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

1994-04-29

1998-05-12

Baker, Stephen M.

Excavating

H03M 1300

Patent

active

057517398

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: 5197061 (1993-03-01), Halbert-Lassalle et al.
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5259003 (1993-11-01), Berger et al.
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5287374 (1994-02-01), Parr
patent: 5295152 (1994-03-01), Gudmundson et al.
patent: 5329547 (1994-07-01), Ling
patent: 5341401 (1994-08-01), Farjh et al.
patent: 5383219 (1995-01-01), Wheatley, III et al.
patent: 5396516 (1995-03-01), Padovani et al.
patent: 5416801 (1995-05-01), Chouly et al.
U.S. Patent Application Ser. No. 08/179831, filed Jan. 5, 1994, "Method and Apparatus For Prototype Waveform Speech Coding", filed by W. B. Kleijn.
K.S. Gilhousen et al., "On The Capacity Of A 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," 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.
A. Baier et al., Multi-Rate DS-CDMA Radio Interface for Third-Generation Cellular Systems, Seventh IEE European Conference on Mobile and Personal Communications, pp. 255-260, Dec. 13-15, 1993.
A. Baier et al., Potential of CDMA for 3rd Generation Mobile Radio Systems, MRC-Mobile Radio Conference, pp. 1-8, Nov. 13-15 1991.
Luca Cellario et al., A VR-CELP Codec Implementation for CDMA Mobile Communications, 1994 IEEE International Conference on Acoustics, Speech and Signal Processing, vol. 1, pp. 281-284.
Alfred Baier et al., Design Study for a CDMA-BAsed Third-Generation Mobile Radio System, IEEE Journal on Selected Areas in Communications, vol. 12, No. 4, pp. 733-743, May 1994.
Peter Hoeher, Unequal Error Protection for Digital Mobile DS-CDMA Radio Systems, Institute of Electrical and Electronics Engineers, vol. 3, pp. 1236-1241, May 1-5, 1994.

Affiliated with

Also associated with

Rating

Methods of and devices for enhancing communications that use spr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods of and devices for enhancing communications that use spr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of and devices for enhancing communications that use spr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-990551