Multiple cavity tuning of a transmitter output in a communication system
First Claim
1. A base-site in a frequency hopping communication system, the base-site comprising:
- a plurality of transmitters each transmitting variable frequency signals at an output; and
a set of frequency responsive means, coupled to the output of each transmitter, for selectively frequency-tuning a transmitted signal, each frequency responsive means in the set of frequency responsive means tuned to a predetermined frequency and having an output coupled to a common antenna,whereby each transmitter transmits a signal at a predetermined frequency such that no common predetermined frequencies are transmitted via the common antenna at the same time.
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Accused Products
Abstract
A base-site (304) combines baseband frequency hopping and fast-synthesizer hopping to produce an economical frequency hopping communication system (300). The base-site (304) combines the fast-synthesizer frequency hopping capability of transmitters (307-309) with baseband frequency hopping to produce a frequency hopping communication system (300) which serves the same number of subscribers served by transmitters (208-213) in a purely baseband hopping communication system (200), but with fewer transmitters (307-309). The implementation of frequency-selective cavities (312-317) having very low loss eliminates the need for wideband hybrid combiners (112-114), which in turn eliminates transmitted-signal power loss experienced in a purely fast-synthesizer frequency hopping communication system (100).
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Citations
24 Claims
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1. A base-site in a frequency hopping communication system, the base-site comprising:
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a plurality of transmitters each transmitting variable frequency signals at an output; and a set of frequency responsive means, coupled to the output of each transmitter, for selectively frequency-tuning a transmitted signal, each frequency responsive means in the set of frequency responsive means tuned to a predetermined frequency and having an output coupled to a common antenna, whereby each transmitter transmits a signal at a predetermined frequency such that no common predetermined frequencies are transmitted via the common antenna at the same time. - View Dependent Claims (2, 3, 4)
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5. A base-site in a frequency hopping time-division multiple access (TDMA) communication system, the base-site comprising:
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a plurality of transmitters each transmitting variable frequency signals at an output during a TDMA timeslot; and a set of frequency responsive means, coupled to the output of each transmitter, for selectively frequency-tuning a transmitted signal, each frequency responsive means in the set of frequency responsive means tuned to a predetermined frequency and having an output coupled to a common antenna, whereby each transmitter transmits a signal at a predetermined frequency during a TDMA timeslot such that no common predetermined frequencies are transmitted via the common antenna during the same TDMA timeslot. - View Dependent Claims (6, 7, 8)
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9. A base-site in a frequency hopping time-division multiple access (TDMA) communication system for transmitting a plurality of signals having different frequencies via a common antenna, the common antenna serving a plurality of subscribers in one coverage area of the communication system, the base-site comprising:
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a plurality of transmitters for transmitting the plurality of signals to the subscribers during TDMA timeslots; means for interconnecting the plurality of transmitters; a set of frequency responsive means, coupled to the output of each of the plurality of transmitters, for selectively frequency-tuning a transmitted signal, each frequency responsive means in the set of frequency responsive means tuned to a predetermined frequency and having an output coupled to a common antenna means, via the means for interconnecting, for instructing each of the plurality of transmitters to transmit a signal tuned to the predetermined frequency of its corresponding frequency responsive means to a subscribers during a TDMA timeslots. - View Dependent Claims (10)
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11. A method of transmission in a frequency hopping communication system, the method comprising the steps of:
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transmitting, via a transmitter, first and second variable frequency signals at an output; and selectively frequency-tuning the first and second variable frequency signals. - View Dependent Claims (12, 17)
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13. A method of transmission in a frequency hopping communication system, the method comprising the steps of:
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transmitting first and second variable frequency signals via a transmitter; and selectively frequency-tuning the first and second variable frequency signals for transmission to a subscriber via a common antenna, whereby the transmitter frequency hops between the first and second variable frequency signals during transmissions to the subscriber via the common antenna. - View Dependent Claims (14, 15, 16)
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18. A base-site in a frequency hopping communication system, the base-site comprising:
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a plurality of transmitters each transmitting variable frequency signals at an output; and a set of frequency responsive means, coupled to the output of each transmitter, for selectively frequency-tuning a transmitted signal. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification