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Performance of a nonlinear adaptive SBS-MAP detector using soft-statistics for digital transmissions over HF channels

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3 Author(s)
E. Baccarelli ; INFOCOM Dept., Rome Univ., Italy ; R. Cusani ; S. Galli

The effectiveness of the adaptive maximum a posteriori (MAP) receiver in Cusani and Mattila is verified for digital HF links between mobile and/or fixed units. Following Cusani and Mattila (1998), a suitable MAP algorithm is employed to compute symbol-by-symbol (SBS) the a posteriori probabilities (APPs) of the channel state; from these, the detected data stream is obtained. The same APPs are employed by an adaptive nonlinear Kalman-like filter to estimate recursively the time-varying channel with fast convergence and good tracking properties, overcoming the delay problem suffered by conventional adaptive MLSE-VA detectors. Computer simulations allow to compare the adaptive SBS-MAP with other receivers (DFE, MLSE) and verify its effectiveness in the HF environment

Published in:

IEEE Transactions on Vehicular Technology  (Volume:49 ,  Issue: 4 )