Albert J Leitich

48767409, Oct 24, 1989

Feb 13, 1989

7/310013

Stephen N. Levine - Chicago IL
Albert J. Leitich - Chicago IL

Motorola, Inc. - Schaumburg IL

H04Q 704

455 33

A cellular radiotelephone system is disclosed in which the signalling protocol for the system is embedded in the frame synchronization of the digital messages transmitted on the system. Multiple functions are accomplished by the synchronization signal and include call supervision, mode definition, and data frame synchronization. The synchronization signal is a high auto correlation, low cross correlation sequence of a predetermined number of data bits. Different bit sequences may be employed as a synchronization signal while conveying call supervision information defining the serving fixed site. Additionally, the logical inverse of the synchronizing signal may be utilized interchangably with the synchronizing signal to define the fixed site. A repetitive pattern of synchronizing signals and logical inverse synchronizing signals convey system mode information without increasing signalling overhead or losing the correlation performance of the full synchronization word.

40328864, Jun 28, 1977

Dec 1, 1975

5/636472

John En - Palatine IL
Albert Joseph Leitich - Chicago IL

Motorola, Inc. - Schaumburg IL

G06F 1112

3401461AQ

A system for processing a digital information bit stream and generating a data bit stream. The processing includes convolutional burst error correction encoding which is capable of correcting burst errors of length 2B, where B is any positive integer. Inherent in such systems are the requirements of 2B and 5B zero level bits at the beginning, and end, respectively, of the data bit stream. The processing further includes encoding n sync bits at the beginning of the data bit stream. The improvement includes encoder apparatus for replacing the 2B zero bits with the n sync bits; and, decoder apparatus for detecting a threshold number of sync bits and, in response thereto, replacing each sync bit with a zero bit. This improvement significantly reduces the number of bits otherwise required in the data bit stream. Modifications render the system suitable for processing time diversity data transmissions, or for concatenating sync bits at the conclusion of each message in a fixed length, sequential message transmission system.