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Robust Frequency Hopping for Interference and Fading Channels

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3 Author(s)
Torrieri, D. ; US Army Res. Lab., Adelphi, MD ; Shi Cheng ; Valenti, M.C.

A robust frequency-hopping system with noncoherent detection, iterative turbo decoding and demodulation, and channel estimation is presented. The data modulation is the spectrally compact nonorthogonal continuous-phase frequency-shift keying, which strengthens the frequency-hopping system against multiple-access interference and multitone jamming. An analysis based on information theory provides the optimal values of the modulation index when there is a bandwidth constraint. The channel estimator, which is derived by applying the expectation- maximization algorithm, accommodates both frequency-selective fading and interference. Simulation experiments demonstrate the excellent system performance against both partial-band and multiple-access interference.

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Communications, IEEE Transactions on  (Volume:56 ,  Issue: 8 )