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.
| Original language | English |
|---|---|
| Title of host publication | 14th IST Mobile & Wireless Communications Summit |
| Pages | 5 |
| Number of pages | 5 |
| Publication status | Published - 2005 |
| Event | 14th IST Mobile & Wireless Communications Summit - Duration: 1 Jan 2005 → … |
Conference
| Conference | 14th IST Mobile & Wireless Communications Summit |
|---|---|
| Period | 1/01/05 → … |
Research Field
- Not defined