Methods of and devices for enhancing communications that use spr

Details Methods of and devices for enhancing communications that use spr Methods of and devices for enhancing communications that use spr

1998-08-06

2000-03-28

Olms, Douglas W.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370465, 370347, 714746, 375206, H04N 7216

Patent

active

060440732

ABSTRACT:
We have invented methods of and devices for introducing unequal error protection into spread spectrum communication systems. One embodiment of the invention addresses certain inefficiencies of the standard known as IS-95 used, for example, in some mobile direct sequence code division multiple access ("DS-CDMA") phone systems. The invention allows for increased system capacity and/or improved quality. More specifically, spread spectrum multiple access ("SSMA") coding may be combined with the concept of unequal error protection ("UEP"), resulting in an UEP SSMA coding process. IS-95, in order to make significant portions of a signal highly immune to errors, has imposed the same high degree of error immunity on less significant portions of the signal (when, in fact, a lower degree would suffice) and, thus, wastes bandwidth. The present invention's coding process (i.e., UEP SSMA) utilizes bandwidth in a closer to optimal manner than known methods.

REFERENCES:
patent: 4217467 (1980-08-01), Kobayashi et al.
patent: 5003619 (1991-03-01), Morris
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5031192 (1991-07-01), Clark
patent: 5105442 (1992-04-01), Wei
patent: 5140417 (1992-08-01), Tanaka et al.
patent: 5197061 (1993-03-01), Halbert-Lassalle et al.
patent: 5204876 (1993-04-01), Brukert et al.
patent: 5214656 (1993-05-01), Chung et al.
patent: 5235614 (1993-08-01), Brucka et al.
patent: 5257029 (1993-10-01), Miyo
patent: 5259003 (1993-11-01), Berger et al.
patent: 5274667 (1993-12-01), Olmstead
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5280537 (1994-01-01), Sugiyama et al.
patent: 5282019 (1994-01-01), Basile et al.
patent: 5285470 (1994-02-01), Schreiber
patent: 5287374 (1994-02-01), Parr
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5305352 (1994-04-01), Calderbank et al.
patent: 5311543 (1994-05-01), Schreiber
patent: 5329547 (1994-07-01), Ling
patent: 5341396 (1994-08-01), Higgins et al.
patent: 5341401 (1994-08-01), Farjh et al.
patent: 5345596 (1994-09-01), Buchenhorner et al.
patent: 5377194 (1994-12-01), Calderbank
patent: 5383219 (1995-01-01), Wheatley, III et al.
patent: 5390165 (1995-02-01), Tuch
patent: 5396516 (1995-03-01), Padovani et al.
patent: 5412686 (1995-05-01), Ling
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5416801 (1995-05-01), Chouly et al.
patent: 5452288 (1995-09-01), Rahuel et al.
patent: 5502744 (1996-03-01), Marshall
patent: 5533004 (1996-07-01), Jasper et al.
patent: 5691992 (1997-11-01), Molnar et al.
patent: 5691995 (1997-11-01), Ikeda et al.
patent: 5751739 (1998-05-01), Seshadri et al.
patent: 5825807 (1998-10-01), Derck
A. Baier et al., "Multi-rate DS-CDMA Radio Interface for Third Generation Cellular Systems," Seventh IEEE European Conference on Mobile and Personal Communications, Dec. 13-15, 1993, pp. 255-260.
A. Baier et al., "Potential of CDMA for 3.sup.rd Generation Mobile Radio Systems," Proceedings MRC--Mobile Radio Cenference, Nov. 13-15, 1991, pp. 1-8.
L. Cellario et al., "A VR-CELP Coec Implementation for CDMA Mobile Communications," IEEE International Conference on Acoustics, Speech and Signal Processing, Apr. 19-22, 1994, pp. 281-284.
P. Hoehr, "Unequal Error Protection for Digital Mobile DC-CDMA Radio Systems," IEEE International Conference on Communications SUPERCOMM/ICC '94, May 1-5, 1994, pp. 1236-1241.
A. Baier, "Design Study for a CDMA-Based Third-Generation Mobile Radio System," IEEE Journal on Selected Areas in Communications, vol. 12, No. 4, May 1994, pp. 733-743.
K. S. Gilhousen et al., "On The Capacity Of A Cellular CDMA System," IEEE Transactions of Vehicular Technology, vol. 40, No. 2, May 1991, pp. 303-312.
J. Hagenauer et al., "The Performance Of Rate Compatible Punctured Convolutional Codes For Digital Mobile Radio," IEEE Transactions on Communications 38(7), Jul. 1990, pp. 966-980.
C-E. Sundberg et al., "Digital Cellular Systems For North America," IEEE Global Telecommunications Conference & Exhibition, San Diego, CA, Dec. 1990.
U.S. application No. 08/179,831, by W. B. Klein.

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