Name
Abstract | ||
|---|---|---|
Receivers for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems usually perform the channel estimation based on pilot carriers in known positions of the channel spectrum. Interpolation between pilot carriers is applied to determine the channel transfer function in all carrier frequencies. Channel variations along time are compensated by means of interpolation between successive channel estimates on the same carrier frequency. However, not rarely, the fast channel variations exceed the time interpolator capability, as is the case for mobile operation. In this article we present a new channel compensation technique based on the concurrent operation of two stochastic gradient time- domain algorithms, one which minimizes a cost function that measures the received signal energy dispersion and other which minimizes the Euclidean distance between the received digital modulation symbols and the ones in the reference constellation assigned to each OFDM sub-channel. Results show that the new technique advantageously improves the system robustness to fast channel variations since, with a low computational cost, it |
Year | DOI | Venue |
|---|---|---|
2007 | 10.1590/S0104-65002007000100002 | J. Braz. Comp. Soc. |
Keywords | Field | DocType |
cost function,frequency domain,time domain,transfer function,channel equalization,spectrum,euclidean distance | Frequency domain,Multipath propagation,Demodulation,Data mining,Telecommunications,Equalization (audio),Computer science,Interpolation,Communication channel,Electronic engineering,Modulation,Orthogonal frequency-division multiplexing | Journal |
Volume | Issue | ISSN |
13 | 1 | 1678-4804 |
Citations | PageRank | References |
3 | 0.59 | 3 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Fábio D'Agostini | 1 | 3 | 0.93 |
| Sirlesio Carboni Júnior | 2 | 3 | 0.59 |
| Maria Cristina Felippetto de Castro | 3 | 11 | 2.90 |
| Fernando Comparsi de Castro | 4 | 18 | 4.71 |