United States Patent m
Roney, IV
[54] DECODER SELECTION
[75] Inventor: Edward M. Roney, IV, Grayslake, El.
[73] Assignee: Motorola, Schaumburg, El.
[21] Appl. No.: 386,248
[22] Filed: Feb. 9,1995
Related U.S. Application Data
[63] Continuation of Set. No. 26,835, Mar. 5, 1993, abandoned.
[51] Int. CI.6 G06F 11/10; H03M 13/00
[52] U.S. CI 371/41; 371/5.1; 371/43;
455/39; 375/316; 375/341
[58] Field of Search 371/5.1, 5.4, 5.5,
371/30, 41, 43; 455/56.1, 54.1, 39; 375/340, 261, 225, 243, 316, 341, 343
[56] References Cited
U.S. PATENT DOCUMENTS
3,078,443 2/1963 Rose 371/41
4,701,923 10/1987 Fukasawaetal 371/41
5,051,999 9/1991 Erhart et al 371/41
5,060,266 10/1991 Dent 380/50
Primary Examiner—-Robert W. Beausoliel, Jr.
Assistant Examiner—Albert Decady
Attorney, Agent, or Firm—Kevin D. Kaschke
[57] ABSTRACT
The process of the present invention receives encoded data over a channel, decodes the data, and estimates the number of errors induced by the channel. The proper convolutional decoder is chosen by comparing the bit error rates to a threshold that is biased in favor of the FACCH message being present on the channel. The selection process of the present invention requires reduced processing time by the processor thereby reducing the power requirements of the processor.
22 Claims, 3 Drawing Sheets
