Patent ID: 6173004
Filing Date: 2001-01-09
Classification: H04B

Abstract:
A frequency hopping communication device that performs communications with a remote frequency hopping communication device, comprising:a data communicating circuit that is capable of communicating data with a remote frequency hopping communication device; anda frequency slot switching circuit that sequentially changes a frequency slot according to a frequency hopping pattern, said frequency slot switching circuit including a timing circuit that fixes a dwell time at each frequency slot, a hopping pattern table that stores a frequency hopping pattern indicating frequency slots in a predetermined order, and a frequency slot selection circuit that selects the frequency slots in the order indicated in said hopping pattern table,wherein the dwell time during a synchronization acquisition is shorter than the dwell time during a synchronization tracking, the synchronization acquisition being started, when the data communication circuit receives data from the remote frequency hopping communication device, to acquire synchronization of the frequency slot with the remote frequency hopping communication device, the synchronization tracking being performed when communications with the remote frequency hopping communication device are established after the synchronization acquisition,wherein said timing circuit outputs timing signals to said frequency slot selection circuit, and said frequency slot selection circuit selects, based on the timing signals, the frequency slots in the predetermined order both during the synchronization acquisition and during the synchronization tracking.