Planar approximating method for computing the log-likelihood rat

Details Planar approximating method for computing the log-likelihood rat Planar approximating method for computing the log-likelihood rat

1995-05-15

1997-08-12

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375280, H04L 2722

Patent

active

056573545

ABSTRACT:
The optimum decoding of component codes in Block Coded Modulation (BCM) schemes requires the use of the Log-Likelihood Ratio (LLR) as the signal metric. The essence of the invention is a means of accurately approximating the computation of the LLR in a way which is simple to implement directly. The invention, the Log-Likelihood Ratio Planar Approximation (LLRPA), mathematically consists solely of planar equations with fixed point arithmetic that provides both an accurate estimate of the LLR and is easily realized in electronic hardware.

REFERENCES:
patent: 3764743 (1973-10-01), Melvin
patent: 3808376 (1974-04-01), Melvin
patent: 4087752 (1978-05-01), Melvin
patent: 4597090 (1986-06-01), Forney, Jr.
patent: 4882733 (1989-11-01), Tanner
patent: 5329551 (1994-07-01), Wei
H. Imai, S. Hirakawa, "A new multilevel coding method using error-correcting codes," IEEE Trans. Inform. Theory, vol. IT.sub.-- 23, No. 3, pp. 371-376, May 1977.
M. Vanderaar, P. Wagner, and J. Budinger, "Least reliable bits coding (LRBC) for high data rate satellite communications," Proc. AIAA 14th International Communications Satellite System Conference, Washington D.C., Mar. 1992, pp. 507-514.
S. Lin, D. Costello, Jr., Error Control Coding: Fundamantals and Applications. Englewood Cliffs, NJ: Prentice-Hall, 1983.
H. Woetrz, J. Hagenauer, "Multistage coding and decoding for a M-PSK system," Proc. IEEE Global Telecommun. Conf., San Diego, CA., Dec. 1990, pp. 698-703.

Affiliated with

Also associated with

Rating

Planar approximating method for computing the log-likelihood rat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Planar approximating method for computing the log-likelihood rat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planar approximating method for computing the log-likelihood rat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-166638