KR20030048995A - Wireless repeater for satellite broadcasting and method thereof - Google Patents

Abstract

PURPOSE: A wireless satellite broadcasting relay system and a wireless satellite broadcasting relay method are provided to freely receive satellite broadcasting of high quality with a small-sized terminal unit by implementing a network receiving a signal from a few relay stations and re-sending the signal, with the same frequency. CONSTITUTION: A wireless satellite broadcasting relay system includes an array antenna-receiving unit(220) receiving a signal from a superior station and analyzing the receiving angle of an interference signal; an array-received signal interference removal unit(230) detecting and removing the analyzed interference signal in the received signal; an amplification-transmitting unit(240) amplifying the interference-removed signal and transmitting the signal to a receiving terminal(250); a quality-monitoring unit(260) monitoring the quality of the transmitted signal; and a remote control unit(270) executing gain control for each signal transmission path according to the measured transmitted signal quality and executing a command of an operator. The signal frequency received from the array antenna-receiving unit is the same as the signal frequency transmitted from the amplification-transmitting unit.

Description

Wireless satellite broadcasting relay device and wireless satellite broadcasting relay method using same {WIRELESS REPEATER FOR SATELLITE BROADCASTING AND METHOD THEREOF}

The present invention relates to a wireless satellite relay apparatus and a relay method using the same, and more particularly, a wireless satellite relay apparatus for receiving a signal from a satellite station and continuously relaying the signal to a terrestrial signal relay station wirelessly connected to a terrestrial signal conversion station. It relates to a relay method using it.

Conventionally, in order to receive a broadcast signal from a satellite station, a receiver has to be provided with a high gain receiving antenna. Accordingly, there is inconvenience in using the mobile device due to the cumbersome installation cost and installation cost of the receiving device.

In addition, in a wide area broadcasting system such as satellite broadcasting, there is a problem in that a large number of satellite steering relay stations have to be established because the reception field is absolutely lacking in urban roads and buildings.

Therefore, a new wireless satellite broadcasting repeater that can receive signals from a small number of satellite steering relay stations and retransmit them at the same frequency, and can receive high-quality satellite broadcasting freely from a small terminal by supplying the appropriate signal strength in downtown and buildings. And a wireless satellite broadcasting relay method is required.

The present invention has been conceived to solve the above problems, and builds a network that receives signals from a few relay stations that steer satellites and retransmits them at the same frequency, thereby supplying a strong signal strength in downtowns and buildings to provide a compact terminal device. It is also an object of the present invention to provide a wireless satellite broadcasting relay device for freely receiving high quality satellite broadcasting.

1 is a network diagram illustrating a wireless satellite broadcasting relay device according to the present invention.

2 is a block diagram of a wireless satellite broadcast relay device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110 ... Earth Station 120 ... Satellite Station

131 ... 1st ground signal converter station 13N ... 1st ground signal converter station

131-1 ... 1-1 Ground Signal Relay Station 131-n ... 1-n Ground Signal Relay Station

13N-1 ... N-1 ground signal relay station 13N-n ... N-n ground signal relay station

Wireless satellite broadcasting relay device according to the present invention for achieving the above technical problem is received by a satellite signal from a satellite station, N ground signal conversion station for outputting; Cascade connected N ground signal relay stations for receiving a radio signal output from each terrestrial signal conversion station; A wireless satellite relay apparatus included in a terrestrial signal relay station, comprising: an array antenna receiver configured to receive a signal from an upper station and analyze a reception angle of an interference signal; An array reception signal interference cancellation unit configured to detect and remove the analyzed interference signal from the received signal; An amplifying transmitter for amplifying the signal from which the interference is removed and transmitting the amplified signal to a receiving terminal; A quality monitoring unit for monitoring the quality of the transmission signal; And a remote controller for executing gain control and an operator's command for each signal transmission path according to the measured transmission signal quality.

In a preferred embodiment, the signal frequency received by the array antenna receiver and the signal frequency transmitted by the amplifying transmitter are preferably the same.

In another preferred embodiment, the array receive signal interferer removes the feedback signal of the terrestrial signal relay station using at least one of spaced transmission and reception distances, use of directional aerials, use of orthogonal polarization, use of interference cancellation techniques by array antennas, and use of shielding between transmit and receive. do.

In another preferred embodiment, the amplification transmitter is preferably wirelessly connected to the mobile telephone network for interactive broadcast service in conjunction with an existing mobile telephone network.

In another preferred embodiment, the terrestrial signal conversion station uses a Code Division Modulation (CMD) scheme for stable reception during movement of a receiving terminal with respect to terrestrial multipath reception.

In another preferred embodiment, the terrestrial signal conversion station selects a better signal from among a plurality of array antennas and code division modulation signals received by the satellite station via a high gain aerial, and installs a remote location and a predetermined shield so that the same frequency and It is preferable to transmit to the first terrestrial signal relay station in the same modulation scheme.

DETAILED DESCRIPTION Hereinafter, the present invention will be described in detail with reference to examples, and the present invention will be described in detail with reference to the accompanying drawings. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more clearly and easily describe the present invention to those skilled in the art.

1 is a network configuration for the implementation of the wireless satellite relay device according to the present invention.

As shown in FIG. 1, the network for implementing the wireless satellite relay broadcasting apparatus according to the present invention includes an earth station 110, a satellite station 120, a ground signal conversion station 130-13N, and a ground signal relay station 131-1. 13N-n).

The earth station 110 is a component that transmits a signal to be broadcast to the satellite station 120 on the ground, and is composed of a directional aerial toward the satellite station 120 and a transmission device to transmit a signal to the satellite station 120 at a specific frequency.

The satellite station 120 is a communication device generally orbiting in a stationary satellite orbit on the equator of the earth. The satellite station 120 receives a radio wave from the earth station 110 on the earth, converts it into a signal of a different frequency, and then retransmits it to a location of a specific area on the ground. Do this.

The first ground signal conversion station 131 to the Nth ground signal conversion station 13N are a few ground signal relay stations scattered on the ground. The terrestrial signal conversion stations 131 to 13N obtain a good signal from the satellite station 120 using a high-gain aerial device such as parabola and transmit the signal in a frequency and modulation scheme that is different from the received frequency.

At this time, the reason for using a separate frequency is to prevent the degradation of the signal due to the ratio of the feedback signal of the transmission output is larger than the signal strength received from the satellite station 120.

When the ground signal converting stations 131 to 13N retransmit the signal received from the satellite station 120 to the ground signal relay stations 131-1 to 13N-n, a multipath reception phenomenon occurs. In order to prevent this phenomenon, the receiving terminal 250 preferably uses a code division modulation scheme for the separate modulation scheme.

The first terrestrial signal relay station 131-1 to the Nn terrestrial signal relay station 13N-n receive signals received from the first terrestrial signal conversion station 131 or the Nth terrestrial signal conversion station 13N at the same frequency. And radiate back into space.

Since the signal received by the ground signal conversion stations 131 to 13N is closer than that received by the satellite station 120, a strong signal may be received. Therefore, even when retransmitted with the same frequency signal, it is possible to amplify the signal with sufficient signal strength to be received by the terrestrial receiving terminal 250 with a slight separation between transmission and reception.

In this case, it is preferable to use a transmission / reception separation method such as sectorization of the receiving aerial, spatial separation and shielding, interference signal processing by an array antenna, and use of orthogonal polarization of transmission and reception.

The nth terrestrial signal relay station 131-n to 13N-n is the same as the first terrestrial signal relay station 131-1 in configuration and operation, and the upper station 131-n-1 to 13N-n-before relaying. It is preferable to extend the service area in association by receiving a signal from 1) and transmitting it to the receiving terminal 120 or by retransmitting a satellite reception signal to the next lower station (131-n + 1 to 13N-n + 1). Do. In this case, the transmission / reception polarization configuration to be used may be orthogonal to the upper station 131-n-1 to 13N-n-1 or the lower station 131-n + 1 to 13N-n + 1 to improve the signal-to-noise ratio. More preferred.

2 is a configuration diagram of an n-th ground signal relay station according to the present invention.

As shown in Figure 2, the n-th ground signal relay station (131-n ~ 13N-n) according to the present invention is the array antenna receiver 220, array received signal interference cancellation unit 230, amplification transmitter 240, It is configured to include a remote control unit 270 and the quality monitoring unit 260.

The array antenna receiver 220 receives a signal transmitted from the upper station 131-n-1 to 13N-n-1 transmitter 210 that fires at a long distance from the ground, and receives the signal through the array reception signal interference canceller 230. Transfer to amplification transmitter 240.

The arrangement between the elements of the array antenna is such that the signal is received in the same phase as the signal transmitted from the upper station 131-n-1 to 13 N-n-1 transmitter 210, and is arranged with the output signal of the amplifying transmitter 240. It is preferable to arrange them geometrically so that a constant reception time difference occurs between signals received at the antenna. In addition, it is more preferable to use distance and simple shielding between possible transmission and reception to block the path of feedback.

Transceiver correlation spacing of the terrestrial signal relay station is about 40db at a distance of 2 to 3 meters, about 10db depending on sectorization, and about 10db depending on the use of orthogonal polarization.

That is, when the mechanical total value is about 60 to 70db, the reception electric field is about -70dbm and the transmission output is about + 30dbm, and when the relay signal-to-noise ratio is 20db, it is preferable to add about 50db to the transmission / reception gap.

The array receiving signal interference canceller 230 analyzes and deletes a reception angle between the signal received from the array antenna receiver 220 and the signal received from the amplifying transmitter 240 under the control of the remote controller 270 to thereby output high power. It is desirable to enable signal amplification of.

The quality monitoring unit 260 monitors a signal amplified and transmitted by the amplifying transmitter 240 under the control of the remote controller 270 to measure a phenomenon in which the signal-to-noise ratio decreases, and transmits the result to the remote controller 270. do.

The remote controller 270 controls the operation and gain of each of the array antenna receiver 220, the array reception signal interference canceller 230, and the amplification transmitter 240 to maintain the best output and an appropriate signal-to-noise ratio.

The remote management station 280 executes periodic reporting and operator's instructions via a communication medium such as a wired or wireless telephone line.

Thus, when the receiving terminal 250 in a poor environment such as a building wants to receive satellite broadcasts, it is possible to receive a signal having a strength similar to that of a mobile phone received from a base station of an existing mobile phone. That is, the receiving terminal 250 may receive a much stronger signal than when receiving the signal directly from the satellite station 120, and the signal can be freely received while moving.

It will be apparent to those skilled in the art that the relay network including the wireless satellite broadcasting relay device according to the present invention can sufficiently apply similar application cases such as mutual interaction with a mobile telephone.

Wireless satellite broadcasting relay method according to the present invention is a wireless satellite relay method using the wireless satellite repeater, earth station signal transmission step, satellite station signal retransmission step, terrestrial signal conversion station signal transmission step and terrestrial signal relay station signal relay step Is done.

In the earth station signal transmission step, the earth station 110 transmits the signal toward the satellite station 120 at a specific frequency. In the satellite station signal retransmission step, the satellite station 120 receives and frequency-converts the signal transmitted by the earth station 110. Resend to a specific area.

In the terrestrial signal converting station signal transmitting step, the N ground signal converting stations receiving the retransmitted signals convert signals using a frequency different from that of the received signal, and are wirelessly connected in series to each ground signal converting station. It transmits to the 1st ground signal relay station among the N ground signal relay stations.

In the ground signal relay station, the signal relaying step transmits a signal received by the first ground signal relay station to a ground signal relay station which is cascaded to a first ground signal relay station. Cascade relay through As a result, satellite broadcasting signals can be effectively received by the reception terminal 250 in downtown and in buildings.

The wireless satellite broadcasting relay method of the present invention as described above may be stored in a computer-readable recording medium. Such recording media include all types of recording media on which programs and data are stored so that they can be read by a computer system. Examples include read only memory, random access memory, compact disk read only memory, magnetic tape, floppy disk, and optical data storage. Programs and data stored on such recording media can be distributed over network coupled computer systems so that the computer can be stored and executed in a readable manner in a distributed fashion.

The terms used to describe the embodiments of the present invention above are used for the purpose of describing the present invention, and are not used to limit the scope of the present invention as defined in the claims or the claims.

As described in detail above, according to the present invention, it is possible to economically construct a portable broadcast reception network using satellites by converting and relaying weak satellite signals into strong signals on the ground, and compact portable terminals in dense urban areas and buildings. It also has the effect of receiving satellite broadcast signals.

In particular, there is an effect that when the receiving terminal to be used, such as a vehicle installation type and personal portable is strong and the user can be provided with a subscription type satellite broadcasting service without having a satellite receiver.

Claims (8)

N ground signal conversion stations for receiving, amplifying and outputting satellite signals from the satellite stations; Cascade connected N ground signal relay stations for receiving a radio signal output from each terrestrial signal conversion station; In the wireless satellite relay device included in the ground signal relay station, An array antenna receiver for receiving a signal from an upper station and analyzing a reception angle of an interference signal; An array reception signal interference cancellation unit configured to detect and remove the analyzed interference signal from the received signal; An amplifying transmitter for amplifying the signal from which the interference is removed and transmitting the amplified signal to a receiving terminal; A quality monitoring unit for monitoring the quality of the transmission signal; And A remote control unit executing gain control and an operator command for each signal transmission path according to the measured transmission signal quality; Wireless satellite relay device configured to include. The method of claim 1, And a signal frequency received by the array antenna receiver and a signal frequency transmitted by the amplifying transmitter. The method of claim 1, The array receiving signal interference unit removes the feedback signal of the terrestrial signal relay station using at least one of spaced transmission and reception distance, use of directional aerial, use of orthogonal polarization, use of interference cancellation technology by array antenna, and use of shielding between transmission and reception. Satellite repeater. The method of claim 1, And an amplifying transmitter is wirelessly connected to the mobile telephone network in order to provide a two-way broadcasting service in association with an existing mobile telephone network. The method of claim 1, And the terrestrial signal conversion station uses a code division modulation (CMD) scheme for stable reception during movement of a receiving terminal with respect to terrestrial multipath reception. The method of claim 1, The terrestrial signal conversion station selects a better signal among the code division modulation signals received to the satellite station through a plurality of array antennas and a high-gain aerial, and installs a remote location and a predetermined shield so as to provide the first frequency at the same frequency and the same modulation scheme. A wireless satellite relay device, characterized by transmitting to a ground signal relay station. In the wireless satellite relay method using a wireless satellite relay according to any one of claims 1 to 6, (a) the earth station transmitting a signal at a particular frequency towards the satellite station; (b) the satellite station receiving the signal, frequency converting and retransmitting it to a specific area of the ground; (c) N ground signal converting stations receiving the retransmitted signals convert signals using frequencies different from the received signals, and N ground signals wirelessly cascaded to each of the ground signal converting stations. Transmitting to a first terrestrial signal relay station of the relay station; And (d) transmits the signal received by the first terrestrial signal relay station to a terrestrial signal relay station cascaded wirelessly to the first terrestrial signal relay station, and continuously through the N-1 terrestrial signal relay stations connected in series; Cascade) relaying; Wireless satellite relay method comprising a. A computer-readable recording medium containing a program capable of performing a wireless satellite relay method for implementing the method according to claim 7.