US5263047A
Expired / Lapsed
US
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Multiple cavity tuning of a transmitter output in a communication system
Assignee: Motorola Mobility LLC
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Filing: 1992-07-02
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Granted: 1993-11-16
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Expires: 2012-07-02
Abstract
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).
Inventors
- 👤 Michael D. Kotzin
- 👤 Stephen L. Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:46
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7136; H04B2001/71362
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
94 words
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.
Claim 2
Dependent Claim
94 words
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.
Claim 3
Dependent Claim
32 words
The base-site of claim 1 wherein each frequency responsive means in the set of frequency responsive means is tuned to a different frequency than any other frequency responsive means in the set.
Claim 4
Dependent Claim
38 words
The base-site of claim 1 wherein each frequency responsive means having an output coupled to the common antenna is tuned to a different frequency than any other frequency responsive means having an output coupled to the common antenna.
Claim 5
Dependent Claim
15 words
The base-site of claim 1 wherein the frequency responsive means further comprises a frequency-selective cavity.
Claim 6
Dependent Claim
107 words
A base-site in a frequency hopping time-division multiple access (TDMA) communication system, the base-site comprising: 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.
Claim 7
Dependent Claim
107 words
A base-site in a frequency hopping time-division multiple access (TDMA) communication system, the base-site comprising: 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.
Claim 8
Dependent Claim
32 words
The base-site of claim 5 wherein each frequency responsive means in the set of frequency responsive means is tuned to a different frequency than any other frequency responsive means in the set.
Claim 9
Dependent Claim
38 words
The base-site of claim 5 wherein each frequency responsive means having an output coupled to the common antenna is tuned to a different frequency than any other frequency responsive means having an output coupled to the common antenna.
Claim 10
Dependent Claim
15 words
The base-site of claim 5 wherein the frequency responsive means further comprises a frequency-selective cavity.
Claim 11
Dependent Claim
151 words
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: 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.
Claim 12
Dependent Claim
151 words
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: 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.
Claim 13
Dependent Claim
25 words
The base-site of claim 9 wherein no two subscribers are required to receive a transmission from any one transmitter during any one synchronized TDMA timeslot.
Claim 14
Independent Claim
39 words
A method of transmission in a frequency hopping communication system, the method comprising the steps of: transmitting, via a transmitter, first and second variable frequency signals at an output; and selectively frequency-tuning the first and second variable frequency signals.
Claim 15
Independent Claim
39 words
A method of transmission in a frequency hopping communication system, the method comprising the steps of: transmitting, via a transmitter, first and second variable frequency signals at an output; and selectively frequency-tuning the first and second variable frequency signals.
Claim 16
Dependent Claim
47 words
The method of claim 11 wherein the step of selectively frequency-tuning the first and second variable frequency signals further comprises the step of selectively frequency-tuning the first and second variable frequency signals via first and second fixed-frequency cavities tuned to the first and second variable frequencies respectively.
Claim 17
Independent Claim
67 words
A method of transmission in a frequency hopping communication system, the method comprising the steps of: 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.
Claim 18
Independent Claim
67 words
A method of transmission in a frequency hopping communication system, the method comprising the steps of: 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.
Claim 19
Dependent Claim
17 words
The method of claim 13 wherein the communication system is a time-division multiple access (TDMA) communication system.
Claim 20
Dependent Claim
28 words
The method of claim 13 wherein the transmitter frequency hops between the first and second variable frequency signals during transmissions to a single subscriber in successive TDMA timeslots.
Claim 21
Dependent Claim
29 words
The method of claim 13 wherein the transmitter frequency hops between the first and second variable frequency signals during transmissions to at least two subscribers in successive TDMA timeslots.
Claim 22
Dependent Claim
38 words
The method of claim 11 wherein the step of selectively frequency-tuning the first and second variable frequency signals further comprises the step of selectively frequency-tuning the first and second variable frequency signals for transmission via a common antenna.
Claim 23
Dependent Claim
43 words
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.
Claim 24
Dependent Claim
43 words
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.
Claim 25
Dependent Claim
23 words
The base-site of claim 18 wherein each frequency responsive means in the set of frequency responsive means is tuned to a predetermined frequency.
Claim 26
Dependent Claim
32 words
The base-site of claim 18 wherein each frequency responsive means in the set of frequency responsive means is tuned to a different frequency than any other frequency responsive means in the set.
Claim 27
Dependent Claim
15 words
The base-site of claim 18 wherein a frequency responsive means further comprises a frequency-selective cavity.
Claim 28
Dependent Claim
25 words
The base-site of claim 18 wherein each frequency responsive means in the set of frequency responsive means has an output coupled to a common antenna.
Claim 29
Dependent Claim
31 words
The base-site of claim 22 wherein 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.
Claim 30
Dependent Claim
38 words
The base-site of claim 22 wherein each frequency responsive means having an output coupled to the common antenna is tuned to a different frequency than any other frequency responsive means having an output coupled to the common antenna.
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