Name
Abstract | ||
|---|---|---|
Expectation-maximization (EM) based iterative algorithms are investigated in order to estimate the impulse response of a frequency-selective multipath channel in a coded OFDM system. Two ways of choosing the EM complete data are compared: a complete data built from observations and transmitted symbols (CL-EM) and a complete data chosen by decomposing noise and observation components (NCD-EM). Both CL-EM and NCD-EM algorithms are derived for a coded OFDM system. The rate of convergence of both EM algorithms is theoretically determined. It is found that the rate of convergence of CL-EM is independent from the number of channel taps at high signal-to-noise ratio (SNR), while that of NCD-EM varies with the number of taps. It is shown that CL-EM converges in a few iterations. Furthermore, considering the complexity per iteration, CL-EM has a lower complexity than its counterpart. We also establish a Cramer-Rao bound (CRB) for coded OFDM transmission. Simulation results show that CL-EM has a good performance-complexity trade-off and it achieves the CRB. |
Year | DOI | Venue |
|---|---|---|
2011 | 10.1109/TWC.2011.080311.100249 | IEEE Transactions on Wireless Communications |
Keywords | Field | DocType |
modulation coding,expectation-maximisation algorithm,cramer-rao bound,cl-em algorithms,data communication,coded multicarrier transmissions,ncd-em algorithms,ofdm modulation,channel coding,expectation maximization,multipath channels,orthogonal frequency-division multiplexing,convergence,expectation maximization algorithm,convergence of numerical methods,transient response,iterative algorithms,impulse response,coded ofdm system,rate of convergence,iterative methods,channel estimation,frequency selective multipath channel,signal-to-noise ratio,estimation,ofdm,orthogonal frequency division multiplexing,signal to noise ratio,cramer rao bound | Cramér–Rao bound,Impulse response,Iterative method,Expectation–maximization algorithm,Signal-to-noise ratio,Algorithm,Communication channel,Real-time computing,Rate of convergence,Statistics,Orthogonal frequency-division multiplexing,Mathematics | Journal |
Volume | Issue | ISSN |
10 | 10 | 1536-1276 |
Citations | PageRank | References |
3 | 0.49 | 12 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yang Liu | 1 | 12 | 2.10 |
| Loïc Brunel | 2 | 147 | 14.09 |
| Joseph Jean Boutros | 3 | 228 | 24.65 |