Reception system for summation of phased antenna signals
First Claim
Patent Images
1. A reception system for frequency modulated or phase modulated high frequency signals for vehicles comprising:
- a multi antenna system, comprising at least two antennas (A1, A2);
at least one individually adjustable phase rotation element Φ
1 situated in a reception path of at least one of said at least two antennas;
a linear combination circuit (5) for combining signals from said at least two antennas;
a receiver circuit (2) for receiving signals from at least one of said at least two antennas;
at least one individually adjustable switching element (S1, S2) for switching through or interrupting a signal flow from at least one of said at least two antennas, wherein said at least one switching element is positioned in a signal path of at least one of said at least two antennas;
wherein said at least one individually adjustable phase rotation element and said at least one individually adjustable switching element are in communication with said linear combination circuit (5) to form a combined signal wherein said combined signal is passed to said receiver circuit (2);
a selection device (14) disposed in said receiver circuit (2) for extensively separate determination of said reception signal and for determination of a noise signal (21) of said combined signal, for separate determination of a useful signal level (4) and a noise signal level (23);
a plurality of test circuits implemented by settings of said switching element and at least one individually adjustable phase rotation element at a period Tz of the test circuits of less than approximately 100 symbol lengths of the data signal to be transmitted;
a logic unit (7) for subsequent determination of a signal-to-noise ratio (SNR);
wherein said logic unit is configured to determine useful signal levels of the individual reception signals (e1, e2) by performing the following steps;
conducting a test cycle;
switching said individually adjustable switching element of only one reception signal (E1, E2) in each instance of said at least two antennas, within a scope of said test cycle, wherein as a criterion for the further setting process, only those signals are selected wherein a signal to noise ratio (SNR) exceeds a required minimum measure;
recording phase deviations of the useful reception signals (4) from one another in a fixed text cycle time interval (Tz) that are sufficiently small in comparison with a ratio of a wavelength to a travel speed, wherein said step of determining phase deviations occurs one after the other to determine phase deviations for each successive antenna;
setting said phase rotation elements (Φ
1, Φ
2), controlled by said logic control circuit (7), so that all of a set of useful reception signals of said reception signals assume a substantially common phase.
1 Assignment
0 Petitions
Accused Products
Abstract
A diversity antenna system and method comprising a plurality of antennas, a plurality of switches and a plurality of phase shifters, wherein the switches and the antennas are selectively opened and closed or switched on an off to achieve equiphasing. This system separates the noise signal from the useful signal in order to achieve a proper determination of the different phases. In addition there is a receiver which is configured to receive the output of the diversity system. The logic control unit is configured to perform particular steps or algorithms in order to achieve equiphasing of the received signals.
-
Citations
20 Claims
-
1. A reception system for frequency modulated or phase modulated high frequency signals for vehicles comprising:
-
a multi antenna system, comprising at least two antennas (A1, A2); at least one individually adjustable phase rotation element Φ
1 situated in a reception path of at least one of said at least two antennas;a linear combination circuit (5) for combining signals from said at least two antennas; a receiver circuit (2) for receiving signals from at least one of said at least two antennas; at least one individually adjustable switching element (S1, S2) for switching through or interrupting a signal flow from at least one of said at least two antennas, wherein said at least one switching element is positioned in a signal path of at least one of said at least two antennas; wherein said at least one individually adjustable phase rotation element and said at least one individually adjustable switching element are in communication with said linear combination circuit (5) to form a combined signal wherein said combined signal is passed to said receiver circuit (2); a selection device (14) disposed in said receiver circuit (2) for extensively separate determination of said reception signal and for determination of a noise signal (21) of said combined signal, for separate determination of a useful signal level (4) and a noise signal level (23); a plurality of test circuits implemented by settings of said switching element and at least one individually adjustable phase rotation element at a period Tz of the test circuits of less than approximately 100 symbol lengths of the data signal to be transmitted; a logic unit (7) for subsequent determination of a signal-to-noise ratio (SNR); wherein said logic unit is configured to determine useful signal levels of the individual reception signals (e1, e2) by performing the following steps; conducting a test cycle; switching said individually adjustable switching element of only one reception signal (E1, E2) in each instance of said at least two antennas, within a scope of said test cycle, wherein as a criterion for the further setting process, only those signals are selected wherein a signal to noise ratio (SNR) exceeds a required minimum measure; recording phase deviations of the useful reception signals (4) from one another in a fixed text cycle time interval (Tz) that are sufficiently small in comparison with a ratio of a wavelength to a travel speed, wherein said step of determining phase deviations occurs one after the other to determine phase deviations for each successive antenna; setting said phase rotation elements (Φ
1, Φ
2), controlled by said logic control circuit (7), so that all of a set of useful reception signals of said reception signals assume a substantially common phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A process for obtaining a maximal signal to noise ratio of a received signal in a diversity antenna system comprising the following steps:
-
providing a multi antenna system, comprising 4 leas two antennas (A1, A2); positioning at least one individually adjustable phase rotation element Φ
1 in a reception path of at least one of said, at least two antennas;providing a linear combination circuit (5) for combining signals from said at least two antennas; providing a receiver circuit (2) for receiving signals from at least one of said at least two antennas, wherein at least one individually adjustable switching element (S1, S2) for switching through or interrupting a signal flow from at least one of said at least two antennas, wherein said at least one switching element is positioned in a signal path of at least one of said at least two antennas, and wherein said at least one individually adjustable phase rotation element and said at least one individually adjustable switching element are in communication with said linear combination circuit (5) to form a combined signal wherein said combined signal is passed to said receiver circuit (2); providing a selection device (14) disposed in said receiver circuit (2) for extensively separate determination of said reception signal and for determination of a noise signal (21) of said combined signal, for separate determination of a useful signal level (4) and a noise signal level (23); providing a plurality of test circuits implemented by settings of said switching element and at least one individually adjustable phase rotation element at a period Tz of the test circuits of less than approximately 100 symbol lengths of the data signal to be transmitted; and providing a logic unit (7) for subsequent determination of a signal-to-noise ratio (SNR), wherein said logic unit is configured to determine useful signal levels of the individual reception signals (e1, e2) by performing the following steps; conducting a test cycle; switching said individually adjustable switching element of only one reception signal (e1, e2) in each instance of said at least two antennas, within a scope of said test cycle, controlled by said logic control unit (7), wherein as a criterion for the further setting process, only those signals are selected wherein a signal to noise ratio (SNR) exceeds a required minimum measure; recording phase deviations of the useful reception signals from one another in a fixed text cycle time interval (Tx) that are sufficiently small in comparison with a ratio of a wavelength to a travel speed, wherein said step of determining phase deviations occurs one after the other to determine phase deviations for each successive antenna; and setting said phase rotation elements (p1, p2), controlled by said logic control circuit, so that all of a set of useful reception signals of said reception signals assume a common phase in the form of a nominal phase, resulting in a maximal signal to noise ratio.
-
Specification