KR20060105103A - Adaptation type wireless relay system - Google Patents

Abstract

The present invention integrates redundant components in the forward / reverse link of a time division duplex (TDD) type wireless repeater system to simplify transmission / reception structure and to improve transmission / reception separation in the forward / reverse direction. An adaptive wireless repeater system is provided. To this end, the present invention provides a forward link and a reverse link according to forward and reverse signal transmission and reception means for performing reception and transmission of forward and reverse radio signals, and whether forward or reverse signal reception is detected in the forward and reverse signal transmission and reception means. Switching means for switching to form the signal transmission and reception path of the link, and bidirectional signal processing integrated to enable common signal processing of the forward and reverse signals according to the signal transmission and reception path formation of the forward link or reverse link of the switching means It is characterized by consisting of means.

Time Division Duplex (TDD), Radio Relay, Integrated, Common, RF Switch

Description

Adaptive Wireless Repeater System {ADAPTATION TYPE WIRELESS RELAY SYSTEM}

1 is a view showing the configuration of a typical time division duplex (TDD) wireless repeater system,

2 is a diagram showing the configuration of an adaptive wireless repeater system according to an embodiment of the present invention;

3 is a diagram showing the configuration of an adaptive wireless repeater system according to another embodiment of the present invention.

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

50, 80: antenna, 52, 64, 78, 108: filter,

54,78: circulator, 56, 60, 68, 72, 82, 88, 94, 108: RF switch,

58, 84: low noise amplifier, 62, 66, 70, 86, 98, 102: amplifier,

92: synchronous detector, 96, 104: mixer,

100: surface elastic filter, 106: local oscillator.

The present invention relates to a time-division duplex (TDD) wireless repeater system, and more particularly, to adaptively solve the problem of forward / backward transmit / receive isolation by simply improving the transmission / reception structure of the forward / reverse signal. A wireless repeater system.

As is well known, a time division duplex (TDD) system uses a radio transmission / reception frequency together when a base station and a terminal transmit and receive a signal. In this time division duplex method, a transmission / reception signal is divided by a time distribution on the same frequency. have. Therefore, in the time-division duplex wireless repeater system that relays such a wireless signal, the RF switch is controlled by detecting the synchronization with the transmitted / received signal so that the transmitted / received signal is a relay function such as amplifying the signal and removing out-of-band signal through independent paths. To be able to do this.

That is, FIG. 1 is a diagram illustrating a configuration of a general time division duplex (TDD) wireless repeater system, wherein the time division duplex wireless repeater system includes first and second antennas 2 and 26 and filters 4 and 14. 24, 34, circulator 6, RF switches 8, 18, 28, 38, low noise amplifiers 10, 30, amplifiers 12, 16, 32, 36, power amplifiers 20, 40, the synchronization detector 42 is configured.

In the forward link of the time division duplex wireless repeater system, when the signal received from the first antenna 2 is detected by the sync detector 42, the RF switches 8 and 18 on the forward link are switched on. At the same time, the RF switches 28 and 38 in the reverse link are switched off, so that the radio signals from the filter 4 and the circulator 6 are reduced to the low noise amplifier 10, the amplifier 12, and the filter. (14) Amplify and transmit radio waves through the second antenna (26) via the amplifier (16) and the power amplifier (20).

On the other hand, in the reverse link, instead of switching off the RF switches 8 and 18 on the forward link, the radio signal received from the second antenna 26 is switched on by switching on the RF switches 28 and 38 on the reverse link. Through the 24 and the circulator 22, the first antenna 2 is transmitted through the low noise amplifier 30, the amplifier 32, the filter 34, the amplifier 36, and the power amplifier 40.

However, in the conventional time division duplex wireless repeater system, the component price, such as a filter and an amplifier, required for a transmission and reception structure for bidirectional transmission and reception of a radio signal, is used by the same component in the forward link and the reverse link, respectively. In addition to the increase in the number of parts, there is a problem that there is a possibility of occurrence of Mean Time Between Failure (MTBF) which is proportional to the number of parts, and a large gain between each link in the forward link and the reverse link reduces the separation between the paths. Since the separation is not sufficiently secured, the oscillation of the system is caused by a feedback loop, and thus the transmission and reception separation is limited.

Accordingly, the present invention has been made to solve the above-mentioned conventional problem, and an object thereof is to simplify the structure of the system by sharing the elements which were overlapped in the forward / reverse path through the proper arrangement of the RF switch, and to simplify the structure of the forward / The present invention provides an adaptive wireless repeater system for improving transmission / reception separation in the reverse link to eliminate oscillation due to a feedback loop.

According to the present invention for achieving the above object, the forward and reverse signal transmitting and receiving means for performing the reception and transmission of the forward and reverse radio signals, and the reception detection of the forward or reverse signal in the forward and reverse signal transmission and reception means Switching means for performing switching for forming the signal transmission and reception path of the forward link or reverse link, and common signal processing of the forward signal and the reverse signal according to the signal transmission and reception path formation of the forward link or reverse link of the switching means It provides an adaptive wireless repeater system, characterized in that the bidirectional signal processing means integrated to enable.

Hereinafter, an embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, Figure 2 is a diagram showing the configuration of an adaptive wireless repeater system according to an embodiment of the present invention.

As shown in FIG. 2, the adaptive wireless repeater system according to an embodiment of the present invention includes the first and second antennas 50 and 80, the filters 52, 64 and 78, and the circulator 54,. 76, RF switches 56, 60, 68, 72, 82, 90, Low Noise Amplifiers (LNAs) 58, 84, Amplifiers 62, 66, 70, 86, High Power Amplifiers Amplifier (HPA) 74,90, and sync detector 92.

In an embodiment of the present invention, the filters 62 and 66 and the filter 64 are integrated with the forward link by integrating the filters and the components of the amplifier which are conventionally disposed between each RF switch in the forward link and the reverse link. It is arranged to be common to the reverse link.

Here, in order to enable the integrated amplifiers 62 and 66 and the filter 64 to be commonly used in the forward link and the reverse link, three stages between the respective amplifiers 62 and 66 and the filter 64 may be used. The RF switches 60 and 68 are arranged, and the three stages of the RF switches 60 and 68 are connected to the forward link or the reverse link by switching signals according to the distinction between the forward signal and the reverse signal of the synchronization detector 92. Perform switching to establish a connection state.

On the other hand, when the radio signal from the first antenna 50 is received and generates a switching signal as the synchronization detector 92 detects the reception of the forward signal, the RF switches 56 and 72 are switched on, As the three stages of the RF switches 60 and 68 are switched to the forward link side, the radio signal received from the first antenna 50 passes through the filter 52 and the circulator 54 to the RF switch 56->. Low Noise Amplifier (58)-> RF Switch (60)-> Amplifier (62)-> Filter (64)-> Amplifier (66)-> RF Switch (68)-> Amplifier (70)-> RF Switch (72) -> Power amplifier 74-> circulator 76-> through the filter 78 is transmitted wirelessly through the second antenna (80).

On the other hand, upon receiving the reverse signal from the second antenna 80, the RF switches 82 and 90 are switched on and the three stages of the RF switches 60 and 68 are switched to the reverse link side. The radio signal from the second antenna 80 passes through the filter 78 and the circulator 76 to the RF switch 82-> low noise amplifier 84-> RF switch 60-> amplifier 62-> Filter (64)-> Amplifier (66)-> RF Switch (68)-> Amplifier (86)-> RF Switch (88)-> Power Amplifier (90)-> Circulator (54)-> Filter (52) Through the first antenna 50 is wirelessly transmitted.

Thus, the amplifiers 62 and 66 and the filter 64 are integrally configured for the forward / reverse link, so that the three-stage RF switches 60 and 68 are selectively switched to the forward link or reverse link side. Accordingly, signal processing for signal amplification and filtering of a forward signal or a reverse signal in common can be performed.

Next, another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram showing the configuration of an adaptive wireless repeater system according to another embodiment of the present invention.

As shown in FIG. 3, the adaptive wireless repeater system according to another embodiment of the present invention includes the first and second antennas 50, 80, the filters 52, 78, 108, and the circulators 54, 76. RF Switches 56, 72, 82, 90, 94, 110, Low Noise Amplifiers (LNA) 58, 84, Amplifiers 70, 86, 98, 102, High Power Amplifiers (HPA) 74 90, a sync detector 92, mixers 96 and 104, a surface filter 100, and a local oscillator 106, respectively.

In another embodiment of the present invention, unlike one embodiment, to significantly improve the band selectivity of the repeater system, and to minimize the noise signal of the adjacent band introduced to the repeater and to minimize unnecessary radiation signal to the adjacent band, each amplifier A surface elastic filter 100 for bandpass filtering of wireless signals between 98,102 and localized by a local oscillator 106 between each three stage RF switch 94,110 and each of the amplifiers 98,102. As the mixers 96 and 104 are arranged to receive the oscillation signal and mix the signals, the filter 108 may be disposed between the mixer 104 and the RF switch 110. The state in which the 94 and 110 are switched to the forward link or the reverse link can be used as a common signal processing path of the forward signal and the reverse signal.

On the other hand, when the radio signal from the first antenna 50 is received and generates a switching signal as the synchronization detector 92 detects the reception of the forward signal, the RF switches 56 and 72 are switched on, As the three-stage RF switches 94 and 110 are switched to the forward link side, the radio signal received from the first antenna 50 passes through the filter 52 and the circulator 54 to the RF switch 56-> low noise amplifier. (58)-> RF Switch (94)-> Mixer (96)-> Amplifier (62)-> Surface Elastic Filter (100)-> Amplifier (102)-> Mixer (104)-> Filter (108)-> Radio transmission via the second antenna 80 through the RF switch 110-> amplifier 70-> RF switch 72-> power amplifier 74-> circulator 76-> filter 78 do.

On the other hand, upon receiving the reverse signal from the second antenna 80, the RF switches 82 and 90 are switched on, and the third stage RF switches 94 and 110 are switched to the reverse link side. Radio signals from antenna 80 pass through filter 78 and circulator 76 to RF switch 82-> low noise amplifier 84-> RF switch 94-> mixer 96-> amplifier ( 98)-> Surface Elastic Filter (100)-> Amplifier (102)-> Mixer (104)-> Filter (108)-> RF Switch (110)-> Amplifier (86)-> RF Switch (88)-> It is wirelessly transmitted through the first antenna 50 through the power amplifier 90-> circulator 54-> filter 52.

As described above, while the amplifiers 98 and 102 and the filter 108 are integrally configured for the forward / reverse link, the saw filter 100 and the mixer 96 and 108 are arranged in an integrated transmission and reception structure, According to a state in which the RF switches 94 and 110 are selectively switched to the forward link or reverse link side, a process of amplifying the forward signal or the reverse signal in common, signal synthesis, and filtering may be performed.

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, according to the present invention, a time division duplex wireless repeater system integrates redundant components such as an amplifier and a filter in a forward / reverse link, and transmits or receives an integrated forward or reverse signal according to a selective switching operation of an RF switch. By using a common structure to perform signal processing, it is possible to simplify the structure of the wireless repeater system, to reduce the manufacturing cost and to realize a low-cost product, and to improve the transmission and reception separation of the wireless signal. Not only that, but it can also improve the Mean Time Between Failure (MTBF).

Claims (3)

Forward and reverse signal transmission and reception means for receiving and transmitting forward and reverse radio signals; Switching means for performing switching for forming a signal transmission / reception path of a forward link or a reverse link according to whether a forward or reverse signal is detected by the forward and reverse signal transmission and reception means; And a bidirectional signal processing means integrated to enable common signal processing of the forward signal and the reverse signal according to the signal transmission / reception path formation of the forward link or the reverse link of the switching means. The method of claim 1, The bidirectional signal processing means includes: an amplifier integrally configured to amplify the forward signal and the reverse signal in common; An integrated filter configured to commonly filter forward and reverse signals; And a three-stage RF switch configured to selectively switch the configuration of the amplifier and the filter to the forward link or reverse link side. The method of claim 1, The bidirectional signal processing means includes: a mixer for synthesizing a forward signal and a reverse signal with a local oscillation frequency; An integrated amplifier configured to amplify the forward and reverse signals in common; A saw filter for bandpass filtering the forward and reverse signals, An integrated filter configured to commonly filter forward and reverse signals; And a three-stage RF switch configured to selectively switch the configuration of the amplifier and the filter to the forward link or reverse link side.

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