Frequency hopping communication device
First Claim
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1. 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; and
a 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.
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Abstract
Frequency hopping communication devices have a frequency slot switching circuit for sequentially switching the frequency slots used for transmission and reception according to a frequency hopping pattern. The communication devices also include a timing circuit for setting the dwell time for each frequency slot. The timing circuit sets a shorter dwell time during acquisition operations than the dwell time used during tracking. Hence, the receiver can more quickly detect the frequency slot used by the transmitter and acquire synchronization in a shorter time.
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Citations
21 Claims
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1. A frequency hopping communication device that performs communications with a remote frequency hopping communication device, comprising:
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a data communicating circuit that is capable of communicating data with a remote frequency hopping communication device; and
a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A spread spectrum communication system comprising:
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a transmitter including;
a first transceiver circuit, a first input connected to said first transceiver circuit, said first input applying transmission data to said first transceiver circuit, a first frequency slot switching circuit that sequentially changes a frequency slot according to a frequency hopping pattern, and a first antenna, the transmission data being transmitted by said first transceiver circuit via said first antenna using the frequency slot sequentially changed by said first frequency slot switching circuit; and
a receiver including;
a second transceiver circuit, a second frequency slot switching circuit that sequentially changes a frequency slot according to the frequency hopping pattern, said second frequency slot switching circuit including a timing circuit that fixes a dwell time at each frequency slot, wherein the dwell time during a synchronization acquisition is shorter than the dwell time during a synchronization tracking, the synchronization acquisition being performed to acquire synchronization of the frequency slot with said transmitter, the synchronization tracking being performed when communications with said transmitter are established after synchronization acquisition, and a second antenna, the transmission data being received by said second transceiver circuit via said second antenna using the frequency slot sequentially changed by said second frequency slot switching, wherein each of said first frequency slot switching circuit and said second frequency slot switching circuit further includes 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, and wherein said timing circuit outputs timing signals to said frequency slot selection circuit in said second frequency slot circuit, and said frequency slot selecting circuit switching circuit selects, based on the timing signals, the frequency slots in the predetermined order both during the synchronization acquisition and during the synchronization tracking. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A spread spectrum communication system comprising:
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a transmitter including;
a first transceiver circuit, a first input connected to said first transceiver circuit, said first input applying transmission data to said first transceiver circuit, a first frequency slot switching circuit that sequentially changes a frequency slot according to a frequency hopping pattern, and said first circuit slot switching circuit including a first timing circuit that sets a dwell time at each frequency to a predetermined period of time, and a first antenna, the transmission data being transmitted by said first transceiver circuit via said first antenna using the frequency slot sequentially changed by said first frequency slot switching circuit; and
a receiver including;
a second transceiver circuit, a second frequency slot switching circuit that sequentially changes a frequency slot according to the frequency hopping pattern, said second frequency slot switching circuit including a second timing circuit that sets a dwell time at each frequency slot so that the dwell time during a synchronization tracking has a period of time equal to the predetermined period of time and so that the dwell time during a synchronization acquisition has a period of time shorter than the predetermined period of time, the synchronization acquisition being performed to acquire synchronization of the frequency slot with said transmitter, the synchronization tracking being performed when communications with said transmitter are established after the synchronization acquisition, and a second antenna, the transmission data being received by said second transceiver circuit via said second antenna using the frequency slot sequentially changed by said second frequency slot switching circuit, wherein each of said first frequency slot switching circuit and said second frequency slot switching circuit further includes 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, and wherein each of said first and second timing circuits outputs timing signals to a corresponding frequency slot selection circuit, and said frequency slot selection circuit in said first frequency slot switching circuit selecting, based on the timing signals, the frequency slots in the predetermined order, said frequency slot selection circuit in said second frequency slot switching circuit selecting, based on the timing signals, the frequency slots in the predetermined order both during the synchronization acquisition and during the synchronization tracking. - View Dependent Claims (20, 21)
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Specification