The modulation method and the structural diagram of the transmission of information signals

 

(57) Abstract:

The invention relates to modulation, transmission and reception of information signals. The modulation method for transmission of information signals in the long wavelength range is that information signals modulate the first carrier frequency by the method of quadrature two-way modulation, emit a signal with a single side-band and unrepressed carrier, carry out the transformation of this signal in the intermediate frequency signal with one or two side strips and convert the intermediate frequency signal in the long wavelength range by mixing with frequencies that radiate. Diagram of the transmission of information signals and a receiver of information signals are respectively for transmission and reception of the mentioned signals. Technical result achieved - increase efficiency and decrease the likelihood of signal interference. 3 S. and 1 C.p. f-crystals, 3 ill.

The invention relates to a method of modulation and structural diagram of the transmission of information signals and a receiver for receiving modulated and transmitted in this way information signals.

For example, are principally known for the two-module is toleromune subcarrier like a differential signal in a stereo transmission, like the radio information signal systems (Radio data System) for additional information on programs in VHF radio and a color signal in the transmission of color television. Thanks to international publication WO 85/05748 already gained fame modulation (PSK) by phase manipulation of the auxiliary carrier for AM-compatible radio.

This two-way modulation integrates specially in such channels of communication, in which the bandwidth of the signal plays a minor role.

Necessary for demodulation of modulated signal with two side bands of the carrier generate, for example, in the stereo transmission, by the simultaneous transmission of the reference frequency 19 kHz to obtain the carrier 38 kHz in FM signal (frequency modulation) multiplex signal. In order to regenerate the carrier signal with two identical side bars, other methods are used loop Costa (Costa's Loop). As an example, the chip SAA6579T demodulator radio information system (RDS).

In this case, signal transmission radio information system (quadrature two-way modulation with 2 identical side bars) (RDS QDSB) Diane lane modulation (RDS QDSB) with this band in the range of long and very long waves (9. . . 148,5 kHz) would lead to interference in adjacent channels already coordinated transmitters.

This circumstance causes the associated disadvantages of two-way transmission, such as:

1) the need for dual bandwidth of the radio signal (RF signal),

2) the distribution of radiated energy equally between the two side bands, even when the necessity exists only in one side,

3) double the bandwidth selectivity in the required receivers increases the likelihood of distortion of the signal interference.

In General terms the problems with analog or digital data transmission over the radio is the bandwidth required by the product of the modulation. This means that in the international and national levels should strive to make optimum use of natural resources, in particular to the use of bandwidth for links.

In order to narrow the bandwidth used is already known modulation method with a single side-band (SSB), for example, for digital signals, modulated by a quadrature amplitude modulation or phase shift keying (QAM or PSK) according to international publication WO 85/04541. Drove formed two side bands with the same information content, while for the regeneration of the content required only one sideband, which in this known method requires special circuitry decoding the received signals.

Therefore, the basis of the invention lies in the task of developing such a method and such a structural diagram of the transmission of information signals through the transmitter with a large radius primary service, which would allow to avoid the above disadvantages.

Way structural diagram of the receiver in accordance with the invention should allow you to implement this task quickly and with the least cost, without the development of new circuits (chips), and to provide the opportunity for them to use in terminal equipment.

This problem is solved by means of the characteristics disclosed in the paragraph 1 of the claims and related transmission in the radio information signal system on the one band, and features disclosed in paragraph 6 of the claims and related structural schema.

Other developmental invention the signs contained in the characterizing portion of paragraphs 2-5 of claims.

The advantage of the solution according to the invention consists in including in that analog is dolaze = 2 phase manipulation DSB = 2PSK). A common use case for two-way modulation (DSB), and to be more precise, the quadrature two-way modulation (QDSB) is the signal radio information system (RDS), as shown in Fig. 1.

So, for example, by filtering it is possible to allocate selectively lower or upper sideband signal radio information system (RDS). Thus obtained digital single-sideband modulation by mixing with the appropriate frequencies can be moved in the desired range of transmission, as shown in Fig. 2.

Transfer one sidebar on or without unrepressed carrier depends on the applied method of demodulation. Both variants are accepted (see Fig. 1), which implies that, compared with the quadrature two-way transfer (QDSB) will be occupied by only half the width of the strip.

In addition, improving the efficiency of the transmitter and, therefore, with the same radius primary service will reduce energy and operating costs. Narrowing lanes can reduce bandwidth selectivity (selectivity) at the receiving side, thereby reducing the likelihood of signal interference. Receiver with such advantages Reimer certain embodiments, presented on the drawings.

Fig. 1 depicts the transmission of a modulated radio information in the signal system with one sideband;

Fig. 2 is a schematic diagram of the method corresponding to the invention, and

Fig. 3 is a schematic diagram of the receiver.

In the description and in the drawings used the following abbreviations:

ARI - Information on Autoradio

RDS radio information system (Radio data System)

The SSB Modulation with a single side-band (single side band)

DSB Modulation with two side bars (double side band)

QDSB - Quadrature two-way modulation

USB - Upper sideband (upper side band)

LSB - lower sideband (lower side band)

PSK - Phase shift keying (phase shift keying)

ZF - intermediate frequency (abbreviated FC).

The above disadvantages occurring when the radiation signal radio information system on long wave, can be overcome by transferring the modulation methods with a single side-band (SSB), known by analog technology transfer, to a quadrature two-way modulation for radio information system (RDS). Unlike analog single-sideband modulation (SSB) demodulation need to have the bearing in the correct fusa, depicted as a dashed line, o = 57 kHz characterizes the known system Autoradio unmodulated carrier frequency Autoradio (ARI). She is in quadrature relative to the phase of the signal radio information system (RDS) and, therefore, can be used for demodulation sideband signal radio information system, the modulated quadrature two-way modulation (RDS QDSB).

The formation of the RDS signal QDSB for a range of long waves shown in Fig. 2. As a rule, as a provider of radio information signal system, the modulated quadrature two-way modulation (RDS QDSB), (unmodulated) carrier Autoradio (ARI), you can use any encoder, known for VHF-radio system.

In this case, for forming the upper sideband (USB), taken in the frame of the dashed line, on a bearing, the method of filtration. This means that as the second step converts the frequency signal, modulated by a quadrature two-way modulation RDS QDSB (kg), wide bandwidth ( = to 2.4 kHz SSB filter.

Thus, depending on the selected lo frequency in the first frequency or the upper sideband (upper sideband + carrier frequency) on the position of the intermediate frequency. The second frequency transformation is used to transfer the received single sideband radio (RDS) with unrepressed carrier (carrier suppressed to the maximum amplitude of the side band) for the desired transmission frequency. At subsequent stages of amplification of the signal corresponding to the radiated power. How will be generated signal with a single side-band (method of filtering phase method or by synthetic generation), is insignificant. Not excluded the possibility of applying this method to more complex types of modulation, for example, via a two-way principle. The application of this method is, regardless of the range of long waves.

Below is a description of demodulation in the transmission radio signal with a single side-band SSB-RSD.

In principle, it is possible as a synchronous demodulation (coherent demodulator with an auxiliary carrier with the correct frequency and phase) and asynchronous demodulation (without auxiliary carrier). When using synchronous type demodulation is necessary on the side of the transmission to add unrepressed carrier, which is in quadrature relative to the sidebar. Demodulation occurs through synchrony demodulation takes place directly in the baseband. In asynchronous demodulation is necessary, so that at the receiving side, the demodulator has provided the missing orientation of the carrier relative to the sidebar. Further, the demodulation signal by analyzing the typical components of the frequency spectrum at the numbers 0 or 1 and the generation of these data flow, which will be asynchronous demodulation sidebar, including demodulation by analyzing the components of the frequency spectrum of the product of the modulation. This means that for demodulation does not require the development of new chips, chips, because in any case the product demodulation can be immediately launched in the further processing using standard digital circuits.

Radio transmission with a single side-band (SSB-RDS) was tested in the range of long waves at a frequency of 123,7 kHz, while technically feasible and justified showed himself described below with reference to Fig.2 scheme. In this case, the source of information is 1, the encoder 2 radio information system (RDS), which can provide a quadrature two-way modulation with or without a carrier. After the first frequency conversion in the first mixer 3 and the first local oscillator 4, a signal is generated with a single side-band and direct what urodynam 7 is fed carrier frequency, converted to a transmission frequency, is amplified in the amplifier 8 and transmitted.

Thus, as unrepressed carrier can be used carrier signal Autoradio included in the encoder radio information system (RDS). To receive radiosignal with one side band is known for multi-band receiver with a synchronous demodulator. Further processing of the base band radio information system (RDS) (bi-phase signal) does not create any technical problems. The application process does not depend on the range of long waves.

In Fig. 3 shows a receiver for receiving information signals transmitted from the application of the method according to the invention. From the antenna 13 of the high-frequency signals are fed to an input amplifier 14. Frequency fe + FZF(FC)generated by the local oscillator 15, and fe represents a carrier unrepressed carrier contained in the high frequency signal, and FZF(FC)= 57 kHz. Then at the stage of mixing 16 amplified high-frequency signal is transferred to an intermediate frequency and passed through band-pass filter 17 with a bandwidth of 2.4 kHz. Connected standard demodulator radio information system (RDS) 18 type SAA6579T that omeopatia set in the radio information system, and then supplied to the display.

1. The modulation method for transmission of information signals in the long wavelength range, namely, that information signals modulate the first carrier frequency by the method of quadrature two-way modulation, isolated from the modulated signal by filtering or phase method the signal from a single side-band and unrepressed carrier, carry out the conversion of single-sideband signal with unrepressed carrier in the intermediate frequency signal with one or two side strips and convert the intermediate frequency signal in the long wavelength range by mixing with frequencies that radiate.

2. The method according to p. 1, characterized in that the signal from a single side-band and unrepressed carrier contains the lower or upper sideband.

3. Diagram of the transmission of information signals containing the encoder radio information system that generates a signal with a single side-band and unrepressed carrier connected to the frequency Converter 3, 4, the output of which through the band-pass filter connected to the frequency Converter in the long wavelength range, the output of which is connected to the input of the longwave transmitter.the long-wavelength signal into a signal of intermediate frequency and converting the latter in single-sideband modulated signal with unrepressed carrier 14, 15, 16, which outputs through a band-pass filter connected to the demodulator that generates an information signal, while the bandwidth of the band pass filter is 2.4 kHz.

Priority points:

28.06.1995 on PP. 1, 2, 4;

14.02.1996 on p. 3.2

 

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