Method and apparatus for rapid synchronization of shift register related symbol sequences

摘要

A sequence generator implemented on a receiver is synchronized with a sequence generator at a transmitter. The receiver receives k n-state symbols, with k>1 and n>1 wherein each of the k n-state symbols is associated with a generating state of the sequence generator at the transmitter. A processor in the receiver evaluates an n-state expression that generates an n-state symbol that is associated with a synchronized state of the receiver. Coefficients related to the n-state expression are stored on a memory and are retrieved by the processor. The synchronized state in one embodiment is part of a code hop. The sequence generator in the receiver may be part of a descrambler, of a communication device, of a data storage device and/or of an opening mechanism.

主权项

1. A method for activating a device by a sequence of symbols, each symbol being represented by a signal, comprising:
activating a transmitter to retrieve a first code from a plurality of codes in a memory on the transmitter, the first code determining a first sequence of symbols on the transmitter; transmitting by the transmitter of the first code to a receiver; configuring on a processor in the receiver, a sequence detector in a first configuration, the first configuration is retrieved, based on the first code, from a plurality of detector configurations stored in a memory on the receiver; transmitting by the transmitter of the first sequence of symbols to the receiver;processing the first sequence of symbols by the sequence detector in the first configuration on the processor on the receiver; and
activating the device when a presence of the first sequence of symbols is detected by the sequence detector in the first configuration on the processor on the receiver.