Name
Title | ||
|---|---|---|
Symbol MAP detection aided with first channel estimate for TDMA systems over a frequency selective channel |
Abstract | ||
|---|---|---|
In this paper, we consider joint iterative equalization and channel estimation for TDMA systems over a frequency selective, quasi-static fading channel. We assume a slowly varying channel impulse response from one burst to the following one. We modify the maximum a posteriori (MAP) criterion by taking into account an a priori channel estimate obtained from the burst preceding the one processed. Assuming that the receiver knows the channel statistics, we propose to use the EM (Expectation-Maximization) algorithm for a joint iterative equalization and channel estimation. During each iteration of the receiver, the EM algorithm reestimates the channel by using the a posteriori probabilities (APP) available at the output of the equalizer. The algorithm we propose has linear-time complexity per iteration. Simulations show that our MAP receiver reaches the performance of the MAP equalizer with perfect channel knowledge after a few iterations, for high SNR and for small values of normalized Doppler spread. They show also that our receiver outperforms the MAP equalizer that uses a channel estimate obtained by using a training sequence. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1109/ISWCS.2009.5285261 | ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems |
Keywords | DocType | ISBN |
posteriori probability,map equalizer,channel estimate,tdma system,varying channel impulse response,symbol map detection,map receiver,frequency selective channel,perfect channel knowledge,joint iterative equalization,em algorithm,quasi-static fading channel,channel estimation,channel statistic,expectation maximization algorithm,fading channel,signal to noise ratio,doppler effect,estimation,linear time,iterative methods,transient response,time division multiple access,maximum a posteriori | Conference | 978-1-4244-3584-5 |
Citations | PageRank | References |
0 | 0.34 | 3 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Inès Kammoun | 1 | 16 | 14.53 |
| Mohamed Siala | 2 | 7 | 2.30 |
| Noura Sellami | 3 | 32 | 11.05 |
| Aline Roumy | 4 | 464 | 32.54 |