Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2005-10-18
2005-10-18
Chase, Shelly (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
Reexamination Certificate
active
06957381
ABSTRACT:
The present inventive system and method relate to the computation of branch metrics in Trellis Coded Modulation communication systems, specifically one that uses a Viterbi decoder. As described herein, the branch metrics are located in a look-up table which is indexed by at least one polar coordinate. The use of the look-up table relieves the computational burden of calculating branch metrics from the receiver processor thereby allowing the receiver to decode highly complex waveforms without an increase in processor computational capacity and attendant increase in power consumption. Angular offset values or polar coordinates that are otherwise calculated by the receiver processor are used to enter the look-up table and extract the appropriate branch metric for use by the Viterbi decoder. The inventive system and method can be used with any modulated digital signal and specifically can be used with a MIL-STD-188-181b signal.
REFERENCES:
patent: 6370201 (2002-04-01), Abbaszadeh et al.
patent: 6424685 (2002-07-01), Messel et al.
Viterbi, A, Convolutional codes and their performance in communication systems, Oct. 1971, IEEE Trans. Comm. Technology, vol. COM19, No. 5, p. 751-772.
Heller, J. A. et al., Viterbi decoding for satellite and space communication, Oct. 1971, IEEE Trans. COmm. Technology, vol. COM19, No. 5, p. 835-848.
Viterbi, A. J. et al., Principles of digital communication and coding, 1979, McGraw-Hill Book Company, NY, p. 227-300 & 411-430.
Hessel, C, High performance waveform, MIL-STD-188-181B and MIL-STD-188-184: their differences, similarities and applications,2001, IEEE, p. 14881494.
Hessel et al., High speed data waveform over bandlimited channels, 1997, IEEE, p. 530-534.
Hui-Ling Lou, Linear distance as branch metrics for Viterbi decoding of trellis codes, 2000, IEEE, p. 3267-3270.
Kevin C. Kreitzer, Tracking parameter selection for MIL-STD-188-181B multi-H continuous phase modulation, 1999, IEEE, p. 1-5.
Chase Shelly
Duane Morris LLP
Harris Corporation
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