Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
  • H04B7/0868—Hybrid systems, i.e. switching and combining
  • H04B7/0874—Hybrid systems, i.e. switching and combining using subgroups of receive antennas
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
  • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
  • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
  • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/10—Adaptations for transmission by electrical cable
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
  • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
  • H04H20/63—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]

Definitions

• the invention relates to a receiving antenna method for stationary reception with at least two individual receiving antennas / the antenna output signals of which are each separately fed to several receiving participants of a community house reception system.
• the invention further relates to a receiving antenna system for the stationary receiver for carrying out the method.
• EP-A2-0 036 139 discloses a receiving antenna method or a receiving antenna system for stationary reception with at least two individual receiving antennas.
• a changeover switch is provided which, depending on a control signal, either shifts the antenna signal by 180 ° or leaves it unaffected.
• This antenna signal which is either phase-shifted by 180 ° or left uninfluenced, is added to the antenna signal of the other antenna in an adding stage and fed to a receiver circuit which supplies an output signal to a phase selection circuit.
• the changeover switch is switched from the state in which it phase-shifts the one output signal by 180 ° to the state in which no phase shift is carried out and vice versa.
• E BLOCK Subnet known for single and community antenna systems, in which two transmission lines are provided for the separate supply of two antenna sockets per subscriber connection point.
• the house distribution network is intended for the joint reception of the terrestrial audio and television radio radio programs and one left and one right-polarized direct satellite television program.
• Each antenna socket has two outlets. One outlet of the antenna sockets fed from the transmission line for the left-polarized direct satellite television signals is for receiving the terrestrial audio broadcast signals and the other outlet of the antenna sockets fed from the transmission line for the right-polarized direct satellite television signals is for receiving the terrestrial television -Radio- provided radio signals.
• the station allocation in the FM transmission range is very dense and will also become more dense in the future due to further transmitter approvals. Therefore, the zones around the respective individual transmitter are getting smaller and smaller, in which undisturbed radio reception is possible without being influenced by other transmitters. In particular, the reception of more distant stations, which are currently broadcasting an interesting program, is considerably impaired.
• the invention is therefore based on the object of creating a receiving antenna method or a receiving antenna system in connection with communal house reception systems for stationary reception, with which or in particular also in systems of medium size for each individual subscriber can individually optimize the reception of a specific, selected transmitter.
• the object is achieved according to the invention in that the receiver antennas have different antenna diagrams and that at each receiving point the Community house reception system Receive signals can be generated and selected in an individual way.
• the individual antenna output signals of the receiving antennas with different antenna diagrams are available separately and individually to any number of receiving participants.
• the individual receiving subscriber wants to receive and optimize he is free to combine and process the individual output signals of the receiving antennas available to him for the individual optimization of the received signals for a particular transmitter. It is up to him what type of preparation and combination he chooses in each case. In borderline cases, it cannot combine or prepare the individual antenna output Make signals and select only one of the antenna output signals as the receive signal.
• Each receiving subscriber is also completely free with regard to the equipment complexity to be selected for the reception optimization. He can do without facilities for optimization, he can use a simple, hand-operated device, or he can drive a lot of effort through the use of complex diversity devices and processes.
• the evaluation of the signals of the receiving antennas made available to him with different antenna diagrams is therefore entirely at his own discretion, both in terms of equipment and in terms of equipment.
• the feature according to the invention ensures in particular that the individual antenna output signals are decorrelated and decoupled as far as possible and can therefore be used optimally, for example, for a combination, for example according to the diversity method.
• the receiving antennas comprise at least one satellite antenna.
• one or more additional coaxial cables are already available for feeding the satellite reception signals, which can be used for routing the signals from antennas of different antenna patterns without additional effort.
• the receiving antennas comprise at least two dipoles, it being particularly advantageous if the dipoles are at an angle of 90 ° to one another. In this way, a good decoration of the antenna input signals is ensured.
• REPLACEMENT LEAF A 'further advantageous embodiment of the invention is that one of the antennas is selected so that it hides a strong local transmitter. In this way it is ensured that the strong local transmitter does not dominate the combination or the diversity method, but that other transmitters are also used to optimize the received signal.
• At least one antenna is used for the reception of a near transmitter and at least one further antenna for the reception of a remote transmitter. This in turn also ensures good decorrelation of the antenna output signals and better reception of both the near transmitter and the remote transmitter.
• a dipole is selected for the nearby transmitters, that is to say for the local reception, and a directional antenna for the remote transmitter.
• at least one individual antenna responding to the electrical field and one to the magnetic field are used. Loops or ferrites, for example, can be used as signals for the magnetic field. The signals provided to the receiver circuit can thus be decorrelated for a community house system.
• a diversity method is used to evaluate the individual antenna output signals.
• Each of the known diversity methods is suitable for use in this context. It is particularly advantageous to use the diversity methods as they are known from DE-Psen 38 34 528, 38 14 899, 38 14 900 and 38 33 709, which go back to the inventors of the present invention. To avoid repetition, reference is made to these patents. It is advantageous if a combination diversity method is used to evaluate the individual antenna reception signals.
• One embodiment of the invention is that the coefficients of an adder are switched. This also results in a wide range of possible combinations for forming an optimal input signal for the receiver circuit.
• the diversity process is a selection diversity process.
• the interference phase shift, the amplitude, the noise component and / or the amplitude modulation is preferably used as the signal parameter for the selection of the received signal.
• the selection of a received signal from the multiple, optionally combined received signals as a function of at least one predefined signal parameter is selected automatically, for example by means of a diversity combiner device or a processor.
• Such an automatic device searches for the signal that delivers the best LF signal according to a common algorithm.
• the linear combination of antenna output signals it is also possible for the linear combination of antenna output signals to be set manually, for example using a goniometer.
• at least one receiver has a device which displays a signal parameter, for example a device which displays faults, for example in the form of a magic eye or the like.
• the manual selection can be supported and improved with the aid of such signal parameter or fault display devices.
• certain synthetic antenna signals are generated in a targeted manner.
• a further embodiment of the invention in connection with the use of a scanning diversity method consists in that the individual antenna output signals and / or linear combination of the antenna output signals are used for the scanning diversity method.
• a further embodiment of the invention consists in that at least one antenna signal is converted into another frequency band and the oscillator frequency required for the frequency conversion is also transmitted.
• the antenna signals appearing in different frequency bands are processed with a frequency diversity method that covers the different frequency bands.
• the task is also solved with a receiving antenna system, in which the individual receiving antennas are shared house antennas, and in which a diversity system is provided for each recipient.
• Each receiving subscriber is therefore free to choose the transmitters they want and, in particular, to make receiving antennas from the individual antenna signals and / or to make a corresponding selection. It is also up to the respective recipient to decide which type of diversity system they want to use. For example, it is also possible for individual participants to have an automatic diversity system, but for others to choose manually, for example with an additional device. As a result, all options are individually available to the receptionist.
• An advantageous embodiment of the receiving antenna system consists in that the receiving antennas comprise at least one satellite antenna, an all-round antenna and / or a directional antenna. In this way, the selection, evaluation and / or masking out of certain transmitters is possible, and it is further ensured that the antenna diagrams are different and therefore there is good decorrelation of the antennas.
• a relatively slow diversity system can be used in stationary systems, such as community house systems. Sometimes, however, the transmission and reception signals change due to changes in time or interference in the transmission path. Therefore, it is also advantageous if fast diversity systems are used so that instantaneous changes in the transmission signal and rapid variations or interference due to adjacent channel and co-channel transmitters are prevented.
• the invention is described below on the basis of a preferred embodiment for a communal house antenna system with two antennas using the example of a scanning diversity method.
• the output signals of an antenna 1 and an antenna 2 are each provided separately to the outlets 5-1, 5-2,..., 5-n of the various subscribers via a distributor or low-voltage line 3, 4.
• amplifiers 6, 7 can be provided in the distribution lines, preferably at the antenna outputs.
• a coefficient matrix 8-1, 8-2,..., 8-n is provided for the formation of a plurality of different received signals from the antenna output signals, in which the antenna output signals are combined in different ways to form new signals, which connect to the connections of a switchgear 9.
• the combinations can be amplitude combinations, phase combinations or combinations of amplitude and phase combinations. For example, it is also possible to provide empirically determined combinations.
• a combination signal applied to the contacts of the switching bank 9 is selected via a switching wheel 10 and fed to a conventional receiver circuit 11, the output of which is connected to a loudspeaker 12.
• the respective signal present at the receiver circuit 11 is monitored for specific signal parameters, for example for interference parameters.
• the interference circuit arrangement 13 emits a switching signal to the switching wheel 10, so that a different signal combination for the receiver circuit 11 is selected when a fault occurs. It is possible, for example, to also mute the receiver circuit 11, that is to say not to provide it with an input signal if more than n successive interference pulses occur.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Multimedia (AREA)
• Radio Transmission System (AREA)
• Mobile Radio Communication Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6396234

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (5)

Citations (7)

• 1989
  • 1989-12-22 DE DE19893942626 patent/DE3942626C1/de not_active Expired - Fee Related
• 1990
  • 1990-11-15 EP EP19900916725 patent/EP0506677A1/de not_active Withdrawn
  • 1990-11-15 WO PCT/EP1990/001954 patent/WO1991010299A1/de not_active Application Discontinuation

Patent Citations (7)

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