Communications system handoff operation combining turbo coding a

Details Communications system handoff operation combining turbo coding a Communications system handoff operation combining turbo coding a

1999-08-20

2000-07-25

Marcelo, Melvin

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

455436, 455442, H04Q 738

Patent

active

060944277

ABSTRACT:
Communication systems, including, for example, cell-based mobile communication systems, multiple satellite communication systems, or multibeam satellite systems, require reliable handoff methods between cell-to-cell, beam-to-beam, or satellite-to-satellite respectively. Recent measurement of a CDMA cellular system indicates that the system is in handoff about 30% to 50% of an average call period. Therefore, system reliability during handoff is one of the major system performance parameters and eventually becomes a factor in the overall system capacity. The present invention advantageously relates to novel and improved techniques for handoff in cellular communications, multibeam and multisatellite systems. The present invention combines the soft handoff mechanism with a code diversity combining technique (i.e., combining signals from multiple sources), a packet combining technique (i.e., combining multiple signals), and an iterative decoding algorithm (e.g., Turbo Coding).

REFERENCES:
patent: 4029900 (1977-06-01), Addeo
patent: 4455602 (1984-06-01), Baxter, III et al.
patent: 4493027 (1985-01-01), Katz et al.
patent: 4525780 (1985-06-01), Bratt et al.
patent: 4876740 (1989-10-01), Levine et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5184347 (1993-02-01), Farwell et al.
patent: 5195090 (1993-03-01), Bolliger et al.
patent: 5195091 (1993-03-01), Farwell et al.
patent: 5257397 (1993-10-01), Barzegar et al.
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5278892 (1994-01-01), Bolliger et al.
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5295153 (1994-03-01), Gudmundson
patent: 5299198 (1994-03-01), Kay et al.
patent: 5305308 (1994-04-01), English et al.
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5341397 (1994-08-01), Gudmundson
patent: 5357513 (1994-10-01), Kay et al.
patent: 5381443 (1995-01-01), Borth et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5432822 (1995-07-01), Kaewell, Jr.
patent: 5442627 (1995-08-01), Viterbi et al.
patent: 5446747 (1995-08-01), Berrou
patent: 5475870 (1995-12-01), Weaver, Jr. et al.
patent: 5485486 (1996-01-01), Gilhousen et al.
patent: 5513176 (1996-04-01), Dean et al.
patent: 5513183 (1996-04-01), Kay et al.
patent: 5533011 (1996-07-01), Dean et al.
patent: 5533027 (1996-07-01), kerberg et al.
patent: 5539730 (1996-07-01), Dent
patent: 5566168 (1996-10-01), Dent
patent: 5577047 (1996-11-01), Persson et al.
patent: 5581575 (1996-12-01), Zehavi et al.
patent: 5584049 (1996-12-01), Weaver, Jr. et al.
patent: 5602833 (1997-02-01), Zehavi
patent: 5602834 (1997-02-01), Dean et al.
patent: 5604744 (1997-02-01), Andersson et al.
patent: 5608722 (1997-03-01), Miller
patent: 5621723 (1997-04-01), Walton, Jr. et al.
patent: 5623484 (1997-04-01), Muszynski
patent: 5633868 (1997-05-01), Baldwin et al.
patent: 5640414 (1997-06-01), Blakeney, II et al.
patent: 5654979 (1997-08-01), Levin et al.
patent: 5668837 (1997-09-01), Dent
patent: 5673259 (1997-09-01), Quick, Jr.
patent: 5675629 (1997-10-01), Raffel et al.
patent: 5691974 (1997-11-01), Zehavi et al.
patent: 5694414 (1997-12-01), Smith et al.
patent: 5703902 (1997-12-01), Ziv et al.
patent: 5710758 (1998-01-01), Soliman et al.
patent: 5710768 (1998-01-01), Ziv et al.
patent: 5715236 (1998-02-01), Gilhousen et al.
patent: 5715516 (1998-02-01), Howard et al.
patent: 5717689 (1998-02-01), Ayanoglu
patent: 5722074 (1998-02-01), Muszynski
patent: 5724610 (1998-03-01), Han et al.
patent: 5907582 (1999-05-01), Yi
patent: 5978365 (1999-11-01), Yi
Peter R. Denz et al., "Performance of Error Control Techniques for Wireless ATM", IEEE, pp. 1099-1103, Sep. 1998.
Naftali Chayat, "Turbo Codes for Incoherent M-ary Orthogonal Signaling", IEEE, pp. 471-474, Jun. 1996.
Frank Burkert et al., "Turbo Decoding with Unequal Error Protection applied to GSM speech coding", IEEE, pp. 2044-2048, May 1996.

Affiliated with

Also associated with

Rating

Communications system handoff operation combining turbo coding a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communications system handoff operation combining turbo coding a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communications system handoff operation combining turbo coding a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1341622