Abstract: A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. Upon reception, the acknowledgment signal is correlated using a multiplicity of correlators. An increased margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.

Abstract: A synchronization method and apparatus for synchronizing a receiver, such as a radiotelephone operable in a cellular communication system with a transmitter. Synchronization signals are transmitted as parts of a control signal to the receiver. Such synchronization signals are of high margins and also permit synchronization of the radiotelephone responsive to a reduced number of calculations. The time for such synchronization is reduced by use of nonlinear transformation metrics, such as logarithmic metrics, which reduce the impact of a noise or error component within the control signal.

Abstract: A synchronization method and apparatus for synchronizing a receiver, such as a radiotelephone operable in a cellular communication system with a transmitter. A synchronization signal is transmitted within a multiframe of a control signal to the receiver, which upon powering up detects an undifferentiated digital bit stream and divides the bits into a succession of discrete portions or bins. Energy accumulations within each such portion are calculated, and a space-profile metric of those portions falling within a synchronization burst pattern computed. Space-profile metrics of adjacent portions are also computed. Taking the differences between a given portion and portions prior to and after the given portion, a difference metric is utilized to better predict the occurrence of a multiframe boundary, facilitating synchronization, despite the presence of other high-power bursts within the transmission.