RECEPTION SYSTEM FOR SUMMATION OF PHASED ANTENNA SIGNALS

• US 20100183095A1
• Filed: 01/19/2010
• Published: 07/22/2010
• Est. Priority Date: 01/19/2009
• Status: Active Grant

• Current Assignee: Delphi Delco Electronics Europe GmbH (Aptiv PLC)
• Original Assignee: Delphi Delco Electronics Europe GmbH (Aptiv PLC)
• Inventors: LINDENMEIER, Stefan, HOPF, Jochen, REITER, Leopold, LINDENMEIER, Heinz
• Granted Patent: US 8,306,168 B2
• Time in Patent Office: Days
• US Class Current: 375/324
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0808 comparing all antennas before reception
• CPC Class Codes: H04B 7/084 Equal gain combining, only phase adjustments antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays
• CPC Class Codes: H04B 7/0874 using subgroups of receive antennas

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.

Claims

11-1. The reception system as in claim 1, further comprising a noise level indicator wherein said logic circuit is configured to perform the following steps:

wherein said step of determining a noise signal level in a combined signal within a frequency interval that lies directly adjacent to a reception frequency channel but does not contain spectral components of a signal transmitted by a satellite, wherein a frequency bandwidth of the multi-antenna system additionally covers this frequency interval;

tuning a noise level indicator to a frequency interval which is structured in a frequency selective manner, wherein said noise signal level in said reception frequency channel is representatively detected from this; and

determining a useful signal level of one of the reception signals by means of detecting its total power.

19. A process for obtaining a maximal signal to noise ratio of a received signal in a diversity antenna system comprising 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 (T_z) 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 (Φ

1, Φ

2), 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.