Communication systems using nested coder and compatible channel

Details Communication systems using nested coder and compatible channel Communication systems using nested coder and compatible channel

1996-10-21

2000-11-28

Pham, Chi H.

Pulse or digital communications

Systems using alternating or pulsating current

704200, 375316, H04L 2700

Patent

active

06154499&

ABSTRACT:
A communication network, comprising data transmission and data receiving systems and operations, for carrying reliable voice communications, particularly for mobile communications applications involving land-mobile, aeronautical and maritime systems. Because the quality of the links in such systems may vary, the present invention combines a nested codec with a channel coder at the transmission side of the link and a decoder at the reception side. The nested codec will transmit at a constant rate, which is the highest bit rate possible in the system, but according to channel conditions, will reconstruct voice at different bit rates. Thus, for example, transmission will always occur at a rate of 3600, but the reconstruction of the transmitted signal will be at 2400 or 1200 bps, depending on the quality of the signal. Notably, the lower two rates are subsets of the higher rate, thus defining their "nested" characteristic. Moreover, the rate reductions from the constant maximum rate occur automatically at the receiver, without transmitter control, based on the detected degraded conditions at the receiver. Because the rates are nested, they are a known multiple of the lowest rate.

REFERENCES:
patent: 3975587 (1976-08-01), Dunn et al.
patent: 4890328 (1989-12-01), Prezas et al.
patent: 4912764 (1990-03-01), Hartwell et al.
patent: 4945549 (1990-07-01), Simon et al.
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5214656 (1993-05-01), Chung et al.
patent: 5243629 (1993-09-01), Wei
patent: 5289501 (1994-02-01), Seshadri et al.
patent: 5313490 (1994-05-01), Schramm et al.
patent: 5371737 (1994-12-01), Nelson et al.
patent: 5404394 (1995-04-01), Dimolitsas et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5442625 (1995-08-01), Gitlin et al.
patent: 5448593 (1995-09-01), Hill
patent: 5467132 (1995-11-01), Fazel et al.
patent: 5504776 (1996-04-01), Yamaura et al.
patent: 5546420 (1996-08-01), Seshadri et al.
patent: 5557639 (1996-09-01), Heikkila et al.
patent: 5581580 (1996-12-01), Lindbom et al.
patent: 5666370 (1997-09-01), Ganesan et al.
patent: 5691992 (1997-11-01), Molnar et al.
patent: 5701294 (1997-12-01), Ward et al.
Hagenauer et al., variable rate sub-band speech coding and matched channel coding for mobile radio channels, IEEE, pp. 139-146, Sep. 1988.
Hagenauer et al., a sub-band coder designed for combined source and channel coding, IEEE, pp. 235-237, Sep. 1988.

Affiliated with

Also associated with

Rating

Communication systems using nested coder and compatible channel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communication systems using nested coder and compatible channel , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication systems using nested coder and compatible channel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1733091