Reduction of access time delay in frequency-hopping radio systems using a direct sequence mode
First Claim
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1. A radio system comprising:
- means for employing a hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication during startup of a connection; and
means for employing a pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection.
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Abstract
In a radio system that employs frequency hopping (FH), access time delay is reduced, without compromising processing gain, by adding direct-sequence (DS) spreading to the system. This results in a hybrid FH/DS system, wherein the use of DS spreading permits a reduction in the number of hop frequencies used during start-up. Once synchronization is achieved, pure FH spreading, rather than the hybrid FH/DS spreading, along with a greater number of hop frequencies are used.
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Citations
28 Claims
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1. A radio system comprising:
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means for employing a hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication during startup of a connection; and
means for employing a pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus comprising:
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means for employing a hybrid frequency hopping/direct sequence spread-spectrum mode of communication during a first mode of operation on a connection; and
means for employing a pure frequency hopping spread-spectrum mode of communication during a second mode of operation of the connection, wherein a first hop sequence for use by the hybrid frequency hopping/direct sequence spread-spectrum mode of communication consists of fewer hop frequencies than are defined by a second hop sequence for use by the pure frequency hopping spread-spectrum mode of communication.
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15. A method of operating a transceiver in a radio system, comprising the steps of:
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employing a hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication during startup of a connection; and
employing a pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
the step of employing the hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication during startup of the connection utilizes a first hop rate;
the step of employing the pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection uses a second hop rate; and
the first hop rate is a multiple of the second hop rate.
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25. The method of claim 15, wherein the step of employing the pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection uses a hop sequence that comprises at least 75 hop frequencies.
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26. The method of claim 15, wherein:
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the step of employing the hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication during startup of the connection utilizes a first hop sequence;
the step of employing the pure frequency hopping spread-spectrum transmission mode of communication during a connected mode of the connection uses a second hop sequence; and
the first hop sequence consists of fewer hop frequencies than are defined by the second hop sequence.
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27. The method of claim 26, wherein the hybrid frequency hopping/direct sequence spread-spectrum transmission mode of communication has a processing gain that equals or just exceeds 17 dB.
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28. A method of operating a transceiver in a radio system, comprising the steps of:
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employing a hybrid frequency hopping/direct sequence spread-spectrum mode of communication during a first mode of operation on a connection; and
employing a pure frequency hopping spread-spectrum mode of communication during a second mode of operation of the connection, wherein a first hop sequence for use by the hybrid frequency hopping/direct sequence spread-spectrum mode of communication consists of fewer hop frequencies than are defined by a second hop sequence for use by the pure frequency hopping spread-spectrum mode of communication.
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Specification