, using so called shifted DPS sequences. The shifted DPS sequences are designed according to the maximum essential support of the channel impulse response and the number of subcarriers. Due to the subspace projection in the frequency domain the presented channel estimator is able to deal with realistic channels that have non sample-spaced path delays. We validate the channel estimator with a geometry based stochastic channel model according to the COST 259 recommendations.
Keyphrases
successive slepian subspace projection time-variant channel estimation subspace projection frequency domain dp sequence realistic channel presented channel estimator channel impulse response individual subcarriers channel estimator maximum doppler bandwidth time-variant frequency-flat subcarrier multi-carrier code division multiple access shifted dp sequence stochastic channel model maximum essential support time domain block length sample-spaced path delay system parameter iterative time-variant channel estimator orthogonal frequency division multiplexing discrete prolate spheroidal
