| 摘要 |
<p>An apparatus and method for the detection of a coded digital signal received through a communication channel, in particular for the reception of serial-tone waveforms for High Frequency communication, involving a Soft In Soft Out (SISO) equalizer (300) and a SISO decoder (302) forming an iterative Turbo equalizer loop, a channel estimator (309) supplying channel impulse response estimates to the SISO equalizer (300), a source of known symbols (tn), first switching means (S2) adapted to supply either intrinsic and extrinsic soft symbols from the SISO decoder (302) to the channel estimator (309) when receiving symbols carrying information, or supply known symbols (tn) to the channel estimator (309) and the SISO equalizer (300) when receiving training sequences, and a hard decision mapper (308) receiving soft symbols from the SISO equalizer (300) and second switching means (S2) adapted to supply hard decision symbols to the channel estimator (309) from said mapper (308).</p> |
