Adaptive T-Detector exploiting Outer SISO Decoder in Time-Selective Channels

We present a trainable and adaptive detector (the T-Detector) with a core trainable BCJR (T-BCJR) that leverages the extrinsic information provided by an outer SISO decoder to enhance its tracking capability in time-varying channels. The T-Detector is designed to be channel- and modulation-agnostic, performing key detection tasks such as channel shortening, Maximum Likelihood (ML) sequence detection, and Log-Likelihood (LL) computation for soft-input channel decoding. Its processing complexity remains equal to that of conventional detection methods. The exploitation of the outer decoder enhances system performance and reduces pilot overhead.