Robust Detection of Binary CPMs With Unknown Modulation Index

Malek Messai (1, 2) , Colavolpe Giulio (3) , Karine Amis Cavalec (1, 2) , Frédéric Guilloud (1, 2)

1 Lab-STICC_TB_CACS_COM
2 SC - Département Signal et Communications
3 UNIPR - Università degli studi di Parma = University of Parma

We consider soft-output detection of a binary continuous phase modulation (CPM) generated through a low-cost transmitter, thus characterized by a significant modulation index uncertainty, and sent over a channel affected by phase noise. The proposed detector is designed by adopting a simplified representation of a binary CPM signal with the principal component of its Laurent decomposition and is obtained by using the framework based on factor graphs and the sum-product algorithm. It does not require an explicit estimation of the modulation index nor of the channel phase and is very robust to large uncertainties of the nominal value of the modulation index. Being soft-output in nature, this detector can be employed for iterative detection/decoding of practical coded schemes based on a serial concatenation, possibly through a pseudo-random interleaver, of an outer encoder and a CPM modulation format

Domaines: Traitement du signal et de l'image [eess.SP]

Malek Messai, Colavolpe Giulio, Karine Amis Cavalec, Frédéric Guilloud. Robust Detection of Binary CPMs With Unknown Modulation Index. IEEE Communications Letters, 2015, 19 (3), pp.339 - 342. ⟨10.1109/LCOMM.2015.2390230⟩. ⟨hal-01201662⟩