1
Nambirajan Seshadri, Carl Erik W Sundberg: Coded modulation with unequal error protection for fading channels. AT&T Bell Laboratories, Gerard A deBlasi, February 22, 1994: US05289501 (54 worldwide citation)

Information is transmitted in digital form over fading channels using DPSK coded modulation incorporating multi-level coding in order to provide unequal error protection for different classes of data such as generated by CELP or other speech encoders.


2
Seshadri Nambirajan, Sundberg Carl Erik Wilhelm: Coded modulation, with unequal error protection, for fading channels.. American Telephone & Telegraph, June 2, 1993: EP0544463-A2 (10 worldwide citation)

Information is transmitted in digital form over fading channels using DPSK coded modulation incorporating multi-level coding (120) in order to provide unequal error protection for different classes of data (on K1, K2, K3) such as generated by CELP or other speech encoders (104).


3
Seshadri Nambirajan, Sundberg Carl Erik Wilhelm: Modulation codee a protection non uniforme contre les erreurs pour les canaux sujets aux evanouissements, Coded modulation with unequal error protection for fading channels. American Telephone And Telegraph Company, KIRBY EADES GALE BAKER, November 26, 1996: CA2079287

Information is transmitted in digital form over fading channels using DPSK coded modulation incorporating multi-level coding in order to provide unequal error protection for different classes of data such as generated by CELP or other speech encoders.