HU200867B - Radio transmitter-receiver in first of all for establishing a connection of scattered spectrum - Google Patents

Abstract

The present invention relates to a radio transceiver apparatus, a first phase modulator, an apparatus for establishing a data transmission (1) and a BPSK modulator (3), which has a transmitter side (A) and a receiver side (3). V) a common data input filter (2) is arranged through a common transmitter diplexer (11), which is a baseband low pass filter. Connected with the transmitter-socket (13). The medium-frequency filter (A) of the transmitter (A) (5.8) is a small scale (A) BPSK modulator (3), a locomotor (71) of a pulp mill, a transmitter mixer (6) connected thereto, and a BPSK. with a modulator (3), there is a central frequency filter (s) (5,8) coupled to a local generator generating a high-level signal, transmitting. The level controller (9) and the transmitter power mixer (6), the level controller (9), and the transceiver (10) transmitter-amplifier (10) connected to a high-linearity diplexer (11) are formed of circuit elements. Includes Transceiver. The transmitter-mixer transmitter local generator between the diplexer (11) and the antenna connector (13) (71), the first receiver mixer (16) of the receiver side (V) is fitted with a level and reflection meter (12), which has the input (22) provided. The apparatus is also connected to an AGC input (22) (Fig. 1), so that the multiplier type of the BPSK modulator (3) is described. Scope of the description: page 5, Fig. 3 Fig. 1 EN 200 867 B -1-

Description

(54) RADIO TRANSMITTER EQUIPMENT PRINCIPALLY BROADCAST SPECTRUM CONNECTION (57) EXTRACT '

The present invention relates to a radio transceiver device, which is configured as a first phase modulator, in particular to provide a spread spectrum connection between an input (1) and a BPSK modulator (3) having a transmitting side (A) and a receiving side (A). V) and a common data input filter (2) is provided via a common transceiver diplexer (11) formed as a baseband low pass filter. It is connected to the transmitter connection (13). The mid-pass filter (5,8) of the transmitting side (A) has a small degree (A) BPSK modulator (3), a radio frequency transducer (71) connected thereto, a carrier oscillator (4), a BPSK modulator (4). 3) is a center-frequency filter (s) (5,8) switched on as a serial generator for generating a high level signal, transmitting. The level regulator (9) and the transmitter-power mixer (6), the level controller (9) and the transceiver (10) are constructed of high linearity transceiver amplifiers (10) connected to a known diplexer (11). The transceiver contains. Between the diplexer (11) and the antenna connector (71), the transducer local generator generator is provided with a level and reflection meter (12) of the first receiver-mixer (16) of the receiving side (V), which is connected to the input (22). provided. The apparatus is also connected to an AGC input (22) (FIG. 1), such that the BPSK modulator (3) is a multiplier type.

HU 200 867 B

Description: 5 pages, figure 3 Figure 1

-1HU 200867 Β

The present invention relates to a radio transceiver apparatus, in particular for establishing a spread spectrum connection, which provides a tunable radio transmission with high interference protection and good coverage.

In international practice, fixed-channel radio relay systems with non-tunable fixed channel distribution are used for transmitting high-speed digital signals. Various modulation techniques are known to facilitate transmission, of which phase modulation is the most common, low-color, two-phase (BPSK) and four-phase (QPSK) modulator is the direct microwave reflection phase modulator. An example of such a system is the ALCATEL DM 3002. In these known solutions, the modulators are switch-mode, i.e. non-linear, and consequently the components of their spectrum in adjacent channels have significant power. Due to this known training of modulators, equipment containing such modulators requires a steeply cut, specially designed filter in each RF channel, which has already significantly attenuated the spectrum components of adjacent RF channels. It is not possible to tune these filters during operation, so changing the channel using multiple filters is a so-called. smart bank and radio frequency switches. Examples of such solutions are the domestic ORION KTT-70, FMV GGT-70 or the foreign NORTHERN TELECON RD-4A.

Over the last decade, radio equipment operating on the principle of spectrum extension has played an important role in various civil and non-civil communication systems. These radio equipment can be considered as special digital systems which transmit information in a radio frequency band which is significantly larger than what is required by the modulation applied. Ultimately, spread spectrum systems are considered to be low-speed digital systems for baseband information and high-speed digital systems for radio-frequency systems. Known spread spectrum solutions are deployed.

It is an object of the present invention to provide a solution with high interference protection and good coverage. It is a further object of the present invention to provide a radio transceiver having a common antenna, which is capable of providing multiple RF channels, providing rapid tuning, and which is easy and quick to install.

We have discovered that the requirements for low-capacity, i.e. low-speed, mobile digital systems - quick tuning, easy and quick deployment - are best met by equipment capable of transmitting broadband, high-speed digital signals. In our experiments we have realized that it is advisable to use two-phase (BPSK) modulation among the known modulation methods, which provides the highest protection

L · modulation methods for interference interference. An advantage of this modulation is that, according to our experiments, a significant bandwidth limitation on the data signal does not result in the loss of useful information, while a significant bandwidth limitation can achieve significant RF bandwidth savings.

Our experiments have also shown that the use of known microwave switching - i.e. non-linear - known modulators is inappropriate due to the non-tunable special filters they require and the fact that devices using such modulators require radio frequency switches, which they are very complex. It has now been discovered that providing linearity with a modulator type modulator that produces modulation can save complex filter circuits that have special properties following the modulator, which significantly attenuate spectrum components in adjacent radio frequency channels. The use of a linear BPSK modulator of the multiplier type also has the advantage that baseband filtering can be performed before the modulator, not with a specially designed filter, but with a simple low-pass filter.

Furthermore, the use of a linear phase modulator of the multiplier type has the advantage that the further bandwidth limitation of the modulated mid-frequency signal which it modulates also does not require special filters, it can be implemented with a simple, medium-frequency low-pass filter.

It has also been found that by using after the center frequency filter, circuits of sufficient linearity, which no longer substantially modify the spectrum image of the band-limited modulated center frequency signal, the transmitting side of the apparatus can be simply constructed to provide a spread spectrum connection. .

In particular, in the implementation of a spread spectrum apparatus, it has also been found that the known transmitter-mixer local generator and the receiver-mixer local generator may conveniently be designed as a common transmitter-receiver local generator.

The receiver side of the radio transceiver apparatus of the present invention is a conventional arrangement known in the art. However, it is a further realization of the present invention that it is advantageous to use a level and reflection meter to determine the level of transmission and reception signals and to provide measurement of reflection on the antenna cable. With this advantageous level and reflection meter, proper error filtering can be performed, for example, to detect antenna breakage.

BACKGROUND OF THE INVENTION The present invention relates to a radio transceiver apparatus, in particular for establishing a spread spectrum connection, the transmitting side and the receiving side of which are connected to a common antenna via a common transceiver diplexer. The transmitter includes a BPSK modulator, a carrier oscillator attached thereto, a center frequency filter connected in series with the BPSK modulator, a transmitter mixer, a level regulator, and a transmitter amplifier connected to the transceiver diplexer. The local generator of the tax mixer, the buyer side

-2EN 200867 Β The receiver mixer has a receiver local generator. The receiver side is further provided with an AGC input. The radio transceiver is configured such that the BPSK modulator is configured as a multiplier-type phase modulator, and a data input filter constructed as a baseband low pass filter is provided between the data input of the apparatus and the BPSK modulator. The mid-pass filter on the transmitter side is a low-pass bandpass filter, and the on-chip generator of the transmitter is designed as a high-frequency signal generator. The level regulator and the transmitter-terminal amplifier are made of linearly known circuit elements providing linearity. A level and reflection meter is connected between the transceiver diplexer and the antenna connector, which is also connected to the AGC input.

In a preferred embodiment of the radio transceiver apparatus of the present invention, the transceiver local generator and the receiver side first receiver mixer local generator are configured as a common transceiver local generator.

In a preferred embodiment of the invention, the level and reflection meter includes a dual directional coupler connected to the transceiver diplexer and an output to the antenna connector. The dual directional coupler is connected to a traveling wave detector and a reflected wave detector, the outputs of which are connected to a quotient input. The quotient output and the output of the waveguide detector are coupled to a reflection evaluation comparator circuit. The level and reflection meter has a multiplexer, a multi-wave detector output and a receiver-side AGC input connected to the multiplexer input. The output of the multiplexer is connected to an encoder via an A / D converter, and the encoder output is connected to a transmit level indicator and a reception level indicator.

A possible exemplary embodiment of the radio transceiver apparatus of the present invention will be described in detail with reference to the accompanying drawings, in which:

Figure 1 is a block diagram of a transceiver,

Figure 2 shows the internal structure of a transmitter-side and a receiver-side locally preferably transceiver,

Figure 3 is a block diagram of a level and reflection meter.

Figure 1 shows that the radio transceiver has a transmitting side A and a receiving side V, and the transmitting side A and the receiving side V are connected to a common antenna connector 13 via a common transceiver diplexer 11. According to the present invention, a level and reflection meter 12 is inserted between the transceiver diplexer 11 and the antenna connector 13.

Connected to the data input 1 of the apparatus is a data input filter 2, formed as a baseband low pass filter, the output of which is connected to the input of a BPSK modulator 3. A carrier oscillator 4 is coupled to the BPSK modulator 3 in a manner known per se. According to the figure, a first center frequency filter 5, a transmitter mixer 6, a second center frequency filter 8, a level regulator 9 and a transmitter-final amplifier 10 are connected in series with the BPSK modulator 3. The transmitter mixer 6, in a known manner, has a transmitter local generator 71.

The radio transceiver apparatus of the present invention

The buyer side of V is known in itself. The receiver side V includes a preamplifier 14 connected to the common transceiver diplexer 11, a mirror filter 15 connected thereto, a first receiver mixer 16, a first mid frequency band amplifier, a second receiver mixer 18, a second center frequency 20 amplifier. The first receiver mixer 16 has a local generator 72 and the second receiver mixer 19 has a local generator. THE

The output of the receiver side is the output 21 of the second mid frequency band amplifier 20. The receiver side V is, in a manner known per se, provided with an AGC input 22 connected to the second mid frequency band amplifier 20 and to the level and reflection meter 12.

It is preferred that the local generator 71 of the transmitter side 6 of the transceiver A and the local generator 72 of the first receiver 16 of the receiver side V be configured as a common transceiver locator 7. An exemplary structure of the common transceiver local generator 7 is illustrated in Figure 2.

A preferred embodiment of the local generator 7 comprises a disconnected amplifier 701, a coupler 702, a power amplifier 706, a further coupler 707 and an output divider 709 connected in series with a VCO 700 generator. One output of the divider 709 is connected to the transmitter mixer 6 on the transmitter side A and the other output to the first receiver mixer 16 on the receiver side V. The common transceiver local generator 7 has a synthesizer 704 and a control unit 705 which controls it. The output of the synthesizer 704 is connected to the 700 VCO generator. Further output of interface 702 is coupled to frequency synthesizer input 704 via frequency divider 703. An additional output of the additional interface 707 is connected to a level detector 708.

Figure 3 shows a preferred structure of the level and reflection meter 12. The transducer has an input of the level and reflection meter 12 and a dual directional coupler 120 connected to the diplexer 11 and its output to the antenna connector 13. Connected to the dual directional coupler 120 are the forward-wave detector 121 and the reflected-wave detector 122, whose outputs are connected to the quotient inputs 123. The quotient output 123 and the output of the detector 121 are coupled to a reflection evaluation comparator 124. The level and reflection meter 12 has a multiplexer 125, a multiplexer input 125 having a waveguide detector output 121 and a receiver side V AGC 22. The output of the multiplexer 125 is connected to an encoder 127 via a 126 A / D converter. The outputs of encoder 127 are coupled to transmit level display 128 and reception level display 129.

The radio transceiver apparatus of the present invention operates in detail as follows.

The solution uses BPSK modulation on transmitter side A, even though the BPSK modulator 3 is configured as a multiplier type phase modulator. This has the great advantage that, by its design, the BPSK modulator 3 functions as a linear element, thereby avoiding interference in adjacent channels with known non-linear switching modulators. A further advantage is the

-3EN 200867 Β multiplier type 3 BPSK modulator that the data signal appearing on the data input 1 can be filtered very simply. Namely, even the bandwidth limitation of the data signal by the data input filter 2, which is a significant baseband low pass filter, does not cause the loss of useful information, but this bandwidth limitation achieves significant RF bandwidth savings. Due to the linearity requirements for the multiplier type BPSK modulator 3, the BPSK modulator 3 operates at a high level and the KF 4 carrier oscillator provides the high level signal to be modulated in a manner known per se. In addition to the high linearity requirements, the BPSK modulator 3 provides undesired spectral components which are suppressed by a filter 5 designed as a mid frequency low pass band filter. The filter 5 is also followed by a high level transmitter mixer 6, the local signal of which is preferably provided by a common transceiver local generator 7. The use of the common transceiver local generator 7 is desirable whenever there is no separate demand for separate separation of the transmitting side A and the receiving side V. After the transmitter mixer 6, a second mid-frequency filter 8 is preferably provided on the transmitter side A. This filter 8 suppresses an unwanted sidebar and a leaking local signal in a manner known per se. With the level regulator 9, which is, for example, a controlled PIN diode attenuator, the level of the radio transmitter can be varied in a known manner, for example according to the distance to be bridged and / or the degree of interference. The level regulator 9 is followed by a transceiver amplifier 10 which contains a known linear power amplifier.

The transmit signal of transmitter side A passes through the transmitter-receiver diplexer 11 to the dual directional coupler 120 which is part of the level and reflection meter 12. The filters of the diplexer 11 ensure, in a conventional manner, that the radiated signal and the broadband noise of the transmitting side A, and signals outside the receiving side of the receiving side V, can only reach the receiving side V with great attenuation.

The structure of the receiver side V is known per se and will not be discussed in detail in connection with the present invention. The receiver side V is configured such that the linear operating range of the receiver side V circuits is advantageously extended, in particular to take advantage of the processing gain characteristic of the scattered systems. The advantage of this solution is that there is no need for filtering per channel and, on the other hand, it results in such a large dynamic range that no disturbances well above the reception level will saturate the receiver side.

The level and reflection meter 12 of the present invention by reflection measurement - output of high reflection comparator 124 output, medium reflection 124 output comparator 124, low reflection comparator 124 output £ - of possible failure of the relatively long antenna connector 13 and level measurement 128 , 129 reception level display — provides useful information about the status of the connection. The level and reflection meter 12 divides the reflection warning signal from the dual-wave detector 121 and the reflected wave detector 122 into the dual directional coupler 120, the transmission level signal from the forward-wave detector 121, and the reception level input signal "AG". is formed from the voltage.

The radio transceiver apparatus of the present invention achieves the intended technical objective in an economically optimal manner. Uniformed circuit elements may be used in the construction of the equipment, and the system design allows the use of a common transceiver local generator 7 whenever there is no separate demand for separation of the transmitting side A and the receiving side V. The 12 level and reflection meters used provide easy, fast error detection, which reduces operating costs. Our solution does not require the use of a large number of bulky, complex radio frequency filters used in the known solutions, and the low-frequency baseband and mid-frequency filters - 2 filters, 5 filters, 8 filters - that are significantly simpler.

PATENT CLAIMS

Claims (3)

1. A radio transceiver apparatus, in particular for establishing a spread spectrum connection having a transmitting side and a receiving side connected via a common transceiver diplexer to a common antenna connector, a transmitting side BPSK modulator, a carrier oscillator connected thereto, a center frequency connected in series with the BPSK modulator. (s), a transmitter mixer, a level controller, and a transmitter end amplifier coupled to the transceiver diplexer, having a transmitter local generator, and a first receiver mixer of the receiver side having a receiver local generator, and the receiver side having an AGC input that the BPSK modulator (3) is configured as a multiplier-type phase modulator, and a data input filter (2) formed as a baseband low pass filter between the device data input (1) and the BPSK modulator (3), the mid frequency filter of the transmitting side (A) (5, 8) low degree bandpass filter, transmitter mix the power generator (71) is configured as a high-level local generator, and the level regulator (9) and transmitter-amplifier (10) are of high linearity, again composed of circuit elements, the transceiver diplexer (11) and the antenna connector A level and reflection meter (12) is connected between (13) and connected to the AGC input (22). Apparatus according to claim 1, characterized in that the local generator (71) of the transmitter mixer (6) and the local generator (72) of the first receiver mixer (16) of the receiver side (V) is a common transmitter receiver generator (7). ) comprising a VCO generator (700) in series separating amplifier (701), a coupler (702), a power amplifier (706), and a coupler (707) and an output divider (709), one of the outputs of the output divider (709) being the transmitter - side (A) is connected to the transmitter mixer (6) and its other output is connected to the first receiver-mixer (16) of the receiver side (V), the local generator (7) has a synthesizer (704) and a control unit (705) controlling it; the output of the synthesizer (704) is connected to the VCO generator (700), the other output of the interface (702) is via the frequency divider (703) to the synthesizer -4EN 200867 Β (704) is connected to it and the other output of the other interface (707) is connected to a level detector (708). Apparatus according to claim 1 or 2, characterized in that the level and reflection meter (12) has a dual directional coupler (120) connected to the transceiver diplexer (11) and an output to the antenna connector (13). , connected to the dual directional coupler (120), a waveguide detector (121) and a reflected wave detector (122) 10, whose outputs are connected to the inputs of the quotient generator (123), the output of the quadrature generator (123) and the outgoing waveguide detector connected to a reflection evaluator comparator circuit (124), the level and reflection meter (12) having a multiplexer (125), an output of the advanced wave detector (121) for the input of the multiplexer (125), and an AGC input (V) of the receiver side (V). 22) is connected, the output of the multiplexer (125) is connected to an encoder (127) via an A / D converter (126), and the outputs of the encoder (127) are connected to a transmit level indicator (128) and are connected to an indicator (129). -5HU 200867 Β Int Cl ⁵ : H 04 B14 / 00, H 04 B 7/00 cn -6. HU 200867 Β Int Cr: Η 04 Β 14/00, Η 04 Β 7/00 - ---- - » π) Sb — Ω -ο) CN -7HU 200867 Β Int Cl ⁵ : H 04 B 14/00, H 04 B 7/00