Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-07-01
1999-12-28
Hudspeth, David R.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455298, H04B 110
Patent
active
060093374
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an interference-protected method for supplying power to a receiver in a cellular radio system, said method being employed at a base station in a cellular radio system, said base station comprising main devices, peripheral devices, and an antenna line between the main devices and the peripheral devices, said main devices comprising at least a power supply and an antenna filter, and said peripheral devices comprising at least a masthead amplifier.
The invention also relates to an interference-protected arrangement for supplying power to a receiver at a base station of a cellular radio system, said base station comprising main devices, peripheral devices, and an antenna line between the main devices and the peripheral devices, said main devices comprising at least a power supply and an antenna filter, and said peripheral devices comprising at least a masthead amplifier.
BACKGROUND OF THE INVENTION
A base station of a cellular radio system comprises an antenna, and transmitter and receiver means. Since radio frequencies are rapidly attenuated, distorted and disturbed in conductors, the received signal is usually amplified as close to the antenna as possible. For this purpose, a masthead preamplifier, which is a peripheral device of a base station, is employed in the immediate vicinity of an antenna which is included in a base station of a cellular radio system and which is usually located in terrain. The main devices of a base station comprise, for example, one or more power supplies for supplying power to the devices included in the base station. The power supply of a masthead preamplifier is typically implemented with low-frequency alternating current or with direct current by means of a separate power supply cable between a power supply included in the main devices of a base station and a masthead preamplifier. The power supply cable is protected by a separate, conventional overvoltage protector. It is laborious to mount a power supply cable between the main devices of a base station and a masthead preamplifier. Costs result from both the installation work and the cable itself. In addition, the overvoltage protector required by the power supply cable often cannot be sufficiently well implemented and causes extra work and costs.
CHARACTERISTICS OF THE INVENTION
The object of the present invention is to provide power supply for a base station in such a way that the installation of a separate power supply cable is avoided and the overvoltage protection is improved.
This is achieved with a method of the type described in the introduction, which is characterized by supplying operational voltage from a main device to a peripheral device of the base station through the antenna line, separating the operational voltage supplied on the antenna line and a signal from the antenna from each other in a peripheral device by filtering, and conducting overvoltage formed on the antenna line to the ground through a 1/4 wave length impedance matching stub operating on the radio frequencies used by the base station.
The power supply arrangement of the invention is characterized in that the antenna line is arranged to supply operational voltage from the main devices to the peripheral devices, the peripheral device comprises filter means for separating operational voltage supplied to the antenna line and a signal from the antenna from each other, and the 1/4 wave length impedance matching stub operating on the radio frequencies employed by the base station is arranged to conduct overvoltages to the ground.
The method of the invention has significant advantages. The solution of the invention allows the number of cables to be reduced, whereby a smaller number of components are needed in the overvoltage protection and the overvoltage protection is enhanced. This reduces the overall costs.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described in greater detail with reference to the examples illustrated in the accompanying drawings, in which
FIG. 1
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Mettovaara Tarmo
Saukko Kari
Vaisanen Hannu
Hudspeth David R.
Lerner Martin
Nokia Telecommunications Oy
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