| 摘要 |
<p>A method and apparatus for demodulating data symbols transmitted through a fading communication channel. A plurality of first predetermined data symbols (11), a plurality of unknown data symbols (12), and a plurality of second predetermined data symbols (13) are sequentially received (201). The received pluralities of data symbols are stored (104, 201), and first and second set of reference symbols from the stored pluralities of first and second predetermined data symbols, respectively, are determined (108). A first block consisting of a preselected number of the stored unknown data symbols based on the first set of reference signals are forward-demodulated (154, 203), beginning with unknown symbols received nearer the first predetermined data symbols. A second block consisting of a preselected number of the stored unknown data symbols based on the second set of reference signals are backward-demodulated (155, 203), beginning with the unknown data symbols received nearer the second predetermined data symbols. Figure of Merit (FOM) values (56, 57) indicative of demodulation qualities of the forward- and backward-demodulated data symbols are determined for the two blocks and compared (153, 204) with one another. Either the forward- or backward-demodulated data symbols are selected for output as the demodulated data based on the comparison of FOM values and two new blocks are chosen and the process repeated until all the symbols are demodulated. The FOM is based upon parameters which may include signal strength information.</p> |
