Process of selectively protecting information bits against trans

Details Process of selectively protecting information bits against trans Process of selectively protecting information bits against trans

1996-11-12

1998-12-15

Elmore, Reba I.

Excavating

371 3704, 371 403, 371 204, 371 435, H03M 1300

Patent

active

058504036

ABSTRACT:
Based on the sequence of the information bits to be transmitted, the coder forms a second sequence of bits c.sub.n, which includes a redundant subset. A differential coding of the form d.sub.n =c.sub.n .sym.d.sub.f(n) with f(n)<n produces a third sequence of bits d.sub.n. The signal sent represents the bits of the third sequence in a specified order. Having obtained likelihood data r.sub.n associated with the bits d.sub.n, the receiver calculates estimates of the bits c.sub.n of the redundant subset as a function of the sign of r.sub.n .multidot.r.sub.f(n). By exploiting the redundancy, the receiver can detect the bits c.sub.n of the subset having erroneous estimates, and rectify the sign of the less reliable of the two associated likelihood data items r.sub.n and r.sub.f(n). The other bits c.sub.n ' of the second sequence then benefit from additional protection if there is at least one bit c.sub.n of the redundant subset such that n'=f(n) or f(n')=n or f(n).

REFERENCES:
patent: 5159610 (1992-10-01), Eyuboglu et al.
patent: 5214672 (1993-05-01), Eyuboglu et al.
patent: 5563897 (1996-10-01), Pyndiah et al.
IEE Proceedings-I. Solid-State & Electron Devices, vol. 140, n.degree.2 Part I, Apr. 1993--"Error control for low-bit-rate speech communication systems"--Atungsiri S.A. et al--pp. 97-103.

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