Antenna diversity system for radio reception for motor vehicles
First Claim
Patent Images
1. An antenna diversity system for radio reception comprising:
- a) a receiver;
b) a plurality of antennas;
c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas;
d) a high frequency line coupled to said receiver;
e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising;
i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path;
ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit;
iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit;
f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch;
wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position;
said system further comprising an electronic control device having a memory, for coordinated setting of discrete phase rotation angles φ
i of said at least one phase rotation device wherein said angles are assigned in a fixed manner to a particular switching position of said addressable logic signal selection switch, and wherein each of said phase rotation angles are stored in a memory of said electronic control device as a phase vector, wherein a phase value matrix of discrete phase rotation angles φ
i is stored in said control device by way of said switching positions, wherein if interference occurs in a summed signal, an interference indicator signal of said evaluation circuit is passed to said electronic control device in the form of a different coordinated setting resulting in the selection of a different coordinated setting for said at least one addressable logic signal selection switch.
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Abstract
An antenna diversity system for radio reception for motor vehicles, which comprises a multi-antenna system having several antennas with antenna feed lines. There can be a diversity switching device for selection of a different reception signal, and an evaluation circuit which evaluates the reception quality of the reception signal just arriving at the receiver. This evaluation circuit is designed to bring a different reception signal in terms of diversity to the receiver if interference occurs, by switching over. This design also includes at least one phase rotation device which is disposed along at least one of the signal paths.
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Citations
25 Claims
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1. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch; wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position; said system further comprising an electronic control device having a memory, for coordinated setting of discrete phase rotation angles φ
i of said at least one phase rotation device wherein said angles are assigned in a fixed manner to a particular switching position of said addressable logic signal selection switch, and wherein each of said phase rotation angles are stored in a memory of said electronic control device as a phase vector, wherein a phase value matrix of discrete phase rotation angles φ
i is stored in said control device by way of said switching positions, wherein if interference occurs in a summed signal, an interference indicator signal of said evaluation circuit is passed to said electronic control device in the form of a different coordinated setting resulting in the selection of a different coordinated setting for said at least one addressable logic signal selection switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; and f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position, and wherein said phase rotation angle vector φ
i of said discrete phase rotation angles of said adjustable phase rotation device which is assigned to a specific switching position of said addressable signal selection switch, is formed from I≦
5 different phase rotation angles φ
i having the same angle differences of 2π
/1.
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11. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; and f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position, and wherein said antenna diversity module further comprises a diversity processor wherein said evaluation circuit for detecting reception quality transfers to an intermediate frequency signal from said receiver to said antenna diversity module, wherein said diversity processor provides for rapid recognition of interference, wherein said diversity processor creates an interference indicator signal for causing said addressable signal selection switch to set a different switching position (a=0, 1, 2, . . . N, b=0, 1, 2, . . . N) and said at least one adjustable phase rotation device to set a different discrete phase rotation angle Φ
. - View Dependent Claims (12, 13, 14)
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15. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position; and further comprising a plurality of antenna amplifiers with a high impedance front end amplifier wherein at least one antenna amplifier is coupled to an input of said first output signal path, and at least one antenna amplifier is coupled to an input of said second output signal path, and wherein said antennas are configured as passive antennas, wherein at least one antenna amplifier comprises at least one transformation circuit wherein said at least one transformation circuit can be set in a logically addressable manner, and wherein said electronic control device forms at least one address control signal, wherein a related setting for compensation of a frequency response for at least one transformation circuit is initiated in said at least one antenna amplifier, when at least one of said plurality of antennas is switched on. - View Dependent Claims (16)
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17. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position; a level transmission setting device which is coupled to at least one of said first output signal path and said second output signal path; and a level transmission value matrix for different discrete level transmission values (P a, b, I, j, where j=1, 2, . . . ) which is stored in said electronic control device having memory, wherein said matrix is for coordinating a setting of different discrete level transmission values for a combination of certain switching positions of said addressable signal selection switch, and a discrete phase rotation angle Φ
, of said at least one phase rotation device and wherein there is a level transmission setting signal formed in said level transmission setting device.
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18. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit; and f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position, and wherein said at least one adjustable phase rotation device comprises at least two phase rotation circuits having phase angles set in a fixed manner, and wherein the device further comprises a controllable phase selection switch for an alternative selection of at lease one of the output signals of said phase rotation circuits, and wherein said control device generates a phase setting signal which is passed to said at least one phase rotation device that can be set in an analog manner for setting a discrete phase rotation angle Φ
in each instance, and wherein said electronic control device also generates a logic switching signal for setting an assigned switching position, of said addressable logic signal selection switch. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. An antenna diversity system for radio reception comprising:
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a) a receiver; b) a plurality of antennas; c) a plurality of antenna feed lines forming at least one input signal path coupled to said plurality of antennas; d) a high frequency line coupled to said receiver; e) an antenna diversity module disposed external to said receiver and coupled to said plurality of antenna feed lines and to said high frequency line, said antenna diversity module comprising; i) at least one addressable logic signal selection switch comprising at least two switching devices for a selection of different antenna reception signals, said at least two switching devices in the form of at least a first switching device having its output coupled to a first output signal path and at least a second switching device having its output coupled to a second output signal path; ii) a summation circuit having an output which is coupled to said receiver and has at least two inputs coupled to said first and second signal paths, wherein at least one switching device in said at least one addressable logic signal selection switch has at least an output coupled to said summation circuit; iii) at least one phase rotation device that is disposed along at least one of said signal paths, and is disposed between said at least one addressable logic signal selection switch and said summation circuit and is pre-set in phase angle rotation, in a fixed manner wherein a reception signal of one of said plurality of antennas is switched through to one of said at least two inputs on said summation circuit and wherein with at least one of a set of switch positions of said signal selection switch, the reception signal on another one of said plurality of antennas first passes through said at least one phase rotation device which is set in a fixed manner, and then is switched through another input of said at least two inputs on said summation circuit, and f) an evaluation circuit which evaluates a quality of the reception signal and which is in communication with said at least one addressable logic signal selection switch, wherein if an interference occurs in a summed signal, said at least one evaluation circuit detects said interference and signals said addressable logic signal selection switch to select a different coordinated setting of a switching position, wherein said at least one phase rotation device is set in a fixed manner and is tied into said at least one input signal to rotate a phase angle of an antenna signal in at least one antenna feed line before said signal reaches said addressable logic selection switch, and wherein when a plurality of antennas are present in the form of N number of antennas, said at least one phase rotation device is set in a fixed manner and tied to a plurality of antenna feed lines in the form of N-1 feed lines which are coupled to said at least one addressable logic signal selection switch, wherein said at least one phase rotation device is designed as a plurality of phase rotation devices and as a plurality of low loss high frequency reactance circuits, wherein a frequency dependence of their phase values results in a greatest possible diversity efficiency at every frequency and at each instance.
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Specification