ANTENNA DIVERSITY SYSTEM FOR RELATIVELY BROADBAND BROADCAST RECEPTION IN VEHICLES
First Claim
1. An antenna diversity system for receiving broadcast reception in vehicles, which comprises:
- a receiver having an input and an output;
a multi-antenna system having a plurality of antennas and an output comprising a reception signal for each of said plurality of antennas;
a signal selection switch having an input for receiving at least two reception signals from said plurality of antennas, said signal selection switch for selection of a different reception signal, in terms of diversity, and wherein said signal selection switch has an output in a form of a selected reception signal which is passed to said receiver; and
a diversity processor, which assesses a signal quality of the selected reception signal arriving at said receiver, and which is configured to activate said signal selection switch to pass a different reception signal, in terms of diversity, to said receiver, if interference occurs, by switching over, wherein said diversity processor is configured to receive said selected reception signal that is present in said receiver, having the relatively great frequency bandwidth B;
and wherein said diversity processor is configured to determine a signal quality of said selected reception signal, by dividing its frequency bandwidth B into frequency intervals (Δ
f), within which the frequency components of said selected reception signal (17) are essentially constant, in each instance, when multi-path propagation is present;
wherein said processor comprises a frequency-interval-selective level detection component wherein said detection component separately detects a set of components of said selected reception signal that occur in said frequency intervals as frequency-interval-specific level values,wherein said processor comprises;
an evaluation circuit wherein said set of components of said selected reception signal are separately compared with a signal level threshold that is required for interference-free reception, in said evaluation circuit that is a frequency-interval-specific level evaluation, and the interference rate of said selected reception signal is determined by means of evaluation of these measurements over all the frequency intervals (Δ
f),wherein if interference is detected, said processor passes a different reception signal, in terms of diversity, in a form of a different selected reception signal having a lowest interference rate, to said receiver.
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Abstract
There is disclosed an antenna diversity system for relatively broadband broadcast reception in vehicles such as motor vehicles. The device can include a diversity processor having numerous components including a microprocessor for controlling a signal selection switch. In alternative embodiments the processor can be incorporated into a receiver or into a multi-antenna system. One advantage of these designs is that it is able to exist with one reception tuner and being able to select one signal from a plurality of antenna signals A1, A2, . . . AN, with great probability, whose signal components lie above the level necessary for interference-free reception, over the entire channel bandwidth B.
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Citations
23 Claims
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1. An antenna diversity system for receiving broadcast reception in vehicles, which comprises:
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a receiver having an input and an output; a multi-antenna system having a plurality of antennas and an output comprising a reception signal for each of said plurality of antennas; a signal selection switch having an input for receiving at least two reception signals from said plurality of antennas, said signal selection switch for selection of a different reception signal, in terms of diversity, and wherein said signal selection switch has an output in a form of a selected reception signal which is passed to said receiver; and a diversity processor, which assesses a signal quality of the selected reception signal arriving at said receiver, and which is configured to activate said signal selection switch to pass a different reception signal, in terms of diversity, to said receiver, if interference occurs, by switching over, wherein said diversity processor is configured to receive said selected reception signal that is present in said receiver, having the relatively great frequency bandwidth B; and wherein said diversity processor is configured to determine a signal quality of said selected reception signal, by dividing its frequency bandwidth B into frequency intervals (Δ
f), within which the frequency components of said selected reception signal (17) are essentially constant, in each instance, when multi-path propagation is present;wherein said processor comprises a frequency-interval-selective level detection component wherein said detection component separately detects a set of components of said selected reception signal that occur in said frequency intervals as frequency-interval-specific level values, wherein said processor comprises; an evaluation circuit wherein said set of components of said selected reception signal are separately compared with a signal level threshold that is required for interference-free reception, in said evaluation circuit that is a frequency-interval-specific level evaluation, and the interference rate of said selected reception signal is determined by means of evaluation of these measurements over all the frequency intervals (Δ
f),wherein if interference is detected, said processor passes a different reception signal, in terms of diversity, in a form of a different selected reception signal having a lowest interference rate, to said receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An antenna diversity system for receiving broadcast reception signals comprising:
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a) a multi-antenna system comprising a plurality of antennas, said multi-antenna system comprising; i) at least one high frequency line; ii) at least one signal selection switch having its input coupled to said multi antenna system, and its output coupled to said high frequency line; iii) an address signal generator coupled to said high frequency line to receive a coded address signal, wherein said address signal controls said signal selection switch; b) a receiver comprising; i) a pilot amplitude detection; ii) a microcontroller; and iii) an IF broadband band-pass with a level detector, to produce an expanded receiver, wherein a level of an IF signal at an output of said IF broadband band-pass with level detector is detected in a form of an HF-channel-specific level value, which, together with a set of frequency-interval-specific level values, is passed to said microcontroller for updating a ranking list, and for configuring said coded address signal for said antenna signal to be selected, and wherein said coded address signal is transmitted, by way of said high-frequency line; wherein if interference is detected, said address signal generator switches said signal selection switch to pass a different reception signal, in terms of diversity, in a form of a selected reception signal having a lowest interference rate, to said receiver.
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21. An antenna diversity system for receiving broadcast reception signals comprising:
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a) a multi-antenna system comprising a plurality of antennas said multi-antenna system comprising; i) at least one high frequency line; ii) at least one signal selection switch having an input coupled to an output of said plurality of antennas, and its output coupled to said high frequency line; iii) at least one signal pre-selection switch having an input coupled to an output of said plurality of antennas; iv) a microcontroller, which is configured to control said at least one signal pre-selection switch and which generates and sends an address signal to said signal selection switch for selecting an antenna signal; v) an IF narrowband band-pass; vi) a frequency converter, in communication with said at least one signal pre-selection switch, wherein said antenna signals which are passed from said at least one signal pre-selection switch are alternately passed to said IF narrowband band-pass, based upon signals having a bandwidth of a frequency interval Δ
f, by way of said frequency converter which, for frequency conversion, is turned on with a frequency interval selection signal for step-by-step detection of a reception channel B, controlled by said microcontroller, offset relative to an oscillator signal, in terms of frequency, in steps of a multiple of the frequency interval Δ
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so that said IF narrowband band-pass outputs a frequency-interval-specific level value of the antenna signal in question to said microcontroller, in each instance, such that said microcontroller generates said current address signal and a ranking list from said frequency-interval-specific level value; andb) a receiver comprising; i) a plurality of selection devices, wherein said receiver has an oscillator signal and a cycle signal which is passed, by way of said selection devices, and by way of said high-frequency line, to said multi-antenna system; wherein if interference is detected, said microcontroller switches said signal selection switch to pass a different reception signal, in terms of diversity, in a form of a selected reception signal having a lowest interference rate, to said receiver. - View Dependent Claims (22, 23)
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Specification