Name
Title | ||
|---|---|---|
Parameter estimation and equalization techniques for communication channels with multipath and multiple frequency offsets |
Abstract | ||
|---|---|---|
We consider estimation of frequency offset (FO) and equalization of a wireless communication channel, within a general framework which allows for different frequency offsets for various multipaths. Such a scenario may arise due to different Doppler shifts associated with various multipaths, or in situations where multiple basestations are used to transmit identical information. For this general framework, we propose an approximative maximum-likelihood estimator exploiting the correlation property of the transmitted pilot signal. We further show that the conventional minimum mean-square error equalizer is computationally cumbersome, as the effective channel-convolution matrix changes deterministically between symbols, due to the multiple FOs. Exploiting the structural property of these variations, we propose a computationally efficient recursive algorithm for the equalizer design. Simulation results show that the proposed estimator is statistically efficient, as the mean-square estimation error attains the Crame´r-Rao lower bound. Further, we show via extensive simulations that our proposed scheme significantly outperforms equalizers not employing FO estimation. |
Year | DOI | Venue |
|---|---|---|
2005 | 10.1109/TCOMM.2004.841970 | IEEE Transactions on Communications |
Keywords | Field | DocType |
doppler shift,channel estimation,computational complexity,equalisers,frequency estimation,matrix algebra,maximum likelihood estimation,mean square error methods,multipath channels,radio networks,channel-convolution matrix,communication channel,equalization technique,frequency offset estimation,maximum-likelihood estimator,minimum mean-square error equalizer,multipath channel,parameter estimation,recursive algorithm,frequency offset (fo) estimation,minimum mean-square error (mmse) equalizer and complexity,wireless multipath channels,maximum likelihood estimate,minimum mean square error,communication channels,frequency offset,lower bound,wireless communication | Multipath propagation,Equalization (audio),Computer science,Frequency offset,Communication channel,Mean squared error,Electronic engineering,Estimation theory,Pilot signal,Estimator | Journal |
Volume | Issue | ISSN |
53 | 2 | 0090-6778 |
Citations | PageRank | References |
10 | 0.93 | 3 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Sajid Ahmed | 1 | 186 | 18.45 |
| Sangarapillai Lambotharan | 2 | 687 | 69.79 |
| Andreas Jakobsson | 3 | 409 | 43.32 |
| Jonathon A. Chambers | 4 | 54 | 14.77 |