Multiuser detection aided multiple access differential...

Details Multiuser detection aided multiple access differential... Multiuser detection aided multiple access differential...

2006-02-14

2006-02-14

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Spread spectrum

Frequency hopping

C375S136000, C375S349000, C455S303000

Reexamination Certificate

active

06999498

ABSTRACT:
Techniques for multiple access differential frequency-hopped spread spectrum (MA-DFHSS) aided by multiuser detection (MUD) are disclosed. An initial DFH decoding is performed to provide data estimates for each user represented in a received co-channel signal. Interference cancellation is then performed using MUD, thereby providing an interference-cancelled signal. Data estimates remaining are then re-decoded. Iteration on the interference cancellation and re-decoding can be carried out to satisfy a particular rule of iteration, although iteration is not always necessary. The final decoded signal can then be provided to its destination.

REFERENCES:
patent: 5048057 (1991-09-01), Saleh et al.
patent: 5193102 (1993-03-01), Meidan et al.
patent: 5483550 (1996-01-01), Hulbert
patent: 5745187 (1998-04-01), Hulyalkar et al.
patent: 6201563 (2001-03-01), Rhee
patent: 6278723 (2001-08-01), Meihofer et al.
patent: 6345073 (2002-02-01), Curry et al.
patent: 6704376 (2004-03-01), Mills et al.
Lee, P.K. et al, “Capacity Enhancement for Correlated Frequency Hopping Systems”, ATIRP,1997, pp1-6.
Lee, P.K. et al, “Spectrum Efficient HF System for Mobile Long Haul Communications”, ATIRP,1999, pp1-5.
Robertson, Patrick et al, “A Comparison of Optimal and Sub-Optimal MAP Decoding Algorithms Operating in the Log Doman”, IEEE, 1995, pp1009-1013.
Hagenauer, Joachim et al, “A Viterbi Algorithm with Soft-Decision Outputs and its Applications”, IEEE, 1989, pp1680-1686.
Pottie, Gregory et al, “A Comparison of Reduced Complexity Decoding Algorithms for Trellis Codes”, IEEE, Dec. 1989, pp1369-1380, vol. 7, No. 9.
Aulin, Tor et al, “Trellis Coded Multiple Access (TCMA)”, IEEE, 1999, pp1177-1181.
PCT Search Report dated Dec. 12, 2003 of Patent Application No. PCT/US03/24920 filed Aug. 7, 2003.
PCT Search Report dated Sep. 1, 2004 of Patent Application No. PCT/US04/12414 filed Apr. 22, 2004.
PCT Search Report dated Jan. 12, 2005 of Patent Application No. PCT/US04/12483 filed Apr. 21, 2004.

Affiliated with

Also associated with

Rating

Multiuser detection aided multiple access differential... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiuser detection aided multiple access differential..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiuser detection aided multiple access differential... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3655207