SU1494226A1 - Signal tranceiver - Google Patents

Abstract

The invention relates to radio engineering and communications. The purpose of the invention is to improve the reception accuracy by expanding the dynamic range of the transmitted signals. The device on the transmitting side contains a source of 1 signals, a selection block 2 of the signal envelope, controlled attenuators (AU) 3 and 4, a delay unit 5, a predistortion filter 6 and an adder 7, and on a receiving side A / A 8 and 9, a selection block 10 of the envelope signal delay unit 11, the correction filter 12, the adder 13 and the receiver 14 signals. In the device, the transmitted signals are predistorted and the received signals are adjusted only at a relatively low level. In this case, filters 6 and 12 provide increased noise immunity of the device for these signals. The operation of the device in a large dynamic range is ensured by SA 3, 4, 8 and 9, which are configured so that signals below 40 dB from source 1 pass mainly through filters 6 and 12. Signals that exceed 40 dB pass from source 1 to receiver 14, mostly mine 6 and 12 filters. 2 ill.

Description

The invention relates to radio engineering and communication and can be used in the transmission and reception systems of both analog and discrete signals over communication channels with additive and multiplicative interference. The purpose of the invention is to improve the reception accuracy by expanding the dynamic range of the transmitted signals.

FIG. 1 shows the structural electrical circuit of the device for transmitting and receiving signals in FIG. 2 - attenuation characteristics of controlled attenuators.

The device contains on the transmitting side a signal source 1, a first block 2 of the selection of the signal envelope, the first 3 and second 4 controlled attenuators, the first block 5 of the delay, predistortion filter 6 and the first adder 7, and on the receiving side the third 8 and fourth 9 controlled attenuators, the second block 10 in the allocation of the signal envelope, the second block 11 of the delay correction filter 12 the second adder 13 and the receiver 14 signals.

Device for transmitting and receiving

The signals works as follows. I

At the heart of the device based on the following principle. The transmitted signals are predistorted and correct only at a relatively small level, and the large signals do not need to be predistorted and corrected, since they have a fairly good signal-to-interference ratio without additional processing and reception and reception.

From source 1, the signal is fed to the main | inputs of the first 3 and second 4 controlled attenuators, and to the input of the first block 2. The output signal of the first block 2 is fed to the control inputs of the first 3 and second 4 attenuators and controls the magnitude of their attenuation. Attenuation dependence b. and b - the first 3 and second 4 controlled attenuators and their total value, + the magnitude of the control signal is shown in FIG. 2. The magnitude of the control signal at the output of the first block 2 is proportional to the level of the signal taken from source 1. When the signal is low at the output of source 1, the control signal at the output of the first block

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2 also takes on a small value. In this case, the attenuation b, of the first controlled attenuator 3 is maximum, and the attenuation b of the second controlled attenuator 4 is minimal (figure 2). The signal from source 1 passes practically without attenuation through the second controlled attenuator 4 to the predistortion filter 6 and through the first adder 7 to the communication channel. With an increase in the signal level at the output of source 1, the value of the control signal at the output of the first block 2 increases, the attenuation of the first 3 and second 4 controlled attenuators in this case is redistributed according to their characteristics (Fig. 2) so that the first controlled attenuator} low attenuation b, and attenuation b of the second controlled attenuator 4 approaches its maximum value. Now the signal from the source 1 to the communication channel passes with a small attenuation through the first controlled attenuator 3, the first block 5 and the first sum Matrix 7. As a result, at the output of the first adder 7, a signal is received that is practically not subjected to distortion.

The first block 5 provides the same delay of the corresponding spectral components as the predistortion filter 6.

The attenuation characteristics b and b of the first 3 and second 4 controlled attenuators are reciprocal, and their sum b is a constant value and does not depend on the value of the control signal. Due to this, the signal level at the output of the first adder 7 is determined only by the value of the signal at the output of source 1.

The state of the third 8 and fourth 9 controlled attenuators is determined by the signal received at their control inputs from the second unit 10. From the third controlled attenuator 8 through the second block 11, and from the fourth controlled attenuator 9 through a correction filter 12 signals are fed to the inputs of the second adder 13, and from its output to the receiver 14 and to the second. block 10,

Predistortion filter 6 together with a correction filter 12 provide increased noise immunity

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information transmission systems for relatively low level signals. The system’s operation in a large dynamic range is ensured by the first 3, second 4, third 8 and fourth 9 controlled attenuators, which are configured so that signals below 40 dB from source 1 pass mainly through predistortion and correction filters 6 and 12, and signals the level of which exceeds 40 dB passes from source 1 to receiver 14, mainly mine predistortion and correction filters.

Claims (1)

Invention Formula A device for transmitting and receiving signals, containing a signal source and a predistortion filter on the transmitting side, and a correction filter and a receiver on the receiving side, which, in order to improve the reception accuracy by expanding the dynamic range of transmitted signals, on the transmitting side. On the side, the first block of the signal envelope is entered, the first and second controlled attenuators, the first delay block and the adder, the output of which is five 942266 The signal point is connected to the combined inputs of the first and second controlled attenuators and the first block of the envelope of the signal, the output of which is connected to the combined control inputs of the first and second controlled attenuators, the output of the first of which is connected to the first input of the first adder via the first delay block, the second input of which is connected to the output of the second controlled attenuator through the predistortion filter, and the third and fourth controlled attenuators are introduced at the receiving side, the second delay unit and a second envelope selection unit and a second adder, the output of which is connected to the combined inputs of the signal receiver and the second selection section of the signal envelope, the output of which is connected to the combined control inputs of the third and fourth controlled attenuators, the inputs of which are combined, the output of the third controlled attenuator through the second delay unit connected to the first input of the second adder, the second input of which through a correction filter connected to the output of the fourth controlled attenuator. 0 0 v.b W20Uynp.